Standard No.:	GB/T 26002-2025
English Name:	Stainless steel pliable corrugated tubing and fittings used in gas piping systems
Chinese Name:	燃气输送用不锈钢波纹软管及管件
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-03-28
Implemented on:	2025-10-1
Status:	valid
Superseding:	GB/T 26002-2010 Stainless steel pliable corrugated tubing and fittings used in gas piping systems
Target Language:	English
File Format:	PDF
Word Count:	14500 words
Translation Price(USD):	435.0
Delivery:	via email in 1~5 business day

GB/T 26002-2025 Stainless steel pliable corrugated tubing and fittings used in gas piping systems English, Anglais, Englisch, Inglés, えいご This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered. ICS 91.140 CCS P 47 National Standard of the People’s Republic of China GB/T 26002-2025 Replaces GB/T 26002-2010 Stainless steel pliable corrugated tubing and fittings used in gas piping systems Issue date: 2025-03-28 Implementation date: 2025-10-01 Issued by the State Administration for Market Regulation the Standardization Administration of the People's Republic of China Contents Foreword 1 Scope 2 Normative references 3 Terms and definitions 4 Specifications, classification and model preparation 5 Materials, appearance, structure and dimensions 6 Performance requirements 7 Test methods 8 Inspection rules 9 Signs and installation instructions 10 Packaging, transportation and storage Annex A (Normative) Outer dimensions of hoses and thread specifications for pipe fittings connections Bibliography Stainless steel pliable corrugated tubing and fittings used in gas piping systems 1 Scope This document specifies the product specifications, classification and model preparation, materials, appearance, structure and dimensions, performance requirements, test methods, inspection rules and markings, installation instructions, packaging, transportation and storage of stainless steel corrugated hoses and fittings for gas transmission. This document is applicable to stainless steel corrugated hoses and fittings used in transportation systems with urban gas as the medium, nominal size not exceeding DN32, and nominal pressure (PN) not exceeding 0.2MPa. This document does not apply to stainless steel corrugated hoses and fittings used for gas transportation with a medium containing dimethyl ether. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions 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 191 Packaging - Pictorial marking for handling of goods GB/T 1220 Stainless steel bars GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 3280 Cold rolled stainless steel plate, sheet and strip GB/T 5231 Designation and chemical composition of wrought copper and copper alloys GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 1: Taper internal and external threads GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads GB/T 8815 Plasticized polyvinyl chloride （PVC）compounds for wire and cable GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests GB/T 15065 Black polyethylene compounds for wire and cable GB/T 23658 Elastomeric seals - Material requirement for seals used in pipes and fittings carrying gaseous fuels and hydricarbon fluid 3 Terms and definitions The following terms and definitions apply to this document. 3.1 stainless steel pliable corrugated tubing used in gas piping systems stainless steel corrugated hose with an outer coating, designed for gas delivery systems, whose length cannot be determined before construction and needs to be finalized on-site Note: hereinafter referred to as “hose”. 3.2 fitting general term for on-site installed connecting components such as straight couplings, elbows, and tees, which are used to connect hoses to other gas pipelines (or accessories) 3.3 the tube without protection coat corrugated tube that has undergone solution treatment and is free of a coating Note: A corrugated tube refers to a tubular shell with a corrugated generatrix. 3.4 protecting coat covering material applied to the hose for protecting the tube without protecting coat (the base tube) [Source: GB 41317-2024,3.4, modified] 3.5 leak-hunting ability function that detects gas leakage inside the base tube (the tube without protecting coat) by utilizing the gas-permeable performance of the protecting coat and fittings 4 Specifications, classification and model preparation 4.1 Specifications Hoses and fittings are classified into nominal sizes of DN10, DN13, DN15, DN20, DN25, and DN32. 4.2 Classification of pipe fittings 4.2.1 Divided by function into the following two type: a) Pipe fittings with leak detection function, code X; b) Pipe fittings without leak detection function, without code. 4.2.2 According to external types, it can be divided into the following three types: a) S-type (straight through); b) L-shaped (bend); c) T-shaped (three-way). 4.3 Model designation 4.3.1 Hose The rules for the designation of hose models are as follows: Example: The model of stainless steel corrugated hose for gas transmission with a nominal size of DN15 is represented as: RSB-15-GB/T 26002 4.3.2 Pipe fittings The rules for numbering pipe fittings are as follows: Note: The nominal size of the pipe fittings is expressed in the order of the nominal size of the front end, middle end, and rear end. Example 1: The model of the front end connected to a DN15 nominal size hose, the rear end connected to a DN15 nominal size gas pipeline, and the straight through pipe fittings with leak detection function are represented as: RBG-X-S15 × 15-GB/T 26002 Example 2: The model of the front end connected to a DN20 nominal size hose, the rear end connected to DN15 and DN20 nominal size gas hoses respectively, and the three-way pipe fittings without leakage detection function are represented as: RBG-T20 × 15 × 20-GB/T 26002 5 Materials, appearance, structure and dimensions 5.1 Materials 5.1.1 Raw pipes and fittings should be made of materials specified in Table 1 or other materials with equivalent or higher performance. 5.1.2 The hose coating shall comply with the provisions of relevant standards such as GB/T 8815 and GB/T 15065.