31 9200 9073 e 2004 10

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 POWER GENERATION DRAWING TITLE : System Description Hydraulic Oil For Natural Gas Valves 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 For Natural Gas Valves Dienstst./Dept P415 UNID 455472186 XS00 MBX Zähl.-Nr Reg.-No Index/Rev 355024 Version A Blatt-Nr./Page-No CM1-L1-M-MBX.08-355024 Erstellt mit/designed with of Ersatz für Supersedes Hydraulic Control Equipment Hydraulic Oil for Natural Gas Valves Gas Turbine Description of Auxiliary Systems Refer also to: List of Control Settings List of Measuring Instruments List of Electrical Loads Equipment List P+I Diagram, Natural Gas Hydraulic Oil System P+I Diagram, Hydraulic Oil P+I Diagram, Hydraulic Oil for Natural Gas Valves 3.1-0210 3.1-0220 3.1-0230 3.1-0240 3.1-5010 3.1-9000 3.1-9010 NG DM CV/ESV NG ESV NG PM CV/ESV 3.1-9110 Settings, limits, and measuring ranges of the devices referred to here are given in the List of Measuring Instruments, Equipment List, and List of Control Settings (SREL) This description only gives guideline values NG PG CV/ESV Figure 1: VX4.3A Natural Gas Valves 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 Overview The KKS identifiers of the control and emergency stop valves and the respective function levels of the associated actuators, measuring and control devices are listed in Table This description covers the actuators of the safety shutoff devices (emergency stop valves) and the control valves in the natural gas system The valve actuators essentially comprise the hydraulic cylinder and the associated control devices that are integrated into the actuator housing This results in compact actuator units Valve The control devices on these valves have the task of positioning and switching the valves by controlling the flow of hydraulic oil supplied to the valve actuators as appropriate to conditions prevailing in the various operating modes of the gas turbine NG DM CV/ESV NG PM CV/ESV NG PG CV/ESV NG ESV The configuration of the emergency stop and control valves is illustrated in Fig 1, their designations are as follows: MBP21AA151 MBP22AA151 MBP23AA151 MBP13AA051 Function level Actuator devices MBX80 MBX81 MBX82 MBX70 Table 1: KKS Designations Assigned − NG PM CV/ESV: Natural gas premix control valve with emergency stop function Valve Actuators, General (MBX70/80/81/82AS002) − NG DM CV/ESV: Natural gas diffusion control valve with emergency stop function The basic configuration of the actuators of control and emergency stop valves is identical − NG PG CV/ESV: Natural gas pilot gas control valve with emergency stop function − NG ESV: Natural gas emergency stop valve The actuator is mounted on the valve stem flange It comprises a hydraulic cylinder and a Belleville spring stack which closes the valve and is integrated into the actuator unit The piston area is identical in the two cylinder plenums and pressure is applied from one side only The valve can only be opened when the actuator is supplied with hydraulic fluid under pressure The Belleville spring stack in the actuator applies the force required to close the valve A common emergency stop valve is installed upstream of these three control valves (see Fig 1) Each pair of shutoff valves connected in series constitutes a dual element shutoff device Class: RESTRICTED KKS Control/emergency stop valve Two inductive position sensors (MBP21/22/23AA151B01/-B02) are mounted on the piston rod of each control valve actuator The control system proper—i.e., speed control, load control, temperature limit control, startup and shutdown control, together with the hydraulic oil supply station required for the valve actuator units—is described elsewhere The OPEN and CLOSED positions of emergency stop valve MBP13AA051 are each monitored by two inductive Siemens AG Power Generation 3.1-9200-9073/1 MBX 1004E-X Gas Turbine Description of Auxiliary Systems Hydraulic Control Equipment Hydraulic Oil for Natural Gas Valves position limit switches located in the actuator unit (MBP13AA051-S11, -S12, -S21, and -S22) positioning signal to the servo valve in the form of a loadindependent current, which changes the flow of hydraulic oil from the oil supply station at a level proportional to the signal current, but with a high amplification Control devices are implemented in the actuator housings in line with the respective task requirements and are explained in the following A positive current at the controller output opens the control valve and a negative current closes it The greater the current, the more rapidly the control valve opens or closes Control Devices, General (MBX70/80/81/82AS001) The hydraulic settings of the servo valve are such that in the event of loss of current signal (e.g., broken wire) the control valve always assumes its “CLOSED” position Each of the control devices is connected to the hydraulic oil supply station by one supply and one return line To open the valve, hydraulic oil is supplied to the lower plenum via the metering edges of the second stage Upward piston travel compresses the closing spring and displaces the hydraulic fluid from the upper plenum into the return line to