TE 16.1 CHP System Description (1).pdf

TE 16.1 CENTRAL HEATING SYSTEM

General System Description: The Central Heating System consists of the Central Heating

Plant (CHP), Condensate Lift Station, Steam Distribution and Condensate return piping, and various pits and manholes, containing valves, surge tanks, expansion tanks and other associated equipment.

A system description follows:

(1) The Central Heating Plant (CHP): The CHP located at Base Kodiak is in

Building N-24. The plant, which supplies the Base with 50 psig steam from four

(4) Cleaver-Brooks 800 hp steam boilers, began operation in November 1984.

The boilers, designed for a 150 psi pressure with a 135 psi maximum operating pressure, steam output of 26,836 lbs. per hour, and fuel oil consumption of 240 gallons per hour, are oil fired with propane gas ignition. Each boiler is controlled by a programmed relay in its control panel, and are fueled by diesel, JP-5, and blends of these fuels with off-spec fuel and/or used oil.

(2) The CHP is served from several outside services as follows:

a. Electric Power: Kodiak Electric Association through a 13.8 kV to 480 V step down transformer located outside on the north side of the building.

b. Potable Water: USCG Base Kodiak water system.

c. JP-5 and MGO diesel oil: USCG Base Kodiak Tank Farm (Tanks N10, N12 and N60).

d. Used Oil: USCG Base Liquid Oily Waste Facility (LOWS).

e. Sewer System: Ties into the Base sanitary sewer system.

f. Condensate Return: Condensate lift station (N99) near the power plant.

The lift station is considered a part of the steam boiler plant equipment.

g. Remote Alarms and status indicators.

(3) A breakdown of the CHP follows:

a. Electrical System: The electrical system in the CHP consists of a 480 volt switchgear panel with a main incoming circuit breaker and a distribution breaker panel serving the 277 volt lighting system, fuel oil pumps, boilers, feed-water pumps, condensate lift station, and a 30 KVA dry-type transformer, which in turn, serves a 208Y/120 volt distribution breaker panel. The low voltage panel serves the fire alarm system, control power to the boilers, outdoor high pressure sodium lighting, water softener, hot water tank, chemical solution (water treatment) tanks, receptacles, power roof ventilator, roll up (vehicular) door, and wall louvers.

b. Standby Electrical Generator: A 500KW diesel generator with automatic switchgear is installed adjacent to the CHP building. The generator is dedicated to provide emergency electrical power to the CHP in times of disruptions to normal electrical power.

c. Fire Alarm System: This system consists of a fire alarm panel, thermal detectors, pull stations, and two alarm bells.

d. Plant Computers, Monitors, and Annunciators: The Plant has a computer and computerized control systems, recorders, monitors, and annunciators, which are primarily located in the steam boiler plant office. These systems and components monitor the plant systems, control components, and record and indicate steam output, fuel oil consumption, day tank fuel levels, feed-water consumption, and other system parameters. A computer monitor and control panel for monitoring the water plant and system is also located in the office along with a King Fisher alarm panel to monitor utility, fire, intrusion, and other signals.

e. Feed-water System: The boiler feed-water system receives water from the condensate return lift station, supplemented by makeup water from the potable water system. It consists of a Cleaver-Brooks de-aerator, three 130 GPM Grundfos pumps driven by 480 volt, 15 hp Westinghouse motors (one or two of which operate at any one time), and a pump control panel.

f. Chemical Treatment System: The chemical treatment system provides chemical solutions to the de-aerated boiler feed-water. The system consists of two 55-gallon polyethylene tanks with stainless steel motor-driven agitators, chemical feed pumps, 120 volt motors, pump control panels, boiler water/manifold sampling cocks and a boiler water sampling and testing area with counter and sink. The chemical solution tanks, under normal operation, require daily replenishment.

g. Blow-down and Contaminated Drain System: The blow-down system incorporates continuous regulated blow-down in each boiler and a manual blow-down for each boiler. Its purpose is to remove some of the impurities from the boiler water. The system consists of a vertical cylindrical steel blow-off tank rated at 150 psig and 500 deg. F, with a capacity of handling a continuous blow-off rate of 4,000 lbs per hour.

Blow-off water is routed through floor drains to an oil interceptor to remove oil from the waste before it enters the storm drainage system.

h. Potable Water System: The potable water system supplies water to the plumbing fixtures and makeup water to the de-aerator. The plumbing fixtures include three fire hoses contained on rack and valve mounts on the walls of the building. They also include the 30-gallon electric hot water heater, boiler water sampler coolers, boiler water testing bench sink, water softeners, shower, toilet facilities, and mop sink.

i. Fuel Oil System: The fuel oil system supplies JP-5 or Diesel to all boilers and off-spec fuel or used oil to all boilers. The fuel is received, stored and supplied in two, 20,000 gallon day tanks that receive fuel from the tank farm. These 20,000 gallon

JP-5/DF-2/waste fuel day tanks supply fuel to all boilers. Two 30 GPM Gould fuel oil pumps driven by Westinghouse 460 volt, 5 hp motors pump the oil to the boilers:

one pump operating at any one time and the other on standby.

j. Ignition Gas System: A propane tank is located outside the building on the south side. The propane is used for burner ignition in the boilers. Once the fuel oil has been ignited, the propane gas is shut off. Igniter gas flow is controlled by the boiler controls. The Contractor maintains this system, and maintains an adequate propane supply.

k. Condensate Return System: The condensate return system collects and stores condensate in the condensate return lift station reservoir. The condensate is then pumped to the deaerator tank to be re-circulated to the boilers. The lift station contains pumps with motors.

l. The main boiler for building 614 and its associated components are maintained as part of the CHP responsibilities.

m. The maintenance and operation of the 3 transportable boiler plants are part of the

CHP responsibilities.

** Steam Distribution and Condensate Return System exterior lines & components: Are not considered part of the CHP or its operation. They are maintained under another section of the PWS. Steam and condensate are distributed from and returned to the CHP through a system of pipes and valves. These pipes and valves, of various size, and contained in utilidors, pits, and manholes throughout the base, and are widely variable in physical condition.