gis 47-101 29 february 2008

GIS 47-101

Glycol Dehydration and Regeneration Skid

Group Instruction for Supply

Document No. GIS 47-101 Applicability Group Date 29 February 2008

BP GROUP ENGINEERING TECHNICAL PRACTICES

29 February 2008 GIS 47-101 Glycol Dehydration and Regeneration Skid

Downloaded Date: 6/17/2008 11:15:06 PM The latest update of this document is located in the BP ETP and Projects Library

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Foreword

This is the first issue of Engineering Technical Practice (ETP) BP GIS 47-101. This document is technically identical to the former GIS 60-351 dated 22-December-2005. This Group Instruction for Supply (GIS) is based on parts of heritage documents from the merged BP companies as follows:

British Petroleum GS-140-1 Glycol Dehydration Unit

Amoco A PE-SMU-00-P Packaged Equipment Skid Mounted Units

Copyright 2008, BP Group. All rights reserved. The information contained in this document is subject to the terms and conditions of the agreement or contract under which the document was supplied to the recipients organization. None of the information contained in this document shall be disclosed outside the recipients own organization without the prior written permission of BP Group, unless the terms of such agreement or contract expressly allow.



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Table of Contents Page Foreword ........................................................................................................................................ 2 1. Scope .................................................................................................................................... 4 2. Normative references............................................................................................................. 4 3. Symbols and abbreviations .................................................................................................... 5 4. HSE ....................................................................................................................................... 5 5. General considerations .......................................................................................................... 6 6. Responsibilities...................................................................................................................... 8 7. Drawings................................................................................................................................ 8 8. Mechanical Design ................................................................................................................ 9

8.1. Contactor .................................................................................................................... 9 8.2. Gas / glycol heat exchanger...................................................................................... 10 8.3. Gas inlet filter / separator .......................................................................................... 10 8.4. Glycol reboiler........................................................................................................... 10 8.5. Stripping gas............................................................................................................. 11 8.6. Re-boiler still column................................................................................................. 12 8.7. Pumps ...................................................................................................................... 12 8.8. Glycol / hydrocarbon separator ................................................................................. 13 8.9. Rich / lean glycol exchangers.................................................................................... 13 8.10. Filters........................................................................................................................ 14 8.11. Piping........................................................................................................................ 15

9. Electrical .............................................................................................................................. 15 10. Instrumentation .................................................................................................................... 16

10.1. General..................................................................................................................... 16 10.2. Control panel ............................................................................................................ 16 10.3. Electric heater controls.............................................................................................. 17

11. Safety systems .................................................................................................................... 18 12. Materials .............................................................................................................................. 19 13. Insulation ............................................................................................................................. 19 14. Structural ............................................................................................................................. 19 15. Painting................................................................................................................................ 19 16. Inspection and testing .......................................................................................................... 20 17. Preparation for shipment...................................................................................................... 21 18. Vendor data requirements.................................................................................................... 22 19. Warranty .............................................................................................................................. 23 20. General requirements for utility packages ............................................................................ 23



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1. Scope

This Group Instruction for Supply gives guidance for the design and construction of Glycol Dehydration and Regeneration skid packages. This document takes into account health, safety and environmental legislation, good design practice, and technical and economic considerations. The design information included herein is not intended to cover complete details.

2. Normative references

The following normative documents contain information that, through reference in this text, constitute requirements of this technical practice. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this technical practice are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.

American Petroleum Institute (API) API-RP 2 FPS Practice for Design of Floating Production Facilities API-RP 520 ISA Instrumentation Standards & Data Sheet API-RP-E Piping Design and Installation for Offshore Production Platforms API RP C Safety Systems for Off-shore Production Platforms

BP Group GP 4-20 Civil Engineering GP 4-50 Marine & Coastal Structures-jetties, dredging, breakwaters GP 6-60 Onshore and Offshore Paints and Coatings GP 12-15 Wire and Cable GP 12-20 Motors GP 12-25 Earthing / Grounding GP 12-30 Lighting Small Power GP 12-45 Guidance on Practice for Electrical for Packaged Systems GIS 12-201 Low Voltage Motors (IEC) GIS 12-202 Low Voltage Motors (NEMA) GP 18-01 General Requirements for Welded Fabrication GP 30-25 Field Instruments GP 30-35 Control Valves and Pressure Regulators GP-30-70 Control and Instrumentation on Vendor Packaged Equipment GIS 30-402 Guidance on Industry Standard for Programmable Logic Controllers

(PLC) Procurement GP 32-10 I&T of New Equipment in manufacture GP 32-20 Site Inspection, Testing, and Pre-commissioning GP 32-50 Inspection and Testing of Electrical (ANSI) GP 32-51 Inspection and Testing of Electrical (IEC) GP 34-00 Machinery GP 36-10 Guidance on Practice for Engineering Guidance on Materials Selection GP 40-10 Structural Skids and Skid Mounted Units GP 42-10 Metallic Piping Systems



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GP 44-70 Guidance on Practice for Overpressure Protection Systems GIS-46-01 Pressure Vessels GP 52-10 Guidance on Practice for Thermal Insulation GP 60-50 Guidance on Practice for General Issues Equipment Packages

National Fire Protection Association (NFPA) NFPA 70 National Electrical Codes NFPA 493 Standard for Intrinsically Safe Apparatus in Hazardous Locations. NFPA-496 Enclosures for Electrical Equipment

National Electrical Manufacturers Association (NEMA) 250 Standards for electrical equipment enclosures.

Tubular Exchanger Manufacturers Association (TEMA) Standards for tubular exchangers.

