This DN-14b checklist outlines the full procedure for gas mains jointing using fully automatic butt fusion equipment up to and including 355 mm PE pipe. It covers site preparation and safety, machine condition and power checks, cleaning and trimming, alignment verification, heater plate temperature control, and the automated fusion and cooling cycles. Quality assurance steps include dummy joints to clean the heater plate, bead inspection and measurement, bend-back testing, and documentation of each weld via printout or electronic record. Guidance is provided for when to repeat heater cleaning and for corrective action on faulty joints, with final assessor sign-off.
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