DRAWING/DOCUMENT STATUS

A

FOR REFERENCE

2006-04-10

First issue

Steenmeyer

DATE

DESCRIPTION

Bearb.
Coord.

Rev.

Liedtke

Sudhoff

Geprüft
Checked

APPD.

PROJECT :

CAMAU 1 750MW COMBINED CYCLE POWER PLANT
OWNER :

OWNER’S ENGINEER :

PETRO VIETNAM
CPMB
CONTRACTOR :

CONTRACTOR’S ENGINEER :

LILAMA CORPORATION

FICHTNER

SUBCONTRACTOR’S NAME :

SUBCONTRACTOR’S SUPPLIER :

s

MCE

POWER GENERATION
DRAWING TITLE :

System Description Drainage System
PKZ


UAS

Contents Code

Ursprung/Original

Reg. No.

UNID

Urspr.-PKZ-Nr.
Orig.-PC

Ursprung-Nr./Original-No.

Projekt/Project

gezeich.
Drawn
bearb.
Coord.
geprüft
Checked

Abtlg.
Dept.

PKZ/PC

Datum

Date

Name

06-04-10

STEENM

06-04-10

LIEDTKE

06-04-10

SUDHOFF

P415

sgd.

s AG
POWER GENERATION

CA MAU 1 CCPP

VIT154

Maßstab
Scale


UA/DCC
Type
Inhaltskennzeichen
Contents Code

N/A

A4

Benennung/Title

System Description Drainage
System
Dienstst./Dept.

P415

UNID

423217016

XS00

MBA
Zähl.-Nr.
Reg.-No.
Index/Rev.

355018
Version


A
Blatt-Nr./Page-No.

CM1-L1-M-MBA.08-355018
Erstellt mit/designed with

0 of 2
Ersatz für
Supersedes


Gas Turbine
Description of Auxiliary Systems

Compressor and Turbine / GT Bearings
Drainage System

Refer also to:
List of Control Settings (SREL)
List of Electrical Loads
Equipment List
P+I Diagram, Drainage System
P+I Diagram, Blowoff System
P+I Diagram, Turbine Cooling

Configuration
3.1-0210
3.1-0230
3.1-0240

3.1-1210
3.1-1410
3.1-2010

Cleaning fluid is drained off at the following gas turbine
locations:
No.
1
2
3
4
5
6
7
8
21
22
23
24
25
26

Settings, limits and measuring ranges of the devices
listed here are given in the List of Measuring Instruments,
Equipment List and List of Control Settings (SREL). This
description only gives guideline values.

The reproduction, transmission or use of this document or its
content 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.

Functions
Cleaning fluid sprayed into the compressor during the
cleaning operation collects at several locations in the gas
turbine. This fluid is removed via the drainage system
before the gas turbine is restarted.

Danger!
Risk of scalding! The compressor cleaning
operation and also the subsequent draining
operation are performed manually. I.e. the
switches and valves must be operated by
hand. It is absolutely imperative that all the
valves opened during the draining operation
be closed once draining has been
completed. If they are not closed, hot gases
will escape from the drainage piping and
equipment may be damaged or persons
injured. In addition, crosscurrent flow may
occur between the individual gas turbine
drain connections.

Gas Turbine Location
Compressor stage 0
Compressor stage 9
Compressor stage 13
Compressor outlet
Turbine stage 2

Turbine stage 3
Turbine stage 4
Extraction ring E1/A1 stage 5
Compressor stage 5 blowoff line
Compressor stage 9 blowoff line
Compressor stage 5 cooling air line
Compressor stage 9 cooling air line
Compressor stage 13 cooling air line
Compressor stage 13 cooling air line

Pipes connect these locations to header MBA25BB001.
The shutoff valves in these lines must be opened manually
to drain cleaning fluid and then closed after completion of
draining. Cleaning fluid must be routed from header
MBA25BB001 via connection 30A and a hose line to a
disposal tank, the latter of which must be supplied locally.
The header only has a small volume and therefore cannot
function as a collecting vessel. For this reason it must be
ensured that the cleaning fluid can freely flow from the
header into a disposal tank at all times. A venting nozzle
prevents the buildup of pressure in the collecting tank.
When cleaning the compressor, some of the cleaning
fluid flows to the lowest point of the compressor intake
structure which is not depicted in the P+ID. This lowest
point is connected to the disposal tank via a duct which has
no shutoff valve. Instead the duct contains a hydraulic seal
which must be filled with water before the gas turbine is
started up. During operation of the gas turbine this
hydraulic seal prevents the subatmospheric pressure that
prevails upstream of the compressor from drawing air in

the disposal tank into the compressor.