3. Symbols and abbreviations

For the purpose of this GIS, the following symbols and abbreviations apply:

Barg Bar Gauge (Pressure)

BTU British Thermal Unit

C Centigrade

CFR Code of Federal Regulations

F Fahrenheit

FOI Floating Offshore Installation

Gal. Gallon

MCC Motor Control Centre

MMscf Million Standard Cubic Feet

PSIG Pounds per Square Inch Gauge (Pressure)

SCF Standard Cubic Feet

TEG Tri Ethylene Glycol

VAC Voltage Alternating Current

4. HSE

a. Actions shall be taken to incorporate in the design of this equipment, the equipment necessary to minimize personnel exposure to prevent contact with Tri-Ethylene Glycol (TEG).



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b. Appropriate action shall be taken to avoid the loss of glycol due to leakage to the environment.

c. Precautions shall be taken to ensure only essential and properly trained personnel equipped with the proper personal protective equipment (PPE) are allowed in areas where glycol is being transferred or being drained from the system.

5. General considerations

a. The Glycol Dehydration Package shall consist of a Glycol Contactor Unit and a Glycol Regeneration Unit.

b. The Glycol Dehydration Unit shall consist of the following equipment: 1. Contactor, 2. Gas/Glycol Exchanger, 3. Gas Inlet Filter/Separator located upstream of the Contactor.

c. The Regeneration Unit shall consist of: 1. Glycol Reboiler (with an internal or a separate surge tank), 2. Reboiler Still Column, 3. Glycol/Hydrocarbon Separator, 4. Glycol Charcoal and Sock Type Filters, 5. Hot Glycol and Cold Glycol Exchangers, 6. Glycol Pumps, 7. Provisions for stripping gas, 8. A Fuel Gas Scrubber for a Fired Reboiler Unit, if requested on the data sheets.

d. Equipment and materials provided under this specification shall be suitable for all specified ambient conditions such as installation in a marine, salt-laden, and corrosive environment.

e. All equipment shall be capable of performing reliably in the designed ambient environment.

Floating structures which support the topsides equipment will react to wind and wave (including hurricane) conditions by exhibiting high movements and accelerations.

f. The Glycol Dehydration and Regeneration Package shall be self-contained with the required accessories ready for operation on connection to electrical, suction, discharge and utility piping.

g. The scope of supply shall include all engineering, labour, materials, procurement, fabrication, supervision, quality control, quality assurance, assembly, painting, testing, preparation for shipment and load out to furnish the equipment items listed for each project.

h. The Glycol Dehydration and Regeneration Package shall be designed and constructed in accordance with all requirements specified.

i. The Glycol Dehydration and Regeneration Package shall be constructed such that each component can be maintained by disassembling only the associated piping, tubing and cable. This shall not disrupt the functionality of any additional equipment or devices associated with the package.



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j. Vessels shall conform to national requirements and local, state, or insurance regulations that apply at the point of usage.

k. Design of this package shall comply with specifications in API-2 FPS, when constructed for use on offshore floating production platforms.

l. All pressure vessels must meet as a minimum the specifications described in BP Guidance on Specification GIS 46-010 Pressure Vessels.

m. All vessels shall be designed, fabricated, tested, inspected and code stamped under the provisions stated in ASME Boiler and Pressure Vessel Code Section VIII, Division I and Section IX.

n. Equipment shall be capable of operating unattended. Circumstances for attended operation shall be specified such as start-up, shutdown, or abnormal conditions.

o. The Dehydration Package shall use Tri Ethylene Glycol (TEG) to absorb water vapour from the wet gas stream.

p. Selection of simple and robust designs, proven equipment and high quality materials having technical integrity and demonstrated safe performance shall be required.

q. Components requiring routine maintenance and operation shall be readily accessible by ladders or access platforms (including viewing of instrumentation and access to valves and switches requiring manual operation) without undue contortion and without the need to remove other components or equipment.

r. Skid shall include drip pans or curbing, as indicated on the data sheets, to contain liquids on the skid.

s. The design information included in this specification is not intended to cover complete details.

t. Where skid dimensions or size limitations are indicated in the supplement, they shall be strictly adhered to.

u. When specified in the project supplement, the equipment shall be designed, structurally and operationally, for motions of the supporting structure during operation, transport, or other condition.

v. The Glycol Dehydration and Regeneration Skid and associated equipment shall comply with the requirements of the Minerals Management Service (MMS) 30 CFR-250 for floating installations in U.S. territorial waters, if the destination facility is classified as a Floating Offshore Installation (FOI).

w. The following information shall be completed where applicable and submitted to BP for review and approval prior to the start of any fabrication: 1. Plan layout, showing access platforms, walkways and clear access areas, 2. Engineering, operating and performance design data and sizing calculations for all

items, 3. Structural drawings and design calculations including lifting either onshore or to an

offshore facility, 4. Vessel, reboiler, filter and exchanger drawings, 5. Assembly piping drawings consisting of, as a minimum, plans, elevations and

sections as required for dimensional elevations of piping and components, 6. Piping and components bill of material.

x. All welding shall be performed in accordance with:



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1. GP 18-01, 2. GP-46-01, 3. Data sheets.

6. Responsibilities

a. The contractor shall furnish equipment in strict accordance with this specification, including all referenced data sheets, specifications, codes, and standards.

b. The contractor shall be responsible for overall design of the equipment, including selection and sizing of all rotating equipment, receiver, membranes, filters, dryers, piping, valves, instrumentation, and controls to satisfy the process and mechanical requirements.

c. The manufacturer, vendor, and contractor shall be responsible for provision of materials, fabrication, testing, and quality of workmanship unless agreed otherwise with BP.

d. The contractor shall be responsible for configuration of the glycol dehydration skid package and shall establish operating levels and temperatures to meet or exceed the design flow and conditions

e. The manufacturer and vendor shall ensure that technical and QA requirements specified in the enquiry and purchase documents are applied to all materials, equipment and services provided by sub-contractor(s).

f. The contractor shall perform all engineering and calculations for the equipment, including all components and appurtenances.

g. No fabrication shall commence until approval drawings have been approved and stamped as Issued for Construction by BP or their designated representative.

h. Issued for Construction drawings shall not relieve the contractor from compliance with codes, specification and safety design.

