hrsg operating man

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Projects and Customers Information:

Fujairah 2 Project Company

Additional Project Information

Project name: Fujairah II Country UAERevision HistoryRev. Revision/Date Created by Checked by Approved by Description

B 18/07/2008 Varatharaj N.Gobi MAXY Initial Issue

C 23/10/2008 Varatharaj N.Gobi N.Gobi Burner operating proce-dure generally revised

D 20/02/2009 Varatharaj N.Gobi N.Gobi Generally Revised

Scale Project Document Coding

FUJ/00/M/H------A30/OI/006 Rev.DResponsible dept.

EHGCreated by

VaratharajChecked by

N.GobiApproved by

AJRFormat

WordDocument Type

Selection SheetDocument Status

Electronically ReleasedOriginator Identification number

FUJ/00/M/H------A30/OI/006 Rev.D

Client

abcdPower Turbo-Systems

Title, Subtitle

OPERATING PROCEDURE Rev.D

Date

20-02-2009Lang.

ENSheet

1 of 49

abcdEHG ALSTOM Project India Limited

Document Number PB0048-19.02

THIS DOCUMENT IS THE PROPERTY OF ALSTOM PROJECTS INDIA LIMITED AND IS ONLY ALLOWED TO BE USED BYEXPRESS PERMISSION & LICENCE FROM ALSTOM PROJECTS INDIA LIMITED

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ALSTOM Projects India Ltd. Item No.: 19.02Contract Name: Fujairah II Rev. No.: DContract No.: PB0048 Date: 20 Feb 09

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OPERATING PROCEDURE

TABLE OF CONTENTS

TITLE PAGE NO.

INTRODUCTION .......................................................................................................................... 4

COMPLETION OF MAINTENANCE PRIOR TO OPERATION.................................................... 4

INITIAL FILLING .......................................................................................................................... 4

HP FILLING.................................................................................................................................. 5

PRE-OPERATIONAL EQUIPMENT CHECKS............................................................................. 6

START-UP FROM A COLD CONDITION .................................................................................... 6

START-UP FROM A WARM / HOT CONDITION........................................................................ 8

SUPPLEMENTARY FIRING SYSTEM....................................................................................... 10

SECURING TO A WARM LAY-UP CONDITION ....................................................................... 11

SECURING TO DRAIN (WITHOUT NITROGEN BLANKETING).............................................. 11

CONTROLS AND INSTRUMENTATION ................................................................................... 12

Controls ..................................................................................................................................... 12

Instrumentation ........................................................................................................................ 12

SAFETY VALVES ...................................................................................................................... 12

EMERGENCY PROCEDURES .................................................................................................. 14

High Water Level ...................................................................................................................... 14

Low Water Level ....................................................................................................................... 15

Tube Failure .............................................................................................................................. 15

Loss of Feedwater Supply ....................................................................................................... 15

SUPPLEMENTARY FIRING SYSTEM OPERATING PRINCIPLES.22

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TABLES:Table 1 - Valve Alignment: High Pressure Section

Table 2 - HP Drum Level Setpoints

ENGINEERING DRAWINGS:

Piping & Instrumentation Diagram

Legend Sheet..... FUJ/00/M/H A30/FD/001

HP System .............................................................................. FUJ/00/M/H A30/FD/002

Blowdown Tank...................................................................... FUJ/00/M/H A30/FD/003

Gas Side.................................................................................. FUJ/00/M/H A30/FD/004

Burner Head Valve Train and Burner Head ......................... FUJ/00/M/H A30/FD/005

Diesel Oil Pumping set .......................................................... FUJ/00/M/H A30/FD/006

Cooling air skid and Fuel main valve trains ........................ FUJ/00/M/H A30/FD/007

Instrument , service air & Nitrogen system FUJ/00/M/H A30/FD/041

REFERENCE DOCUMENTS:

FUJ/00/M/H ..A30/LV/001 - Valve ListFUJ/00/M/H A30/LI/001 - Instrument Lis t

FUJ/00/M/H A30/OI/006 - Operating ProceduresFUJ/01/B/H..A30/EI/004 Input Data for Functional and Logic Diagrams

FUJ/00/M/H A30/OI/001 Start -Up and Shut down curves

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INTRODUCTION

These procedures are intended to serve as a guide during the initial operatingstages of a Heat Recovery Steam Generator (HRSG). They include the properoperating sequences for the steam generator and auxiliary equipment furnishedby ALSTOM Projects India Ltd. Refer to the Piping and Instrumentation Dia-grams. The sequential procedures do not include detailed reference to equip-ment not furnished by ALSTOM Projects India Ltd, such as the feed pumps, orthe gas turbine.

Because the steam generator is only one part of the power plant, and all equip-ment must operate in unison, specific procedures and detailed values cannot beincluded in this manual. As operating experience is gained and the controls arefine-tuned, the characteristics and operating requirements of the unit will become

apparent.Refer to manufacturer's instructions for further operating details for specificequipment supplied by ALSTOM Projects India Ltd.

COMPLETION OF

MAINTENANCE PRIOR TO

OPERATIONCheck the HRSG to make sure that all maintenance work has been completed,all tools and debris have been removed, the hand hole plates and manhole cov-ers have been installed and secured, and all access doors have been installedand secured.

Check the safety valves to see that the gags have been removed, the lifting lev-ers have been replaced, and the valves are not fouled or hung up. In addition,check to ensure that the steam and feed water isolation valves are operationalready to open according to procedures, drain and vent valves are all operationalready to be preset according to procedures and as listed in the appropriate valvealignment list.

Ensure all the components were installed after acid cleaning

The operator should understand the start up and shut down curves (PB0048-01.04) prior to operating the HRSG.

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INITIAL FILLINGThis section describes the recommended procedure for fiIIing an empty HRSGwith water.

If the unit is hot, filling of a pressure level system with cold water should not beinitiated until the drum metal temperature for that pressure level has cooled to

within 56C (100F) of the incoming feedwater temperature. Filling should bedone slowly, with the feedwater 30% control valve at 10%open, to avoid severetemperature strains. Otherwise, damage may result due to relatively cool watercoming into contact with heated pressure parts.

Also, since deposits of solids in a superheater can cause corrosion or inhibit heattransfer, introduction of solids by carryover of boiler water from the drum duringfilling, hydrostatic testing or chemical cleaning must be avoided.

Proceed as follows:

1. Prepare HP Feed water Pumps and plant feed piping for start-up.

2. Align all HRSG valves as shown under the column labeled START FROMCOLD on Tables 1.

3. Make sure all drain valves are closed.

4. Before starting the HP Feed water Pumps used in initial filling operation, feedsystem control valve station should be positioned to allow for filling of theboiler, including the following (Refer to Piping and Instrumentation Diagrams):

a. Close HP Feedwater Stop Valve (LAB96 AA051).

b. Open the HP Feedwater Bypass Fill Valve (LAB96 AA061) to allow forfilling.

c. Open the HP Feedwater Control Valve (30%) (HAC58 AA024) to allowfor filling

HP FILLING5. Start the HP Feedwater Pump used for initial filling operations and open

(approximately 1/4 turns) the HP Drum Outlet Vent Valves (HAD52 AA201,HAD52 AA202), the HP Economizer Vent Valves (HAC53 AA201, HAC53

AA202, HAC53 AA211, HAC53 AA212, HAC53 AA221, HAC53 AA222 HAC53AA231, HAC53 AA232, HAC53 AA261, HAC53 AA262, HAC54 AA211,HAC54 AA212, HAC54 AA221, HAC54 AA222, HAC54 AA231, HAC54

AA232, HAC54 AA201, HAC54 AA202, HAC55 AA211, HAC55 AA212,HAC55 AA221, HAC55 AA222, HAC55 AA231, HAC55 AA232, HAC55

AA201, HAC55 AA202, HAC56 AA211, HAC56 AA212, HAC56 AA221,HAC56 AA222, HAC56 AA231, HAC56 AA232, HAC56 AA201, HAC56

AA202, HAC57 AA211, HAC57 AA212, HAC57 AA221, HAC57 AA222,HAC57 AA231, HAC57 AA232, HAC57 AA201, HAC57 AA202,HAC58 AA201, HAC58 AA202, HAC58 AA211, HAC58 AA212)and Feed Water Heater Vent valves ( HAC10 AA201, AA202,

AA203, AA204,AA208,AA209,AA210,AA211,AA212,AA213,AA214,AA215).

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6. Fill the HP Economizer and HP Evaporator until the Cold Start-up NWL hasbeen cleared in the HP Drum (see Table 2 for Drum Levels). DO NOT

OVERFILL THE DRUMS. Close the HP Economizer Vent Valves for eachsection when all air has been displaced from that section. Close the HP DrumOutlet Vent Valves when the HP Drum fill is complete.

7. After the drum fill is complete close HP Feedwater Control Valve (HAC58AA024). Place all feed system control valve stations including associateddrum level controls in AUTO MODE.

All condensate / feed water pumps can be temporarily off-line while waiting forpre-operation equipment checks and valve alignments prior to start-up. TheHRSG is now ready to be started using the procedure for START-UP FROM

A COLD CONDITION.

PRE-OPERATIONAL

EQUIPMENT CHECKSHave all HRSG auxiliary equipment lined up for operation prior to allowing flow ofthe gas turbine exhaust to the HRSG.

Prior to initial operation:

1. Make sure that:

a. All instrument valves should be lined up for service.

b. All drum level transmitter reference legs are filled.

c. All sample line valves should be closed.

d. All chemical and nitrogen feed valves should be closed.

e. All drain valves should be closed.

