【正文】 ondition Pressure MPa(a) HP steam LP steam Temperature ℃ Flow t/h presure MPa(a) Temperature ℃ Cold reheat Four stage extraction *1 *1 *1 flow t/h Load Item *2 Steam source 75%VWO flow condition *2 50%VWO 25%VWO flow flow condition condition presure Mpa(a) HP steam Temperature ℃ flow t/h Cold reheat *1 *1 *1 presure MPa(a) Four stage LP steam Temperature ℃ extraction flow t/h The parameters in the table are those before the main stop valve of BFPT unless otherwise noted. Auxiliary steam for missioning and startup: ~ MPa (a), 300~380℃ , flow: t/h *1: HP steam is not applicable during normal operation. *2: High Back Pressure / Low Back Pressure Installation and operation condition Turbine driven feedwater pump unit is arranged in the turbine house and its operation level is 17m. Two turbine driven feedwater pump unit for each unit adopt the same 3 February 2020 XXXX Power Plant 4 1000MW Ultrasupercritical Unit Feed Water Pump Turbine Contract Document Volume 3 Technical Specification direction arrangement. Condenser backpressure Double backpressure under VWO condition: (a) Double backpressure under Summer condition: (a) Steam of BFPT is discharged to: down into main turbine condenser Cooling water: Cooling water quality: demineralized water Cooling water temperature: design temperature: 25 , maximum temperature: 38℃ Cooling water pressure: ~ MPa(g) Quality of steam entering turbine: Index Unit Value 1 Sodium ppb ＜ 5 2 3 4 5 Silicon dioxide conductivity（ 25℃ ） Iron copper ppb 181。h N/A N/A Steam exhaust quantity Exhaust temperature Exhaust enthalpy t/h ℃ kJ/kg 2489 Main unit condition Name Unit 75%VWO flow condition 50%VWO flow condition 25%VWO flow condition Pressure Mpa(a) LP steam Temperature ℃ Flow t/h Back pressure RPM Relative internal efficiency Mechanical loss Output power kPa(a) r/min % kW kW 5190 100 10655 4160 100 5073 3070 100 1802 Steam consumption kg/kWh N/A N/A Steam exhaust quantity Exhaust temperature Exhaust enthalpy t/h ℃ kJ/kg Main unit condition Name Unit 75%VWO flow condition 50%VWO flow condition 25%VWO flow condition Pressure Mpa(a) LP steam Temperature ℃ Flow t/h Back pressure RPM Relative internal efficiency Mechanical loss Output power kPa(a) r/min % kW kW 5190 100 10655 4160 100 5073 3070 100 1802 Steam consumption kg/kW load caused by safety valve steam exhaust etc. Unit design (such as rotor, blade, casing, bearing etc) will meet the requirement of abrupt load change and rapid start. Moving blade design will withstand the operation at resonance frequency at the time of normal warming up. Bearing design will prevent occurrence of oil film whipping and be easily taken out for replacement and adjustment without the need of lifting out casing and rotor. On the bearing base, the position and space for site installation of measuring and test devices will be reserved. Unit design will be sufficiently considered to prevent accidental overspeed, fire and abrupt vibration. Sufficient measure shall be considered if cold steam admission, cold water inflow occur. Wet steam in any stage of feedwater pump turbine will be limited to the minimum range and blade will adopt appropriate technology to improve erosion protection. Other parts of feedwater water pump turbine subject to erosion will also be provided with protection measure. Measure will be taken to prevent ablation of blade stellite. Pipes and parts feedwater pump turbine steam seal system and vacuum system will be sized according to 300% of calculated clearance leakage. Feedwater pump turbine will be provided with protection measures to protect atmospheric relief valve against damage due to pressure rise of exhaust casing and condenser. Feedwater pump turbine will be equipped with turning gear and its control system. Turning gear will be automatically engaged or disengaged, and stop operation when feedwater pump turbine has no lube oil. Shaft vibration peak value (horizontal radial and vertical radial) measured on the bearing (not bearing base) will be less than . Noise value measured at the point 1m from housing will not exceed 85dB(A). Submission of technical documents concerning connection (including coupling) between feedwater pump turbine and feedwater pump and shafting issues (. vibration, startup, turning speed, variousstage critical speed etc.). as well as turbine driven feedwater pump unit equipment assembly drawings will be the responsibility of the Seller. Structural requirement/system configuration requirement All pressure parts will be suitable for the operation under specified steam condition and the condition that pressure and temperature reach the most severe state. Rotor and blade Feedwater pump turbine rotor will have residual internal stress thoroughly relieved. Rotor position relative to thrust shoe should be marked so that the position of rotor can be easily determined. Design of blade will be highly efficient and mature to enable blade not to be failed due to resonance under any operation conditions. The Seller will state rotor and blade material and provide rotor weight, center of gravity and rotor moment of inertia. Rotor of