i. The contractor shall include the cost in his bid of all items required by the specifications. Any proposed exception to the specifications shall be noted in the contractor(s) proposal and the price adder / deduct for the exception shall be included.

j. The contractor shall submit to BP for approval detailed calculations and drawings for the design of the glycol dehydration skid package including all components and appurtenances. The contractor shall include copies of electronic drawing files when submitting final drawings to BP. The contractor shall submit all vendor data in accordance with the supplement to this specification.

k. Where BP has pre-sized equipment, valves, piping, etc., as shown on the data sheets and P&ID's, these sizes shall be considered the minimum sizes required by the process conditions. Contractor shall confirm the sizing and shall be responsible for the design of all components, piping and controls within the scope of supply.

l. The contractor shall resolve all BP comments, incorporate comments on the drawings and re-issue to BP within ten days. BP approval shall be received before commencing fabrication. No subsequent revisions may be issued without BP approval.

m. Approval of any drawings by BP or an inspector does not relieve the manufacturer, vendor, or contractor of any of the above responsibilities.

7. Drawings

The drawings generally shall include the following:



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1. Piping and instrument drawings (P&IDs shall be 24" x 36" size and shall include a bill of material for the drawing),

2. Piping plans, sections and details, 3. Pipe support details, 4. Skid framing plans, sections and details, 5. Vessel drawings and data sheets, 6. Pump drawings and data sheets, 7. Exchanger drawings and data sheets, 8. Instrumentation detail drawings and data sheets, 9. Electrical schematics and detail drawings.

8. Mechanical Design

8.1. Contactor a. The glycol contactor shall be designed for installation as indicated on detailed drawings

and data sheets. b. The contactor shall be a vertical tower with structured packing. The height of packing

shall be equivalent to two theoretical contact stages as a minimum. c. If the height specified for packing on data sheets is greater than 2 equivalent theoretical

stages, the greater height shall be used. d. If the contactor ID is greater than 610 mm (24O.D.) contactor shall be provided with two

457 mm (18O.D.) ID manways, one located in the space above the packing and the other located in the space below packing. If the contactor ID is greater 150 cm (5 ft.) then the man ways shall be 610 mm (24O.D.) to allow for ingress into the vessel with a personal air pack. Contactors with IDs of 610 mm (24O.D.) or less should be provided with flanged heads and 203 mm (8O.D.) inspection openings on top and bottom.

e. Packing shall be removable in sections thru the man ways. f. Packing shall be supported by grid type supports at the bottom. Hold down supports shall

also be provided at the top of the packing. Supports shall be 304 SS minimum. g. The contactor shall be furnished with a liquid distributor sized for liquid flow rates

specified in the data sheets and designed specifically for gas dehydration applications with TEG. The distributor shall be removable in sections thru the man ways. A trough type distributor, flowing by liquid head, is preferred. Spray type distributors shall be used only with specific approval by BP representative.

h. Internal material for packing, support and the distributor shall be 316 SS. i. The contactor shall be furnished with a high performance vane pack to minimize the glycol

carryover with the gas. Glycol losses shall not exceed 13 ml/km (0.1 gal/MMSCF). The liquid drain from the vane pack shall be routed into the distributor. The vane pack shall be 316 SS. Internal bolting and hardware used shall be 316 SS.

j. The maximum allowable pressure drop of gas through the contactor shall not exceed 350 mbarg (5 psig).

k. The gas inlet nozzle to the glycol contactor shall be provided with an inlet diverter. l. The liquid section of the glycol contactor shall have sufficient volume to hold all the glycol

held in the structured packing.



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m. Unless specified otherwise, the contactor shall be capable of turndown to 25% of the specified maximum gas rate, maintaining design glycol to gas ratio. Further gas turndown shall be available to essentially no flow, based on maintaining minimum 25% glycol rate.

n. If necessary, a removable external caged ladder of welded construction shall be furnished to access the manways, inspection openings, valves, instruments, and other components. The ladder shall be hot dipped galvanized after fabrication and trial fitted on the contactor before shipment.

o. If specified on the data sheets, an integral scrubber shall be provided built-in to the vertical column, complete with mist extractor and separate liquid dump controls.

8.2. Gas / glycol heat exchanger a. The end connections of the exchanger shall be flanged. b. The exchanger shall be of the shell and tube construction, with gas in the tube side.

Contractor may propose an alternate design as an option. c. Unless otherwise noted, the maximum allowable pressure drop of process gas through the

exchanger shall be 680 mbar (10 psia). d. The exchanger shall be designed for full design differential pressure from either side, with

zero pressure on the other side. e. The exchanger shall be trial fit prior to shipment. f. The exchanger shall be designed and constructed per BP Specifications as per data sheets. g. Unless specified otherwise, the exchanger shall be rated for glycol inlet temperature of

93.3C, (200F) and an approach temperature of outlet glycol to inlet gas of 8.3C (15F). h. Construction of the exchanger, with provisions for dismantling and tube bundle removable,

is required, unless indicated otherwise in the project supplement or data sheets.

8.3. Gas inlet filter / separator a. A 0.3 micron absolute rated vertical filter coalescer separator or BP approved equal shall

be provided to treat the gas upstream of the glycol contactor. b. The filter coalescer separator shall be sized for the maximum gas rate specified on the data

sheets. c. The liquid carryover from the vessel shall not exceed 6 ml/km (0.05gal/MMscf). d. The filter separator shall be designed for a clean pressure drop of less than 350 mbar

(5 psia) and a maximum allowable pressure drop of 1,37 bar (20 psia).

8.4. Glycol reboiler a. The glycol reboiler / surge tank shall be either a single vessel design, or separate vessel as

indicated on the data sheets. Where the use of stripping gas with an external stripping column is required, a separate surge tank is required, located underneath the reboiler to provide for gravity flow through the stripping column.

b. The heating element, inspection openings and controls shall be accessible from skid level or by an access platform of welded and galvanized construction.

c. The glycol surge tank shall be designed to hold a minimum of 25% of the total glycol charge, with the tank full (level at centerline) and the system hot.

d. The glycol reboiler shall be designed to ensure that the heating elements are always submerged.



