Standard No.:	GB/T 32270-2015
English Name:	Pressure piping code―Power piping
Chinese Name:	压力管道规范 动力管道
Chinese Classification:	J74    Pressure vessel
Professional Classification:	GB    National Standard
Source Content Issued by:	AQSIQ;SAC
Issued on:	2015-12-10
Implemented on:	2016-7-1
Status:	superseded
Superseded by:	GB/T 32270-2024
Superseded on:	2024-4-25
Target Language:	English
File Format:	PDF
Word Count:	39000 words
Translation Price(USD):	1170.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the basic requirements of materials, design, fabrication, erection, inspection, test, safety protection, insulation and corrosion resistance of piping with steam, water as well as flammable, explosive, toxic and corrosive liquid or gas as the medium within the battery limit of thermal power plants. Reference shall be made to GB/T 20801 for piping with flammable, explosive, toxic and corrosive liquid or gas as medium. This standard is not applicable to the following piping: a) boiler body piping; b) nuclear power plant piping; c) piping for heating, ventilation and air conditioning as well as those with non-circular cross section; d) piping for various towers, building frames, storage vessels, mechanical equipment and instruments. This standard does not include the material requirements of nonmetal piping. See Figures 1 and 2 for the boundary between the piping specified in this standard and those within the boiler body. 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 150-2011 (all parts) Pressure vessel GB/T 229 Metallic materials - Charpy pendulum impact test method GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method GB/T 700-2006 Carbon structural steels GB 713-2014 Steel plates for boilers and pressure vessels GB/T 1048 Pipework components - Definition and selection of PN GB 3087 Seamless steel tubes for low and medium pressure boiler GB/T 3091 Welded steel pipes for low pressure liquid transmission GB/T 3274 Hot-rolled plates, sheets and strips of carbon structural steels and high strength low alloy structural steels GB/T 4622.2-2008 Dimensions for spiral wound gaskets for pipe flanges GB 5310 Seamless steel tubes and pipes for high pressure boiler GB/T 7233 (all parts) Steel castings - Ultrasonic examination GB/T 8163 Seamless steel pipes for liquid service GB 8624 Classification for burning behavior of building materials and products GB/T 8923 (all parts) Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness GB/T 9115 Butt-welding steel pipe flange GB/T 9116 Hubbed slip-on-welding steel pipe flanges GB/T 9119 Slip-on-welding plate steel pipe flanges GB/T 9123 Steel pipe blank flanges GB/T 9124 Specification for steel pipe flanges GB/T 9125 Fasteners for steel pipe flange joints GB/T 12228 General purpose industrial valves - Specification of carbon steel forgings GB/T 12229 General purpose industrial valves - Specification of carbon steel castings GB/T 12230 General purpose industrial valves - Specification of stainless steel castings GB/T 12241-2005 Safety valves - General requirements GB/T 12242-2005 Performance test code - Pressure relief devices GB/T 12243-2005 Spring loaded safety valves GB/T 12777 General specification for metal bellows expansion joints GB/T 13298-1991 Inspection methods of microstructure for metals GB/T 13927-2008 Industrial valves - Pressure testing GB/T 15957-1995 Corrosivity classification of atmospheric environment GB/T 16253 Steel castings for pressure purposes GB/T 17116 (all parts) Pipe supports and hangers GB/T 17186 Calculating method for strength steel pipe flanged joint GB/T 17394 Metallic materials - Leeb hardness test GB/T 20801-2006 (all parts) Pressure piping code - Industrial piping GB 50016 Code for fire protection design of buildings GB 50021 Code for investigation of geotechnical engineering GB 50126 Code for construction of industrial equipment and pipeline insulation engineering GB 50185 Code for acceptance of construction quality of industrial equipment and pipeline insulation engineering GB 50229 Code for design of fire protection for fossil fuel power plants and substations GB 50264 Code for design of industrial equipment and pipeline insulation engineering GB 50764-2012 Design code of power of piping for power plant DL/T 438-2009 The technical supervision codes for metal in fossil-fuel power plant DL/T 515-2004 Pipe bends for power station DL/T 868-2014 The code of welding procedure qualification DL/T 869-2012 The code of welding for power plant DL/T 991-2006 Spectral analysis guideline of metal for electrical power equipment DL/T 5072-2007 Code for designing insulation and painting of fossil fuel power plant JB/T 3223 Welding material quality management specifications JB/T 4730 (all parts) Nondestructive testing of pressure equipments JB/T 5263 Specification for steel casting for power station valves JB/T 6439 Methods of magnetic examination for valves JB/T 6440 Methods of radiographic examination for steel castings valves JB/T 