GB/T 29047-2021Prefabricated directly buried insulating pipes and fittings with rigid polyurethane foam and high density polyethylene casing (English PDF)

1 Scope

This document stipulates that the high-density polyethylene outer protective pipe (hereinafter referred to as the outer protective pipe) and the rigid polyurethane foam insulation layer (hereinafter referred to as the protective

Temperature layer), prefabricated direct-buried thermal insulation pipes composed of working steel pipes or steel pipe fittings (hereinafter referred to as thermal insulation pipes) and the product structure and requirements of thermal insulation pipe fittings,

Test methods, inspection rules and labels, transportation and storage.

This document is applicable to the prefabricated direct delivery medium whose temperature (long-term operating temperature) is not more than 120°C, and the occasional peak temperature is not more than 130°C.

Buried insulation pipe and its insulation pipe fittings.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

GB/T 3091 Welded steel pipe for low pressure fluid transportation

GB/T 8163 Seamless steel pipe for conveying fluid

GB/T 8923.1-2011 Visual assessment of surface cleanliness of steel surface treatment before coating-Part 1.Uncoated

The corrosion level and treatment level of the steel surface and the steel surface after the original coating has been completely removed

GB/T 9711 Steel Pipe for Pipeline Transportation System of Petroleum and Natural Gas Industry

Types and parameters of GB/T 12459 steel butt welding pipe fittings

GB/T 13401 Technical Specification for Steel Butt Welding Pipe Fittings

GB/T 18475-2001 Thermoplastic pressure pipes and pipe fittings material classification and naming overall use (design) coefficient

GB/T 29046 Testing method for technical indicators of prefabricated direct-buried thermal insulation pipelines for urban heating

GB 50236 Construction specification for welding engineering of field equipment and industrial pipelines

GB 50683 Code for Acceptance of Construction Quality of Field Equipment and Industrial Pipeline Welding Engineering

CJJ/T 254 Technical Specification for Leakage Monitoring System of Directly Buried Hot Water Pipes for Urban Heating

NB/T 47013.2-2015 Non-destructive testing of pressure equipment Part 2.Radiographic testing

NB/T 47013.3-2015 Non-destructive testing of pressure equipment Part 3.Ultrasonic testing

NB/T 47013.5-2015 Non-destructive testing of pressure equipment Part 5.Penetration testing

NB/T 47014 welding procedure qualification for pressure equipment

SY/T 5257 Steel induction heating elbow for oil and gas transportation

3 Terms and definitions

The following terms and definitions apply to this document.

GB/T 21087 | GB/T 29044 | CJ/T 395 | GB/T 29046 | GB/T 29045 | […]