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Number of Rows High <br /> Nominal Pipe Size(in.) For SDRs* 18 and for SDRs*over 18,up for SDRs*over 26,up <br /> under to 26 to 32.5 <br /> 3 45 26 14 <br /> 4 45 26 14 <br /> 6 31 17 10 <br /> 8 24 13 8 <br /> 10 17 10 6 <br /> 12 13 8 5 <br /> 14 12 7 4 <br /> 16 11 6 4 <br /> 18 10 6 4 <br /> Pipe Diameter <br /> *SDR=Standard Dimension <br /> Ratio= Min.Wall Thickness <br /> • Verify that the pipe is not damaged by sharp rocks or excessive abrasion when the pipe is <br /> pulled into place during fusion welding and installation operations. <br /> 5.2.2 Fusion Welding <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 /> • Verify that certified fusion welding operators will be performing the welding. <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 /> • Verify that heater plate surface temperatures are maintained between 375°F and 400T <br /> for both coated plates and uncoated plates. Verify that operator checks heater plate <br /> surface temperatures with pyrometer. <br /> • Verify that inside and outside of pipe ends are cleaned to remove dirt,water, grease, and <br /> other foreign material. <br /> Page 47 <br />