2. Open and close the following valves to ensure that water level gauges arereading correctly:

a. HP Drum Level Indicator Drains (HAD50 AA243, HAD50 AA244).

b. HP Drum Level Control Unit Drains (HAD50 AA251, HAD50 AA252).

START-UP FROM A COLD

CONDITION

This section describes the recommended procedure for starting the HRSG from acold condition with no pressure in the HP boiler section. Proceed as follows:

1. Purge the HRSG in accordance with NFPA 85 dated 2004, Chapter 8.9.2(Combustion Turbine Exhaust Systems) guidelines.

It is understood that purging is accomplished by using air at ambient tem-peratures. The ambient air temperatures during a normal purge cycle will nothave any damaging effect on any of the HRSG components.

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2. Align all HRSG valves as shown under the column labeled START FROMCOLD on Table 1.

NOTE:Some of the following procedures are redundantto what is shown on Table 1. This is done to emphasizethe importance of performing these procedures.

3. Place the HP Desuperheater Spray Water Control Valve (LAE50 AA005,LAE50 AA002) in AUTO. Place the HP Desuperheater Spraywater PowerBlock Valve (LAE50 AA024, LAE50 AA001) in AUTO.

NOTE:Although desuperheating is not required exceptat peak turbine load, it is good practice to have the con-trol station available whenever the unit is operating.

4. Open and place the following Drain Valves in AUTO:

a. HP Superheater 1/2 Drain Isolation Valve (HAH52 AA202),

b. HP Superheater 3 Drain Isolation Valve (HAH51 AA202),

Allow any condensate in these sections to drain.

5. Prior to start up, reset the water level set points in the feedwater control sys-tem to ensure that the water levels in the HP Drum is just above the ColdStart-up NWL (see Table 2 for Drum Levels). Use the HP Evaporator (HAD50

AA209) Intermittent Blow-off Isolation Valves as necessary to reduce waterlevels.

6. Close HP Feedwater Stop Valve (LAB96 AA051). Open the HP FeedwaterStop Fill Valve (LAB96 AA061) and open the HP Feedwater 30% ControlValve (HAC58 AA024) to allow for filling of the drum.

7. Open the HP Main Steam Outlet Stop Valve (LBA51 AA001, LBA51AA002#)[Manual Valve] in order to warm up the piping downstream ofALSTOM Projects India Ltd scope.

8. Open the HP Steam Startup Vent Isolation Valve (LBA51 AA211) and HPsteam Startup vent MOV (LBA51 AA212). This vent should be placed inAUTO.

9. If needed, restart condensate / feedwater pumps and ensure that pumps arerunning.

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10. Allow heated gas turbine exhaust flow to enter the HRSG by starting the gasturbine (Flame On).

11. While the steam generator is being brought up to pressure, all cold steampiping should be gradually heated and drained of condensate. The HP SteamStartup Vent Valve (LBA51 AA211, LBA51 AA212) must stay opened to in-sure a positive flow of steam which will reduce thermal expansion.

To warm the piping downstream of ALSTOM Projects India Ltds scope, opena drain or vent downstream of ALSTOM Projects India Ltds scope to allowthe steam from the bypass valve to warm the piping. Ensure that all steampiping downstream of the boiler piping is drained prior to admitting steam.

12. When a measurable HP steam flow is established (approximately 10% of full

flow), the HP steam section is on line and the HP Main Steam Outlet StopValve (LBA51 AA001, LBA51 AA002#)[Manual Valve] may be opened and theHP Startup Vent Valve (LBA51 AA211, LBA51 AA212) may be closed.

NOTE: During startup or steam startup vent operationthe HP systems steam flow can be obtained from theHP Feedwater Flow Transmitters (HAC58 CF001 andHAC58 CF002).

13. The water level set points in the feedwater control system for the HP Drumwill return to the normal operating water level settings automatically whenthe respective system steam flow > 10%.

Flowrates by Pressure Section (kg/s)

Normal unfired Op.Setpoints(Case 6)

Startup Setpoints

Section 100% < 10 %HP 110.66 11.066

14. Open the following continuous blowdown isolation valves:

a. HP Drum Continuous Blowdown Isolation Valve (LCQ61 AA001).

Blow down flow should be controlled with the following valves:

a. HP Drum Continuous Blowdown Metering Valve (LCQ61 AA002).

START-UP FROM A WARM

/ HOT CONDITIONThis section describes the recommended procedure for starting the HRSG from aWarm / Hot condition, which is when the HP Drum Pressure (HAD50 CP003) >1.72 barg (2.74 bara). Proceed as follows:

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1. Purge the HRSG in accordance with NFPA 85 dated 2004, Chapter 8.9.2 (Combus-tion Turbine Exhaust Systems) guidelines.

It is understood that purging is accomplished by using air at ambient tempera-tures. The ambient air temperatures during a normal purge cycle will not haveany damaging effect on any of the HRSG components.

2. Align all HRSG valves as shown under the column labeled START FROMWARM on Table 1.

NOTE:Some of the following procedures are redundantto what is shown on Table 1. This is done to emphasizethe importance of performing these procedures.

3. Place the HP Desuperheater Spray Water Control Valve (LAE50 AA005,LAE50 AA002) in AUTO. Place the HP Desuperheater Spray water PowerBlock Valve (LAE50 AA024, LAE50 AA001) in AUTO.

NOTE:Although desuperheating is not required exceptat peak turbine load, it is good practice to have the con-trol station available whenever the unit is operating.

4. Open and place the following Drain Valves in AUTO:

a. HP Superheater 1/2 Drain Isolation Valve (HAH52 AA202),

b. HP Superheater 3 Drain Isolation Valve (HAH51 AA202),

Allow any condensate in these sections to drain.

5. Prior to start up, reset the water level set points in the feedwater control sys-tem to ensure that the water levels in the HP Drum is just above the ColdStart-up NWL (see Table 2). Use the HP Evaporator (HAD50 AA209) Intermit-tent Blow-off Isolation Valves as necessary to reduce water levels.

6. Open the HP Feedwater Stop Valve (LAB96 AA051).

7. Open the HP Main Steam Outlet Stop Valve (LBA51 AA001, LBA51AA002#)[Manual Valve] in order to warm up the piping downstream ofALSTOM Projects India Ltds scope.

8. Open the HP Steam Startup Vent Isolation Valve (LBA51 AA211) and the HPsteam Startup vent MOV (LBA51 AA212). This vent should be placed in

AUTO.

9. If needed, restart condensate / feedwater pumps and ensure that pumps arerunning.

10. Allow heated gas turbine exhaust flow to enter the HRSG by starting the gasturbine (Flame On).

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11. While the steam generator is being brought up to pressure, all colsteampiping should be gradually heated and drained of condensate. The HP SteamStartup Vent Valves (LBA51 AA211, LBA51 AA212) must stay opened toinsure a positive flow of steam, which will reduce thermal expansion.

To warm the piping downstream of ALSTOM Projects India Ltds scope, opena drain or vent downstream of ALSTOM Projects India Ltds scope to allowthe steam from the bypass valve to warm the piping. Ensure that all steampiping downstream of the boiler piping is drained prior to admitting steam.

12. When a measurable HP steam flow is established (approximately 10% of fullflow), the HP steam section is on line and the HP Main Steam Outlet StopValve (LBA51 AA001, LBA51 AA002*)[Manual Valve] may be opened and theHP Startup Vent Valves (LBA51 AA211, LBA51 AA212) may be closed.

NOTE:During startup or steam startup vent operationthe HP systems steam flow can be obtained from theHP Feedwater Flow Transmitters (HAC58 CF001,HAC58 CF002).

13. The water level set points in the feedwater control system for the HP Drumwill return to the normal operating water level settings automatically whenthe respective system steam flow > 10%.

Flowrates by Pressure Section (kg/s)

Normal Unfired Op.

Setpoints(Case 6)

Startup Setpoints

Section 100% > 10 %HP 110.66 11.066

14. Open the following continuous blowdown isolation valves:

a. HP Drum Continuous Blowdown Isolation Valve (LCQ61 AA001).

Blowdown flow should be controlled with the following valves:

b. HP Drum Continuous Blowdown Metering Valve (LCQ61 AA002).

SUPPLEMENTARY FIRING

SYSTEM

This section describes the recommended procedure for start up and shutdown of the Supplementary Firing system and its auxiliaries. Please refer An-nexure(08.0.0.1436.00, Part 8 Operating Principles) to this document foroperating principles of supplementary firing system.

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SECURING TO A WARM

LAY-UP CONDITION

SECURING TO WARM LAY-UP CONDITION WITHIN 24 HOURS

IMMEDIATELY FOLLOWING THE GAS TURBINE SHUT DOWN.

This section describes the recommended procedure for securing the HRSG to awarm lay-up condition. Proceed as follows:

1. Prevent the gas turbine exhaust flow to the HRSG by shutting down the GasTurbine to the HRSG.

2. Align all HRSG valves as shown under the column labeled SECURE TOWARM on Table 1. In particular, ensure that the following valves areclosed:

a. HP Feed water Stop Valve (LAB96 AA051) and HP FeedwaterFill Valve (LAB96 AA061).

b. HP Main Steam Outlet Stop Valve (LBA50 AA001, LBA50AA002#)[Manual Valve].

c. HP Drum Continuous Blowdown Isolation Valve (LCQ61 AA001).

d. HP Feed Water Preheater Valves (LAA96 AA001,AA002)[Manual Valve].