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e. The reboiler shall be sized to handle the maximum glycol rate and water load assuming that the temperature to the still is 121C (250F) and that the maximum reboiler temperature is 201C (400F).

f. The glycol reboiler shall be designed and fabricated in accordance with BP specifications as specified on the data sheets.

g. Unless otherwise specified on the data sheets, the glycol reboiler shall be horizontal, direct fired, with a removable fire tube and stack, utilizing natural gas as fuel.

h. Heating by heat media in a tube bundle or electric element heating shall be used when specified on the project data sheet.

i. The maximum fire tube or heating element skin temperature of the glycol shall not exceed 210C (410F).

j. The bulk glycol temperature shall not exceed 201C (400F). k. The maximum heat flux shall be 25 kw/hr-m (8000 btu/hr-ft). l. The glycol reboiler shall contain a fuel gas preheat coil within the surge tank section of the

reboiler, when specified in the project specific data. m. Unless otherwise specified, the glycol reboiler shall be equipped with a natural gas fired

forced draft burner approved by BP. Maxon Tube-O-Flame, North American is the preferred burner. If not available, then a similar quality and kind should be used.

n. The burner system shall include modulating firing controls which maintain proper fuel/air mixture throughout the firing range continuous pilot, and corrosion resistant combustion air blower.

o. Forced draft burners shall be controlled by a BP approved burner management system. This system shall be PLC based.

p. Firetube U-bend shall be triple mitered pipe or weld elbows and the stack 90 bend shall be double mitered pipe or weld elbows. If a high intensity forced draft burner is to be used, the first 2 m (6 ft.) of the fabricated fire tube inlet shall be constructed out of Incoloy 800 HT.

q. Flash gas from the glycol / hydrocarbon separator shall preferentially be used as reboiler fuel gas. Provisions shall be made for make-up fuel gas from the fuel gas system if insufficient flash gas is available. Excess flash gas shall be vented to a relief header terminating with a flange at skid edge.

r. A reboiler fuel gas scrubber shall be provided just ahead of the reboiler and shall be designed to remove any entrained liquids from the fuel gas before the gas is burned in the reboiler.

s. The reboiler fuel gas scrubber shall be designated as a vertical vessel with a level gauge, a manual drain piped into the skid closed drain systems and all required safety equipment.

t. Reboilers heated by heat media shall include a removable U-tube bundle. The tube bundle shall be designed and fabricated in accordance with BP Specification specified on data sheets. The reboiler temperature shall be controlled by ranging heat media rate through the bundle. Design and rating conditions of the exchanger shall be as specified on the data sheets.

8.5. Stripping gas a. Stripping gas shall be used when specified. Normally stripping gas will not be used to meet

initial design conditions, but provisions will be included for future use of stripping gas. These provisions shall include a sparger in bottom of the reboiler.



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b. Where process requirements necessitate the use of stripping gas to meet initial design conditions, stripping shall be by use of an external counter-current stripping column. This column shall contain a minimum of one theoretical stage of 316 SS pull-ring packing, with 316 SS packing top and bottom support grids.

c. Stripping gas supply shall be preheated to near glycol temperature by a coil in the reboiler. d. Stripping gas systems shall be designed for rates up to 540 l/litre (5.0 scf/gal) of glycol.

8.6. Re-boiler still column a. The still column shall be vertical. The column shall contain packed sections with a

minimum of three feet of packing above and below the feed point. The packed section is to be flanged at both ends to facilitate replacement of the packing. Packing shall be 316 SS Pall rings, or BP approved equal. Top and bottom packing support grids shall also be 316 SS.

b. The still column reflex condenser shall be a coil section within the column designed to control overhead vapour temperature between 100C (212F) and 107C (225F), using the rich glycol stream as a cooling medium in counter-current flow.

c. The reflux coil section shall be removable for replacement and shall have a design working pressure the same as the contactor at 121C (250F).

d. The reflux coil shall be 316 SS seamless pipe with a minimum schedule of 80, or a minimum 12 BWG of 316 SS tube.

e. The still column shall have flanged connections to the reboiler and the vent outlet. f. The still column shall be designed and constructed in accordance with BP specifications as

specified on data sheets. g. The still column and reflux coil shall be designed for maximum water load, considering

reflux equivalent to 25% of the total water load and a maximum of 540 l/litre (5.0scf/gal.). of stripping gas.

h. Condensed vapours off of the still vent shall be piped into a containment system, and shall be provided with liquid seal.

8.7. Pumps a. Pumps shall be provided as per GP 34-00 and as specified on data sheets. b. Only heavy duty, industrial-type equipment should be considered adequate for this service. c. Pumps shall be of a type specifically designed for glycol service.

Rotor-Tech pump or equal d. All anti-friction bearings shall be of heavy-duty construction using vacuum degassed

bearing materials. e. If roller bearings are used for thrust purposes, they shall be of the duplex tapered roller

type.

f. Anti-friction bearings shall have a minimum life of 30,000 hours of continuous duty for the rated operating conditions.

g. Lubrication shall be integral with the compressor unit and shall be of the differential forced feed type.

h. A minimum of two pumps shall be provided, each sized for 100% flow - one operating and one spare. The type of pump provided is specified on the data sheets. Pumps shall be reciprocating plunger or rotary gear type, unless specified otherwise.



