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® WorleyParsons <br /> resources&energy <br /> Equipment will be designed for outdoor installation. <br /> 3.3 Heat Recovery Steam Generators (HRSG's) <br /> 3.3.1 HRSG Description <br /> The HRSG will be duct fired, three-pressure, reheat, natural circulation, drum type with <br /> horizontal gas flow, complete with manual main steam isolation valves, feedwater stop <br /> and check valves, relief valves, and a continuous and intermittent blowdown system. <br /> The high pressure (HP), intermediate pressure (IP), and low pressure LP sections will <br /> each consist of an economizer, evaporator, and superheater section. The reheat section <br /> will heat IP steam and exhaust steam from the HP section of the steam turbine for <br /> admission into the IP/LP turbine. The HRSGs will be designed and constructed to <br /> operate within the maximum exhaust gas flow and temperature ranges of the CTGs. The <br /> HRSGs will be designed for outdoor installation, with full enclosures over the drum <br /> areas. <br /> The HRSG will be fabricated, assembled, inspected and tested in accordance with <br /> Section 1 (Power Boilers) of the ASME Boiler and Pressure Vessel Code. The HRSG <br /> external piping will be furnished, installed and tested in accordance with the <br /> requirements of ASME B31.1 (Power Piping) and Section 1 of the ASME, Boiler and <br /> Pressure Vessel Code. <br /> The HRSG drums and internals will be sized for required steam separation at the <br /> predicted HRSG performance conditions for the minimum HRSG drum pressure. In <br /> addition, the steam drums will be designed to accommodate surges associated with <br /> startup, shutdown and rapid load changes. <br /> Blowdown from each HRSG will be piped to its respective blowdown tank. Quench <br /> water to cool blowdown before discharge will be supplied from the raw water system. <br /> Rate of quench water flow will be automatically adjusted in accordance with blowdown <br /> temperature. The boiler blowdown tank will be located in the boiler blowdown sump. <br /> All topside drains will be routed to grade. The bottom drains will terminate on the side <br /> of the HRSG and the valves will be accessible at grade. The drains will be headered <br /> together and the header drained into the boiler blowdown sump. Quench water will be <br /> provided to the sump from the raw water system. The nitrogen purge connections, one <br /> per drum, will terminate at the valve located within three feet of grade. In the event that <br /> long-term lay-up is required, plant operations will have to provide a nitrogen trailer with <br /> the required connectors, hoses and regulators. <br /> The HRSG reheater section will be designed for "wet" operation during startup and in <br /> case of a steam turbine trip. <br /> Each HRSG scope of supply will include an A36 structural carbon steel stack with <br /> Lodi Energy Center 3.3 -3 LEC AFC <br /> 071508 Rev.A <br />