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GB/T 20801.3-2020: Pressure piping code - Industrial piping - Part 3: Design and calculation Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 20801.3: Historical versions
Similar standardsGB/T 20801.3-2020: Pressure piping code - Industrial piping - Part 3: Design and calculation---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20801.3-2020GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.040 J 74 Replacing GB/T 20801.3-2006 Pressure piping code - Industrial piping - Part 3. Design and calculation Issued on. NOVEMBER 19, 2020 Implemented on. JUNE 01, 2021 Issued by. State Administration for Market Regulation; Standardization Administration of PRC. Table of ContentsForeword... 3 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 14 4 Design conditions and design criteria... 16 5 Piping components... 29 6 Pressure design of piping components... 50 7 Stress analysis of pipeline... 70 8 Pipe support & hanger... 85 Appendix A (Informative) Calculation of wind load and seismic load... 96 Appendix B (Informative) Piping layout... 105 Appendix C (Informative) Comparison of common industrial valve standards with foreign general petrochemical valve standards... 121 Appendix D (Informative) General requirements for stem seals of low leakage valves... 126 Appendix E (Informative) Calculation example... 129 Appendix F (Informative) Reinforcement calculation by pressure area method ... 140 Appendix G (Normative) Flexibility factor and stress increase factor... 142 Appendix H (Informative) Dynamic load analysis of valves in piping system when opening and closing... 146 Appendix I (Informative) Allowable load of static equipment nozzle... 151 Appendix J (Normative) Corrugated metal expansion joint... 154 References... 1621 ScopeThis Part of GB/T 20801 specifies the basic requirements for the design and calculation of pressure pipelines. These basic requirements include design conditions, design criteria, piping components and their pressure design, pipeline stress analysis, etc. This Part applies to the design and calculation of pressure piping, which is defined within the scope of GB/T 20801.1.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard. GB/T 150 (all parts) Pressure vessel GB/T 196 General purpose metric screw threads - Basic dimensions GB/T 197 General purpose metric screw threads - Tolerances GB/T 1031 Geometrical product specifications (GPS) - Surface texture. Profile method - Surface roughness parameters and their values GB/T 1047 Pipework components - Definition and selection of nominal size GB/T 1048 Pipework components - Definition and selection of PN GB/T 3287 Malleable cast iron pipe fittings GB/T 3420 Gray iron castings for pipe fittings GB/T 3422 Cast-iron pressure pipe made by continuous casting process GB/T 5625 Flared couplings - Straight thread GB/T 5626 Flared couplings - Male GB/T 5627 Flared couplings - Male long GB/T 5628 Flared couplings - Union GB/T 5629 Flared couplings - Male elbow GB/T 5630 Flared couplings - Union elbow GB/T 5631 Flared couplings - Straight thread elbow GB/T 5632 Flared couplings - Swivel elbow GB/T 5633 Flared couplings - Straight thread branch tee GB/T 5634 Flared couplings - Swivel run tee GB/T 5635 Flared couplings - Male branch tee GB/T 5637 Flared couplings - Straight thread run tee GB/T 5638 Flared couplings - Swivel branch tee3 Terms and definitionsThe following terms as defined in GB/T 20801.1-2020, GB/T 20801.2-2020, GB/T 20801.4-2020, GB/T 20801.5-2020, GB/T 20801.6-2020, as well as the following terms and definitions, apply to this document. 3.1 Piping system Pipelines, which are determined by the same design conditions AND connected to each other. 3.2 Elevated temperature fluid service The use temperature of the material is in a working condition where the high- temperature strength reduction factor W of the welded joint is less than 1 (see 4.2.7 and Table 5), which is equivalent to the working condition where the working temperature is within the allowable stress temperature range, which is determined by the long-term strength of the material. 3.3 Fluid service A comprehensive term, which involves the application of piping systems; takes into account fluid properties, operating conditions and other factors; forms the basis of piping system design. 3.4 Severe cyclic conditions 3.5 Branch connection fitting The integral reinforcing fittings, which connect the branch to the trunk pipe, through butt welding connection, socket welding connection, threaded connection. 3.6 Rating value The pressure value of the piping components, which are specified by the standard.4 Design conditions and design criteria4.1 Design conditions 4.1.1 Design pressure 4.1.2 Design temperature 4.1.3 Load conditions 4.1.4 Additional thickness 4.1.5 Environmental influence 4.2 Design criteria 4.2.1 Pressure-temperature design criteria for piping components The pressure-temperature design of piping components shall adopt one of the methods specified in 4.2.1.1 ~ 4.2.1.4. 