ASI SPECIFICATION 8565 - WEATHER RESISTANT SOUND ATTENUATED DROP-OVER ENCLOSURE TO BASE OR UL-142/2085 BASE/TANK WITH SOUND ATTENUATED FIXED INTAKE LOUVERS

Weather resistant thermal insulated drop over enclosure to base, concrete pad or UL-142/UL-2085 base tank, for natural gas or diesel generator set. Walk-In or Skin type available

1. An enclosure shall be provided to house each engine/generator and all accessories. The enclosure is to be in compliance with the National Electrical Code (NEC) and the National Fire Protection Association (NFPA) as applicable.

DESIGN OUTLINE:

a. Rigidity wind set equal to 110 MPH

b. Roof load equal to 50 lbs. per sq. ft.

c. Floor load equal to 200 lbs. per sq. ft.

d. Rain test equal to 4” per hour

e. Enclosure will consist of a roof, underframe, side walls, end walls and built with semi-monocoque construction.

f. The system shall include fixed sound absorbing air inlet louvers, an equipment enclosure section, and a cooling air discharge silencer hood section.

g. Roof and walls shall each be of one-piece, semi-monocoque construction. All framing members shall be steel. Skin material shall be min. thickness 0.040” pre-painted aluminum. Skin panels shall be interlocked to framing members on 24” centers maximum. Pop rivets and bolts are not acceptable fasteners to attach exterior skin to framing. Roof assembly shall be cambered to aid in rain runoff.

h. Insulation in walls and roof shall be semi-rigid, thermo-acoustic with thickness as required to meet the noise criteria specified and with a flame spread of 10, fuel contributed 0 and smoke developed 0. Lining shall be perforated18 gauge .040, mill-finish aluminum. Self-adhesive foam and loose or bat-type insulating materials will not be accepted.

i. The floor structure shall be rated for a minimum distributed load of 200 lbs./ft. and reinforced as required to support prevailing point-loading. The floor and underframe assembly shall consist of structural “C” Channel welded to form the outer perimeter. This perimeter shall be combined with formed or structural steel crossmembers so as to create a welded steel support structure for the installed power generation equipment. Steel channels shall be incorporated into the floor structurefor adequate structural support and attachment of the generator set and vibration isolators. The crossmembers shall be overlaid with diamond plate or floor plate steel for the purpose of load distribution, vibration isolation and sound attenuation.

j. Lifting provisions shall be provided at or near the enclosure base, with capacity and number suitable for rigging the entire assembly.

k. Single and/or double personnel access doors shall be provided. Doors shall consist of an extruded aluminum frame with skin material matching enclosure. Doors shall be fully gasketed to form a weather tight perimeter seal. Hinges shall be forged aluminum with stainless steel pins, handles shall be stainless steel and lockable, and lock mechanism shall be three-point, with panic hardware (if necessary for walk-in enclosures) to allow opening from inside even when locked. All door opening include an overhead rain gutter for channeling rainwater away from the enclosure.

l. The engine coolant & oil drains shall be extended to the exterior of the enclosure. The engine crankcase breather shall be extended to the exterior of the enclosure.

m. Air handling shall be as follows: Air will enter the enclosure through sound absorbing fixed louvers. Optional motor operated damper(s) shall be provided, wired to open at engine startup. Radiator discharge will be through a gravity operated damper and into a vertical discharge plenum through the top as dictated by airflow. The system shall not exceed 0.5” w.g. total external static pressure to endure adequate airflow for cooling and combustion.

n. Enclosure manufacturer shall internally or externally mount, pipe, and optionally insulate low profile exhaust silencer while maintaining the weatherproof integrity of the system. All exhaust piping and fittings shall be stainless steel. The exhaust outlet shall be terminated through the roof or discharge hood, with sufficient space provided to extend the exhaust outlet.

OPTIONAL ELECTRICITY FOR ENCLOSURE:

2. An electrical package shall be installed by the enclosure manufacturer prior to shipment as follows:

a. 1- 100 amp, 120/208, 3 phase Load Center with main breaker

b. 4 -100 w Incandescent lights with globes and guards

c. 2 - light switches

d. 1 - 5kw space heater with thermostat

e. 1 - 12 inch exhaust fan with thermostat and gravity damper

f. 2- duplex GFI receptacles.

g. Connection(s) for motor operated damper(s).

h. The sub-base tank alarms shall be completely wired.

i. All wiring shall be done in EMT or rigid conduit.D. Electrical connections for coolant heater, battery charger and day tank pumps (if specified) shall be provided as required.

j. A finished and completely assembly package shall be delivered to the site for final connections in the field by customer contractrs.

