Boiler_Controls_Specifications.pdf

Part 1:

Specifications, General Application, Boiler & Controls

GENERAL SPECIFICATION:

The National Park Service, Denali National Park, Alaska is requesting bids for steam generation equipment able to fit into a government provided truck body.

The steam equipment will include all standard equipment and accessories as advertised in the manufacturer's specification sheet of model offered, unless otherwise specified herein.

APPLICATION:

The steam generating equipment will provide general steam thawing including culvert opening. Unit will be subject to varying terrain and weather conditions with temperatures ranging from minus 50 degrees Fahrenheit.

DOCUMENTATION REQUIRED FOR BID:

A basic manufacturer's product brochure describing the unit being bid is to be provided.

In addition, specifications marked with an asterisk (*) require supporting documentation in the form of a product brochure, manufacturer's technical data sheet, or a letter of clarification, which must indicate specifically what the bidder intends to supply in regard to said items, and/or how the specifications will be met. In order to help prevent technical errors, following each asterisk is space that may be used to address all of the asterisked items. It is required that a letter of clarification or the space behind the asterisked items be used to supply the required information.

ACCEPTABLE UNITS:

VAPOR CORP Model 4992.

1. STEAM GENERATOR:

1.1. General:

1.1.1. 3 PARTS (coils) (*) Continuous coil type steam generator with minimum 40 horse power capacity.

1.1.2. (*) To provide a rated evaporative capacity of minimum 1,000 pounds of water per hour with a 20 percent overload capacity.

1.1.3. (*) Heat Output: Minimum of 1,300,000 BTU (British Thermal Units) per hour.

1.1.4. To be capable of providing full steam pressure within five (5) minutes after starting, from cold.

1.1.5. Able to be securely mounted to a van body frame but with capability for ease of removal for maintenance.

1.2. Burner:

1.2.1. (*) Shall be pressure atomizing type, with a single nine (9) GPH (Gallons Per Hour) nozzle.

To be Monarch 100 degree hollow cone.

1.2.2. (*) The burner (adjustable fuel spray head assembly, part # 4503 5680) is to be capable of burning not greater than #2 diesel/fuel oil.

1.2.3. Incoming air to the burner to be delivered to the burner by a multi-vane blower wheel. An air duct, with protective screen, of galvanized or stainless steel shall draw outside air.

1.2.4. (*) Oil burner pump to provide a minimum pressure of 70 PSI (Pounds per Square Inch) with a maximum of 200 PSI pressure at the burner.

1.3. Ignition:

1.3.1. Unit to include two (2) separate 120 Volt AC electronic ignition modules (firing at the same time) to provide automatic control features for ignition. To be DONGAN brand or equivalent with 120 Volt AC primary voltage and 12,000 Volt AC secondary voltage.

1.3.2. Ignition transformers are to be mounted as to prevent excessive heat from the dome.

1.4. Motor:

1.4.1. (*) Unit is to be provided with a hydraulic motor of sufficient horse power to operate the blower, fuel pump, water pump and other accessories needed for proper function of the steam generator.

1.4.2. The hydraulic pump, valving, hoses and fittings going to the motor will not be required as part of this package.

1.4.3. If "V" belt system, to include a spring loaded tensioner.

1.5. Gauges:

1.5.1. (*) Any and all gauges that show pressures, temperatures, etc., are to be in U.S.A measurements such as PSI, Fahrenheit, etc.

1.5.2. All gauges listed below are to be fluid filled and a minimum of three (3) inches in diameter.

1.5.3. Steam Pressure Gauge - To indicate the steam pressure on the steam boiler.

1.5.4. Water Pressure Gauge - To indicate the pressure of the feed water.

1.5.5. Fuel Pressure Gauge - To indicate the pressure of the fuel to the sprayhead nozzle.

1.5.6. Two (2) each Peep Hole Glasses - To permit visual inspection of fire from the burner.

1.6. Valves and Controls:

1.6.1. (*) All steam rated valves will be ¼-turn ball valves, MARWYN 4700 Series p/n 4700-10A-

CS-FAHL rated at 480 degrees Fahrenheit at 275 to 300 PSI. This will include the ¼-turn valve located between the inlet check valve and the boiler.

