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<br /> Page 38 <br /> <br /> <br /> Number of Rows High <br /> Nominal Pipe Size (in.) For SDRs* 18 and <br />under <br /> for SDRs* over 18, up <br />to 26 <br /> for SDRs* over 26, up <br />to 32.5 <br />3 45 26 14 4 45 26 14 6 31 17 10 8 24 13 8 10 17 10 6 12 13 8 5 14 12 7 4 16 11 6 4 18 10 6 4 <br />*SDR=Standard Dimension <br />Ratio= <br /> <br />Pipe Diameter <br /> <br /> <br /> <br /> <br /> Min. Wall Thickness <br /> <br /> Verify that the pipe and tanks are not damaged by sharp rocks or excessive abrasion <br />when the pulled into place during fusion welding and installation operations. <br /> <br />5.2.2 Fusion Welding <br /> <br /> Before pipe fusion welding operations and installations verify that solid walled pipe, <br />perforated pipe, fittings, and flanged couplings comply with product requirements of the <br />technical specifications. <br /> <br /> Verify that certified fusion welding operators will be performing the welding. <br /> <br /> Verify that caution is taken to prevent water from coming in contact with the pipe and <br />heater plates during welding operations. A shelter may be required for the fusion <br />welding machine to allow operations to continue in adverse weather conditions. <br /> <br /> Verify that heater plate surface temperatures are maintained between 375°F and 400°F <br />for both coated plates and uncoated plates. Verify that operator checks heater plate <br />surface temperatures with pyrometer. <br /> <br /> Verify that inside and outside of pipe ends are cleaned to remove dirt, water, grease, and <br />other foreign material.