3. When the HP Drum Pressure (HAD50 CP003) falls below 1.72 barg (2.74bara), the drum pressure may be allowed to decrease to atmospheric pressureby opening the HP Steam Startup Vent Valve (LBA51 AA212) or a nitrogenblanket may be maintained by opening the HP Nitrogen Stop Valve (HAD50

AA702).

SECURING TO DRAIN (WITHOUT

NITROGEN BLANKETING)

This section describes the recommended procedure for securing the HRSG with-out nitrogen blanketing in order to drain the unit prior to performing maintenance.Proceed as follows:

1. Prevent any gas turbine exhaust flow to the HRSG by shutting down the gasturbine.

2. Align all HRSG valves as shown under the column labeled SECURE TO

DRAIN on Tables 1.a. HP Feedwater Stop Valve (LAB96 AA051).

b. HP Main Steam Outlet Stop Valve (LBA51AA001, LBA51AA002#)[Manual Valve].

c. HP Drum Continuous Blowdown Isolation Valve (LCQ61AA001).

d. HP Feed Water Preheater Valves (LAA96 AA001,AA002)[Manual Valve].

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3. When the HP Drum Pressure (HAD50 CP003) falls to 1.72 barg (2.73 bara),open the HP Steam Startup Vent Valve (LBA50 AA212). These main steam

vent valves must be opened before the associated drum pressure falls anylower to prevent a vacuum from developing that may cause leakage of thedrum man way gaskets.

4. When the HP Drum Pressure (HAD50 CP003) falls to 1.03 barg (2.04 bara),open the HP Superheater 1/2 and HP Superheater 3 Drain Isolation Valves(HAH52 AA201, HAH52 AA202, HAH51 AA201, HAH51 AA202). The drumpressure may be allowed to decrease to atmospheric pressure.

5. The HRSG can be drained when it is completely cooled (when vapor no longerescapes from the vents).

6. Open the vent valves and drain valves one heat exchanger section at a time toavoid overloading the drain discharge system downstream of the HRSG.Open the Blowdown Stop Valves if the blowdown lines are to be drained.

CONTROLS AND

INSTRUMENTATION

ControlsIt is beyond the scope of this manual to discuss the design parameters and se-lection criteria of control systems. Instead, we will review the steam generatordynamics involved in tuning these systems and note problems we have found onactual operating units. When we discuss steam generator control, we are actuallyreferring to the drum level controls; all other controls are supplied by others.

The drum level controls will regulate the rate of feedwater flow to maintain aproper drum level throughout the operating range of the steam generator.

To get maximum benefit from a three-element system, feedwater flow should beproportional to steam flow with reset action on drum level. This means thatpounds of feedwater entering should always equal pounds of steam leaving, withperiodic small corrections made to correct deviations from level set points. Thebest drum level control is achieved through mass flow balance.

InstrumentationEven the most sophisticated and well-tuned control systems do not take the

place of the judgment of an alert, motivated and trained operator. The onlymeans that an operator has to make his judgments is through adequate and cali-brated instrumentation.

SAFETY VALVESSafety valves serve to protect pressure vessels from overpressure. On superhea-ter outlets they serve the additional purpose of protecting the superheater fromoverheating in the event of a sudden interruption in steam consumption.

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The total relieving capacity of the safety valves on a boiler cannot be less than the de-sign steaming capacity. It is a Code requirement that one or more safety valves onthe steam drum be set at or below the design pressure of the unit. Any economizer

which can be isolated from the boiler must have its own safety valve. The discharge ca-pacity of any superheater safety valve or valves can be included in the total relieving ca-pacity of the boiler, provided there is no way to isolate the superheater. Valves are to bedesigned to operate without chattering and to obtain full lift at no more than 3% abovetheir set pressure. Valves are to close within 4% of set pressure, but no less than 2% ofset pressure.

The popping point tolerance shall not exceed:

0.14 barg (2 psig) for pressures up to 4.83 barg (70 psig).

3% for pressures up to 20.68 barg (300 psig).

0.69 barg (10 psig) for pressures up to 68.95 barg (1000 psig).

1% for pressures over 68.95 barg (1000 psig).

ALSTOM Projects India Ltd recommends that all safety valves be lifted to checkpopping pressure and blow down prior to annual maintenance outages. Duringthese outages, valves that leaked or had a tendency to simmer or chatter shouldbe disassembled and repaired. During valve testing, it is important to maintaindrum level at or below normal water level to prevent water damage to drum valveseats and to prevent high solids boiler water from being drawn into superheaters.

Any time a valve is disassembled, its seat should be touched up with a lap and1000 grit-lapping compound. If the seat is in poor shape, use a carborundum discfirst, then progressively finer grits.

The following are safety tips and helpful hints:1. Never set safety valves by holding set pressure and lowering the popping

pressure setting with a wrench. This is extremely hazardous. Valve settingchanges should be made with the boiler pressure considerably lower thanset point. After the wrench adjustment is made the lifting gear should bereplaced and boiler pressure should be raised to the new popping point.

2. Ring locking pins can vibrate loose when a valve is relieving. The pinsshould always be wired to each other except when one pin is removed tomake a ring adjustment.

3. Entrained water will cause excessive blowdown on drum valves. Set drumvalves with the drum water level a few inches below normal water level, if

possible.

4. A rule of thumb: Vent pipes should be 50 mm (2 inches) larger in diameterthan the valve discharge pipe.

5. The discharge pipe should extend no more than 350 mm (14 inches) intothe vent pipe from the bottom of the drip pan.

6. A safety valve seat can be damaged by debris and water, which enters the valvebody through the vent pipe. This debris is blown around when the valve lifts. Cover-ing the vent pipe with a plastic bag can eliminate the problem.

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7. It is occasionally necessary to mount a vent pipe rigidly to the dischargeelbow. This should be done only when there is no alternative. Care should

be taken that the vent pipe is cut off square, not on the bias.

8. Do not exceed five pops on a valve. If more pops are required, allow valveto cool before proceeding.

9. Do not make adjustments on first pop. Always evaluate the necessary ad-justment from two pops.

10. When popping a valve, always have the cap and drop lever assembly inplace with a rope affixed. If the valve begins to chatter, it can be manuallypopped before the seating surfaces are damaged.

11. Observe the popping pressure on a suitable gauge mounted in the prox-imity of the valve being tested. A second gauge, preferably a dead weight

gauge, should be used to validate the calibration of the observed gauge.

EMERGENCY

PROCEDURES

High Water LevelAbnormally high water levels should be avoided, as it may lead to carry-overand even priming.

In the event of a high water level, there will be a high drum level alarm. Pro-ceed as follows:

1. Isolate the feedwater supply for the appropriate drum using the HP Fe-edwater Control Valves (HAC58 AA004, HAC58 AA014 and HAC58AA024) and HP Feedwater Stop Valve (LAB96 AA051) as required.

2. Blowdown the appropriate drum until the water level is at the normal level.Use the HP Intermittent Blow-off Isolation Valve (HAD50 AA209) as re-quired. The Intermittent Blow-off Valves may be used when the HRSG isoperating at any pressure in order to reduce the drum water level.

3. Isolate the steam outlet for the appropriate drum using the HP MainSteam Outlet Stop Valve (LBA51 AA001, LBA50 AA002#)[Manual Valve] asrequired. Open Superheater Drain Valves for appropriate drum using HP Su-

perheater Drain Isolation Valves (HAH52 AA202, HAH51 AA202) as appro-priate.

4. If the HIGH HIGH HIGHalarm has not cleared within 2 minutes, initiatetrip of gas turbine.

5. Investigate the water conditions (alkalinity and solids).

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Low Water Level

If the water level falls out of sight in the water gauge, due to failure of the fe-edwater supply or neglect of the operator, appropriate action should be takenat once. The only exception is in the case of momentary fluctuations thatmight occur with extraordinary changes in load. Any decision to continue tooperate, even if only for a short time at a reduced rating, would have to bemade by someone in authority who is thoroughly familiar with the circum-stances that led to the emergency and positively certain that the water levelcan be restored immediately without damaging the boiler. In the absence ofsuch a decision:

1. Isolate the steam outlet for the appropriate drum using the HP MainSteam Outlet Stop Valve (LBA51 AA001, LBA50 AA002#)[Manual Valve]as required.

2. If the condition has not been stabilized and gas turbine trip has been initi-ated, allow HRSG to cool so that it may be inspected for damage if re-quired. After correcting the cause, the unit may be restarted.

CAUTION: Do not attempt to add water until the steamgenerator has cooled down sufficiently to where the

drum metal temperatures are within 56C (100F) of thefeedwater temperature; otherwise, damage may resultdue to relatively cool water coming in contact withheated pressure parts.

Tube Failure1. Immediately secure the gas turbine exhaust flow.

2. Secure unaffected sections of HRSG according to Securing to WarmLay-up Condition instructions.

3. Isolate and drain affected sections of HRSG according to Securing toDrain instructions.

Loss of Feedwater Supply

The loss of feedwater supply is a rare occurrence in a properly maintainedsteam plant. However, loss of the feedwater supply can happen and it is tobe treated as an extreme emergency.

A steady persistent drop in the steam drum level indicates problems with thefeed pump, feed pump recirculation control, steam generator feedwater valvecontrol or a tube leak. By quickly comparing system pressures and flows withdata taken at comparable loads during normal operation, the operatorsshould be able to identify the problem area.

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If feedwater flow is increasing relative to steam flow and the drum waterlevel is still falling, a tube leak can be assumed. Secure the gas turbine ex-

haust flow and proceed with tube failure emergency procedures (see Emer-gency Procedures Tube Failure section for details).

