Standard No.:	TSG 31-2025
English Name:	Safety Technology Regulation for Industrial Pressure Pipe
Chinese Name:	工业管道安全技术规程
Professional Classification:	TSG    Special Equipment Safety Specification
Source Content Issued by:	SAMR
Issued on:	2025-10-15
Implemented on:	2026-1-1
Status:	to be valid
Superseding:	TSG D0001-2009 Pressure Pipe Safety Technology Supervision Regulation for Industrial Pressure Pipe TSG D7005-2018 Periodic Inspection Regulation for Industrial Pressure Piping
Target Language:	English
File Format:	PDF
Word Count:	42500 words
Translation Price(USD):	1350.0
Delivery:	via email in 1 business day

TSG 31-2025 Safety Technology Regulation for Industrial Pressure Pipe, English, Anglais, Englisch, Inglés, えいご replaces TSG D0001-2009 Pressure pipe safety technology supervision regulation for industrial pressure pipe (English) and TSG D7005-2018 Periodic Inspection Regulation for Industrial Pressure Piping (English) Safety technology regulation for industrial pressure pipe 1 General provisions 1.1 Purpose This Regulation is formulated in accordance with the Special Equipment Safety Law of the People's Republic of China and the Regulations on the Safety Supervision of Special Equipment, in order to ensure the safe use of industrial pressure pipes, prevent and reduce accidents, protect the safety of people's lives and property, and promote economic and social development. 1.2 Scope This Regulation is applicable to industrial pressure pipes defined in the Special Equipment Directory that simultaneously meet the following conditions: (1) The maximum operating pressure is greater than or equal to 0.1 MPa (gauge pressure, same below) and not greater than 100 MPa (Note 1-1); (2) The nominal diameter is greater than or equal to 50 mm; (3) The conveyed medium is gas, liquefied gas, steam, or liquid that is combustible (flammable), explosive, toxic, corrosive, and has a maximum operating temperature higher than or equal to its standard boiling point. Industrial pressure pipes (hereinafter referred to as pipes) include process pipes belonging to process units, auxiliary units, and utilities within the battery limit (Note 1-2); power pipes used in thermal power plants for conveying steam and steam-water two-phase media; and refrigeration pipes. Note 1-1: Pipes with a maximum operating pressure greater than or equal to 42 MPa are uniformly referred to as high-pressure pipes in this Regulation. Note 1-2: The demarcation point between industrial pressure pipes, long-distance pipelines, and public pipelines is generally the block valve (isolation valve). The boundary dividing process pipelines within oil and gas transmission stations from the main line pipelines is generally the station inlet/outlet block valve (isolation valve), or determined by the pipe user. 1.3 Special provisions for scope (1) Process pipes within oil and gas transmission stations in long-distance pipeline systems and airport fuel supply pipes (Note 1-3) shall comply with this Regulation; (2) Cryogenic insulated pipes, pipes inside cold boxes (including those inside cryogenic pump boxes), jacketed pipes, pipes inside mother-daughter tanks, and other pipe sections or piping systems with concealed characteristics or which are not suitable for disassembly and inspection during service life shall comply with the requirements of Clauses 1 to 5 of this Regulation. Note 1-3: Airport fuel supply pipes include airport oil depot pipes and apron refueling pipes. 1.4 Exclusions This Regulation does not apply to the following pipes: (1) Pipes for military equipment and nuclear facilities; (2) Pipes on offshore facilities and in mine shafts; (3) Dedicated pipes on mobile equipment, such as railway locomotives, automobiles, ships, aerospace vehicles, etc.; (4) Pipes for petroleum, natural gas, geothermal exploration, development, and extraction installations, as well as oil and gas field gathering and transmission pipelines; (5) Pipes with a nominal diameter less than 150 mm and a maximum operating pressure less than 1.6 MPa (gauge pressure) conveying non-toxic, non-flammable, non-corrosive gases (excluding liquefied gases, steam, and oxygen); (6) Pipes integral to equipment (Note 1-4). Note 1-4: Internal pipes and external pipe connections of equipment such as pumps and compressors (excluding pipes connecting multiple stages on-site), steam turbines, gas turbines, internal combustion engines, packaged refrigeration units, quick-freezing devices, and other fluid conveying or processing equipment. 