DOUBLE WALL SECONDARY CONTAINMENT SUB-BASE FUEL TANK

3. A sub-base fuel tank used in conjunction with the diesel generator set shall be as specified herein.

a. The sub-base fuel system shall be listed UL 142 or UL 2085, sub-section entitled Special Purpose Tanks EFVT category, and will bear their mark of UL Approval according to their particular classification and carry the Hall Patent for UL-2085 tanks.

b. The above-ground steel secondary containment rectangular tank for use as a sub-base for diesel generators is manufactured and intended to be installed in accordance with the Flammable and Combustion Engine and Gas Turbines-NFPA 37, AND Emergency and Standby Power Systems-NFPA 110.

c. Construction: (UL-142)

d. Primary Tank shall be rectangular in shape and constructed in clam shell fashion to ensure maximum structural integrity and allow the use of a full throat fillet weld.

e. Primary Tank shall have a Steel Channel Support System.

f. Reinforced steel box channel for generator support, with specified load rating for each generator set. Full height gussets at either end of channel and at generator set mounting holes shall be utilized.

g. The exterior coating must be type tested to withstand continuous salt spray testing at 100 percent exposure for 244 hours to a 5 percent salt solution 92-97% F. The coating has been subject to full exposure humidity testing to 100 percent humidity at 100° F for 24 hours. Tests are to be conducted in accordance with The American Standard Testing Methods Society.

h. Normal venting shall be sized in accordance with the American Petroleum Institute Standard No 2000, Venting Atmospheric and low Pressure Storage Tank not less than 1-1/4” ( 3 cm.) nominal inside diameter. An atmospheric mushroom cap shall be furnished and the installing contractor shall pipe above the highest fill point as a minimum.

i. The emergency vent opening shall be sized to accommodate the total capacity of both normal and emergency venting and shall be not less than that derived fro NFPA 30, table 2-8, and base on the wetted surface area of the tank. The wetted area of the tank shall be calculated basis of 100 percent of the primary tank. A zinc plated emergency pressure relief vent cap shall be furnished for the primary tank. The vent shall be spring-pressure operated with an opening is 0.5/psig and full opening pressure of 2.5 psig. Limits shall be stamp marked on top each vent. The emergency relief vent shall be sized to accommodate the total venting capacity of both normal and emergency vents.

j. There shall be a NPT opening within the primary tank with a raised fill pipe and lockable manual fill cap.

k. A direct reading, UL listed, fuel level gauge with dial shall be provided.

l. The fuel tank shall be installed beneath the floor mounted within a combined rupture basin/floor/underframe. The interstitial space between the tank and basin shall be monitored (through electronic means) to indicted a rupture condition (see below, Tank Monitoring System). All fuel tanks will include drainage plumbing, supply/return lines, and supply valve control. The fuel tank shall be outfitted with a fuel monitoring system. An independent float operated will be supplied for

m. Construction: (UL-2085)

n. The entire tank shall have UL 2086 protected type listing which meets the requirements of the 1994 Uniform Fire Code appendix 11-F and standard 79-7 for protected tanks, NFPA 30, 30A and 31,. The UL-2085 listing must also include the vehicle impact and ballistics protection and the inner tank must be built to UL-142 specification.

o. The internal steel tank shall be encased in 6” of light weight insulating concrete which is capable of preventing the internal tank temperature from rising not more than 145 degrees farenheit during a 2000 degree fire test for two hours as tested by Underwriters laboratories. The insulation may not carry any aggregates that act as heat sinks, shall be a monolithic (seamless) pour, contain no cold joints and be in one piece construction with no multiple sections.

p. Reinforced steel box channel for generator support, with specified load rating for each generator set. Full height gussets at either end of channel and at generator set mounting holes shall be utilized.

q. The exterior coating must be type tested to withstand continuous salt spray testing at 100 percent exposure for 244 hours to a 5 percent salt solution 92-97% F. The coating has been subject to full exposure humidity testing to 100 percent humidity at 100° F for 24 hours. Tests are to be conducted in accordance with The American Standard Testing Methods Society.

r. Normal venting shall be sized in accordance with the American Petroleum Institute Standard No 2000, Venting Atmospheric and low Pressure Storage Tank not less than 1-1/4” ( 3 cm.) nominal inside diameter. An atmospheric mushroom cap shall be furnished and the installing contractor shall pipe above the highest fill point as a minimum.

s. The emergency vent opening shall be sized to accommodate the total capacity of both normal and emergency venting and shall be not less than that derived from NFPA 30, table 2-8, and based on the wetted surface area of the tank. The wetted area of the tank shall be calculated basis of 100 percent of the primary tank. A zinc plated emergency pressure relief vent cap shall be furnished for the primary tank. The vent shall be spring-pressure operated with an opening is 0.5/psig and full opening pressure of 2.5 psig. Limits shall be stamp marked on top each vent. The emergency relief vent shall be sized to accommodate the total venting capacity of both normal and emergency vents.

t. There shall be a NPT opening within the primary tank with a raised fill pipe and lockable manual fill cap.

u. A direct reading, UL listed, fuel level gauge with dial shall be provided.

v. The fuel tank shall be installed beneath the floor mounted within a combined rupture basin/floor/underframe. The interstitial space between the tank and basin shall be monitored to indicted a rupture condition.

4. Enclosure and tank will be as manufactured by Acoustical Sheetmetal Incorporated (ASI), Virginia Beach, VA under their specification 8565. No substitutions will be accepted.