Appendix E-2.c.i Energy Plan 2004-2013 Follow-up Studies and ...

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Re-powering Study for the Northport and Port Jefferson Power Stations Appendix II Northport System Descriptions storage tank. The recirculation line is designed for single pump operation. Therefore, the duration of twopump operation should be limited when in the minimum recirculation mode. The condensate storage tank level is controlled by make-up and draw-off. Condensate storage tank makeup is provided by normal make-up and the high-capacity start-up make-up control valves which control demineralized water flow into individual condensate storage tank connections in response to condensate storage tank low level. Both make-up control valves direct demineralized water directly into the condensate storage tank to ensure the condensate pump suction source. In response to high tank level, the draw-off control valve directs condensate pump discharge to the plant equipment drains. A sampling connection is provided on the condensate pump discharge to monitor water chemistry. Chemicals controlling pH and oxygen are injected into the condensate discharge piping upstream of the air ejectors and gland steam condenser to maintain water chemistry. The control system is designed to automatically start the standby pump when the condensate header pressure becomes low. The condensate pump(s) will automatically trip if the condenser hot well level drops below a minimum acceptable level. 2.8 Feedwater Refer toPID-06-1A and PID-06-01B in Appendix III. The feedwater system has two feedwater pumps for each HRSG. The two 100% capacity, segmental ring feedwater pumps are each fitted with an adjustable speed fluid coupling and driven by a constant speed motor. The pumps take suction from the LP drum of the related HRSG. The pump discharge feeds the relevant HRSG’s HP system. Each pump has an interstage bleed that feeds the relevant IP system. The pump suction lines each contain a manual gate valve, pressure and temperature instrumentation, and a duplex basket strainer with a differential pressure transmitter to provide indication and a high alarm on the distributed control system (DCS). 2.8.1 High Pressure Feedwater Each feedwater pump HP discharge line is provided with an automatic recirculation (ARC) valve and a manual gate valve. The ARC valve automatically maintains the required minimum flow through the pump by recirculating water back to the HRSG LP drum. The recirculation line has a (spring-loaded) backpressure regulator valve and a gate valve. The feedwater pump HP discharge line connects to the HRSG HP economizer inlet. The line has a branch for LP drum filling, a sample connection, a branch to the HRSG HP superheater attemperator, and a branch to the main steam bypass valve. The HP superheater attemperator spray branch has a manual block valve, a flow element and transmitter for DCS flow indication. The main steam bypass desuperheater branch has a manual block valve. Downstream of the branch connections, the HP feedwater line connects to the HP economizer. The line contains a drum level control valve, with manual isolation valves and a manual bypass valve. Upstream of the control valve are a flow element with flow transmitter, a pressure transmitter, and a temperature indicator. The flow signal, along with drum level and steam flow signals, is used to position the drum level control valve. A pressure transmitter is provided downstream of the drum level control valve. March 30, 2009 162
Re-powering Study for the Northport and Port Jefferson Power Stations Appendix II Northport System Descriptions A constant differential pressure is maintained across the HP drum level control valves by varying the speed of the feedwater pump. A motor operated on-off tight shutoff valve is provided downstream of the HP drum level control valve to prevent water leakage into the drum during startup. 2.8.2 Intermediate Pressure Feedwater Each feedwater pump has an interstage bleed connection for IP feedwater supply to the HRSG IP economizer inlet. The connection is piped to a line containing a pressure gage, a check valve, and a gate valve. A branch line from the condensate system connects to the line to provide water to fill the IP drum. A branch from the line provides water for the HRSG reheater attemperator. This line has a gate valve and a flow element and transmitter for DCS indication. Downstream of the branch connections there is a pressure transmitter. The IP feedwater line connects to the HRSG IP feedwater inlet connection. Downstream of the inlet connection, within the HRSG's vendors scope, there is a check valve, a manual gate valve, the IP economizer, a flow element with a flow transmitter, a temperature element, a drum level control valve with manual block and bypass valves, and an air operated on-off tight shutoff valve. The flow signal, along with the drum level and steam flow signals, is used to position the drum level control valve. A branch line immediately downstream of the economizer and upstream of the drum level control valve provides the heating medium for the fuel gas heater. 