GB/T 26255-2022
Steel-plastic-transition fittings for polyethylene(PE) piping systems for the supply of gaseous fuels (English Version)

Standard No.

GB/T 26255-2022

Language

Chinese, Available in English version

Release Date

2022

Published By

國家市場監(jiān)督管理總局、中國國家標(biāo)準(zhǔn)化管理委員會(huì)

Latest

GB/T 26255-2022

Replace

GB/T 26255.1-2010 GB/T 26255.2-2010

Scope

This document specifies the materials, product classification, requirements, test methods, inspection rules, marks, and packaging of steel-plastic conversion pipe fittings (hereinafter referred to as steel-plastic conversion) for the transitional connection between PE pipes and metal pipes in polyethylene (PE) piping systems for gas. , transportation and storage. This document is applicable to the PE piping system and its components for gas transmission and distribution with an operating temperature of -20 ℃ ~ 40 ℃. The steel pipe part end of steel-plastic conversion can be connected to other metal pipes by thread, welding or flange, and the PE part end can be connected to other metal pipes. It is connected to PE pipes by means of hot-melt butt joint and electro-fusion connection. Note: This document specifies the steel-plastic conversion parts and their overall performance and requirements. During the steel-plastic conversion, the steel-plastic joint will not be pulled out before the pipe section at the end of the PE part yields (destroys). It is the responsibility of the purchaser to properly select the products specified in this document according to their specific application requirements and in combination with the requirements of relevant laws, standards or specifications. According to product use or field, conveying medium, maximum operating pressure (MOP), component materials, rigid components used, load resistance capacity of connection end, corrosion resistance, working temperature range of installation and use, etc. declaration in the file.

GB/T 26255-2022 Referenced Document

• GB 50236 Code for construction of field equipment, industrial pipe welding engineering
• GB/T 15558.1 Buried polyethylene (PE) piping systems for gas use Part 1: General principles*， 2023-11-27 Update
• GB/T 15558.2 Buried polyethylene (PE) piping systems for gas use Part 2: Pipes*， 2023-11-27 Update
• GB/T 18252 Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation
• GB/T 18570.3 Preparation of steel substrates before application of paints and related products.Tests for the assessment of surface cleanliness.Part 3:Assessment of dust on steel surface prepared for painting (pressure-sensitive tape method)
• GB/T 18570.9 Preparation of steel substrates before application of paints and related products.Tests for the assessment of surface cleanliness.Part 9:Field method for the conductometric determination of water-soluble salts
• GB/T 19278-2018 General terms and their definitions of thermoplastic pipes, fittings and valves
• GB/T 23257 Polyethylene coating for buried steel pipeline
• GB/T 23258 Standard practice controlling internal corrosion in steel pipelines and piping systems
• GB/T 23658 Elastomeric seals.Material requirement for seals used in pipes and fittings carring gaseous fuels and hydricarbon fluid
• GB/T 2828.1 Inspection procedure by count sampling part 1: Lot by lot inspection sampling plan retrieved by acceptance quality limit (AQL)
• GB/T 2918 Standard environment for conditioning and testing of plastic specimens
• GB/T 8163 Seamless steel pipes for liquid service
• GB/T 8806 Plastics piping systems.Plastics components.Determination of dimensions
• GB/T 8923.1 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 coa
• SY/T 0315 Technological specification of external fusion bonded epoxy coating for steel pipeline

GB/T 26255-2022 history

• 2022 GB/T 26255-2022 Steel-plastic-transition fittings for polyethylene(PE) piping systems for the supply of gaseous fuels
• 2011 GB/T 26255.2-2010 Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels.Part 2:Metal fittings for pipes of nominal outside diameter greater than 63 mm