Specifications

REQUEST FOR PROPOSALS FOR
PURCHASE AND DELIVERY OF HEAVY-DUTY BUSES
RFP SRTA-2014-01
TECHNICAL SPECIFICATIONS
PAGE-6
December 2013
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and repairability, robust welded structures are required between the angled barrier and
the coach side skins. These shall be designed to dissipate collision energy.
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6. MATERIALS
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a. All materials used in construction of the coach and all its parts shall conform in all
respects to American Society of Testing Materials, Society of Automotive Engineers, or
similar association standards. Materials used shall be exactly duplicate in manufacture,
design and construction on each coach model.
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b. Reinforced fiberglass and plastic materials shall be excluded from the basic body
construction, except for replaceable panels, doors, and front and rear caps.
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c. All lumber shall be thoroughly kiln dried free from knots and checks and shall be of clear
straight grain, dressed on all sides.
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d. All painted aluminum sheets shall be thoroughly cleaned and coated on the outside with
PPG, or approved equal, DPU low VOC protective paint prior to assembly in coach.
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e. All joints shall be protected by application of zinc-chromated metallic compound, Butyl
Tape Sealer at assembly.
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f. Plywood shall be of a marine grade with sealed waterproof edges.
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g. All bolts, nuts, washers and exposed linkage shall be zinc, cadmium plated or phosphate
coated to prevent corrosion.
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h. All bolts, nuts, and washers shall be Domestic manufacture and be SAE Grade 5 or
better.
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7. CORROSION/UNDERCOATING
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a. The vehicle shall resist corrosion from atmospheric conditions and road salts. It shall
maintain structural integrity and nearly maintain original appearance throughout its
service life, provided it is maintained in accordance with the procedures specified in the
manufacturer's service manual by the SRTA. Materials exposed to the elements and all
joints and connections of dissimilar metals (and remote from each other in the galvanic
series), shall be corrosion-resistant and shall be protected from galvanic corrosion.
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b. The entire body frame assembly, access doors, fenders, cab, underbody,
wheelhousings, lower skirt panels, including closed-off body panel sections, and all welds
shall be treated and rust-proofed with a commercial grade heavy-duty rust-proofing
material. All metal body parts shall be given a thorough multiple-stage anti-corrosion
treatment. The product used shall be listed as a qualified product under Mil Spec C-
62218, Mil Spec C-0083933A (MR). Zinc chromate or zinc phosphate prime paint shall
be applied to both aluminum and steel. Body panels that are aluminum or tin coated, etc.,
or treated in any other method or procedure currently accepted by the commercial
vehicle industry, are acknowledged as meeting this requirement and need no further
treatment, except for finish prime/paint or undercoating where applicable. Representative
samples shall withstand a 2-week salt spray test in accordance with ASTM Procedure B-
117 with no visual or structural detrimental effects to normally visible surfaces, and no
significant structural degradation or weight loss of over 1 percent (1%) for other members
or components.