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

KEICHER

POWER GENERATION
DRAWING TITLE :

System Description Hydraulic Oil 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 Hydraulic Oil
System
Dienstst./Dept.

P415

UNID

423216965

XS00

MBX
Zähl.-Nr.
Reg.-No.
Index/Rev.

355023
Version


A
Blatt-Nr./Page-No.

CM1-L1-M-MBX.08-355023
Erstellt mit/designed with

0 of 2
Ersatz für
Supersedes


Gas Turbine
Description of Auxiliary Systems

Hydraulic Control Equipment
Hydraulic Oil System

Refer also to:
List of Control Settings (SREL)
List of Measuring Instruments
List of Electrical Loads
Equipment List
Specification for Hydraulic Oils
P+I Diagram, Hydraulic System

MBX01CT101, provide local and remote indication of the
reservoir fluid temperature.
3.1-0210
3.1-0220

3.1-0230
3.1-0240
3.1-0251
3.1-9010

The reservoir is equipped with a descant air filter, to
minimize moisture into Hydraulic reservoir.

Hydraulic Supply Pumps
Two AC motor-driven variable displacement pressurecompensated pumps, MBX02AP001 / MBX02AP002, are
mounted on top of the hydraulic fluid reservoir. Each pump
is capable of supplying the total requirements of the
system. One pump is normally operating with the other
acting as a standby. The operating pump can be preselected. The adjustable relief valves, MBX02AA191/
MBX02AA193, control the pumps so that the displacement
of the operating pump is automatically varied to meet the
system demand. These valves ensure a constant
discharge pressure of 160 bar (2320 psi).
Loss of
operating pump discharge pressure, detected by the
pressure transmitter MBX03CP101, will automatically start
the standby pump. The discharge lines of the two pumps
merge downstream of the supply line filters. A check valve,
MBX03AA201 / MBX03AA202, is located at the discharge
of each pump to prevent backflow through the standby
pump.

Settings, limits and measuring ranges of the items of
equipment listed here are given in the List of Measuring
Instruments, the Equipment List and the 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.

General System Description
The hydraulic supply system provides pressurized
hydraulic fluid for operation of the control actuators in the
auxiliary equipment. System components are mounted on
the hydraulic power unit (HPU).
Hydraulic fluid is contained in a reservoir, which is
equipped with instrumentation for status and protective
functions. Fluid is pumped from the reservoir by one of two
redundant pumps.
If the primary pump should fail, the standby pump will
automatically start to ensure a continuous supply of
hydraulic fluid.

Pressure
gauges,
MBX02CP501 / MBX02CP502,
provide local indication of pump discharge pressures.
Pressure relief valves, MBX02AA192 / MBX02AA194,
adjusted at 180 bar (2610 psi), are installed downstream of
the pumps to prevent impermissibly high pressures within
the hydraulic system.


Instruments are located on the skid for local monitoring
of system status.
Hydraulic fluid cleanliness is required for long-term
system reliability. The cleanliness, in accordance with ISO
Standard 4406, shall be: 17/15/12. Therefore, the system
includes continuous in-line filtration of the supply fluid as
well as the main filtering in the conditioning loop.

A check valve is located at the discharge of each pump
to prevent backflow through the standby pump.

Conditioning loop

Fluid shall be replaced every two to three years to maintain
proper lubricant additive levels. The volume of the tank is
approximately 400 liters (105 Gal). New oil shall be filled in
through the filling valve, MBX06AA252. New oil does not
normally fulfill the cleanliness requirements. Therefore, the
oil shall be circulated through the conditioning loop for a
minimum of four hours after filling. Valves,
MBX03AA251 / MBX03AA253, shall be closed during that
procedure.

Each variable displacement pump has a coupled gear
pump that continuously circulates hydraulic fluid through
the conditioning loop, that means from the reservoir,
through the oil-air cooler, MBX06AH001, then through the
main filter and back to the reservoir. This ensures the
required cleanliness and temperature range.

The fan of the cooler provides airflow that cools the
hydraulic oil inside the finned tubes. Operation of the fan is
thermostatically controlled by resistance thermometer
MBX01CT101, which senses reservoir oil temperature. A
cooler bypass valve is used to prevent any potential cooler
over-pressurization.

Fluid Reservoir

Class: RESTRICTED

The fluid reservoir, MBX01BB001, is a steel vessel
equipped with measuring instruments.

