vit154 xs00 lba80 rev b

DRAWING/DOCUMENT STATUS: FOR CONSTRUCTION

b 2005-03-30 Revision Heilmann Fuchs Schobert a 2005-12-15 First Issue Heilmann Fuchs Schobert

Rev. DATE DESCRIPTION Bearb. Coord. Geprft

Checked APPD.

PROJECT :

CAMAU 1 750MW COMBINED CYCLE POWER PLANT OWNER : OWNERS ENGINEER :

PETRO VIETNAM CPMB

CONTRACTOR : CONTRACTORS ENGINEER :

LILAMA CORPORATION FICHTNER

SUBCONTRACTORS NAME : SUBCONTRACTORS SUPPLIER :

s POWER GENERATION

DRAWING TITLE :

LP Main Steam Piping System PKZ UAS Contents Code Reg. No. UNID

Ursprung/Original Ursprung-Nr./Original-No. Urspr.-PKZ-Nr. Orig.-PC

LBA80ZC rev.e Projekt/Project PKZ/PC

CA MAU 1 CCPP VIT154 Datum

Date Name Mastab

Scale N/A A4 UA/DCC Type XS00

gezeich. Drawn 2005-12-15 Heilmann Benennung/Title

Inhaltskennzeichen Contents Code

bearb. Coord. 2005-12-15 Fuchs

geprft Checked 2005-12-15 Fuchs

LBA80 Abtlg. Dept. sgd.

LP Main Steam Piping System Zhl.-Nr.

Reg.-No. Dienstst./Dept. UNID Index/Rev. Version

s AG POWER GENERATION E913 423 129 180 b

Blatt-Nr./Page-No.

CM1-L1-M-LBA80.08-810011 Erstellt mit/designed with

Ersatz fr Supersedes

Sytem-Beschreibung System Description

Projekt/Anlage: Project/Plant: Ca Mau CCPP

System System

ND-Frischdampfsystem LP Main Steam Piping System

Seiten/Pages: Anlagen/ Appendices:

7

2

VIT154 XS00 LBA80 UNID 423 129 180

Proj.-Kennz./Proj. Code UA/Doc. Inhaltskennzeichen/Contents Code

LBA80ZC rev.e PG W712, Dr. Schttler Ursprung / Original Modulverantwortlicher / Module Coordinator

Zugehrige Schaltplne/ Related P & I Diagrams:

Handhabung:Handling:

NUR FR INTERNEN GEBRAUCHFOR INTERNAL USE ONLY

VIT154 - XG02 - LBA80ZC

UNID 422 938 042 LP Main Steam

Weitergabe sowie Vervielfltigung dieser Unterlage, Verwertung und Mitteilung ihres Inhalts nicht gestattet, soweit nicht ausdrcklich zugestanden. Zuwiderhandlungen verpflichten zu Schadener-satz. Alle Rechte fr den Fall der Patenterteilung oder GM-Eintragung vorbehalten.

Siemens Power Generation

The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for damages. All rights, including rights created by patent grant or registration of a utility model or design, are reserved.

File: VIT154-XS00-LBA80-Rev-b.doc

geprft und freigegeben durch / reviewed and released by

In- dex Rev.

Datum Date

Erstellung bzw. nderungen (Seiten)

Issue resp. Modifications (Pages).

DienststelleOffice

bearbeitet durch prepared by

intern 1) Internal

extern 2) external

a 2005.12.15 Ersterstellung First Issue E913 F. Heilmann T. Fuchs B. Schobert 3)

gez. Heilmann gez. Fuchs gez. Schobert 4)

b 2006.03.30 Revision Revision E913 F. Heilmann T. Fuchs B. Schobert

Page 6 gez. Heilmann gez. Fuchs gez. Schobert

1) nur fr Modul erforderlich / only for Module required 2) nur im Projekt erforderlich / only for Project required

3) Name in Druckbuchstabe / printed 4) Unterschrift / Signature

System- Beschreibung Projekt/Anlage:Project/Plant: Ca Mau CCPP

System Description System LBA80

Seite/Page 2

Index/Revision b

Diese Unterlage unterliegt den Handhabungsvorschriften wie auf der Titelseite angegeben. Siemens Power Generation This document is subject to the handling restrictions set forth on the title page.


