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GB/T 39246-2020Prefabricated directly buried insulating fittings with seamless high density polyethylene casing pipe (English PDF)

高密度聚乙烯无缝外护管预制直埋保温管件

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

November 19, 2020

Implementation date

October 1, 2021

Scope

GB/T 39246-2020 is the English-translated version of 高密度聚乙烯无缝外护管预制直埋保温管件.

GB/T 39246-2020 is the Chinese standard "Prefabricated directly buried insulating fittings with seamless high density polyethylene casing pipe".

Its scope clause reads: This standard specifies the terms and definitions, product construction, requirements, test methods, inspection rules, as well as marking, transportation and storage of prefabricated directly buried insulating fittings with seamless high density polyethylene casing pipe.

This standard is applicable to the manufacturing and inspection of the prefabricated directly buried insulating fittings with seamless high density polyethylene casing pipe whose conveying medium temperature (long-term operating temperature) is not greater than 120°C and peak temperature is not greater than 130°C. Its clauses include terms and definitions; product structure.

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Document preview — GB/T 39246-2020

National Standard of the People's Republic of China

ICS: 91.140.10
Classification: P 46

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Product structure
5 Requirements
5.1 Steel fitting
5.2 Casing fittings
5.3 Insulating layer
5.4 Insulating fittings
6 Test methods
7 Inspection rules
7.1 Inspection classification
7.2 End-of-manufacturing inspection
7.3 Type inspection
8 Marking, transportation and storage
8.1 Marking
8.2 Transportation
8.3 Storage
Annex A (Normative) Dimensions of T-shaped insulating tee

1 Scope

This standard specifies the terms and definitions, product construction, requirements, test methods, inspection rules, as well as marking, transportation and storage of prefabricated directly buried insulating fittings with seamless high density polyethylene casing pipe.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 8923.1-2011 Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous

GB/T 12459 Steel buttwelding pipe fittings - Types and parameter

GB/T 13401 Steel buttwelding pipe fittings - Technical specification

GB/T 18475-2001 Thermoplastics materials for pipes and fittings for pressure applications - Classification and designation - Overall service (design) coefficient

GB/T 29046 Test methods of technical specification for pre-insulated directly buried district heating pipes

GB/T 29047 Prefabricated directly buried insulating pipes and fittings with polyurethane foamed-plastics and high density polyethylene casing pipes

GB 50236-2011 Code for construction of field equipment, industrial pipe welding engineering

CJJ/T 254 Technical specification for leakage surveillance system of directly buried heating pipe

NB/T 47013.2-2015 Nondestructive testing of pressure equipments - Part 2: Radiographic testing

NB/T 47013.3-2015 Nondestructive testing of pressure equipment - Part 3: Ultrasonic testing

NB/T 47014 Welding procedure qualification for pressure equipment

SY/T 5257 Steel bends for oil and gas transmission

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1

seamless high density polyethylene casing pipe generic term for seamless casing elbow, seamless casing bend, seamless casing T-shaped tee, seamless casing reducer, etc., which are formed by extrusion or pulling from high density polyethylene raw materials

3.2 reinforced weld

butt weld of polyethylene casing branch pipe of T-shaped tee using an electric fusion welding tape sleeve

3.3 determination of environmental stress cracking

capability of polyethylene specimens to withstand sustained static tensile loads when they are immersed in a surfactant solution at a specific temperature

4 Product structure

4.1

The prefabricated directly buried insulating fittings with seamless high density polyethylene casing pipe shall be of a bonded insulation structure in which steel fitting, insulating layer and seamless casing fitting are closely bonded, and guiding holder and signal line may be set in the insulating layer.

4.2

The schematic diagram of product structure is shown in Figure 1.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

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