4.2.2 Pressure-temperature design criteria of piping system The pressure-temperature design of the piping system shall meet the following requirements. 4.2.3 Allowable range of change of pressure and temperature 4.2.3.1 When determining the design pressure and design temperature, it shall consider the pressure and temperature changes, that occur during the operation of the piping system. 4.2.3.4 Occasional changes in pressure, which exceed the design conditions, shall be limited to any of the following ranges. 4.2.4 Allowable stress 4.2.5 Factor of longitudinal welded joint Φw The longitudinal welding joint factor Φw, of pipes and butt-welded fittings, shall be determined, according to the criteria specified in Table 3 or Table A.3 of GB/T 20801.2-2020. 4.2.6 Casting's quality factor ΦC 4.2.6.1 The casting quality factor ΦC of iron castings (grey cast iron, ductile iron, malleable cast iron) takes 1.0. 4.2.6.2 Except for cast iron, static metal castings in Table A.1 of GB/T 20801.2- 2020 shall be visually inspected, according to JB/T 7927.It shall not be lower than the requirements of grade B. The casting's quality factor shall be taken as 0.8. 4.2.6.3 For castings that require additional non-destructive testing, it can use the casting quality factor in Table 4.However, the change in the casting quality factor ΦC does not affect the pressure-temperature ratings of the piping components. 4.2.7 High temperature strength reduction factor W of welded joints5 Piping components5.1 Selection of piping components 5.1.1 General provisions The piping components shall be selected, according to the nature of the fluid, various possible operating conditions, the requirements of the external environment, economic rationality. 5.1.2 Pipes and butt-welding fittings 5.1.3 Bend 5.1.4 Miter elbow (shrimp elbow) 5.1.5 Short radius elbow The short radius elbow and short radius return elbow (R = 1.0D) shall meet the requirements of GB/T 12459. 5.1.6 Flanging joint 5.1.7 Branch pipe connection and its fittings 5.1.8 Flange 5.1.9 Gasket 5.1.10 Fasteners 5.2 Selection of connection form of piping components 5.2.1 General provisions The selection of the connection form of the piping components shall be compatible with the pipeline material and fluid working conditions. Meanwhile, it shall consider the influence of pressure, temperature, external load on the sealing performance and mechanical strength of the connection joint, under the expected use and test conditions. 5.2.2 Welded joints 5.2.3 Flange connection 5.2.4 Expansion joint 5.2.5 Thread-sealed pipe thread connection 5.2.5.1 The pipe thread type of the thread seal shall meet the requirements of Table 11. 5.2.6 Straight thread connection The straight thread connection joint can adopt the structure, as shown in Figure 4, to be sealed by a pair of contact surfaces (non-threaded sealing); it is only suitable for grade GC3 pipelines. 5.2.7 Connection of flaring and non-flaring compression fittings 5.2.8 Packed connector The packed connector shall meet the following requirements. 5.3 Type and size standards of piping components6 Pressure design of piping components6.1 Straight pipe 6.1.1 Symbols 6.1.2 Internal pressure design of straight pipe The internal pressure design of the straight pipe shall meet the following requirements. 6.1.3 Design of external pressure (or vacuum) of straight pipe The external pressure (or vacuum) design of the straight pipe shall meet the following requirements. 6.2 Bend or elbow 6.2.1 Symbols 6.2.2 Internal pressure design of bend or elbow The calculated thickness of the bend or elbow (located at α/2) shall be determined, according to formula (3). 6.2.3 Design of external pressure (or vacuum) of bend or elbow The design of the external pressure (or vacuum) of the bend or elbow shall be carried out, in accordance with the provisions of 6.1.3.The calculated length L is taken as the distance, between two adjacent support lines, on the straight pipe, including those along the axis of the bend or elbow. 6.3 Miter elbow 6.3.1 Symbols 6.3.2 Internal pressure design of miter elbow The internal pressure design of the miter elbow shall meet the following requirements. 6.3.3 The external pressure (or vacuum) design of the miter elbow The external pressure (or vacuum) design of the miter elbow shall be carried out, in accordance with the provisions of 6.1.3; however, the calculated length L shall be taken as the distance, between the two adjacent support lines of the straight pipe, including the axis of each segment of the miter elbow. 6.4 Pressure design and external load evaluation of pipe flanges and blind flange 6.4.1 Symbols 6.4.2 Pressure-temperature ratings of standard pipe flanges The standard pipe flanges and blind flanges, which are listed in Table 13, are selected according to the pressure-temperature ratings, which are specified in the standard. 6.4.3 Pressure design verification of standard pipe flanges With the consent of the designer, the allowable pressure-temperature value (maximum allowable working pressure) of the standard pipe flange can also be determined, according to the design method of non-standard flanges, which are listed in 6.4.4 [Taylor (Taylor Forge) method]. 