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 VII Northport Capital Cost Estimate Descriptions
• HRSG foundations
• Main steam piping
• Hot reheat steam piping
• Cold reheat steam piping
• LP steam piping
• Boiler feed water system with two 100-percent flow boiler feed water pumps per HRSG
• Stack, one common concrete shell 250 feet high with two 22 foot diameter flues
• Boiler blowdown system
• Boiler chemical feed system
• Steam/water sampling system
• Aqueous ammonia storage, 20,000 gallons (approximately 5 days)
• Aqueous ammonia vaporization skid, one per HRSG
D3 Fuel Oil Facilities
The distillate oil supply includes demolition of the existing dock west of unit 1 and installation of a new
dock for barge unloading including unloading pumps and piping. An existing No. 6 oil tank will be
demolished and replaced with a new 5,000,000 gallon distillate oil storage tank, sized for approximately
five days operation. The new storage tank will be equipped with distillate oil forwarding pumps.
D4 Onsite Natural Gas System
The natural gas supply system is comprised of fuel gas piping and fuel gas conditioning equipment such
as a scrubber, moisture separator, coalescing filters, filter /separator, and metering equipment for each
combustion turbine. The MHI 501G gas turbine utilizes a bleed from the main gas turbine compressor to
cool the power turbine blades. The compressor bleed air is first cooled in a fin-fan type cooler (TCA
cooler). Waste heat from the TCA cooler is used to heat the incoming fuel gas. This TCA heat exchanger
is provided as part of the gas turbine package. New, underground gas piping from a connection point at
the existing gas yard to the new units is included.
G5 Instruments and Controls
Existing equipment to be reused will be controlled by the new DCS. Existing field instruments,
transmitters, control drives will be reused. An allowance has been included in the repowering project cost
estimate for miscellaneous refurbishment/replacement of existing control components. The existing
uninterruptible power supply and battery system will remain in service for any existing equipment that
may not be connected to the new system.
This account includes the following required for the new combined cycle equipment:
• Distributed control system, including HRSG controls, combustion turbine generator controls,
boiler feed pump controls, computer for data acquisition and logging and controls for existing
equipment to be reused.
• Uninterruptible power supply and battery system sized to supply power for emergency controls
and safe plant shutdown.
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