31 1500 9070 e 2004 01

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 PARKER POWER GENERATION DRAWING TITLE : System Description Hydraulic Clearance Optimization 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 Clearance Optimization Dienstst./Dept P415 UNID 423216989 XS00 MBX98 Zähl.-Nr Reg.-No Index/Rev 355062 Version A Blatt-Nr./Page-No CM1-L1-M-MBX98.08-355062 Erstellt mit/designed with Ersatz für Supersedes of Gas Turbine Description of Auxiliary Systems Compressor and Turbine / GT Bearings Hydraulic Clearance Optimization (HCO) Furthermore, the flushing operation constitutes a function test of the bladder accumulator and instrumentation Refer also to: List of Control Settings (SREL): List of Measuring Instruments List of Electrical Loads Equipment List Gas Turbine Instrumentation P+I Diagram Gas Turbine P+I Diagram, Hydraulic Clearance Optimization Lube and Jacking Oil System P+I Diagram, Lube and Jacking Oil 3.1-0210 3.1-0220 3.1-0230 3.1-0240 3.1-1000 3.1-1010 3.1-1510 3.1-8000 3.1-8010 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 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 Function An efficiency improvement and output increase can be achieved if the GT rotor is shifted against the direction of flow This reduces clearances between the turbine blades and casing, in the compressor the corresponding clearances are increased By virtue of the gas turbine’s mechanical design the losses in the compressor caused by this are lower than the improvements in the turbine This shifting operation may only be performed when the GT has thoroughly warmed up To achieve this, the design of thrust bearing permits axial displacement when a hydraulic system supplies fluid to corresponding cylinders; axial stops limit rotor displacement in in the primary displacement direction and in the secondary displacement direction Class: RESTRICTED The operating pressure of max 180bar is generated by a separate hydraulic supply system Axial displacement must be performed slowly to prevent excessive mechanical loadings on the structural elements of the bearing Defined displacement times can only be achieved when the hydraulic system is vented, for this reason the system must be completely filled with hydraulic fluid (lube oil) the thrust bearing for each displacement direction is provided with a supply and a return line To keep pump loadings at low levels and prevent rapid fouling of the filter, the return line is shut off so that oil cannot continuously ciruculate in the hydraulic clearance optimization (HCO) system To permit replacement of hydraulic fluid and prevent excessive warming, a flushing operation is performed during operation of the GT to regularly replace hydraulic fluid in the HCO thrust bearing that is activated at that time This also displaces any trapped air bubbles or solid contamination caused by abrasion of the HCO piston seals Configuration The HCO supply unit comprises a base frame on which two 100% pumps, a hydraulic bladder accumulator, and the HCO control block and associated instrumentation are mounted The operating medium is lube oil taken from the supply line of the lube oil system Lube oil is returned from this hydraulic system to the lube oil tank To achieve the requisite operating pressure on the order of 160 to 180bar, two gear pumps (MBA51AP001/002) are provided that are driven by AC motors; these pumps are protected by a safety valve (MBA51AA191) Other than during the pump test which is performed once when the HCO system is started up, only one pump is intermittently in operation to charge the bladder accumulator MBA51BP001 A given pump can be selected via the I&C system Changeover to the other pump is made in the event of a fault to the pump that is selected Each of these pumps is capable of maintaining the operating pressure in the event of a loss of accumulator function or failure of the HCO piston chamber return line shutoff element To perform the principal task of permanently supplying oil to the primary and secondary piston chambers of the HCO thrust bearing, a bladder accumulator with corresponding accumulator safety block MBA51AA193 is provided on the HCO supply station This accumulator is charged by the above-mentioned pumps and can be isolated from the system using shutoff valve MBA51AA255 and relieved via drain valve MBA51AA257 A manually-actuated shutoff valve (MBA51AA251 and MBA51AA252, respectively) is provided upstream of each pump to permit inspection and maintenance work Each of these vavles is equipped with a position limit switch for monitoring the valve setting OPEN These pumps shall only be started up when the corresponding valve is open To protect the flow control valves, oil is cleaned by filter MBA51AT001 located downstream of the pumps Filter fouling is monitored by differential pressure switch MBA51CP003 A pretrip alarm is annunciated if response of this switch persists for longer than seconds 2/2-way solenoid-type seat valves (MBA53AA001 to 006) are provided in the supply and return lines of the primary and secondary displacement directions to enable pressurizing and relieving of the primary and secondary displacement direction pistons The following flow control valves are installed to ensure that the permissible axial shaft displacement times are achieved: MBA53AA152 and MBA53AA153 downstream of the solenoid valves in the Siemens AG Power Generation 3.1-1500-9070/1 MBA / MBD 0104E Gas Turbine Description of Auxiliary Systems Compressor and Turbine / GT Bearings Hydraulic Clearance Optimization (HCO) chamber and MBA53CP103/104 in the return line from the secondary displacement piston chamber These pressure sensors can be used to monitor pressure in the respective piston chambers In the interest of availability, these pressure sensors are redundant supply line to the respective HCO piston chamber and MBA54AA154 and MBA54AA155 upstream of the solenoid valves in the return lines Both the solenoid valves and the control valves are located in a single overall control block mounted on the supply station Pressure limiting valves MBA54AA151 and MBA54AA152 are provided to guard against impermissible pressure increases in the piston chambers of the HCO bearing; in the event of a fault these valves route oil directly into the lube oil tank A sight glass (MBA51CF501) is installed in the common return line of the HCO supply station that leads to the tank Position Transducers The overall control block also includes the pressure limiting valve (MBV53AA154) and the associated shutoff valve (MBV53AA251), which are used during initial filling of the system Two analog position transducers (MBA10CG101/102) are installed on the compressor bearing cover These transducders permit detection of the (axial) rotor shaft position and measurement of the displacement of the shaft caused by the HCO system In the interest of availability, redundant transducers are provided These position transducers are not depicted in the P+ID of the hydraulic clearance optimization system supply station 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 Pressure transducers MBA51CP101 und MBA51CP102 are used to register HCO system pressure in the common line upstream of the solenoid valves In the interest of availability, these are redundant Pressure gauge MBA51CP501 is provided for checking system pressure locally Pressure transducers MBA53CP101/102 are located in the return line from the primary displacement piston Sub-distribution Motor and pump Pressure transducer Pressure gauge Pressure transducer Class: RESTRICTED Base frame HCO control block Bladder accumulator Fig + 2: HCO supply unit comprises Siemens AG Power Generation 3.1-1500-9070/2 MBA / MBD 0104E ... reduces clearances between the turbine blades and casing, in the compressor the corresponding clearances are increased By virtue of the gas turbine’s mechanical design the losses in the compressor... structural elements of the bearing Defined displacement times can only be achieved when the hydraulic system is vented, for this reason the system must be completely filled with hydraulic fluid (lube... utility model or design, are reserved Pressure transducers MBA51CP 101 und MBA51CP102 are used to register HCO system pressure in the common line upstream of the solenoid valves In the interest of