6.4.4 Pressure design of non-standard flanges The pressure design (maximum allowable working pressure) of non-standard flanges and blind flanges shall comply with the Taylor method, which is specified in GB/T 17186.1.However, the allowable stress of the flange and bolt materials shall comply with the relevant requirements of GB/T 20801.When using the flange tightening measures to control the bolt installation load, the bolt's design load and the flange torque, in the pre-tightened state, are calculated according to the required bolt area Am, regardless of the actual bolt area Ab. 6.4.5 External load evaluation of pipe flanges When the pipe flange bears an applied axial force or an applied bending moment, it can be evaluated according to one of the following methods. 6.4.6 Flange stiffness When necessary, the flange rigidity can also be checked, according to the provisions of GB/T 17186.1. 6.5 Blind plate 6.5.1 Symbols 6.5.2 Calculated thickness of blind plate The calculated thickness of the blind plate shall be calculated, according to formula (14). 6.6 Other piping components For the pressure design of other piping components, such as reducers, convex heads and flat heads, it shall be carried out in accordance with relevant standards. 6.7 Equal area reinforcement method for branch pipe connections 6.8 Calculation of pressure area method for integrally formed tee and branch pipe connections7 Stress analysis of pipeline7.1 General provisions 7.1.1 This Chapter gives analysis methods and evaluation criteria, for various possible loads and stresses, which are generated in piping components. If it needs to consider the fatigue effect of pressure fluctuations on piping components, it can follow the analysis method and evaluation criteria, which is given in JB 4732.Meanwhile, in the flexibility analysis of 7.5.5, the reduction factor f of the allowable stress range in the formulas (34) and (35) is taken as 1.0. 7.1.2 The flexibility analysis method, which is described in this Chapter, is not applicable to brittle materials, such as cast iron. 7.1.3 When conducting stress analysis of the piping system, it shall consider the stiffness of expansion joints and other piping components. The flexibility factor and stress increase factor, of various piping components, can be calculated, according to the formulas listed in Table G.1 in Appendix G. The designer can also use more accurate values, which are obtained by experiments or other methods. 7.1.4 The number, position, type of supports & hangers, in the piping system, have a great influence on the stress distribution of the piping system. In the design, the arrangement of supports & hangers shall be treated with care, to reduce the stress of the pipeline. The design of the piping system shall ensure that, each support & hanger has sufficient strength and appropriate rigidity. 7.2 Scope and method of pipeline stress analysis 7.2.1 All pipelines shall be subjected to stress analysis. In engineering design, it should determine the analysis method and level of detail, according to the temperature, pressure, diameter of the pipeline and the type of connected equipment. 7.3 Symbols Unless otherwise specified, the symbols in this Chapter are the same as those in Chapter 6. 7.4 Load and its combination conditions 7.5 Static stress analysis and strength conditions8 Pipe support & hanger8.1 General provisions 8.1.1 The arrangement and type of pipeline supports & hangers shall be compatible with the pipeline layout, pipeline flexibility, anti-vibration design, bearing size and rooting conditions of the supports & hangers; the following conditions shall be prevented. 8.2 Material requirements 8.3 Design requirements 8.3.1 General provisions 8.3.2 Structure 8.3.3 Load 8.4 Setting and selection of pipe supports & hangers 8.4.5 Guide frame The guide frame can be set according to the following principles. 8.4.6 Anti-vibration bracket The anti-vibration bracket can be set, according to the following principles. 8.4.7 Limiting frame In order to control the displacement of thermal expansion and contraction of the pipeline OR reduce the thrust or moment of the pipeline on the constraint points (such as equipment nozzles, fixation points, etc.), it may set limiting frames at appropriate positions. 8.4.8 Others For pipelines with expansion joints, the design of layout, fixation bracket, limiting frame shall meet the requirements of Appendix J. The layout of other types of pipeline supports & hangers shall also meet the requirements of the expansion joint product description. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 20801.3-2020 be delivered?Answer: The full copy PDF of English version of GB/T 20801.3-2020 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 20801.3-2020_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 20801.3-2020_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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