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Cylinder enclosures: Any cylinders mounted outside of vehicle shall be enclosed. <br />Cylinder enclosures to be made of a minimum 14 gauge steel or <br />equivalent strength material. Any cylinders mounted inside of <br />vehicle shall be enclosed also to keep tanks, valves, plumbing, etc. <br />protected fi-om damage. The material may be wood, aluminum, or <br />plastic finished to match vehicle interior. <br />Cylinder cradles: Cylinder cradles to be made of A36 low carbon steel with a tensile <br />strength of 58,000 PSI. Tank brackets and hangers to meet or <br />exceed NFPA52 standards. <br />Plumbing: A minimum of 3/8" seamless stainless steel tubing with a.049 wall <br />thickness with a 4800 P.S.I. working rating and a 20,000 P.S.I. <br />burst pressure is to be used. All high pressure tubing is constructed <br />of stainless steel. All lines are supported with either split block <br />high pressure retaining devices or rubber insulated steel clamps. <br />Wherever movement may be present high pressure hoses that <br />comply with ANSFIAS, NGV4.2-1999, CSA 12.52 shall be used. <br />Safety check valves to be installed downstream from the fill <br />receptacle and before the cylinders. Manual 1/4turn shut-off valve <br />and mechanical high pressure gauge must be used. Unit shall also <br />have an electrically operated valve at tank, <br />Wiring: All wiring, internal and external, shall be loomed, and properly <br />secured and routed in a professional manner. Any necessary wire <br />splices and or connections shall be soldered and shrink-wrapped, <br />or finished using crimped connectors and shrink-wrapped. Loom to <br />be securely fastened and supported to the inside of compartment <br />walls using properly sized cushion clamps, metal clips, or other <br />industry accepted supporting hardware. Tie -wraps shall only be <br />used in between primary wiring supports as necessary to aid in <br />securing wire bundles. Tie -wraps SHALL NOT be used for the <br />primary supporting or securing of wiring. <br />General Provisions: Alt cylinder mounting fasteners are constructed with Grade 8 <br />material and installed in a manner that is compliant with NFPA-52 <br />regulations and are tightened to S.A.E. specifications. All attaching <br />hardware to be corrosion resistant and incorporate self-locking <br />nuts, or either a lock washer or star washer at the minimum. Where <br />the attaching hardware passes thru the body, bed or cargo area of <br />the vehicle, a substantial plate or large fender washer shall be used <br />to properly distribute the load. Plain washers to be incorporated <br />under the head of hex -head bolts. <br />Storage Tank: Tanks to be type IV 16 GGE nominal. Vendor shall provide <br />pricing for tank size options. All tanks to be certified for 20 years <br />and manufactured in the same year as bid. Vendor to consult with <br />Fleet Manager for exact size and placement. <br />12 <br />