GB/T 2550-2025 Gas welding equipment—Rubber hoses for welding, cutting and allied processes English, Anglais, Englisch, Inglés, えいご
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ICS 25.160.30;83.140.40 CCS G42
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 2550-2025 Replaces GB/T 2550-2016
GAS WELDING EQUIPMENT—RUBBER HOSES FOR WELDING, CUTTING AND ALLIED PROCESSES
Issued on August 29, 2025
Implemented on March 1, 2026
Issued by State Administration for Market Regulation
Standardization Administration of China
Contents
1 Scope
2 Normative References
3 Terms and Definitions
4 Abbreviations
5 Application
6 Hose Design
7 Materials
8 Dimensions and Tolerances
9 Requirements and Type Testing
10 Hose Colors and Markings
1 Scope
This document specifies requirements for rubber hoses (including twin hoses) used for welding, cutting, and allied processes.
This document covers:
Conventional rubber hoses (2.0 MPa maximum working pressure)
Lightweight rubber hoses (≤1.0 MPa maximum working pressure with inner diameter ≤6.3 mm)
Acetylene hoses (0.3 MPa maximum working pressure)
This document applies to hoses operating at temperatures from -20°C to +60°C for:
Gas welding and cutting
Arc welding under inert/reactive gas shielding
Allied processes including heating, brazing, and metal spraying
This document does not apply to thermoplastic hoses or high-pressure acetylene hoses (>0.3 MPa).
2 Normative References
The following documents contain provisions that, through reference in this text, constitute essential clauses of this document. For dated references, only the edition cited applies; for undated references, the latest version (including amendments) applies.
GB/T 528 Vulcanized or thermoplastic rubber—Determination of tensile stress-strain properties
GB/T 1690 Vulcanized or thermoplastic rubber—Resistance to liquid test
GB/T 3512 Vulcanized or thermoplastic rubber—Accelerated aging and heat resistance test
GB/T 5563 Rubber and plastic hoses and assemblies—Hydraulic pressure test
ISO 11114-3 Gas cylinders—Compatibility of cylinder and valve materials with gas contents—Part 3: Autogenous ignition test for non-metallic materials
3 Terms and Definitions
Terms defined in GB/T 7528 and ISO 15296, as well as the following, apply to this document:
3.1 Twin hose Two standard rubber hoses connected longitudinally in parallel
3.2 Universal fuel gas hose For all gases except flux-containing welding gases
3.3 Flux fuel gas hose For gases containing welding flux
4 Abbreviations
LPG Liquefied petroleum gases
MPS Methylacetylene-propadiene mixtures
