T/SDAS 839-2024 Polyvinyl chloride outer protective pipe, rigid polyurethane foam plastic prefabricated direct buried insulation pipe and fittings
T/SDAS 839-2024 Polyvinyl chloride outer protective pipe, rigid polyurethane foam plastic prefabricated direct buried insulation pipe and fittings
Basic Information
Scope
Main technical content: This document specifies the terms and definitions, product structure, requirements, test methods, inspection rules, and marking for prefabricated directly buried insulated pipes (hereinafter referred to as insulated pipes) and their insulated pipe fittings, which are composed of polyvinyl chloride outer protection pipes (hereinafter referred to as outer protection pipes), rigid polyurethane foam insulation layers (hereinafter referred to as insulation layers), and working steel pipes or steel pipe fittings. This document is applicable to prefabricated directly buried insulated pipes and their insulated pipe fittings, with a maximum operating temperature of no more than 120℃ and an occasional peak temperature of no more than 130℃ for the transported medium.