For the HP Drum, an alarm will sound when the drum water goes to the lowlevel. At the low low HP Drum level the gas turbine exhaust flow should besecured.

If the problem is with the feed pump or controls, restrict steam generatorsteam flow to balance the ability of the crippled feedwater system to maintaindrum level.

If it is not possible to stabilize drum levels by reducing load, secure the gasturbine exhaust flow and bottle up the steam generator, keeping all vents

closed. When the feedwater system is repaired, restart the unit as detailedunder the procedure titled Start-Up From A Warm Condition.

In any case, the first consideration must be the protection of the steam gen-erator pressure parts from operation with low water.

As is true of any emergency situation with a steam plant, events do not al-ways follow an orderly pattern. The procedures above may or may not fit thepattern for every circumstance. The intent is to emphasize what should bedone in order to protect the steam generator and bring the plant back in op-eration as soon as possible.

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Table 1 Valve Alignment: High Pressure Section

VALVE TAG

DESIGNATIONVALVE DESCRIPTION

STARTFROMCOLD

STARTFROMWARM

NORMALOPERATION

SECURETO

WARM

SECURETO

DRAIN

11LAA96 AA001 HP Feed Water Preheater inlet Closed Closed Open Closed Closed

11LAA96 AA002 HP Feed Water Preheater Outlet Closed Closed Open Closed Closed

11LAA96 AA25111LAA96 AA252

HP Feed Water Preheater inletLine Drain Valves

Closed Closed Closed Closed Closed /Open*

11HAC10 AA20111HAC10 AA20211HAC10 AA20311HAC10 AA20411HAC10 AA20811HAC10 AA20911HAC10 AA21011HAC10 AA21111HAC10 AA21211HAC10 AA21311HAC10 AA21411HAC10 AA215

HP Feed Water Preheater VentValves


11HAC10 AA205

11HAC10 AA20611HAC10 AA207

HP Feed Water Preheater Drain

Valves

Closed Closed Closed Closed Closed /

Open*

11LAA96 AA25311LAA96 AA254

HP Feed Water Preheater OutletLine Drain Valves


11LAB96AA051 HP Feedwater Stop Valve Closed /Auto

Closed /Auto

Open / Auto Closed /Auto

Closed /Auto

11LAB96AA061 HP Feedwater Stop BYPASS MOVValve

Open Open Open Open Open

11LAB96AA251

11LAB96AA25211LAB96AA253

11LAB96AA254

HP Feedwater Inlet Drain Valves Closed Closed Closed Closed Closed /

Open*

11HAC53 AA241,11HAC53 AA242,11HAC53 AA251

HP Economizer 6 Drain Valves Closed Closed Closed Closed Closed /Open*

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11HAC53 AA201,11HAC53 AA202,

11HAC53 AA211,11HAC53 AA212,11HAC53 AA221,11HAC53 AA222,11HAC53 AA231,11HAC53 AA232,11HAC53 AA261,11HAC53 AA262

HP Economizer 6 Vent Valves Closed Closed Closed Closed Closed /Open*



11HAC54 AA211,

11HAC54 AA212,11HAC54 AA221,11HAC54 AA222,11HAC54 AA231,11HAC54 AA232,11HAC54 AA201,11HAC54 AA202

HP Economizer 5 Vent Valves Closed Closed Closed Closed Closed /

Open*



11HAC55 AA211,11HAC55 AA212,11HAC55 AA221,

11HAC55 AA222,11HAC55 AA231,11HAC55 AA232,11HAC55 AA201,11HAC55 AA202



HP Economizer 3A/3B DrainValves




HP Economizer 3A/B Vent Valves Closed Closed Closed Closed Closed /Open*



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11HAC58 AA201,11HAC58 AA202,11HAC58 AA211,11HAC58 AA212


11HAC58 AA001,11HAC58 AA011,11HAC58 AA021,11HAC58 AA005,11HAC58 AA015,11HAC58 AA025,11HAC58 AA007

HP Feedwater CV Isolation Valves Open Open Open Open Open

11HAC58 AA261,11HAC58 AA262,11HAC58 AA263,11HAC58 AA26411HAC58 AA265,11HAC58 AA266,

11HAC58 AA267,11HAC58 AA268

HP Feedwater CV Drain Valves Closed Closed Closed Closed Closed

11HAC58AA004,11HAC58AA014,11HAC58AA024

HP Feedwater Control Valve Closed /Auto

Closed /Auto

Auto Closed /Auto

Closed /Auto

11HAC58AA003 HP Feedwater CV Stop Valve Open Open Open Open Open

11LCQ61AA001 HP Drum Continuous BlowdownIsolation MOV Valve

Closed /Auto

Closed /Auto

Open / Auto Closed /Auto

Closed /Auto

11LCQ61AA002 HP Drum Continuous Blowdown

Metering Valve


11HAD50AA201 HP Evaporator Drain IsolationValve

Closed Closed Closed Closed Open

11HAD50AA202 HP Evaporator Drain IsolationValve


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11HAD50AA208 HP Evaporator Intermittent BlowoffValve


11HAD50AA209 HP Evaporator Intermittent BlowoffIsolation Valve

Closed /Auto

Closed /Auto

Closed / Auto Closed /Auto

Closed /Auto

11HAD52AA201,11HAD52AA202

HP Drum Outlet Vent Valves Closed Closed Closed Closed Closed /Open*

11HAD50AA702 HP Nitrogen Feed Stop Valve Closed Closed Closed Closed Closed

11HAH51AA201 HP Superheater 3 Drain IsolationValve


11HAH51AA202 HP Superheater 3 Drain IsolationValve

Closed /Auto

Closed /Auto

Closed / Auto Closed Closed /Open*

11HAH52AA201 HP Superheater 1/2 Drain IsolationValve


11HAH52AA202 HP Superheater 1/2 Drain IsolationValve

Closed /Auto

Closed /Auto


11HAH51AA250,11HAH51AA251

HP Superheater 2/3 Vent Valves Closed Closed Closed Closed Closed /Open*

11LBA51AA211 HP Steam Startup Vent IsolationValve (M)

Closed Closed Closed / Auto Closed /Open**

Closed /Open**

11LBA51AA212 HP Steam Startup Vent MOVValve

Closed /Auto

Closed /Auto

Closed / Auto Closed /Open**

Closed /Open**

11LAE50AA001,

11LAE50AA024

HP Desuperheater SpraywaterPower Block Valve

Closed /Auto

Closed /Auto

Auto Closed Closed

11LAE50 AA201,11LAE50 AA202,11LAE50 AA203,

11LAE50 AA204

HP Desuperheater SpraywaterDrain Valves

Closed Closed Closed Closed Closed

11LAE50 AA003,11LAE50 AA006

HP Desuperheater Spraywater CVIsolation Valves


11LAE50AA002,11LAE50AA005

HP Desuperheater SpraywaterControl Valve

Closed /Auto

Closed /Auto

Auto Closed /Auto

Closed /Auto

11LBA51AA001,11LBA51AA002

HP Steam Outlet Stop Valve Closed Closed Open Closed Closed

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11LBA51AA222 HP DSH Outlet Drain ISV MOV Closed /Auto

Closed /Auto


11LBA51 AA221 HP Steam Outlet Drain Closed Closed Closed Closed Closed

* Open applies to after the drum pressure falls below 0.5 barg (1.51 bara) and HRSG is completelycooled (when vapor no longer escapes from the vents.).

** Open applies to after the drum pressure falls below 1.72 barg (2.74 bara).

#Not Applicable to HRSG-21

Table 2 HP Drum Level Setpoints

Drum Level Setpoints for 1981 mm (78 inch) ID HP Drum

Cold Start-up Setpoints[Pdrum< 1.72 barg (2.73 bara)]

Normal Operating Setpoints[Pdrum> 55.4 barg (56.4bara)]

Level Value Level Value

HHH[MAX3] +330 mm (+13 in) HHH[MAX3] +330 mm (+13 in)

HH[MAX2] +279 mm (+11 in) HH[MAX2] +279 mm (+11 in)

H[MAX1] +228mm (+9 in) H[MAX1] +228mm (+9 in)

NWL -711 mm (-28 in) NWL +102 mm (+4 in)

L[MIN1] -762 mm (-30 in) L[MIN1] -102 mm (-4 in)

LL[MIN2] -813 mm (-32 in) LL[MIN2] -787 mm (-31 in)LLL[MIN3] -864 mm (-34 in) LLL[MIN3] -864 mm (-34 in)

Levels are referenced to drum centerline.

Dimensions are in inches and millimeters.

Drum level setpoints will be determined based on drum pressure. An HP DrumPressure (HAD50 CP003) < 1.72 barg (2.73 bara) will utilize Cold Startup Set-points. An HP Drum Pressure between 1.72 barg (2.73 bara) and 55.4barg(56.4 bara) will utilize a linear function of determining the set points. An HPdrum pressure> 55.4 barg (56.4 bara)will utilize Normal Operating setpoints.

Field tuning of startup setpoints is permissible.

D

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ANNEXURE

SUPPLEMENTARY FIRING SYSTEMOPERATING PRINCIPLES

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FUJAIRAH II O & M MANUALPART 8 - OPERATING PRINCIPLES

Date: 2009/01/12

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GRC DUAL FUEL FIRED INDUCT BURNER

(Refer to the P&I Diagrams N FUJ/00/M/H----A30/FD/005 &

FUJ/00/M/H----A30/FD/007)

1. SUBJECT 3

2. SAFETY DEVICES AND OPERATION SEQUENCES 3

2.1. Safety devices 32.1.1. GT/HRSG main safety devices 32.1.2. Measurement main safety devices 42.1.3. Burner safety devices 4

2.2. purge 72.2.1. HRSG (turbine) PURGE 7

2.2.2.