1.5 Definition of pipe scope The scope of pipes applicable under this Regulation includes pipe components, pipe supporting elements, connection joints, mechanical safety interlock devices, and instruments. (1) Pipe components refer to parts used to connect or assemble into a closed pressure piping system, including pressure piping elements, safety accessories, as well as non-ferrous metal (non-ferrous metal alloy) pipe fittings, cast pipe fittings, flexible joints, pressure hoses, fasteners, cryogenic insulated pipes, directly buried jacketed pipes, sight glasses, and throttling devices in pipelines (such as orifice plates), etc. (Note 1-5); (2) Pipe supporting elements, including hanger rods, spring hangers and supports, diagonal tie rods, counterweights, turnbuckles, support rods, chains, guides, saddles, bases, rollers, cradles, sliding supports, lugs, pipe hangers, shackles, pipe clamps, U-bolts, and clamp plates, etc.; (3) Connection joints, including joints between pipe components, the first connection joint where the pipe connects to equipment or devices (welds, flanges, seals, fasteners, etc.), and joints connecting pipes to non-pressure components; (4) Mechanical safety interlock devices and instruments. Note 1-5: (1) Pressure piping elements include pressure piping tubes, pressure piping fittings, pressure piping valves, pressure piping flanges, expansion joints, pressure piping sealing elements, and pressure piping special elements; where, pressure piping special elements include anti-corrosion piping elements and element combination assemblies; element combination assemblies refer to devices formed by combining pressure piping elements such as tubes, fittings, valves, flanges, expansion joints, sealing elements, etc. (by welding, flanged connection, etc.) to possess a specific function, including gas pressure regulating stations, attemperators and pressure reducing stations, flame arresters, flowmeter (housings) (Note 1-6), and factory prefabricated pipe spools (Note 1-7); (2) Safety accessories refer to safety valves, bursting disc devices, and emergency shut-off valves used on pipes. Note 1-6: Flowmeter (housing) refers to a housing made from tubes, plate coils, castings, forgings, flanges, pipe fittings, etc., through machining or welding, that withstands the internal medium pressure of the flowmeter. Note 1-7: Factory prefabricated pipe spools refer to pipe element products where the manufacturer welds or flange-connects pressure piping elements into an integral assembly according to construction design drawings within the factory for shipment as a whole, including: manifolds, filters, separators, drip legs (drip pots), dirt traps, mixers, buffers, pig launchers/receivers, insulated joints, loading arms, etc., excluding pipe prefabrication performed at the construction site. 1.6 Grading of piping Pipes within the scope of this Regulation are graded into GC1, GC2, and GCD levels according to design pressure, design temperature, medium toxicity, corrosiveness, and fire hazard. The classification of pipe grades and the degrees of medium toxicity, corrosiveness, and fire hazard are specified in Annex A of this Regulation. 1.7 Relationship with technical standards and management systems This Regulation specifies the basic safety requirements for pipes. Other technical standards and management systems shall not be lower than the requirements of this Regulation. 1.8 Special provisions for non-conformance with this Regulation Entities adopting new materials, technologies, or processes that are inconsistent with the requirements of this Regulation, or for which this Regulation has no requirements but which may significantly impact safety performance, shall declare to SAMR for implementation of sandbox supervision. SAMR shall organize technical review and approval according to the evaluation and approval procedures for new materials, technologies, and processes. 1.9 Technical standards (1) GB/T 20801 Pressure piping code - Industrial piping and GB/T 32270 Pressure piping code - Power piping are standards that meet the basic safety requirements of this Regulation; (2) The process pipelines in the oil and gas transmission station shall be designed using GB/T 34275 Pressure piping code - Transmission pipeline or GB/T 20801; when GB/T 34275 is adopted for design, the requirements for materials, design, installation, inspection, use, as well as safety accessories, flame arresters, and mechanical safety interlock devices shall comply with the requirements of GB/T 34275; (3) When other standards are adopted, the design documents or engineering specifications shall include a declaration of conformity and a comparison table demonstrating compliance with the basic safety requirements of this Regulation (see Annex B). 1.10 Supervision and administration Entities involved in the manufacture of pipe components, and the design, installation (including field fabrication, same below), alteration, repair, and use of pipes, as well as inspection and testing agencies, shall strictly implement this Regulation, and promptly input the required data into the special equipment information management system according to the provisions for special equipment informatization management. 