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i. All suction and discharge piping shall be arranged such that one pump may be removed from service and replaced without shutdown of the operating pump.

j. The pumps shall be designed to provide a differential head that is equal to the contactor design pressure.

k. The pumps shall be equipped with suction strainers. The mesh size and the flow area shall be in accordance with the pump manufacturer's recommendation.

l. Rods and plungers shall have Colmoloy or equivalent hard facing where packing wear may occur.

m. The pumps shall have flanged suction and discharge connections. n. Suction flanges shall be rated for discharge pressure. o. Suction stabilizers and discharge pulsation dampeners shall be provided on each

reciprocating pump, located as close to the pump connections as possible. p. Reciprocating pumps shall normally be splash lubricated and equipped with oil level

gauges.

q. Electric motor driven reciprocating pumps shall be Union or equal with forged or cast steel fluid end, carbon or stainless steel connecting rods, stainless steel valves, and braided graphitic yarn lubricated non-asbestos packing. Maximum piston speed shall be 120 FPM.

r. Electric reciprocating pumps shall have a suitable V-belt drive with sheaves sized so that the pump speed can be reduced to 25% of the design speed without changing the driven sheave or guard. Galvanized carbon steel or copper free aluminum removable belt guards shall be furnished, complete with 316 SS bolting. Access doors shall be provided to enable belt tensioning without removal of guard.

s. Each electric driver shall be in accordance with GP 12-20 as specified on data sheets, and shall be equipped with 120 VAC space heaters.

t. Rotary gear pumps shall be direct coupled to the electric motor drive. u. Glycol pumps shall have a discharge flow indicator and manual throttle by-pass to the

surge tank for controlling net glycol flow to the contactor. v. Pumps shall be provided with packing / seal leakage containment pans piped to the skid

drip pan or other containment system.

8.8. Glycol / hydrocarbon separator a. Unless otherwise specified, the separator shall be a horizontal, three-phase bucket and spill

over weir type with a minimum of twenty minutes retention time on glycol when operating at 65% full.

b. A 316 SS vane type mist eliminator shall be installed in the vapour outlet. c. The separator shall be insulated for heat conservation. d. The separator shall be designed and fabricated in accordance with BP specifications

specified on data sheets. Unless otherwise indicated on the data sheets, design conditions shall be 10 barg (150 psig) at 121C (250F).

8.9. Rich / lean glycol exchangers a. Rich/ lean glycol exchangers shall be divided into two services: the cold exchanger located

in the rich glycol flow before the glycol/hydrocarbon separator, and the hot exchanger located after the separator.

b. Exchangers shall be rated to meet the following temperature conditions: 1. Lean glycol to surge tank = 93C (200F) maximum,



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2. Rich glycol to glycol/hydrocarbon separator = 79-104C (175-220F), 3. Rich glycol to reboiler = 148C (300F) minimum, 4. Rich glycol to cold exchanger = 40.5C (105F).

c. The rich / lean glycol exchangers shall be external of the reboiler and may be either shell-and-tube or finned tube hairpin type. Plate type exchangers are not acceptable.

d. The heat exchangers shall meet the Standards of Tubular Exchangers Manufacturer's Association. Hairpin type exchangers shall meet TEMA Standards where applicable.

e. Piping connections to the heat exchangers shall be flanged. f. The exchangers shall be located and arranged to facilitate the inspection, cleaning and

removal of the tube bundles. g. The rich / lean glycol exchangers shall be provided in accordance with BP specifications

specified on data sheets. h. Exchangers shall be designed for 10 barg (150 psig). i. For units utilizing an external stripping gas column, pressure drop through the lean glycol

side (shell) of the exchangers is critical due to limited head available on the lean glycol side without flooding the stripping column. Contractor shall demonstrate adequate head to be available for the lean side pressure drop quoted.

8.10. Filters

8.10.1. General a. All filters shall be carbon steel and designed for the maximum system design rating. b. Filters shall be designed as specified on data sheets. c. A full opening davited or hinged top closure, with an air vent valve, shall be provided for

removal of the elements. d. In addition to the start-up elements, the contractor shall furnish two additional replacement

sets of filter elements. The replacement sets of elements shall be 5 micron and the start-up set shall be 20 micron.

e. Filters shall be installed with clear access to facilitate changing filter elements. Platforms shall be provided if required for access to change filter elements.

f. All filters shall be equipped with differential pressure indicators.

8.10.2. Rich Glycol filter a. The filter shall be located in the rich glycol flow upstream of the charcoal filter. b. If a "sock-type" filter is used it shall be a PECO Series 55 or BP approved equal vertical

full flow type with removable elements. The "sock-type" filter shall be sized for removal of solids 5 microns and larger in diameter.

c. If absolute rated filters are used, the engineering firm should consult the manufacturer for the micron size to use for start-up and under normal clean operation.

Absolute rated filters are considered to be the best practice in filtration. For particulates in rich glycol service, initially start with 50 micron and work down to 10 microns. Sock and absolute rated elements are not the same at the same micron. A 5 micron nominally rated sock corresponds to a 50 micron absolute.

d. BP should conduct an engineering and operational analysis to determine if the lean glycol should also be filtered.



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8.10.3. Charcoal filter The charcoal filter shall be a PECO Series 10 or BP approved equal vertical full flow type with removable cartridge type charcoal elements.

8.11. Piping a. All regeneration unit drains and vents shall be continuously piped to the skid edge. b. When piping tie-in locations are specified in the project supplement, they shall be strictly

adhered to. c. Regeneration unit closed drains will be piped into a single header, sloped to the skid edge

at a minimum slope of 1:50. d. All piping shall be designed in accordance with the requirements of GP 42-10. e. Pressure relief shall be designed in accordance with the requirements in GP 44-70. f. All terminating lines shall be extended to the edge of the skid and terminated with a full

hammer union or flange. g. No piping shall be installed outside the skid limits. h. Each skid shall contain a minimum 25mm (1O.D.) instrument air header. One end of the

header shall terminate at the edge of the skid with a union, while the other end shall terminate with a 12.7 mm (O.D.) ball valve drain. Each end device shall have a 12.7 mm (O.D.) ball valve, at the take off point from the instrument air header. A minimum of two spare takeoff points with valves shall be provided on each instrument air header.

i. Piping shall be insulated for heat conservation or personnel protection, as applicable, in accordance with data sheets and shall conform to the requirements in GP 52-10.

j. Piping shall be arranged to allow removal of any piece of equipment for maintenance or replacement, without interruption of the units operation.

k. API Standard RP-E shall be applied during the design and installation of piping if intended for use on offshore production platforms.

l. Emergency depressurizing valves and piping to skid edge shall be provided to enable depressurizing of all gas inventory down to 7 barg (100 PSIG) or half the operating pressure, whichever is the lesser, within 15 minutes.