Duct burner purge 7

2.3. Operator Interface 8

2.4. Cooling air fan sequences (switch-over logic) 9

2.5. AUGMENTING AIR FAN 9

2.6. DIESEL OIL BOOSTER PUMPS sequences (switch-over logic) 10

2.7. Diesel oil sequence 102.7.1. Prior to ignition: 10

2.7.2.

Burner ignition sequence 112.7.3. Burner shut-down sequences 13

2.7.4. Diesel oil gun cleaning sequence 15

2.8. Natural gas sequence 162.8.1. Burner ignition sequence 162.8.2. Shut-Down NG burner head 19

2.9. Automatic change-over sequence 202.9.1. Change-over from natural gas to diesel oil 202.9.2. Change-over from diesel oil to natural gas 21

2.10. Interface between BMS and DCS (hardwired signals) 21

3. BURNER LOAD CONTROL 21

PART 8

OPERATING PRINCIPLES

C O N T E N T S

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1. SUBJECT

This technical instruction specifies the general operating conditions for a dual fuel fired GRC LOW NOx InductBurner installed in an exhaust gas duct, upstream to a Heat Recovery Steam Generator (HRSG). The dual fuelfired GRC LOW NOx Induct Burner consists of twelve (12) "GR" type Burner heads, mounted and firinghorizontally with natural gas (NG) or diesel oil (DO).The operating mode is the post-combustion mode only.

The design code is NFPA 85, 2004 edition.Additional client requirement:The client has requested a remote burner start-up or shut-off from the DCS or from the BMS.

The igniters operate intermittently with each fuel; each igniter flame is detected by its own built-in flame detectionsystem.Each "GR" type burner head flame is detected by 2 (UV) flame scanners both for NG and DO operation.

This document focuses on defining the control and operating principles of the heating equipment, and shouldtherefore be considered as an explanatory basic description for the purposes of design and manufacture ofautomation equipment. It is not an operating manual, and should not be considered as a substitute for theoperating guide of the generator assembly, nor as instructions for commissioning of the generator assembly.

OPERATING PRINCIPLE

Post-combustion modeThe gas turbine and duct burner are in operation.The duct burner increases the temperature of the gas turbine exhaust gas

Except during the light off, the burner is normally in operation with the 12 heads.

2. SAFETY DEVICES AND OPERATION SEQUENCES

2.1. SAFETY DEVICES

Burner ignition and shut-down sequences, and burner protection logic are ensured by a "fail-safe" programmablelogic controller (PLC).

To increase availability, the PLC is fitted with redundant CPU, redundant communication cards, redundancy of

discrete safety I/O cards (except for lamps) , redundant 24VDC power supplies, and each pressure safety device(for DO, NG, cooling air and atomizing steam) is treated by the BMS in a 2 out of 3 voting logic system.

A manual fault reset on the BMS cabinet front faade is needed to allow a new burner ignition sequence after aburner trip.

In the following safety devices description, a "valve position discrepancy" means that the limit switch(es) fitted to

the valve does not indicate the position -digital status- required regarding to the ON/OFF valve control signal.

2.1.1.GT/HRSG main safety devices

The protection logic system is to be made by DCS.

These safety devices shut-down the burner or prevent it from igniting; they are gathered via three logicinformation (in a 2 out of 3 voting logic system):

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o Burner tripThis information must include the following safety devices:

Turbine running with sufficient load

Emergency stop

2.1.2.Measurement main safety devices

The protection logic system is to be made by CCSThe burner trip from the CCS must include the following devices:

DO flow (11HJF10 CF001) or pressure (11HJF10 CP001) transmitters bad signal (only when burners arelightening with DO)

Atomizing steam pressure (11HJM10 CP001 and CP002) transmitters bad signal (only when burners arelightening with DO)

NG flow (11HJG10 CF001), pressure (11HJG10 CP001) or temperature (11HJG10 CT001) transmittersbad signal (only when burners are lightening with NG)

Augmenting air flow (11HJL10 CF001) transmitter bad signal

Cooling air pressure (11HJQ10 CP001) transmitter bad signal

2.1.3.Burner safety devices

The burner protection logic is ensured by the BMS supplied by Fives Pillard.The burner safety devices consist of the following:

2.1.3.1. Ignition main safety devices(refer to the P&I Diagram FUJ/00/M/H----A30/FD/007)

- Ignition gas shut-off valves position discrepancy of the main ignition gas line (11HJA10 CG081 & CG84),- Ignition gas vent valve position discrepancy (11HJA10 CG082/CG083),

- Ignition gas purge valve position discrepancy (11HJA10 CG085),- Loss of ignition gas pressure (11HJA10 CP801) checked after the opening of the ignition gas shut-off valves

(with 2 seconds time delay),- Excess of ignition gas pressure (11HJA10 CP802) checked after the opening of the ignition gas shut-off

valves (with 2 seconds time delay).

These safety devices prevent all igniters and burner heads from igniting (with NG or DO) and generate:

A shut-down of burner heads igniting sequences,

A shut-down of do burner heads cleaning sequences,

An alarm signal if burner heads were firing with GN or DO,

A safety signal if burner heads were on light off sequence.

2.1.3.2. Ignition safety devices for each igniter(refer to the P&I Diagram FUJ/00/M/H----A30/FD/005)

- Ignition gas individual shut-off valve position discrepancy of each igniter (CG081, lines HJA11 to HJA62),- Igniter flame detected before ignition (ionization) (CR001, lines HJA11 to HJA62),- Igniter flame not detected during ignition (ionization): (CR001, lines HJA11 to HJA62),

These safety devices prevent each igniter and associated burner head from igniting and generate:

An igniter shut-down,

A shut-down of DO burner head cleaning sequence,

An alarm signal if burner head was firing with NG or DO.

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2.1.3.3. Diesel oil main safety devices(refer to the P&I Diagram FUJ/00/M/H----A30/FD/007)

-

Loss of DO pressure at the inlet of main DO valve train (with 2 seconds time delay) obtained with a 2 out of 3voting system between 11HJF10 CP801, CP802 and CP803 pressure switches (PSL)- Loss of atomizing steam pressure of the main atomizing line, obtained with a 2 out of 3 voting system

between 11HJM10 CP801, CP802 and CP803 pressure switches (PSL),- Loss of DO pressure downstream to the flow control valve, checked after the opening of the main shut-off

valve (with time delay to be adjusted during commissioning) obtained with a 2 out of 3 voting system between11HJF10 CP804, CP805 and CP806 pressure switches (PSL),

- Excess of DO pressure downstream to the flow control valve, checked after the opening of the main shut-offvalve (with time delay to be adjusted during commissioning) obtained with a 2 out of 3 voting system between11HJF10 CP807, CP808 and CP809 pressure switches (PSH)

- DO flow control valve (11HJF10 AA101)ignition position discrepancy (i.e. the valve is not positioned at itsignition position prior to and during ignition of the first two burner heads) 11HJF10 CG082 ,

- DO accumulator isolating valve (11HJF10 AA152) position discrepancy (i.e. the valve is not closed before

ignition of the 1

st

burner head couple (11HJF10 CG083)NOTE:an alarm signal is generated in case of closure of the valve after ignition of the 1stburner head couple.

- DO main shut-off valve (11HJF10 AA151) position discrepancy, 11HJF10 CG081,- DO flow or DO pressure transmitters bad signal 11HJF10 CF001 or 11HJF10 CP001, safety device

generated in the CCS,- Loss or excess of DO pressure during start-up under pressure control loop (threshold on the pressure

transmitter 11HJF10 CP001, safety device generated in the CCS),- Loss of CCS watchdog,- DO individual burner head shut-off valve closing position discrepancy

Concerning loss of NG safety devices when burner heads are firing with DO:- NG vent valve (11HJG10 AA152) position discrepancy (.i.e. the limit switches fitted to this valve do not

indicate the opening position required when the burner is operated with DO) 11HJG10 CG083 & CG084,-

One NG main shut-off valve (11HJG10 AA151 or AA153) discrepancy (i.e. the limit switches fitted to thisvalve do not indicate the closure position required) 11HJG10 CG082 or CG085.

These safety devices causes a burner shut-down (of the 12 burner heads) if DO was fired, or prevent it fromigniting with DO.

Note 1:These safety devices are not active if the NG manual isolating valve (11HJG10 AA001) is closed

(11HJG10 CG080)

Note 2:Upon condition there is no position discrepancy for NG main shut-off valves (11HJG10 AA151 or AA153)

and vent valve (11HJG10 AA152), one or more NG individual burner head shut-off valve closing position

discrepancy (closure position required) only generates an alarm.

2.1.3.4. Diesel oil safety devices for each burner head

There are 2 groups of safeties:Group 1:

- DO individual burner head shut-off valve (AA151, lines HJF11 to HJF62) opening position discrepancy(CG081, lines HHF11 to HHF62).

- Flame detected before ignition (CR001 or CR002 lines HJQ11 to HJQ62).- Flame not detected after ignition (CR001 and CR002 lines HJQ11 to HJQ62).

Group 2 :- Atomizing steam individual burner head manual valve (AA001 line HJM11 to HJM62) position discrepancy

(CG081, lines HJM11 to HJM62).