6902 Methods for liquid penetrant examination of valves JB/T 7927 Valve cast steel visual quality requirements JB/T 9625 Specification for pressure retaining casting of biller pipe fittings JB/T 9626 Specification for biller forging JB/T 10087 Specifications for steel casting of steam turbines for pressure purposes NB/T 47008 Carbon and alloy steel forgings for pressure equipment NB/T 47009 Low alloy steel forgings for low temperature pressure equipment NB/T 47010 Stainless and heat-resisting steel forgings for pressure equipments NB/T 47014 Welding procedure qualification for pressure equipment SY/T 5037 Submerged arc-welded steel pipe for common fluid service pipeline SY/T 5038 Longitudinal seam HFW steel pipe for common fluid service pipeline TSG D0001 Pressure pipe safety technology supervision regulation for industrial pressure pipe   3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 piping piping that consists of pipe components, pipe supports and hangers, etc., which is used to transport, distribute, mix, separate, discharge, measure or control fluid flow 3.2 piping system a group of piping formed by connecting one or more piping divided according to fluid and design conditions 3.3 piping component components used to connect or assemble into piping, including pipe, pipe fitting, flange, gasket, fastener, valve, filter mesh and compensator 3.4 pipe or tube piping component with circular cross section for conveying fluid 3.5 pipe fitting a category of piping component, including bend or elbow, tee, branch, reducer and seal head 3.6 piping assembly assembly composed of such pipes, pipe fittings, elbows and flanges as are separately numbered according to piping design 3.7 manufacture production process of products such as piping component and piping supports and hangers 3.8 fabrication process of connecting pipe fittings and pipes into piping assembly through working procedures such as cutting, groove preparation, bending, forming, welding, heat treatment, etc. in a shop or in the field before piping erection 3.9 erection process of putting a piping system in place completely according to the regulations of piping design 3.10 test a method for confirming the quality characteristics of products stipulated jointly by the owner and the manufacturing, fabricating and erection units according to the standards or regulations, including hydraulic test, air tightness test, etc. 3.11 verification process of document confirmation of the received piping components and supports and hangers by the power piping manufacturing unit or erection unit 3.12 receiving acceptance process of confirmation of the received piping components and supports and hangers by the power piping manufacturing unit or erection unit through verification and/or inspection 3.13 branch connection structure leading branch from the main pipe, including integrally reinforced tee fittings and branch connection without reinforced welded structures 3.14 liquid collecting pocket (drain leg) device for collecting condensed water set at the low point of gas or steam piping 3.15 sway brace device for controlling low-frequency and high-amplitude sloshing or high-frequency and low-amplitude vibration of piping 3.16 snubber device for bearing seismic load or impact load of piping, controlling high-speed vibration displacement of piping system, and allowing piping system to expand and contract freely with the change of temperature 3.17 stress intensification factor ratio of the maximum bending stress produced by bending pipe, elbow, reducer and tee fitting under the action of bending moment to that produced by straight pipe bearing the same bending moment, or ratio of the fatigue strength of straight pipe to that of bending pipe, elbow, reducer and tee fitting under the action of the same alternating bending moment 3.18 cold spring elastic deformation applied to the piping in advance when erecting the piping to produce the expected initial displacement and stress, thereby reduce the stress in initial hot state as well as the acting force and moment of the pipe end in initial hot state 3.19 flexibility ability of the piping to absorb displacement deformation caused by thermal expansion, cold contraction and others through its own deformation 3.20 hot displacement change of position of the piping system at the supporting and hanging point between cold and hot states

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Grading of piping 5 Materials 6 Design and calculation 7 Fabrication and erection 8 Inspections and tests 9 Safety protection 10 Insulation and anti-corrosion Annex A (Normative) Allowable stress of materials Annex B (Informative) Physical properties of commonly used materials Annex C (Normative) Flexibility factors and stress intensification factors Annex D (Informative) Common data for fabrication and erection Annex E (Normative) Assembly deviations for piping prefabrication Annex F (Normative) Calculations for safety relief devices