The main filtering is performed in the conditioning loop
by filter MBX06AT003; the filter element is designed to
meet a 3 µm (3 micron) absolute rating. Oil, which enters
the reservoir, passes that filter (re-circulating oil, returning

A level switch, MBX01CL001, is used for remote
indication of the level. A thermometer, MBX01CT501, and
double
resistance
temperature
device
(RTD),

Siemens AG
Power Generation


3.1-9000-9074/1
MBX

0105E-X


Gas Turbine
Description of Auxiliary Systems

Hydraulic Control Equipment
Hydraulic Oil System

oil and oil which is filled in through valve MBX06AA252).
This reliably ensures that no debris enters the system.
Filter
differential
MBX06CP002.

pressure

is

monitored

During operation the standby pump can be switched off
manually after reaching the upper value of pressure
threshold P.Hyd.02, e. g. 150 bar (2175 psi).

−


High pressure is indicated, if pressure exceeds
threshold P.Hyd.05, e.g. 170 bar (2465 psi).

Pressure gauge, MBX06CP501, is located upstream of
the air-cooled heat exchanger and gives a local indication
of loop pressure.

The discharge pipe of each pump is equipped with
supply line filter MBX03AT001 / MBX03AT002. Filter
elements have a 10 µm (10 micron) absolute rating.
Pressure
differential
switches,
MBX03CP0001/
MBX03CP002, provide remote and local indications for
visual observation of filter cleanliness status. Since the
supply line filters are intended to function simply as a
protective device, they are subjected to little fouling during
service. If the set point of at least one of the two differential
pressure switches is exceeded for more than 10 minutes,
the pre-trip alarm "Hydraulic oil filter fouled" is indicated.

Temperature Monitoring
For optimum operation of the hydraulic actuators it is
necessary to keep the oil within the optimum viscosity
range. The viscosity depends on the oil and on the
temperature. Therefore, the oil is to be heated or cooled
according to requirements. During operation, only cooling
is necessary, which is realized by the air-oil-cooler. During
standstill, the oil is heated by operation of one pump, if the

temperature falls below a certain threshold. The signal of
the RTD is used for:

When one filter element is being changed, the other
pump has to assume the task of supplying hydraulic oil.
Valves MBX03AA251and MBX03AA252 or MBX03AA253
and MBX03AA254 can individually isolate the filters.

Accumulators
Two
bladder
accumulators,
MBX04BB001/
MBX04BB002, are connected to the discharge downstream
of the supply filters. The accumulators are charged with
nitrogen to a pressure of 100 bar (1450 psi).
with a
shutoff
valve,
valve,

−

Activating heating via pumps during standstill when
temperature falls below threshold T.HYD.01, e.g. 20 °C.

−

Deactivating heating via pumps during standstill when
temperature exceeds threshold T.HYD.02, e.g. 25 °C.


−

Switching the cooler on when temperature exceeds
threshold T.HYD.04, e.g. 55 °C.

−

Switching the cooler off when temperature falls below
threshold T.HYD.03, e.g. 45 °C.

−

Indicating high temperature at threshold T.HYD.05, e.g.
70 °C.

−

Indicating low temperature at threshold T.HYD.06, e.g.
10 °C.

Level Monitoring

The design of the accumulators assumes rapid and
sudden controlled positioning of the actuators, concurrent
with the failure of the operating pump and an initiated pump
changeover from operating pump to standby pump.

Switching point MBX01CL001-S01 indicates low;
switching points MBX01CL001-S02 and MBX01CL001–

S03 indicate too low level. A level gauge, MBX01CL501,
provides local indication of the level. If the oil level in the
tank drops below at least two of the limits, MBX01CL001S01, MBX01CL001-S02 or MBX01CL001-S03 (2-of-3
logic), a trip is initiated.

Pressure Monitoring
Class: RESTRICTED

−

Pressure gauge, MBX03CP501, senses and displays
hydraulic power unit discharge pressure to the system.

Supply Filters

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.

The standby pump is additionally switched on if the
pressure drops below the lower value of pressure
threshold P.Hyd.02, e. g. 145 bar (2103 psi ).

by

The conditioning loop may be isolated by closing valve
MBX06AA251. Oil then flows directly back into the tank
through the check valves, MBX06AA191 / MBX06AA192,

which function as pressure relief valves and limit the gear
pump discharge pressures. This isolation of flow is required
prior to performing filter element replacement.

Each hydraulic oil accumulator is provided
pressure gauge, MBX04CP501 / MBX04CP502, a
valve,
MBX04AA251 / MBX04AA252,
drain
MBX04AA401 / MBX04AA402,
and
safety
MBX04AA191 / MBX04AA192, respectively.

−

Pressure transmitter, MBX03CP101, monitors hydraulic
power unit discharge pressure directed to the system.
Dependent of the signals of the pressure transmitter:
−

The standby pump is switched on during the start-up of
the GT, in addition to the operating pump.

Siemens AG
Power Generation

3.1-9000-9074/2
MBX


0105E-X