- Atomizing steam individual burner head automatic shut-off valve (AA151 line HJM11 to HJM62) positiondiscrepancy (CG082, lines HJM11 to HJM62).

- Cleaning individual burner head shut-off valve (AA152 line HJM11 to HJM62) position discrepancy (CG083,lines HJM11 to HJM62).

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These 2 groups of safeties devices cause a shutdown of each considered head during DO firing, or prevent itfrom igniting with DO.Group 1 prevents to start the 1

stcouple heads and reset purge if problems occurred when purging or after

purging.

2.1.3.5. Natural gas main safety devices

- Loss of NG pressure at the inlet of main NG valve train (with 2 seconds time delay) obtained with a 2 out of 3voting system between HJG10 CP801, CP802 and CP803 pressure switches (PSLL),

- Loss of NG pressure downstream to the flow control valve, checked after the opening of the main shut-offvalves (with time delay to be adjusted during commissioning) obtained with a 2 out of 3 voting systembetween HJG10 CP804, CP805 and CP806 pressure switches (PSL),

- Excess of NG pressure downstream to the flow control valve checked after the opening of the main shut-offvalves (with time delay to be adjusted during commissioning) obtained with a 2 out of 3 voting systembetween HJG10 CP807, CP808 and CP809 pressure switches (PSH),

- NG main shut-off valves (HJG10 AA151 & 153) position discrepancy for the upstream or downstream shut-off valves (HJG10 CG082 & CG085) limit switches (ZSC),

- NG main vent valve (HJG10 AA152) position discrepancy (HJG10 CG083 & CG084) limit switches (ZSC &ZSO),

- NG manual vent valve(HJG10 AA501) position discrepancy (HJG10 CG081) limit switch (ZSC),- NG purge valve (HJG10 AA154) position discrepancy (HJG10 CG087) limit switch (ZSC),- NG flow control valve (HJG10 AA101) position discrepancy (i.e. the valve is not positioned at its ignition

position prior to and during ignition of the first two heads) HJG10 CG086 limit switch (ZSC),- NG flow transmitter HJG10 CF001 bad signal (safety device generated in the CCS),- Loss or excess of NG pressure during start-up under pressure control (threshold on the pressure transmitter

HJG10 CP002, safety device generated in the CCS).- NG individual burner head shut-off valve (AA151, line HJG11 to HJG62) closing position discrepancy

(CG081, line HJG11 to HJG62) limit switches (ZSC).

Concerning loss of DO safety devices when burner heads are firing with NG:- A DO main shut-off valve closing position discrepancies (CG081 line HHF10) causes a burner shut-down (of

all burner heads in operation).- The closing position discrepancy of one or more DO individual shut-off valve prevents the burner from igniting

with NG, generates an alarm signal and causes a burner shut-down (of all burner heads in operation) after atime delay (5 minutes) if the burner was in operation with NG.

These safety devices cause a burner shut-down (of the 12 burner heads) during NG firing, or prevent it fromigniting with NG.

Note :These safety devices are not active if the two DO booster pumps (HJF01 AP001 & AP002) are not

running.

2.1.3.6. Natural gas safety devices for each burner head

- NG individual burner head shut-off valve (AA151 line HJG11 to HJG62) opening position discrepancy(CG081, line HJG11 to HJG62) limit switches (ZSC),

- Flame detected before ignition: CR001 or CR002 line HJQ11 to HJQ62,- Flame not detected after ignition: CR001 and CR002 line HJQ11 to HJQ62,These safety devices cause a shut-down of each considered burner head during NG firing, or prevent it fromigniting with NG.

2.1.3.7. Main safety devices

- Conditions see 2.1.1,- Conditions see 2.1.2,- Emergency shut-down,

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- Loss of instrument air pressure obtained with a 2 out of 3 voting system between HNX10 CP801, CP802 andCP803 (see P&I Diagram No FUJ/00/M/H----A30/FD/007) pressure switches (PSLL),

- Loss of cooling air pressure, obtained with a 2 out of 3 voting system between HJQ10 CP801, CP802 andCP803, line HJQ10 (with time delay to be adjusted during commissioning of the installation) (see P&IDiagram No FUJ/00/M/H----A30/FD/007) pressure switches (PSL).

- Loss of augmenting air pressure, obtained with a 2 out of 3 voting system between HJL10 CP801, CP802and CP803, line HJL10 (with time delay to be adjusted during commissioning of the installation) (see P&IDiagram No FUJ/00/M/H----A30/FD/007) pressure switches (PSL).

These safety devices generate a burner shut-down (12 heads) or prevent it from igniting (with NGor DO).

AFTER EACH SHUT DOWN CAUSED BY A SAFETY, THE BURNERS NEED TO BE ACKNOWLEDGED(ON BMS PANEL OR BURNER LOCAL CONTROL BOX) AND RESTART LOCALLY.IT IS IMPOSSIBLE TO START A TRIPPED BURNER FROM THE DCS.

2.2. PURGE

2.2.1.HRSG (turbine) PURGE

The HRSG purge sequence makes sure that the exhaust gas path of the process is free from gaseous orsuspended flammable matter prior to turbine ignition.

Purge conditions of the HRSG are performed by the DCS.The turbine purge is made to ensure at least five (5) volume changes of the HRSG enclosure (total volume of thephysical boundary of ductwork from the inlet of turbine to portion of the HRSG where the combustion turbineexhaust gas temperature is reduce to at least 56C below the lowest auto ignition temperature of the gas.

The augmenting air plenum and associated ductwork shall also be purge into the HRSG enclosure.Prior to make the turbine purge, the operator must manually start the cooling air fan system.As the cooling air flow through the augmenting air plenum is up to 25% of the full flow of the augmenting air, theBMS end to the DCS "GT purge permissive". At this moment, the DCS can start the turbine purge.A burner purge shall be accomplished before each 1

stburner head couple ignition.

The burner purge control is made by the BMS. Information HRSG purge completed is send from the BMS tothe DCS to confirm that the burner purge has been realized according to NFPA 852004requirements and to allow aburner start.

2.2.2.Duct burner purge

The burner purge sequence makes sure that the exhaust gas path of the process is free from gaseous or

suspended flammable matter prior to burner ignition.

Purge may be performed once the safety devices and checks listed in . 2.1 have been carried out.The purge conditions of the duct burner are performed by the GT. The gas turbine must therefore be operating atinsufficient load to ensure that the TEG rate is sufficient for adequate purging (combustion turbine exhaust gas atnot less then 25% of full load mass flow rate).The burner purge is made to ensure at least eight (8) volume changes of the HRSG enclosure (total volume ofthe physical boundary of ductwork downstream of burner + all steam generator pressure parts + flue gas pathdownstream of HRSG to stack inlet).The augmenting air plenum and associated ductwork shall also be purge into the HRSG enclosure.As the cooling air flow through the augmenting air plenum is up to 25% of the full flow of the augmenting air, theBMS send to the DCS "GT purge permissive". At this moment, the DCS can start the turbine purge.A burner purge shall be accomplished before each 1

stburner head couple ignition.

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The burner purge control is made by the BMS. Information HRSG purge completed is send from the BMS tothe DCS to confirm that the burner purge has been realized according to NFPA 852004requirements and to allow aburner start.

2.3. OPERATOR INTERFACE

The operator has, on the front door of the BMS cubicle(located into the air conditioned container) the followingitems to start the sequences:

1 Emergency shut-down push button

1 push button "Failure reset"

1 push button "Lamp test"

1 push button "Horn reset"

1 illuminated push button "DO selection"

1 illuminated push button "NG selection"

1 three positions switch (with key) "BMS/Local/DCS"

1 Human Machine Interface (H.M.I.)

1 lamp "400 VAC power on"

1 lamp "230 VAC UPS 1 power on"

1 lamp "230 VAC UPS 2 power on"

1 lamp "110 VDC UPS power on"

1 lamp "24 VDC UPS power on Emergency stop"

1 lamp "24 VDC UPS power on BMS"

1 lamp "24 VDC UPS power on CCS"

1 lamp "Igniter fault"

1 lamp "Alarm"

1 lamp "Main flame fault"

1 lamp "Main failure"

1 lamp "Ignition gas valves discrepancy"

1 lamp "Ignition gas pressure fault" 1 lamp "cooling air system fault"

1 lamp "augmenting air fault"

1 alarm and safety horn

For DO sequences:- 1 illuminated push button "Diesel oil burner stop "- 1 illuminated push button "Diesel oil burner start-up"- 1 lamp "Atomizing, cleaning, DO shut-off valves discrepancy"- 1 lamp "DO pressure fault"

For the NG sequences:

- 1 illuminated push button "Natural gas burner stop "- 1 illuminated push button " Natural gas burner start-up"- 1 lamp "NG shut-off valves discrepancy"- 1 lamp "NG pressure fault"

For CCS :- 1 10" touch panel

Note 2:Twelve local control boxes are also provided to allow local start, stop, cleaning sequences of each burner head.

Each local control box is fitted with:

1 push button "priority stop"

1 push button "Burner head start-up" 1 push button "Burner head stop"

1 push button "Burner head start-up cleaning sequence"

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1 push button "Lamp test"

1 lamp "Burner head in operation with NG"

1 lamp "Burner head in operation with DO"

1 lamp "Ready to start"

1 lamp "Burner head cleaning sequence in progress"

1 lamp "Igniter in operation"

Note 1: the fuel is selected with the two illuminated push buttons "Diesel oil selection" or "Natural gas selection"on the BMS cubicle.

Note 2:Lamps and push buttons on the BMS cubicle are provided to allow the burner start-up in case of a H.M.I.failure.

