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DRAWING/DOCUMENT STATUS A FOR REFERENCE 2006-04-10 First issue Steenmeyer DATE DESCRIPTION Bearb Coord Rev Liedtke Sudhoff Geprüft Checked APPD PROJECT : CAMAU 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 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 of 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 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 ... oil temperature A cooler bypass valve is used to prevent any potential cooler over-pressurization Fluid Reservoir Class: RESTRICTED The fluid reservoir, MBX01BB 001, is a steel vessel equipped with... the reservoir, passes that filter (re-circulating oil, returning A level switch, MBX01CL 001, is used for remote indication of the level A thermometer, MBX01CT 501, and double resistance temperature... 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