the tank 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 Each control device is protected by a dedicated pressure filter (MBX70/80/81/82AT002) An optical fouling display (MBX70/80/81/82CP502) is provided to monitor fouling of each filter If fouling of a given filter causes pressure to exceed a certain level, this is indicated by a change in color To close the valve, oil is routed via the metering edges of the second stage from the lower plenum to the upper plenum and/or return line to the tank The valve disk is actuated in the close direction by spring force, displacing hydraulic oil from the lower plenum through the servo valve and into the upper plenum and/or the return line to the tank Actuator piston travel is registered by non-contact displacement sensors MBP21AA151B0/-B02 and MBP22AA151-B01/-B02 Theses sensors each output an analog current signal that is fed back to the position controller as the actual position Of these output signals, the maximum value is used for control actions The actuator control devices provided for the natural gas diffusion and natural gas premix control valves (NG DM CV and NG PM CV) are identical and are described collectively Control Devices of the Natural Gas Diffusion and Premix Control Valve (MBX80AS001/MBX81AS001) The respective control devices of the natural gas control valve actuators MBP21/22AA151 essentially comprise the servo valve (MBX80AA101/MBXA81AA101), the 2-way cartridge valve (MBX80AA052/MBX81AA052), the solenoid-type pilot valve (MBX80AA002/MBX81AA002) as well as the measuring points MBX80CP401 to MBX80CP404 and MBX81CP401 to MBX81CP404 and the pressure filter MBX80AT002/MBX81AT002) The control valves are a component of the natural gas system dual element shutoff device In addition to controlling the amount of natural gas supplied, the latter is also used to rapidly and reliably stop the fuel mass flow to the burners when necessary Closure of the control valve on trip is triggered by deenergizing the respective solenoid-type pilot valve MBX80/81AA002 (deenergize-to-trip principle) Deenergizing the solenoid-type pilot valve depressurizes the lower plenum, allowing the Belleville spring stack to rapidly close the emergency stop valve Control oil acting on the actuator piston of the 2-way cartridge valve flows back to the tank in the depressurized condition Hydraulic oil pressure generated by the Belleville spring stack (MBX80/81AS002) in the hydraulic cylinder opens the spring-loaded control piston of the 2-way cartridge valve and the hydraulic oil in the lower plenum then flows through the 2-way cartridge valve into the depressurized space above the piston (upper plenum) The spring force of the preloaded closing springs acting on the control piston is so low that only a slight pressure differential between connections A and B is required to hold the 2-way cartridge valve closed Consequently the 2-way cartridge valve is capable of switching large oil flows at low pressure drop, thus ensuring that the control valve actuator achieves short Class: RESTRICTED During normal operation the respective solenoid-type pilot valve MBX80AA002 or MBX81AA002 is energized As a result, the upper plenum of the spring-loaded control piston in the 2-way cartridge valve (MBX80AA052/MBX81AA052) is pressurized, thus closing the 2-way cartridge valve and preventing the flow of hydraulic fluid from the drain in the lower plenum of the actuator through the 2-way cartridge valve and into the upper plenum and/or into the return line to the tank In this condition, actuator piston travel can be controlled by the two-stage servo valve MBX80AA101/MBX81AA101 This servo valve has two stages, the first comprising a hydraulic preamplifier and the second a hydraulic power amplifier The valve actuator, together with the control device, is an integral component of the control loop The position controller of the gas turbine I&C system sends a Siemens AG Power Generation 3.1-9200-9073/2 MBX 1004E-X Gas Turbine Description of Auxiliary Systems Hydraulic Control Equipment Hydraulic Oil for Natural Gas Valves closure times The Belleville spring stack reliably closes the control valve (deenergize to close principle) On deenergization of the solenoid-type pilot valve, the lower plenum is depressurized, causing the closing spring to rapidly close the emergency stop valve In the event of trip hydraulic fluid in the lower plenum flows through the solenoid-type pilot valve into the depressurized space above the piston (upper plenum) and/or into the return line to the tank Control Device of the Pilot Gas Control Valve (MBX82AS001) The control device MBX82AS001 associated with the actuator of the pilot gas control valve MBP23AA151 essentially comprises servo valve MBX82AA101, solenoidtype pilot valve MBX82AA002, pressure filter MBX82AT002, and measuring points MBX82CP401/402/404 Control Devices of the Emergency Stop Valve (MBX70AS001) The control devices of the emergency stop valve actuator essentially comprise solenoid-type opening valve MBX70AA031, 2-way cartridge valve MBX70AA051, solenoid-type pilot valve MBX70AA001, pressure filter MBX70AT002, as well as measuring points MBX70CP401/402/403/404 