I Table of Contents II Systems, Abbreviations 1 Task, Function and Design 2 Modes of Operation 2.1 Preparations 2.2 Start-up and Shutdown 2.3 Operation, Closed and Open Loop Controls 3 Appendices



Seite/Page 3

Index/Revision b



II Systems, Abbreviations

Systems HAD80 Low Pressure Heat Recovery Steam Generator SystemLBA80 Low Pressure Main Steam Piping System LBG Auxiliary Steam Piping System LBH10 Start-up / Shutdown System MAC Low Pressure Steam Turbine MAG Condensing System MAN Turbine Bypass Steam PAB Circulating Water System Abbreviations

DCM Drive Control Module ESV/CV Emergency Stop Valve / Control Valve HEI Heat Exchanger Institute HP High Pressure HRSG Heat Recovery Steam Generator IP Intermediate Pressure LP Low Pressure MS Main Steam SGC Sub Group Control SLC Sub Loop Control ST Steam Turbine YFH Function Chart Overview Level



Seite/Page 4

Index/Revision b



1 Task, Function and Design

The LP main steam piping system feeds the LP part of the ST with superheated LP steam produced in the HRSGs. The superheated LP steam of the HRSGs is released to the LP main steam lines which are routed to a common header. The LP main steam line from each HRSG can be isolated by a motorized main steam shutoff valve. From the header the steam is routed via a strainer to the emergency stop valve/control valve combination of the ST. The strainer in the LP main steam line protects the steam turbine. The line to the common LP bypass station taps off from the common header up-stream of the strainer. The strainer drain line is equipped with a motor-operated shutoff valve for removal of condensate and a sludge trap for the reception of deposits. The drain and warm up line upstream ST is equipped with a motor-operated shutoff valve for warming-up. Drain and warm-up line which is routed to the HRSG start-up and shutdown system LBH is equipped with a motor-operated isolating valve for warming-up, a steam trap for removal of condensate during shutdown and a sludge trap for the reception of de-posits. Pressure and temperature measuring points are arranged on the steam line.



Seite/Page 5

Index/Revision b



2 Modes of Operation 2.1 Preparations

The ST condensing system MAG, the circulating water system PAB and the boiler start-up and shutdown system LBH have to be in operation. The LP bypass control has to be on AUTO mode. 2.2 Start-up and Shutdown

Start-up The start-up of the LP main steam piping system consists mainly of the material warm-up to avoid condensed water drops entering the turbine. A controlled warm-up of the ST emergency stop valve/control valve is not necessary owing to their low wall thickness. The HRSGs have to be taken into operation one after the other. The LP main steam shutoff valve of the steam line referring to the HRSG which shall be taken into opera-tion is opened in two steps for pressure equalization. The LP MS shutoff valve of the second HRSG stays closed. The controls of the drain and warm-up valves in the LP main steam lines are acti-vated. This means water and steam are dumped until the LP steam is sufficiently su-perheated. As soon as the steam generation commences in the LP evaporator, the pressure in the LP system increases. The LP bypass control valve begins to open under pressure control once the operating pressure is achieved. The turbine emergency stop valve opens according to the ST start-up program. The LP steam supply to the steam turbine can be started by opening of the ST control valve if the requirements for steam quality and quantity are fulfilled and the ST has been loaded to a minimum load via HP and IP main steam system. Then the turbine bypass-station closes subsequently. For start-up of the second HRSG the motorized LP main steam shutoff valve is kept closed until the target pressure of the first HRSG is met. Then the LP main steam shutoff valve of the second HRSG is opened. If the ST requirements for LP steam quality are not fulfilled before reaching the operating pressure of the first HRSG both HRSGs are taken temporarily to LP bypass operation again by reducing the LP by-pass pressure setpoint below the setpoint of the LP ST control valves until the LP steam quality requirements are met again.