2 Materials, pipe components, and pipe supporting elements 2.1 Materials 2.1.1 General (1) Materials shall meet the requirements of this Regulation, GB/T 20801, GB/T 32270, the relevant material standards, and the design documents; (2) The percentage elongation after fracture for castings and non-ferrous metal materials shall not be less than 14%; for steel metal materials (excluding bolts), it shall not be less than 16%. They shall possess sufficient resistance to brittle fracture at the minimum service temperature. Where metal materials with a percentage elongation after fracture less than 14% must be used for special reasons, necessary protective measures shall be taken. The percentage elongation after fracture for fiber reinforced plastic in non-metallic pipes and the resin materials used for fiber reinforced plastic lined pipes shall not be less than 2.5%; (3) They shall possess sufficient stability under the design service conditions, including physical properties, chemical properties, mechanical properties, corrosion resistance, fatigue resistance, creep resistance, and microstructural stability, etc.; (4) They shall meet the requirements of the corresponding manufacturing and fabrication processes (including forging, casting, welding, cold and hot forming, heat treatment, etc.). The carbon content of carbon steel and low-alloy steel used for welding shall not exceed 0.30%; (5) When several different materials are used in combination, potential adverse effects shall be considered. 2.1.2 Use of materials with foreign designations (1) Materials with foreign designations shall be those permitted by current foreign pressure piping standards and specifications, and shall have instances of use under similar operating conditions abroad; their scope of use shall meet the requirements of this Regulation, GB/T 20801, and GB/T 32270; (2) The chemical composition of materials with foreign designations shall be comparable to similar materials in China, and their properties shall not be lower than the requirements of this Regulation; (3) The materials and their quality documentation shall be reviewed, and verification re-tests of the chemical composition and mechanical properties of the materials shall be conducted. The materials can only be put into use after the actual measured values from the re-test results meet the requirements of this Regulation, GB/T 20801, GB/T 32270, and their material standards; (4) Before initial use, the weldability of the material shall be mastered, and welding procedure qualification shall be performed; (5) The re-test results and the procedure qualification report shall be included in the product quality documentation; (6) When a domestic manufacturer produces materials with foreign designations, an enterprise standard shall be established. 2.1.3 Use of new materials 2.1.3.1 Materials not listed in the relevant standards adopted by this Regulation For materials used that are not listed in GB/T 20801 or GB/T 32270, nor listed in national or industry standards dedicated to pressure piping or pressure equipment, the pressure piping elements manufactured from them shall pass the test verification by a special equipment type testing agency, and after a type test report is issued, technical review shall be conducted according to the requirements of 1.9 of this Regulation. 2.1.3.2 Materials already listed in standards dedicated to pressure piping or pressure equipment For materials used that are not listed in GB/T 20801 or GB/T 32270, but are already listed in national or industry standards dedicated to pressure piping or pressure equipment, before initial use, the material development unit shall provide necessary material data (including chemical composition, tensile mechanical properties, fatigue test data, fracture toughness, and other performance parameters meeting the requirements for the material's scope of use). The pressure piping elements manufactured from them shall pass the test verification by a special equipment type testing agency, and a type test report shall be issued proving that all performance indicators meet the requirements of this Regulation and the requirements of the design documents before they can be put into use. 2.1.4 Material substitution Material substitution for pipe components during manufacturing and installation shall obtain written approval from the original design unit. Material substitution for pipe components during alteration and repair shall obtain written approval from the original design unit or a design unit with corresponding qualifications. 2.1.5 Welding materials They shall meet the requirements of this Regulation, GB/T 20801, GB/T 32270, the design documents, and the welding procedure qualification documents.

Contents Foreword i 1 General provisions 2 Materials, pipe components, and pipe supporting elements 3 Design 4 Installation 5 Supervision and inspection 6 Use 7 Periodic inspection 8 Safety accessories, flame arresters, and mechanical safety interlock devices and instruments 9 Supplementary provisions Annex A Classification of industrial pressure pipe grades and the degrees of medium toxicity, corrosiveness, and fire hazard Annex B Comparison table between industrial pressure pipe design documents and the basic safety requirements of this Regulation Annex C Industrial pressure pipe installation quality certificate Annex D Annual inspection of industrial pressure pipe Annex E Industrial pressure pipe periodic inspection report Annex F Notice for inspection opinions on special equipment (1) Annex G Notice for inspection opinions on special equipment (2)