Class: RESTRICTED

The shutoff valves of the blowoff system drains and
also those of the turbine cooling system drains are
depicted in the drainage system P+ID.

Siemens AG
Power Generation

3.1-1200-9070/1
MBA/MBO

1203E-X


Gas Turbine
Description of Auxiliary Systems

Compressor and Turbine / GT Bearings
Drainage System

Fuel Oil Drainage System
When the gas turbine is started on liquid fuel (fuel oil),
the latter is injected into the combustion chamber during
the ignition phase. In the event that the flames do not ignite
immediately on startup with fuel oil⎯or if they initially light
and then extinguish⎯fuel oil may precipitate on the
combustion chamber walls. This uncombusted fuel oil must

be drained off before the gas turbine is restarted. Draining
is achieved via the same pipe connection at the
compressor outlet that is used to drain the spent cleaning
fluid after cleaning the turbine or compressor.

These solenoid valves remain in their drainage settings
during standstills or turning gear operation to allow any
uncombusted oil that collects to drain off. For this purpose,
these two solenoid valves are always actuated to their oil
drainage setting at speeds below S.TURB.05 (for example
5% rated speed). 3-way valve MBA22AA001 then has the
setting “A-C open; B closed” and solenoid valve
MBA22AA002 is open.
Solenoid valve MBA22AA002 is closed in one of the
first steps of the fuel-independent startup program. During
a start with fuel oil, the 3-way valve is actuated such that
the fuel oil drain is open (A-C open; B closed) as it cannot
be ascertained in advance whether the start will be
successful or aborted. These solenoid valve settings
ensure that any fuel oil which may collect does not enter
the water drainage system and no hot air can escape from
the fuel oil drainage system. In the case of a fault-free start,
the 3-way valve is actuated to its drain setting “A-B open; C
closed” when flames are detected in the combustion

Fuel oil is injected without formation of flames. If this
type of failed start occurs, the absence of a signal from the
flame monitor keeps the 3-way valve in its fuel oil drainage
setting.
Fuel oil is injected, flames initially form, however they

subsequently extinguish. This type of failed start is always
followed by GT trip. When flames extinguish, the 3-way
valve receives the signal “Flame out” from the flame
monitor and is returned to the fuel oil drainage setting.
Each time the gas turbine is shut down, including after
failed starts, both solenoid valves are energized, i.e.
actuated to their oil drainage settings, when speed drops
below S.TURB.21 (for example 25% rated speed). After a
failed start, oil flows via connection 111A into the used oil
disposal tank. At speeds below S.TURB.21 it is ensured
that pressure does not become excessive when draining oil
from the combustion chamber and thus that oil and air
cannot flow into the leakage oil tank at an impermissibly
high velocity. To ensure that all uncombusted oil collecting
after a failed start has sufficient time to drain out of the
combustion chamber, it is not possible to restart the gas
turbine until monitoring period K.ENTOEL.01 (for example
5 minutes) has elapsed.
Wastewater that accumulates during compressor
cleaning must be drained off. To do this, solenoid valves
MBA22AA001 and MBA22AA002 must be manually
actuated to their drain settings. At speeds below
S.TURB.05 (for example 5% rated speed) these solenoid
valves can be actuated manually.
These solenoid valves are equipped with limit switches.
If none of the solenoid valves are in the drain setting during
operation at high speed (>S.TURB.21) the protection
system alarm “Fuel oil drainage valve not closed” is issued
and overall trip is triggered.


Class: RESTRICTED

The reproduction, transmission or use of this document or its
content 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.

Three-way solenoid valve MBA22AA001 is used to
route fluid from this drain, either to shutoff valve
MBA22AA251 or to a drain pipe equipped with solenoid
valve MBA22AA002. The fuel oil must be fed from
connection 111A into a disposal tank for used oil (supplied
locally). This tank must have provision for continuous
venting since air can also escape at connection 111A.

chamber. A distinction is made between two types of failed
start:

Siemens AG
Power Generation

3.1-1200-9070/2
MBA/MBO

1203E-X