FEEDWATER SYSTEM Sample Clauses

FEEDWATER SYSTEM. Function The Feedwater System transfers heated feedwater from the heat recovery steam generator (HRSG) low pressure (LP) drums to the respective HRSG high pressure (HP) and intermediate pressure (IP) drums and also maintains the correct HP and IP drum water level over a wide range of steam demands. The Feedwater System also provides feedwater to various desuperheaters, and hot water to the fuel gas heater. The Feedwater System shall consist of the following major components: o One (per HRSG) 100 percent capacity horizontal multistage feedwater pumps with interstage takeoff. (These will be either split-case or segmented ring section design.) o Piping, valves, piping specialties and instrumentation System Description The feedwater pumps take suction from their respective HRSG low pressure drums. The feedwater pumps provide the necessary pumping head to supply feedwater to the HRSG IP and HP steam drums including piping friction losses and differential static head. An automatic recirculation control valve shall be provided for minimum flow recirculation of the feedwater pumps to prevent overheating and cavitation during startup and low load operation. Due to the configuration of the interstage takeoff, minimum flow through the high pressure discharge of the pump satisfies the minimum flow requirements of the interstage bleed and recirculation flow shall be required at the HP discharge only. The minimum flow recirculation valve shall be provided with anti-cavitation trim to accommodate the high pressure drop. Pump runout shall be prevented during initial fill of the HP feedwater system by a flow restricting orifice in parallel with a full flow manual isolation valve. When the HP feedwater -------------------------------------------------------------------------------- Proprietary Information Page 22 AES IRONWOOD CONTRACT FINAL ISSUE - OCTOBER 30, 1998 -------------------------------------------------------------------------------- system is filled, the full flow isolation valve shall be opened, and flow shall be unrestricted. The IP feedwater runout is limited by a back pressure control valve which maintains a minimum backpressure on the interstage bleed during HRSG filling and plant startup. This valve prevents the high pressure stages of the feedwater pump from being starved by the IP interstage takeoff during initial system fill. The feedwater pumps shall be supplied with instrumentation to monitor and alarm on high bearing temperature. Feedwater pump sucti...
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FEEDWATER SYSTEM. The feedwater system delivers feedwater from the LP steam drum to the IP and HP steam drums through their economizers. The system also supplies desuperheating water to the HP steam attemperator and the hot reheat steam attemperator. There are two (2) boiler feed pumps for each HRSG. One uninstalled spare pump will be provided for the project. The pumps are horizontal, multi-stage type with monitored automatic recirculation control to the LP drum.
FEEDWATER SYSTEM. Feedwater systems will be comprised of the following subsystems: · Condenser hotwell level control system · Boiler feed water pump minimum flow control

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