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

Re-powering Study for the Northport and Port Jefferson Power Stations
Appendix II Northport System Descriptions
One instrument air receiver is provided downstream of the dryers to provide surge capacity for the
Instrument Air System.
From the air filtration and drying units, instrument air is provided to the various instrument air users
throughout the plant.
2.13 Plant Makeup Water Treatment
For Northport, raw water (city water) is used for service water, fire protection, and demineralized water
system makeup. Raw water is ultimately used in the steam cycle make up after being treated
appropriately.
Untreated water is stored in the raw water tank. The lower portion of the tank is dedicated for the fire
protection system and water for the other systems in the upper portion. Raw water is drawn from a nozzle
above the fire water storage high level. The upper portion of the tank has sufficient storage to meet raw
water demand for a safe shutdown of the plant in the event of a loss of off-site water supply.
Two 100% capacity service/raw water pumps are provided. The service water system provides a feed to
the water treatment cycle, and to miscellaneous plant washdown services.
Refer to PID-09-21A in Appendix III.
Two 100% demineralizer feed pumps direct water from the service water tank to a reverse osmosis/EDI
demineralizer system. Pumps are started and stopped by the operator from the control room using the
distributed control system (DCS). Demineralized water is directed via demineralizer outlet pumps to the
demineralized water storage tank. Two 100% demineralized water forwarding pumps draw suction from
the tank to distribute water to the condenser for steam cycle make-up, combustion turbine generator wash
water skid, combustion turbine evaporative coolers, combustion turbine water injection (when burning
oil) and to the phosphate chemical feed skid.
2.14 Plant Waste Water Treatment
Refer to PID-13-19A in Appendix III.
All liquid wastes produced within Northport is collected in their designated sumps and pumped to the
existing wastewater treatment system. Each sump will have two 100 percent capacity sump pumps
controlled by float-switch actuated mechanical alternator to equalize the wear on pumps. Each sump
pump will be installed according to the manufacturer’s recommendations for the clearance between the
pump casing and the floor of the sump. Each sump float-switch actuated mechanical alternator will
provide protection for its pumps by stopping the operating pump at a predetermined low level in the
sump. The pump alternator will also have a high level switch to start the selected pumps and a high-high
level switch to start the standby pump and alarm. Each sump has its own set of controls and manual
valves.
Steam turbine area wastewater is collected in the condensate sump. One of two 100 percent condensate
sump pumps route condensate sump water to the oil/water separator.
Oily runoff and drainage from the power block and surrounding areas is collected in the oil/water
separator. Water separated from the oil is routed to the wastewater collection sump by one of two 100
percent oil/water separator sump pumps.
March 30, 2009 166