2.4. COOLING AIR FAN SEQUENCES (SWITCH-OVER LOGIC)

The operator has, on the HMI dedicated to the BMS , the following items to start the cooling air fan sequences:

1 two position switch "Maintenance/Backup"And for each fan:

1 Push button "Start fan"

1 Push button "Stop fan"

1 Lamp "Fan ON"

1 Lamp "Fan Fault"

Before transfer of TEG through the duct, the operator must check that all manual isolating valves on cooling airlines are open and must start-up one cooling air fan to protect burner heads, burner igniters, and flame scanners.

When "Backup" mode is selected (which corresponds to the normal operation mode), one fan can be startedmanually by the operator with the "Start fan" push button (if "BMS" or "LOCAL" is selected with the three positionswitch on the BMS cubicle) or the fan no1 automatically from the BMS (when information "GT running" isreceived from the DCS with "DCS" selected on the BMS cubicle).In case of fan deficiency (electrical motor fault, loss of start response, loss of cooling air pressure, excess ofwrapping temperature, excess of bearing temperature) an alarm signal is generated and the second fan isautomatically started by the sequence.

When "Maintenance" mode is selected (on the BMS cubicle) regardless the choice "BMS" or "DCS", each fancan be started and stopped manually by the operator and not automatically by the sequence.

2.5. AUGMENTING AIR FANThe operator has, on the HMI dedicated to the BMS, the following items to start the augmenting air fan:

1 two position switch "Maintenance/Backup"

1 Push button "Start fan"

1 Push button "Stop fan"

1 Lamp "Fan ON"

1 Lamp "Fan Fault"

Before the burner light of, the operator must check that all manual isolating valves on augmenting air lines areopen and must start-up augmenting air fan.

When "Backup" mode is selected (which corresponds to the normal operation mode) the augmenting fan is

automatically start from the BMS when information "Burner start" is received from the DCS with "DCS" selectedon the BMS cubicle or when the operator start the burner from local panel with "Local" selected.

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When "Maintenance" mode is selected, regardless the choice "BMS" or "DCS", the fan is started and stoppedmanually by the operator and not automatically by the sequence.

2.6. DIESEL OIL BOOSTER PUMPS SEQUENCES (SWITCH-OVER LOGIC)

The operator has, on the HMI dedicated to the BMS, the following items to start the cooling air fan sequences:

1 two position switch "Maintenance/Backup"

1 two position switch "pump selection"And for each pump:

1 Push button "Start pump"

1 Push button "Stop pump"

1 Lamp "pump ON"

1 Lamp "pump Fault"

Before the burner light of with DO, the operator must check that all manual isolating valves on fuel oil lines areopen and must start-up one booster pump

When "Backup" mode is selected (which corresponds to the normal operation mode), the selected pump isautomatically started from the BMS when information "Burner start" is received from the DCS with "DCS"selected on the BMS cubicle or when the operator start the burner from local panel with "Local" selected.In case of pump deficiency (electrical motor fault, loss of start response, loss of DO feeder pump low pressure,loss of DO downstream low pressure ) an alarm signal is generated and the second pump is automaticallystarted by the sequence.

When "Maintenance" mode is selected (on the BMS cubicle) regardless the choice "BMS" or "DCS", each pumpcan be started and stopped manually by the operator and not automatically by the sequence.

2.7. DIESEL OIL SEQUENCE

When the GT is running and a burner head is not in operation, to prevent oil gun atomizing sets overheating thatwould cause their damage, the burner gun is cooled with steam through the DO automatic cleaning valve (valveAA152 line HJM11 to HJM62).

2.7.1.Prior to ignition:

- the operator must first check that:

All manual isolating valves on diesel oil, instrument air, steam line and cooling air lines are open,

All flexible hoses are correctly connected.

All DO guns are installed

All atomizing sets are installed- "Diesel oil" operation must be selected with the associated illuminated push button, on the BMS cubicle.

Note:

If the dummy atomizing tips are not installed in the burner heads before boiler start-up: all burner headsshould be started-up in a reasonable time.

If the dummy atomizing tips are installed in the burner heads before boiler start-up: each atomizing setshould be installed in lieu of the dummy atomizing tip just before starting-up the burner heads.

After a burner head shut-down (voluntary or by fault) the burner should be re-started quickly or theatomizing set replaced by a dummy atomizing tip.

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2.7.2.Burner ignition sequence

DO valves train particularity (see P&I Diagrams No FUJ/00/M/H----A30/FD/005 & FUJ/00/M/H----A30/FD/007):The main DO valves train is supplied with 1 flow control valve (HJF10 AA101), 1 ignition pressure transmitter(HJF10 CP001) and 1 flow transmitter (HJF10 CF001), line HJF10.Each burner head piping is fitted with 1 DO shut-off valve (XSV AA151, lines HJF11 to HJF62), 1 atomizing shut-off valve (XSV AA151, lines HJM11 to HJM62) and 1 cleaning shut-off valve (XSV AA152, lines HJM11 toHJM62), allowing independent operation of each burner head.The atomizing/purging piping is fitted with 2 pressure transmitter (HJM10 CP001 & CP002) and 1 pressurecontrol valve (HJM10 AA101).

Local start-up:According to NFPA 85, 2004, "The start-up of the burner as a first-time function shall be accomplishedby the operator at the burner location who has a direct view of the burner.

So FIVES-PILLARD recommends that after a complete burner shut-down, first start-up for each couple of burnerhead (not only the first couple of heads) should be done from the local control box by pressing the "Burner headstart-up" push button of one of the two local boxes associated to burner heads.

This recommendation is given for the following reasons:- To make sure that each oil gun is installed in the head,- To verify that there is no leak, in particular between the oil gun and the shut-off valve.

Remote start-up:According to CLIENT request, it is possible to initiate the burner start-up from the BMS or from the DCS bypressing the "DO burner start-up" push button. In such a case, all the couples of burner heads are automaticallystarted-up the one after the other.

The three position switch "BMS/Local/DCS" on the BMS cubicle, enables choice of the operating mode.In local mode, each burner head couple ignition is locally started by the operator from the local boxes. There isno order to manually start each burner heads couple but it is recommended to respect the requested order usedin automatic sequence.The requested start-up order of the burner heads couples (in automatic sequence from the BMS or from theDCS) is the following:- Burner heads couple no XB31/XB32,- Burner heads couple no XB41/XB42,- Burner heads couple no XB21/XB22,- Burner heads couple no XB51/XB52,- Burner heads couple no XB11/XB22.- Burner heads couple no XB61/XB62.

If the TEG characteristics are in accordance with the specified technical parameters for duct burner (mass flowrate, no CO, sufficient O2 content, control is made by the DCS and information "Burner trip" sent to the BMS isON) the automation proceeds with starting ignition, under control of the safety devices, of burner heads nXB31and XB32.The lamp "Ready to start" of each burner head local panel is ON when safety devices and checks listed in . 2.1and 2.2 have been carried out.

The "Burner head in operation with DO" lamp of the associated local boxes flashes during ignition and the burnerheads status is indicated on the H.M.I. in front of the BMS cabinet.During ignition of the two first burner heads, the DO flow control valve HJF10-AA101 and the atomizing pressurecontrol valve HJM10-AA101 are forced on their ignition position.

T0 - Opening of upstream + downstream ignition gas shut-off valves HJA10-AA151 and AA153

- Closure of ignition gas vent valve HJA10-AA152- Opening of ignition gas purge valve HJA10-AA154

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T0 + 4'' - Energizing of ignition transformers HJA31-CE001 and HJA32-CE001- Maintaining open the upstream + downstream ignition gas shut-off valves

HJA10-AA151 and AA153- Maintaining close the ignition gas vent valve HJA10-AA152

- Closure of ignition gas purge valve HJA10-AA154- Opening of the two burner heads ignition gas shut-off valves HAJ31-AA151

and HJA32 AA151

T0 + 10'' - De-energizing of ignition transformers HJA31-CE001 and HJA32-CE001- Maintaining open upstream + downstream + burner heads ignition gas

shut-off valves HJA10-AA151, HJA10-AA153, HJA31-AA151 and HJA32 AA151

- Maintaining closed ignition gas vent and purge valves HJA10-AA152 andHJA10-AA154

- Checking igniter flames by the 2 individual igniter flame ionization detectionHJA31-CR001 and HJA32- CR001

T0 + 16" + vidt - Maintaining open upstream + downstream + burner head ignition gasshut-off valves HJA10-AA151, HJA10-AA153, HJA31-AA151 and HJA32 AA151

- Maintaining closed the ignition gas vent and purge valves HJA10-AA152 andHJA10-AA154

- Opening of the DO main shut-off valve HJF10-AA151- Opening of the two DO burner head shut-off valves HHF31-AA151

and HHF32-AA151- Opening of the two burner head atomizing shut-off valves HJM31-AA151 and

HJM32- AA151- Information "Taking into account of DO flow rate " is sent from BMS to CCS

T0 + 21" + vidt + FuT

- Closure of upstream + downstream + burner head ignition gas shut-off valvesHJA10-AA151, HJA10-AA153, HJA31-AA151 and HJA32 AA151- Opening of ignition gas vent valve HJA10-AA152- Maintaining closed ignition gas purge valve HJA10-AA154- Maintaining open the DO main shut-off valve HJF10-AA151 + DO burner

head shut-off valves HJF31-AA151 and HJF32-AA151- Maintaining open the burner heads atomizing shut-off valves HJM31-AA151

and HJM32- AA151- Checking main flames by individual flame detection HJQ31-CR001 or

HJQ31-CR002 and HJQ32-CR001 or HJQ32-CR002- Maintaining information "Taking into account of DO flow rate" from BMS to CCS

T0 + 27" + vidt + FuT - Ignition of burner heads XB31 and XB32 is completed

- Maintaining information "Taking into account of DO flow rate" from BMS toDCS- DO ignition pressure loop is released in the CCS.