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 During normal operation solenoid-type pilot valve MBX82AA002 is energized This prevents the oil in the lower plenum from draining through the solenoid-type pilot valve into the upper plenum and/or into the return line to the tank To open the emergency stop valve, solenoid-type pilot valve MBX70AA001 and solenoid-type opening valve MBX70AA031 are energized, the latter with a slight delay Servo valve MBX82AA101 controls actuator piston travel It comprises a pilot stage with a torque motor and hydraulic preamplifier and a second stage with four metering edges By energizing solenoid-type pilot valve the upper plenum of the spring-loaded piston in the cartridge valve is pressurized, thus closing the cartridge valve and preventing the flow of hydraulic fluid from the drain in the lower plenum of the actuator through the cartridge valve and into the upper plenum and/or into the return line to the tank The valve actuator, together with the control device, is an integral component of the control loop The position controller sends a positioning signal to the servo valve in the form of a load-independent current, which changes the flow of hydraulic oil from the oil supply station at a level proportional to the signal current, but with a high amplification Subsequent energization of solenoid-type opening valve supplies hydraulic fluid to the lower plenum Upward piston travel compresses the closing spring and displaces the hydraulic fluid from the upper plenum into the return line to the tank A positive current at the controller output opens the control valve and a negative current closes it The greater the current, the more rapidly the control valve opens or closes Closure of the emergency stop valve in the event of trip is triggered by deenergizing solenoid-type pilot valve (deenergize to close principle) The hydraulic settings of the servo valve are such that in the event of loss of current signal (for example, due to a broken wire) the pilot gas control valve always assumes its OPEN position Deenergizing the solenoid-type pilot valve depressurizes the lower plenum, allowing the Belleville spring stack to rapidly close the emergency stop valve Control oil acting on the actuator piston of the 2-way cartridge valve flows back to the tank in the depressurized condition Hydraulic oil pressure generated by the Belleville spring stack MBX70AS002 in the hydraulic cylinder opens the spring-loaded control piston of the 2-way cartridge valve and the hydraulic oil in the lower plenums flows through the 2-way cartridge valve into the depressurized space above the piston (upper plenum) Class: RESTRICTED To increase control valve lift, hydraulic fluid is directed across the metering surface of the second stage into the lower hydraulic cylinder plenum Upward piston travel compresses the closing spring and displaces the hydraulic fluid from the upper plenum back into the tank The closing force of the actuator is generated by the closing spring, i.e., the servo valve is actuated such that hydraulic oil is displaced by spring force from the lower to the upper plenum via the servo valve Actuator piston travel is registered by the two non-contact displacement sensors MBP23AA151-B01/-B02 Theses sensors output an analog current signal that is fed back to the position controller as the actual position Of these output signals, the maximum value is used for control actions The spring force of the preloaded closing springs acting on the control piston is so low that only a slight pressure differential between connections A and B is required to hold the 2-way cartridge valve closed Consequently the 2way cartridge valve is capable of switching large oil flows at low pressure drop, thus ensuring that the emergency stop Closure of the control valve on trip is triggered by deenergizing solenoid-type pilot valve MBX82AA002 Siemens AG Power Generation 3.1-9200-9073/3 MBX 1004E-X Gas Turbine Description of Auxiliary Systems Hydraulic Control Equipment Hydraulic Oil for Natural Gas Valves valve actuator achieves short closure times The Belleville spring stack reliably closes the emergency stop valve When trip is triggered, the solenoid-type pilot valve and solenoid-type opening valve are simultaneously 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 the deenergized This interrupts the connection to the pressure line Fail-safe, rapid closure of the valve is ensured by deenergization of the solenoid-type pilot valve alone Siemens AG Power Generation 3.1-9200-9073/4 MBX 1004E-X ... valve opens or closes Closure of the emergency stop valve in the event of trip is triggered by deenergizing solenoid-type pilot valve (deenergize to close principle) The hydraulic settings of the... valve (deenergize to close principle) On deenergization of the solenoid-type pilot valve, the lower plenum is depressurized, causing the closing spring to rapidly close the emergency stop valve... closure times The Belleville spring stack reliably closes the emergency stop valve When trip is triggered, the solenoid-type pilot valve and solenoid-type opening valve are simultaneously Class: RESTRICTED