9. Electrical

a. Electrical equipment associated with the Glycol Dehydration and Regeneration Skid shall be designed and installed in accordance with the following specifications: 1. GP 12-45, 2. GP 12-20, 3. GIS 12-201, 4. GIS 12-202.

b. Electrical area classification shall be as specified and should comply with GP 12-60 and NEMA 250 standards.

c. Induction motors shall be in accordance with Motor Data Sheets and GP 12-20. d. Motor power cables and cable tray or conduit shall be run directly to the motors from the

MCC. e. All electrical equipment shall comply with NFPA Standards 70, 493 & 496.



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f. Vendor shall install a 125 cm (4 ft.) stand located adjacent to motors for installation of local motor control stations.

g. Electric heated reboilers shall include removable electric resistance heating elements attached by flange to the reboiler vessel. Elements shall be equipped with junction boxes for power and control wiring.

h. Heating elements shall be resistance type with the heat producing elements contained in corrosion resistant tubes. Tubes shall be welded to the mounting flange. Contractor shall provide a separate control panel for operation of the elements.

i. Heating element junction boxes shall be NEMA 4X or NEMA 7/9 (or IEC equivalent) as required. Boxes shall be sized to ensure adequate ambient cooling at maximum electrical load and high fluid temperature, and shall be arranged for ease of maintenance. Cable entry location shall be as indicated on the data sheets.

j. Contractor shall install and connect with the appropriate wire or cabling system located on all motors and controls on the skids.

It is the intent of this specification to have the contractor complete the wiring to either the panels or junction boxes located on skid for minimum connections by others at the installation site.

10. Instrumentation

10.1. General a. As a minimum instrumentation shall be provided and installed in accordance with:

1. GP-30-25, 2. GP 30-35 3. GP 30-70, 4. GIS 30-402 5. Data sheets.

b. Contractor shall wire all devices, alarms, and shutdowns to the Glycol Dehydration and Regeneration Control Panel.

c. All instruments shall be tagged utilizing BP formatted tagging system. d. Contractor shall select instrument manufacturers from BP provided approved List. e. Instruments and controls shall be provided as required for unattended operation. f. All instruments and controls shall be installed after the vessels and piping have been tested,

blasted, and painted. g. Contractor shall perform on-skid instrumentation and control panel hook-up. Contractor

shall provide all labour, tubing, fittings, conduit, wiring, clamps, supports, etc., required to install the control panel and connect all on-skid instruments and controls necessary to form a complete and functional unit.

h. Contractor shall provide sizing calculations and completed data sheets for review and comment by BP, prior to purchase of instruments (example in API RP 520 ISA).

10.2. Control panel a. The contractor shall provide a skid mounted PLC based BP approved burner management

and control system. The PLC shall conform to the requirements in GIS 30-402. b. If unit is offshore use, the control panel shall be suitable for offshore environment.



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c. The unit shall be certified by a nationally recognized third party testing entity as an assembly for hazardous area classification Class I, Division 2, Group D.

d. Contractor shall furnish the control panel, logic diagrams, schematics, and layout drawings for BP approval prior to fabrication. Contractor shall provide a complete listing of all the components with manufacturer, model number, and a description per nominated manufacturers list.

e. The contractor shall be responsible for the burner control logic and programming. f. The reboiler burner control panel shall be a NEMA 4X 316 SS enclosure installed on the

reboiler skid. All electrical switches, pushbuttons, etc. mounted in the panel shall be hermetically sealed and suitable for Class 1, Division 2 area. Purging of enclosure to lower the classification shall not be accepted.

g. The contractor shall locate the burner control panel near the burner. h. All electrical end devices for the reboiler burner controls shall be terminated to the burner

control panel. All field switches hand / off / auto, reset, etc. - and status indication lights shall be mounted on this panel.

i. Supply of power to the regeneration skid for the burner control panel will be in accordance with the project specification as applicable.

j. The burner control system shall supervise lighting, shutdown and operation of the burner. The system shall be fully automated and shall include the following features: 1. Fire tube pre-ignition and post shutdown purge, 2. Minimum fire light off, 3. Ultra violet flame monitoring, 4. Continuous pilot, 5. Fuel modulating temperature control down to minimum stable firing condition, with

on/off burner control below minimum fire condition, 6. High/low fuel pressure shutdown, 7. Low combustion air pressure and blower motor interlock shutdowns, 8. High stack temperature shutdown, 9. Remote shutdown due to process upset or emergency, 10. Signal for remote annunciation of burner malfunction, 11. Panel shall operate on 120 VAC control power.

10.3. Electric heater controls a. The contractor shall provide a separate control panel for operation of the reboiler electric

heating element(s). b. The panel shall be located as specified by BP. The panel shall meet the requirements of

the referenced specifications for mounting location. Panels located indoors shall be minimum NEMA 12 construction. Panels located outdoors shall be minimum NEMA 4X 316 SS construction.

c. Control panel shall include the following functions and features: 1. Power on/off switch, 2. SCR type heater controller, with input circuitry that accepts input from process

temperature transmitters, 3. Control shall be modulating to all elements over full range,



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4. Temperature shall be indicated on the panel, 5. SCR firing shall be zero crossing type or as required to avoid malfunctioning of BP

power generation system control components (governor), 6. High temperature shutdown, 7. Individual short circuit protection for each element, 8. Contacts for permissive on and remote shutdown due to process upset or

emergency, 9. Status and alarm indication lights, 10. Contract for remote annunciation of unit malfunction or alarm, 11. Control panel shall operate on 120 VAC control power.

d. Panel shall be rated for fault current as specified in the project supplement on data sheets. e. Panel shall be furnished with a ground fault system as specified in the project supplement

or data sheets. f. Electric heating element controls shall be SCR type. Control shall not be accomplished by

turning element on or off. Control shall be accomplished by regulating current through the elements to match heat demand. Heating elements shall be shutdown on high process temperature or high element temperature.