Note 1:

FuT = DO line filling-up time

FuT = 6 second for burner heads re-ignition without cleaning,

FuT = 20 seconds for burner heads re-ignition with cleaning.During the first commissioning of the installation, FuT will be adjusted at the shortest time possible

vidt = steam line purging time

vidT = 0 second after the 1stDO couple ignited,

vidt = 60 seconds for 1stDO couple ignition.

During the first commissioning of the installation, vidt will be adjusted at the shortest time possible

The "Burner head in operation with DO" lamp of the associated local panels flashes during the burner light of andswitches to a permanently lit status when the burner is ignited. The burner head status is indicated on the H.M.I.

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Once ignition of burner heads XB31 and XB32 is completed, the operator (from the local box) or the automaticsequence (initiated from BMS or DCS) proceeds with ignition start-up (under control of the safety devices) of theother burner head couples, respecting the requested order (nXB41/XB42, XB21/XB22,.., XB61/XB62) withequivalent actions on the associated local panels, valves and igniters.

Time between 2 burner heads couples ignition is at least 10 seconds.

Note 2:

During ignition:

If a fault appears during ignition (but main DO shut-off valves remained closed) of at least one burnerhead of the first burner heads couple, the couple is tripped; the fault should be determined andcorrected. The burner light off is not allowed until the lamp "Ready to start" is off. The operator shouldrestart ignition sequence of the burner heads couple, with "Local" mode selected, by pressing the"Burner head start-up" push button on the local panel,

If a fault appears during ignition (but main NG shut-off valves remained closed) of one or two head(s)of a burner heads couple, with at least another head already in operation, only the head(s) faulty is(are) stopped, the fault should be determined and corrected. The operator should restart ignitionsequence of the head(s), with "Local" mode selected, by pressing the "Burner head start-up" push

button on the local panel, after the end of the automatic burner light off sequence.

After ignition:

If a fault appears after ignition (after opening of the main ng shut-off valves) of a burner head, with atleast 2 other head already in operation in pressure control or with at least 8 other head already inoperation in flow control, only the faulty head is stopped, the failure should be determined andcorrected the burner ignition is not allowed until the lamp "ready to start" is off. The operator shouldrestart ignition sequence of the head(s), with "local" mode selected, by pressing the "burner head start-up" push button on the local panel, if the automatic burner light off sequence is ended.

The normal burner operation is obtained with 12 burner heads firing simultaneously with DO or NG.

After ignition of the 12 burner heads is complete or after ignition of 8 burners head and the validation ofthe flow control validation on the CCS HMI, NG flow control can modulate, but with n burner heads inoperation, the maximum load shall be limited to n x 8.33 %.

When 8 burner heads are in operation with the NG flow control loop released, loss of one head initiatesa shut-down sequence of the complete burner.

After ignition of the requested burner heads (8 to12 heads) when NG flow control loop is operational, if one ortwo burner heads stop because of a safety device or of a voluntary shut-down (for maintenance), the DCS shallautomatically reduce the load according to the number of burner heads remaining in service.The NG flow control loop will automatically distribute the load on the heads remaining in service.After determination and correction of the fault, the operator should locally start up the remaining heads.

2.7.3.Burner shut-down sequences

Voluntary shut-down of one burner head:The operator can shut-down each burner head (for maintenance) by pressing the associated "Burner head stop"push-button on the local box. This action has priority regardless the choice "BMS/Local/DCS" given by the threepositions switch on the BMS cubicle.

After each voluntary shut-down of one head, excepted for the last one, the operator should start a cleaningsequence of the associated DO gun (see . 2.7.4) by pressing the "Burner head start-up cleaning sequence"push-button on the local panel.The lamp "Burner cleaning sequence in progress" flashes slowly to inform the operator that the cleaningsequence must be made.

For each head, the shut-off sequence is as follows:- The associated DO and atomizing shut-off valves XSV AA151 lines HJF11 to HJF62 and HJM11 to HJM62

close- The associated local "Burner head in operation with DO" lamp switches off.

For the complete burner:

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The complete voluntary shut-down of the burner can be realized by the operator by pressing the "DO burnerstop" push-button on the BMS panel or from the DCS.

The requested shut-down order of the burner heads couples (in automatic sequence from the BMS or from theDCS, or to be respected by the operator in manual mode) is the following:

- Burner heads couple no XB61/XB62,- Burner heads couple no XB11/XB12,- Burner heads couple no XB51/XB52,- Burner heads couple no XB21/XB22- Burner heads couple no XB41/XB42,- Burner heads couple no XB31/XB32.

After a complete voluntary shut-down of the burner, the BMS automatically proceeds with a cleaning sequence ofall burner heads (see . 2.7.4) excepted of the last one.The time delay between each couple shut-down will be adjusted during the first commissioning in order to allowcomplete cleaning sequence of each burner heads couple before shut-down of the last couple.

The complete shut-off sequence is as follows:

- Each DO burner head (XSV AA151 lines HJF11 to HJF62) and atomizing (XSV AA151 lines HJM11 toHJM62) shut-off valves close,

- The DO main shut-off valve (HJF10- AA151) close,- The DO accumulator isolating valve (HJF10- AA152) close,- The DO flow control valve (HJF10- AA101) forced to its ignition position,- All the local "Burner head in operation with DO" lamps switch off.

Note:- If a general burner start-up occurs (from the BMS or from the DCS) during a complete voluntary shut-down

sequence, the shut-down sequence is automatically stopped and an ignition sequence restarts,

Safety shut-down:After a safety shut-down of the complete burner, the cleaning sequence is forbidden.

In order to clean the DO guns, the operator should determine and correct the fault then should restart ignition ofat least one burner heads couple (after a boiler purge) before starting a cleaning sequence of each head.A safety shut-down produces the same actions as the voluntary shut down.The burner head fault is indicated on the H.M.I.

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2.7.4.Diesel oil gun cleaning sequence

After a voluntary shut-down of the complete burner, a cleaning sequence of each head (excepted of the last one)is made by the BMS, except in the case of:- DO burner head individual shut-off valve discrepancy stops or prevents the cleaning sequence of the

considered head,- Atomizing pressure very low obtained with the 2 out of 3 voting system between PSL CP801, PSL CP802

and PSL CP803, line HJM10 (stops or prevents the cleaning sequence of the heads),- Main safety devices (see . 2.1.3.7, stops or prevents the cleaning sequence of the heads),- Individual igniter safeties (see . 2.1.3.5 and 2.1.3.6) stop or prevent the cleaning sequence of the

considered head.

The "Burner head cleaning sequence in progress" lamp(s) of the associated local panel(s) flash(es) rapidlyduring cleaning sequence and the burner head status is indicated on the H.M.I.

T0 - Opening of upstream + downstream ignition gas shut-off valves HJA10-AA151 andHJA10-AA153

- Closure of ignition gas vent valve HJA10-AA152- Opening of ignition gas purge valve HJA10-AA154

T0 + 4'' - Energizing of burner head ignition transformer HJAxx-CE001- Maintaining open upstream + downstream ignition gas shut off valves HJA10-AA151 and

HJA10-AA153- Maintaining closed ignition gas vent valve HJA10-AA152- Closure of ignition gas purge valve HJA10-AA154- Opening of the burner head ignition gas shut-off valve HJAxx-AA151

T0 + 10'' - De-energizing of burner heads ignition transformer HJAxx-CE001- Maintaining open upstream + downstream ignition gas shut-off valves HJA10-AA151 and

HJA10-AA153

- Maintaining open the burner head(s) ignition gas shut-off valves HJAxx-AA151- Maintaining closed ignition gas vent valve HJA10-AA152- Maintaining closed the ignition gas purge valve HJA10-AA154- Checking igniter flames by the 2 individual igniter flame ionization detection HJAxx-CR001

T0 + 16'' - De-energizing of burner heads ignition transformer HJAxx-CE001- Maintaining open upstream + downstream ignition gas shut-off valves HJA10-AA151 and

HJA10-AA153- Maintaining open the burner head(s) ignition gas shut-off valves HJAxx-AA151- Maintaining closed ignition gas vent valve HJA10-AA152- Maintaining closed the ignition gas purge valve HJA10-AA154- Checking igniter flames by the individual igniter flame ionization detection

HJAxx-CR001

- Opening of individual burner head atomizing shut-off valve HJMxx-AA151- Opening of individual burner head cleaning shut-off valve HJMxx-AA152

T0 + 21'' + CT - Closure of upstream + downstream ignition gas shut-off valves HJA10-AA151 and HJA10-AA153

- Closure of the burner head(s) ignition gas shut-off valve HJAxx-AA151- Opening of ignition gas vent valve HJA10-AA152- Maintaining closed the ignition gas purge valve HJA10-AA154- Closure of individual burner head atomizing shut-off valve HJMxx-AA151- Closure of individual burner head cleaning shut-off valve HJMxx-AA152

Note:

- CT = DO gun cleaning time; CT will be adjusted on site during the first commissioning of theinstallation. CT will be as short as possible though at the same time making sure of an efficientpurging.

- During the cleaning sequence, a starting command from the local panel is priori

hrsg operating man

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