This document specifies the product structure, requirements, test methods, inspection rules, as well as marking, transport and storage of prefabricated directly buried insulating pipes (hereinafter referred to as insulating pipes) and fittings, comprising outing casing pipes of high density polyethylene(hereinafter referred to as casing pipes), rigid polyurethane foam plastic insulation layers (hereinafter referred to as insulation layers), steel service pipes or steel fittings.
This document is applicable to prefabricated directly buried insulating pipes and fittings, for continuous operation at various temperatures up to 120 ℃ and occasionally with a peak temperature up to 130 ℃.
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