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1.Gas piping design, fabrication, inspection, and testing shall be in accordance with <br />ANSI B31.3. <br />2.Cast iron or semi-steel shall not be used. <br />3.Threaded gas pipe connections may be used on 2-inch nominal pipe size and smaller for <br />piping systems with a maximum operating pressure no greater than 150 psig. <br />Otherwise, such piping shall be socket- or butt-welded. Larger than 1-1/2-inch nominal <br />pipe size shall be butt-welded regardless of its operating pressure. <br />4.Tubing and tube fittings shall be stainless steel. Tube fittings shall be rated for at least <br />6000 psig working pressure. Tubing fittings 3/8 inch or smaller shall be Swagelok or <br />approved equal. Tubing fittings 2 inch or larger shall be Parker Face Seal stainless <br />steel or approved equal. Different or mixed brands of fittings shall not be used. Bidder <br />may use stainless steel pipe and socket welded stainless steel fittings in lieu of <br />stainless-steel tubing and compression type fittings except where disassembly is <br />required for maintenance. <br />5.Stainless steel tubing shall be seamless and bright annealed, ASTM SA 213, type 316. <br />The maximum hardness of the stainless-steel tubing shall be no more than Rockwell <br />hardness of 80. Where the following nominal OD tubing is used, the corresponding <br />minimum wall thickness shall be: <br />Nominal OD <br />Minimum Wall Thickness <br />1/4" <br />0.049" <br />3/8" <br />0.065" <br />1/2" <br />0.083" <br />3/4" <br />0.109" <br />1" <br />0.134" <br />CityofSantaAna-RFP20-095 <br />CNGFuelStation:Design, Build, Operate and Maintain <br />17 <br /> <br />