Specifications

December 2013
REQUEST FOR PROPOSALS FOR
PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES
RFP SRTA-2014-01
TECHNICAL SPECIFICATIONS
PAGE-12
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10.1 Air Compressor
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a. Air compressor shall be a Wabco, or approved equal, sized by the bus
manufacturer for the air system requirements and duty cycle of the bus.
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b. Compressor shall be gear driven by the engine. The compressor shall be
equipped with an inlet check valve to minimize the blow by of oil through the
compressor.
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c. Air Governor shall be Bendix-Westinghouse "D-2" type, or approved equal.
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d. Discharge line from the compressor to the air dryer and first tank shall be not
less than seven-eighths inches (7/8”) inside diameter of stainless steel braided
construction with teflon inner liner. The discharge line will be properly supported
to prevent chafing or damage and routed to insure the line will drain to the first
tank/dryer.
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10.2 Air Tanks
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a. Air reservoirs shall be of adequate capacity for supplying the air volume needs of
the coach. All air tanks shall be equipped with four (4) drain valves mounted on
the road side, and have pull cords at lower skirt curbside.
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b. There shall be low-air pressure switches located on the air tanks. They shall
monitor the primary and secondary reservoir air pressure.
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c. In combination with the visual and audible signals, there shall be a single
“VDO”, or approved equal, dual needle air pressure gauges reading the
pressures of the primary (rear brake) and secondary (front brake) reservoirs.
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d. All air lines shall be synflex nylon tubing, color coded, meeting the requirements
of SAE type J844, except for the supply lines, which shall be 2807 stainless steel
braid.
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10.3 Air Dyer
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The air system shall be equipped with a SKF, HCT-2000 Duraguard air dryer, or
approved equal, mounted in a location approved by the manufacturer and reviewed with
the SRTA during the pre- production meeting.
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10.4 Brake Lines Body Mounted
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a. All air lines shall be synflex nylon tubing, color coded meeting the requirements
of SAE type J844. The supply lines shall be 2807 stainless steel braid, Teflon
inner core for heat resistant. Lines shall be securely mounted to frame to prevent
chafing or wear. Clamps shall be of proper size. Lines shall be protected at
clamps with heat resistant material.
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b. Rubber grommets shall be used at all points where air lines pass through
bulkheads or any supports.