MINISTRY OF ENERGY IRAN POWER DEVELOPMENT CO.

I P D C

PROJECT : 22 COMBINED CYCLE POWER PLANTS YAZD COMBINED CYCLE POWER PLANT

System Description

For Start-Up/Blow down System

A Revised according to P22-2554(D00734) 04.09.22 D.S KIM 04.09.22 B.J PARK 04.09.22 S.G JUNG 04.09.22

0 FIRST ISSUE 04.03.12 D.S KIM 04.03.12 B.J PARK 04.03.12 S.G JUNG 04.03.12

REV DESIGNATION DATE DESIGN DATE CHKD DATE APPROVED DATE

DOCUMENT NO. : MP-YZC-BA-04-HG0-005-A REV. A MAPNA C o . ( PRIVATE JOINT STOCK )

IRAN POWER PLANT PROJECTS MANAGEMENT Co. CONTRACT NO. : 22-0701/BA/TL PAGE 1 OF 6

ORIGINATOR NO. : YZC-A-SP-201-SDE-005-1 A4 ORIGINATOR

DOOSAN HEAVY INDUSTRIES & CONSTRUCTION CO.,LTD. ORIG

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FOR APPROVAL

MINISTRY OF ENERGY IRAN POWER DEVELOPMENT CO.

I P D C

PROJECT : 22 COMBINED CYCLE POWER PLANTS YAZD COMBINED CYCLE POWER PLANT

REVISION REVISION

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DOCUMENT NO. : MP-YZC-BA-04-HG0-005-A REV. A MAPNA C o . ( PRIVATE JOINT STOCK )

IRAN POWER PLANT PROJECTS MANAGEMENT Co. CONTRACT NO. : 22-0701/BA/TL PAGE 2 OF 6

ORIGINATOR NO. : YZC-A-SP-201-SDE-005-1 A4 ORIGINATOR

DOOSAN HEAVY INDUSTRIES & CONSTRUCTION CO.,LTD. ORIG

LOC. ORIG. DEPT.

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DISC.

DOC. TYPE

AREA TYPE

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SEQ. N.

SH. N. REV. A

22 Units Combined Cycle

SYSTEM DESCRIPTION FOR HRSG Start-Up/Blow Down SYSTEM

DOOSAN Changwon, KOREA

Contract No. : 22-0701/BA/TL

Originator No. : YZC-A-SP-201-SDE-005-1 Appendix :

Revision : A Date : Sep.22.04

Page: 3 of 6

CONTENTS CLAUSE NO. DESCRIPTION PAGE NO.

1.0 GENERAL DESIGN CONCEPT 4 1.1 APPLICABE CODE 4 2.0 OPERATING CONCEPT 5 2.1 PREPARATIONS 5 2.2 START-UP AND SHUTDOWN 5 2.3 OPERATION, CLOSED AND OPEN LOOP CONTROLS 5 3.0 REFERENCE FILE 6

22 Units Combined Cycle

SYSTEM DESCRIPTION FOR HRSG Start-Up/Blow Down SYSTEM

DOOSAN Changwon, KOREA

Contract No. : 22-0701/BA/TL

Originator No. : YZC-A-SP-201-SDE-005-1 Appendix :

Revision : A Date : Sep.22.04

Page: 4 of 6

1.0 General Design Concept The start-up/Blowdown system is to collect and discharge excess water from HP, LP and Integral Deaerator system. And, the blowdown system has the task to receive the water/steam of the continuous blowdown HP drum, LP drum and Storage tank. All water arising is collected in the blowdown tank and discharged to HRSG area sump. The system fulfils the following requirements :

l to collect water from HRSG system. l to receive water from the drums during normal operation. l to deliver collected water into HRSG area sump.

l to control discharged water temperature down to 70 deg.C during normal operation

using service water.

l to control discharged water temperature down to 90 deg.C during start-up using service water .

l To collect the drains from the start-up and shutdown systems of each HRSG.

The resulting vapor is led to the atmosphere by means of an exhaust vapor pipe: Level indicator is installed to check level of blowdown tank. The design of the blowdown tank is based on the applicable codes. 1.1 Applicable Code 1.1.1 US STANDARDS

AISI, ANSI, API, ASME, ASNT, ASTM, AWS, EIA, HEI, HIS, IES, IEEE, ISA, MSS, NEMA, NFPA, OSHA, PFI, SAMA, SSPC, TEMA

1.1.2 Other International Standards

DIN, NG, IFC, ISO, JIS, UL, WHO

A

22 Units Combined Cycle

SYSTEM DESCRIPTION FOR HRSG Start-Up/Blow Down SYSTEM

DOOSAN Changwon, KOREA

Contract No. : 22-0701/BA/TL

Originator No. : YZC-A-SP-201-SDE-005-1 Appendix :

Revision : A Date : Sep.22.04

Page: 5 of 6

2.0 Operation Concept 2.1 Preparations Service water system for quenching shall be in a stage of ready. . 2.2 Start-up and Shutdown The maximum drainage discharge to blowdown system occurs during plant start-up. Therefore both HRSGs can be started only if blowdown system is ready. 2.3 Operation, Closed and Open Loop Controls The outlet water temperature of blow down tank would be controlled to meet 70 deg.C at normal operating and 90 deg.C at start-up by quenching water control valve(PAA90AA151) detecting signal from TIC(LCQ60CT101) of DCS.

A

22 Units Combined Cycle

SYSTEM DESCRIPTION FOR HRSG Start-Up/Blow Down SYSTEM

DOOSAN Changwon, KOREA

Contract No. : 22-0701/BA/TL

Originator No. : YZC-A-SP-201-SDE-005-1 Appendix :

Revision : A Date : Sep.22.04

Page: 6 of 6

3.0 Reference File

1. MP-YZC-GA-02-HL0-005 : P&ID DIAGRAM FOR START-UP/BLOWDOWN