PIPELINE WELDING PROCEDURE SPECIFICATION
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6.1. Butt Welds: A minimum preheat temperature of 120 C 250 F shall be applied to an area at. least 51 mm 2.0 in. on each side of the weld joint for its entire circumference prior to welding.
aeis welding procedure specification
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A prequalified welding procedure specification is only allowed by certain welding codes. And a prequalified WPS is not a published document you can buy, it still must be developed. If you buy a copy of AWS D1.1 Structural Welding Code Steel expecting to find prequalified welding procedures you are in for a big surprise.