2.9 Fuel Gas Refer to PID-8-7A through 7D in Appendix III. The fuel gas delivered to Northport is AGA pipeline quality gas. No gas compressors are required. The fuel gas system (FGS) is designed to meet the requirements of the CTs including flow, pressure, temperature, moisture content, and cleanliness. To provide these requirements the FGS will include a pressure-reducing station, metering, filtration, gas heating, flow control, and scrubber with vent stack and CH4 monitors to detect gas leakage. The FGS piping begins at the outlet of the gas suppliers metering station. A single line is routed from the metering station, through a knockout drum and filter/separator to meet the CT cleanliness requirements. Liquids separated from the gas stream are automatically drained into a fuel gas drains tank. A containment area is provided under the drain for capturing spills. A knockout drum, designed to remove any liquids from the pipeline gas, will be installed at the interface with the gas supplier upstream of the filter/separator. For The Backyard Option at Northport, a 100% capacity shell and tube fuel gas heat exchanger is provided for each gas turbine to raise the fuel temperature to the gas turbine manufacturer’s requirements. The source of heat for these is cycle steam. The fuel gas supply lines leaving the heaters are routed to their respective CT enclosures. The CT enclosures include the gas shutoff, vent, and control valves that control the flow of gas to the CTs. 2.10 Aqueous Ammonia Refer to PID-08-17A in Appendix III. March 30, 2009 163
Page 1 and 2: Electric Resource Plan 2010 - 2020
Page 3 and 4: March 30, 2009 Re-powering Study fo
Page 5 and 6: Northport Repower Study Option 4 2x
Page 7 and 8: Re-powering Study for the Northport
Page 21 and 22: • Auxiliary Boiler System • All
Page 23: Re-powering Study for the Northport
Page 31 and 32: 1 2 3 4 5 6 7 8 9 10 A SUPERHEATER
Page 33 and 34: 1 2 3 4 5 6 7 8 9 10 A 0304 PID-03-
Page 35 and 36: 1 2 3 4 5 6 7 8 9 10 A 0341 PID-03-
Page 37: 1 2 3 4 5 6 7 8 9 10 A 0368 PID-03-
Page 40 and 41: 1 2 3 4 5 6 7 8 9 10 A 0831 PID-08-
Page 42 and 43: 1 2 3 4 5 6 7 8 9 10 A 0427 PID-04-
Page 44 and 45: 1 2 3 4 5 6 7 8 9 10 A FGS FGS FGS
Page 46 and 47: 1 2 3 4 5 6 7 8 9 10 A 0823 PID-08-
Page 50 and 51: 1 2 3 4 5 6 7 8 9 10 0904 PID-09-09
Page 52 and 53: 1 2 3 4 5 6 7 8 9 10 A FROM AIR COM
Page 54 and 55: 1 2 3 4 5 6 7 8 9 10 A REVISION DES
Page 56 and 57: 1 2 3 4 5 6 7 8 9 10 A 1330 PID-13-
Page 58 and 59: 1 2 3 4 5 6 7 8 9 10 A FROM HRSG 1A
Page 60 and 61: 1 2 3 4 5 6 7 8 9 10 A 0304 PID-03-
Page 62 and 63: 1 2 3 4 5 6 7 8 9 10 A 0341 PID-03-
Page 64 and 65: 1 2 3 4 5 6 7 8 9 10 A 0368 PID-03-
Page 66 and 67: 1 2 3 4 5 6 7 8 9 10 A REVISION DES
Page 68 and 69: 1 2 3 4 5 6 7 8 9 10 A 0831 PID-08-
Page 70 and 71: 1 2 3 4 5 6 7 8 9 10 A 0427 PID-04-
Page 72 and 73: 1 2 3 4 5 6 7 8 9 10 A FGS FGS FGS
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1 2 3 4 5 6 7 8 9 10 A 0823 PID-08-
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1 2 3 4 5 6 7 8 9 10 CCW VSH 0132A
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1 2 3 4 5 6 7 8 9 10 0904 PID-09-09
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1 2 3 4 5 6 7 8 9 10 A FROM AIR COM
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1 2 3 4 5 6 7 8 9 10 A REVISION DES
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1 2 3 4 5 6 7 8 9 10 A 1330 PID-13-
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Re-powering Study for the Northport
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Fuel Systems Re-powering Study for
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Accessory Electric Plant Re-powerin
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Fuel and Feed Re-powering Study for
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Accessory Electric Plant Re-powerin
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• Grounding and lightning protect
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• Combustion turbine foundation
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D3 Fuel Oil facilities Re-powering
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Appendix E-2.c.i Energy Plan 2004-2013 Follow-up Studies and ...

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