11. Safety systems

a. API Standard RP-C shall be applied during the design, installation and testing if intended for use on offshore production platforms.

b. Unless specified otherwise in the project supplement, safety system functions in the regeneration system, not included in the burner or electric heater panel, shall be handled in BPs overall facility Emergency Shutdown System.

c. The contractor shall wire safety end devices to an on-skid junction box. Where specified, the junction box shall include I/O for input to a PLC based system.

d. If specified, the contractor shall provide a dehydration system panel to handle safety system logic.

e. The panel shall be located on-skid or off-skid as specified in the project supplement. f. BP shall provide details of panel design and requirements when required. g. Dehydration safety system end devices shall include the following, as is applicable:

1. Reboiler high and low level, 2. Reboiler high temperature, 3. Surge Tank high and low level, 4. Glycol pump high/low discharge pressure, 5. G/H Separator high and low levels, 6. G/H Separator high/low pressure, 7. Glycol Contactor high and low level, 8. Inlet Filter Separator high and low level, 9. Inlet Filter Separator high/low pressure, 10. Glycol Contactor Glycol Outlet SDV,



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11. Glycol Pump Shutdown, 12. Burner or Electric Heater panel Shutdown, 13. Heat media supply SDV, 14. Other items as indicated on project drawings and data.

12. Materials

a. All vessel, pump and exchanger material is to be provided as per the data sheets and the referenced specifications.

b. The contractor is requested to provide a complete, detailed, individually priced list of recommend start-up spares and spares for 2 year continuous operation of the glycol unit.

c. Materials shall be selected based on the requirements in GP 36-10.

13. Insulation

Insulation shall be provided for equipment and piping operating above 71C (160F) as indicated on the flow diagrams and in accordance with GP 52-10 and as specified on data sheets.

14. Structural

a. As a minimum, the skid shall be designed and furnished in accordance with: 1. GP 40-10, 2. GP 4-20 3. GP 18-01

b. All equipment supports shall be capable of withstanding the operating acceleration loads as calculated in accordance with BP specifications & data sheets.

c. Skid dimensions shall be kept to a minimum consistent with providing good access to equipment operation and maintenance.

d. If the skid is to be installed offshore, then lifting requirements at the offshore location will determine the design of the skid under frame.

The offshore lift is particularly dangerous to a skidded piece of equipment and impact loading to the skid and dropping of the skid to be caught by the slings are design conditions. The problem is wave height compared to the barge or ship on which the equipment is to be delivered. If the sea area around the offshore platform normally has 10 foot waves, then you can have the possibility that you tie onto the skid with the slings and spreader bar and at the top of the wave and then the ship goes to the bottom of the wave and the whole skid load is dropped and then caught by the slings. Then just as quick the ship rises and the skid is pounded and uplifted by the ship. Also see 17.A below.

15. Painting

a. The Glycol Dehydration and Regeneration Package shall be painted in accordance with GP 6-60.

b. Final paint coating shall be performed after the completed module has been fully assembled and hydro-tested.



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c. Instrument tubing shall either be protected from overspray during final coating or shall be installed after the final coating of paint is applied.

16. Inspection and testing

a. BP shall perform inspection and testing of the Glycol Dehydration and Regeneration Package in accordance with: 1. GP 32-10, 2. GP 32-20 3. GP 32-50 4. GP 32-51.

b. Contractor shall conduct a function test for the entire Glycol Dehydration and Regeneration Package to ensure proper operation of all equipment and instrumentation.

c. Contractor shall prepare the function test procedure for approval by BP before commencement of any testing.

d. Materials or equipment not conforming to BP specifications shall be rejected. e. BP reserves the right to have its representative travel to manufacturer or point of origin for

inspection purposes. Such travel and inspections are at BP's expense. f. Inspection and testing shall be in accordance with the referenced specifications, codes and

standards. g. Inspection hold points shall be as specified in the supplement to this specification. h. The approval of any work by BP and release for shipment shall in no way relieve

contractor of any responsibility for carrying out the provisions of this specification. i. No pressure parts or structural framing shall be painted or galvanized until inspection is

completed. j. The contractor shall functionally test the reboiler burner control system by connecting the

end devices to the burner control system and verifying the operation of each end device as required.

k. Testing shall include operation of the combustion air blower and ignition of pilot. Main burner will not be fired for testing.

l. BP or its representative will witness all operational tests. m. The contractor shall operationally test all controls and end devices with the panels

connected, verifying operations of each component as required. n. All electrical equipment shall be functionally tested by the contractor to the greatest extent

possible. The BP shall witness any and all tests carried out by the contractor. o. If required, the contractor shall provide office space for BPs inspectors and other

representatives. Requirements will include office space with a minimum of two desks and chairs, a reference table, file cabinet, telephone service and access to fax and copy machines.

p. BP representative shall be provided access to work during normal business hours whether in progress or completed, to inspect and check that materials, workmanship, fabrication, installation, schedule, inspection, and testing are in accordance with Inquiry Documents.

q. The presence of a BP inspection or representative during the work shall in no way relieve the contractor of any responsibility for the quality of the work performed or his own quality control or inspection requirements as defined by the specifications.