1.6.2. Coil Blow down Valve - Used for blowing out the sediment in the steam generating coils.

To vent through the floor, between the frame rails.

1.6.3. (*) Normally closed fuel shutoff solenoids [quantity two (2)], will shut off the fuel pressure to the burner. They are energized open when certain start / run conditions are met.

1.6.4. A fuel pressure regulator is provided to allow adjustment of the fuel pressure to the nozzle.

1.6.5. Fuel Spray head:

1.6.5.1. To hold the fuel spray nozzle and is adjustable for proper position of spray cone.

1.6.5.2. To prevent dribbling of fuel from the nozzle when the steam boiler is shut down.

Accomplished by a spring-loaded fuel cut-off valve seating whenever the fuel pressure drops below 75 PSI.

1.6.5.3. To be accomplished by

1.6.5.4. Fuel Pump - To deliver fuel to the burner for combustion.

1.6.5.5. Fuel line running to the fuel pump is not to be run across floor where it could be damaged.

1.6.5.6. Safety Valve - Set and sealed at 250 PSI, to open and relieve the steam.

1.6.5.7. To vent through the floor, between the frame rails.

1.6.5.8. Dual Spark Plugs - To give a continuous electric spark for the ignition of the fuel.

1.6.6. (*) Steam Temperature Limit Control: To shut down the burner by bypassing the fuel should the temperature of the steam become excessive and auto reset when temperature of the steam falls back into parameter.

1.6.6.1. Shuts down the burner by interrupting the firing circuit should the temperature of the steam rise above the set point.

1.6.6.2. A thermocouple senses the coil outlet temperature and sends the signal to the temperature controller.

1.6.6.3. The steam temperature is displayed on the screen.

1.6.6.4. To be adjustable up to 550 degrees Fahrenheit.

1.6.7. To include steam pressure switch with manual reset.

1.6.8. Water Pump - To deliver sufficient water to the steam boiler for evaporation into steam.

1.6.9. (*) Water Relief Valve - To unload water at excessive pressure.

1.6.9.1. To be set at approximately 750 PSI

1.6.10. Water Return:

1.6.10.1. Valve – To be ASCO part # 8223G005 pre-set to 550 PSI.

1.6.11. Generator Supply Outlet:

1.6.12. Air Blower:

1.6.12.1. To include a tachometer and a data plate showing working range.

1.6.12.2. All bearings of sealed type, permanently lubed.

1.6.13. Valves:

1.6.13.1. (*) All valves will be ¼-turn ball valves with handles in an ‘in-line’ position when open, steam rated to 550 degree Fahrenheit and 600 PSI.

1.6.13.1.1. OPEN CLOSED

2. EXHAUST STACK:

2.1. To be minimum 12 inch diameter able to extend through van body roof.

2.2. An automatic rain cap controlled by fuel or hydraulic pressure shall be included.

2.2.1. To provide full open or full closed position.

2.2.2. The speed of the opening shall be at a controlled rate to prevent damage caused by too high of a speed.

2.2.3. Exhaust stack with cap should not protrude more than five (5) inches above the roof.

2.2.4. Construction materials of the exhaust stack system including stack, cap and roof connection shall be of stainless steel.

2.2.5. To be weather tight.

2.2.6. Operating Instructions:

2.2.6.1.1. A sample will be provided by the Denali National Park.

2.2.6.1.2. To be stick-on, durable, non-run ink. Black printing on a white background.

2.2.6.1.3. To be located on inside of access door.

2.2.6.1.4. To include one (1) additional set, shipped loose.

2.2.6.1.5. All switches, gauges, and controls to be properly identified by engraved type identification labels.

2.2.6.1.5.1. DYMO type tape labels are not acceptable.

2.2.6.1.5.2. Stick-on tape labels are not acceptable.