Seite/Page 6

Index/Revision b



Shutdown For the shutdown of the ST, the LP turbine valves are closed. The steam that is still produced in the LP part of the HRSGs is routed via the common LP bypass station to the condenser. In case of a ST trip the LP turbine emergency stop valve is closed and the LP bypass station is opened immediately to avoid lifting of safety valves. If the LP bypass station does not open, the pressure increase is limited by safety valves in the LP part of the HRSGs. If a HRSG trips or the corresponding LP main steam shutoff valve is closed the shut-down program of the SGC LP STEAM SYSTEM will be initiated by protection signal. For isolating of one HRSG from the running power plant for repair or maintenance, the LP main steam shutoff valve and the manual HRSG isolating valve are closed, the visible drain valve between both valves has to be opened. 2.3 Operation, Closed and Open Loop Controls During normal plant operation the steam produced in the HRSGs is routed to the ST by the LP main steam piping system. Main steam piping warm-up prior to ST start-up is controlled by opening and closing of the warm-up and drain valves. Drain and Warm-up Valve Control in the LP Main Steam Piping System: The drain and warm-up valves in the LP main piping system open if the superheating drops below 15K to warm-up the LP main steam piping. The drain and warm-up valves close if the steam superheating is higher than 20K. The superheating is the difference between the actual temperature and the saturation temperature at the ac-tual pressure. These values comply to the HEI-requirements. The drain and warm-up valves are kept closed during HRSG shutdown in order to maintain the LP steam pressure and due to not allowance to lead condensate to the not evacuated condenser (MAG). Arising condensate during shutdown is removed by the steam trap in the bypass line of the motorized drain and warm-up valve (only applied for the drain- and warm-up lines which are routed to the boiler start-up and shutdown system LBH). Protection Closing of the Drain and Warm-up Valves upstream of the ST: Protection closing of the warm-up valve is performed if the superheating exceeds 30K or in case of insufficient condenser vacuum or inoperable condenser cooling. The superheating is the difference between the actual temperature and the saturation temperature of the actual pressure. Protection Closing of the LP Main Steam Shutoff Valves: If the water level of the LP drum exceeds the High High level the LP main steam shutoff valve in the referring steam line will be closed to protect the ST against water ingress.



Seite/Page 7

Index/Revision b



3 Appendices System App KKS

LP MS System Open Loop Control YFH 10LBA80DU001 LP MS SGC Overview YFH 11/12LBA80EC001

! " # #

$ % & ' (

) ) ) *

"

+ * , )

! " # $

-

M

M

M

11LBA85AA402

11LBA85AA001

12LBA85AA001

10LBA90AA402

10LBA90EE001

$ % .

CP004

10LBA90CT001

11HAY00EU001 12HAY00EU001

11LBA85CT001

$ % .

AA404

$ % .

+

$ %

/ 0

/ ! " 1 )

' " " ! !

2 + 3

" " * 4 4

' " 5 #

' "

LBA80 FA: W 1LP M AIN STEAM

+

6

*,

#

7

"#

)!

)

)

#

*)

8

)

6

,*

!

#

)

,

#

#

)

)

#

!

6

5

*

9

))

5

#

*

:8

8

#6

)

5

;

";

8

6

"!

"

)

)

7

#

,

*6

#

)

,

"

6

;

"

#

"#

)

"

#

8

"

*

!

6

6

)

#

7

"

)

0

6

: - / 8 - / ;

* # , # " < : 0 0 5

" ! 8

to LP Bypass

from HRSG 12

from HRSG 11

LP Turbine

SLC LP STM DRN & W /U

HRSG 11 STATUS HRSG 12 STATUS

! " # $ % & % ' ( % % " ) * + & , & ' *

- (

.

! " # $ % % %

% " # & % ' %

% " # & % % %

" # $ ( ' % % " # & % ' % '

! " # $ ( % %

,

- ( ! / ( - ! ( - ) / , /

,

) !

0 !

)

1

) !

/ - 2 1

)

*

+,

-

.

/-

01

0

0

-

+0

2

0

*

,+

1

-

0

,

-

-

0

0

-

1

*

3

+

4

00

3

-

+

52

2

-*

0

3

66

7

6

/7

6

2

*

/1

/

0

6

6

0

.

-

,6

+*

-

0

,

/

*

7

/

-

/-

0

/

-

2

/

+

6

1

*

6

*

0

-

.

/

0

*

1 / 8 0 9 /

/ 1 1

: ( '

/ / + ; ;

9 / 3 -

9 /

5 ! 6 2 ! 6 7 + - , - / < 5 3

/ 1 2 6

3 1

) ( - !

) !

/ -

) ! / -

/ -

) ( -

! (

vit154 xs00 lba80 rev b

Documents