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r. The contractor shall test the instrument air piping at 10 barg (150 psig) with air or nitrogen and a soap solution.

s. The contractor shall provide BP with a test chart for hydrostatic tests. t. BP shall be notified one week prior to all hydro-testing and functional testing. u. After completion of hydro-tests, all vessels and piping shall be thoroughly drained, flushed

and dried. v. Calibration and functional testing of process instruments shall be performed by the

contractor in accordance with the technical specifications.

17. Preparation for shipment

a. The mechanical design of the package should be checked against loads imposed by transporting the package to its eventual site.

Transportation loads are specified by the Purchaser. This requirement is principally to cover offshore design, where the unit may be subjected to abnormal loads during load-out. It may also be tested full of glycol at the fabrication yard. In this case, leaving it liquid-full can save significant time, material cost and effort at a critical stage in construction. However, the implications for skid structure design will have to be checked.

b. All internal surfaces of the casing, rotors, gears, oil passages, and all bearing surfaces shall be coated with a suitable rust preventive compatible with the operating lubricating oil.

The rust preventive may be applied by completely filling each cavity until all interior surfaces are satisfactorily coated, then draining the cavity. This approach may be used for tubing and passages.

c. Rust preventive must be forced under pressure into oil passages and bearing surfaces. d. The completed skids shall be loaded out by the contractor onto a trucks provided by the

contractor.

e. It shall be the contractors responsibility to provide any spreader bars, slings and shackles, tracks, dollies and other items as may be required to load out or move the equipment and skids in the contractors yard. The cost of any such spreader bars or rigging shall be borne by the contractor.

f. Slings and shackles shall be rigged such as to avoid interference with, or damage to equipment, piping and paint. If some minor disassembly is required for purposes of rigging up slings, such components as may be required to be removed shall be securely tied down to the skid for re-assembly by others.

g. Load out of the skids shall be performed under the supervision of the BP representative, however, the responsibility for load out remains with the contractor. Shoring of the skids on suitable transportation shall be the responsibility of the contractor and performed to the satisfaction of the BP representative.

h. If the contactor is shipped horizontal, the contractor will be required to add lifting lugs in order to lift the vessel in the horizontal position. Any braces or supports required for shipping the contactor will be supplied by the contractor.

i. All instruments and controls that may be subject to damage due to handling during lifting or transport are to be removed, tagged and placed in protective, waterproofed wooden crates secured to the skid for shipment.

j. The contractor shall tag each item removed for shipment, provide a typed ship loose list and mark-up drawings shall also be packed in the waterproofed wooden crate prior to shipment.



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k. The contractor shall provide and box for shipment with the unit all new gaskets and bolting required for re-assembly at site and 10% extra bolting for any bolted connections dismantled for shipping.

l. Control valve stems, outside valve yokes and stems or other components that may be subject to corrosion shall be coated with a protective rust inhibitor.

m. Level control floats or displacers shall be suitably secured to prevent damage to the instrument during shipment.

n. The contractor shall protect all machined surfaces and threaded connections with rust preventative.

o. Unless specified otherwise on the equipment data sheets, all flanged openings shall be protected with one piece plywood covers. Plywood covers are to be " (9.5 mm) thick for flange sizes 6" (152.4 mm) and smaller, (12.7 mm) thick for 8" (203 mm) through 12" (304 mm) and (19 mm) thick for larger sizes. A minimum of four " (9.5 mm) galvanized bolts shall be used for flange sizes 12" (304 mm) and smaller and eight " (9.5 mm) galvanized bolts for larger flange sizes. Large galvanized washers are to be used on the flange size of the bolt. Suitable galvanized washers are to be used on the plywood size of all such covers.

p. Screwed connections are to be protected with threaded forged steel hex head plugs. q. Each major component shall be properly identified with item and serial numbers. All

material shipped separately shall be properly tagged or marked with the item and serial number for which it is intended.

r. Small, easily damaged parts shall be removed from shipping. The part removed and the location the part was removed from shall both be identified with securely attached 316 SS metal tags, with 316 SS wire indicating the instrument and tag number. All items that can be damaged by water shall be securely wrapped in waterproof paper before being placed in wooden crates.

18. Vendor data requirements

a. The contractor shall submit all vendor data in accordance with the supplement to this specification.

b. The contractor shall include copies of electronic drawing files when submitting final drawings to BP.

c. All full size drawings shall be 24" x 36" (609 x 914 mm) and shall include a bill of material for the drawing.

d. The following information shall be completed where applicable and submitted for review and approval prior to the start of any fabrication. 1. Plan layout, showing access platforms, walkways and clear access areas, 2. Engineering, operating and performance design data and sizing calculations for all

items, 3. Structural drawings and design calculations, 4. Vessel, reboiler, filter and exchanger drawings, 5. Assembly piping drawings consisting of, as a minimum, plans, elevations and

sections as required for dimensional elevations of piping and components, 6. Piping and components bill of material.



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e. The contractor shall resolve all BP comments, incorporate comments on the drawings and re-issue to BP within ten days. BP approval shall be received before commencing fabrication. No subsequent revisions may be issued without BP approval.

19. Warranty

a. The contractor shall guarantee all work to be free from defect in design, workmanship, materials, and equipment.

b. The contractor shall repair or reinstall, without cost to BP, any work, material, or equipment furnished by him that shall become defective or not operate in accordance with the design requirements except for wear and tear, during the progress of the work or during a period of twelve months after successful start-up.

c. The contractor shall guarantee the operation of the unit to the design conditions as stated in the equipment data sheets for the duration of the warranty period.

d. Under this warranty, the contractor shall replace all materials and / or part at his expense that are found to be faulty or which do not meet the specified design conditions during the guarantee period.

e. The contractor shall also furnish at his expense an experienced service representative to supervise all necessary repairs and replacements.

20. General requirements for utility packages

If not specifically stated in this GIS, the supplier shall follow the requirements in GP 60-50.

gis 47-101 29 february 2008

Documents

bp etp

supply document

supply gis

applicability group

merged bp companies

glycol dehydration unit

gas glycol heat exchanger

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