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GB/T 38343-2019: Technical specification for flange joints installation Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 38343-2019: Technical specification for flange joints installation---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/GBT38343-2019GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.040 J 74 Technical Specification for Flange Joints Installation Issued on. DECEMBER 10, 2019 Implemented on. JULY 1, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative References... 4 3 Symbols... 5 4 Determination of Flange Joint Bolt Installation Load... 6 5 Additional Requirements for the Selection of Flanges, Gaskets and Fasteners... 10 6 Installation... 15 7 Inspections, Tests and Markings... 24 8 Records... 25 Appendix A (informative) Flange Installation Stress Calculation... 26 Appendix B (informative) Maximum Bolt Installation Load for Standard Pipe Flange Joints... 28 Appendix C (informative) Recommended Value of Flange Sealing Surface Roughness ... 43 Appendix D (informative) Example of Flange Joint Installation Inspection Record.. 44 Appendix E (informative) Calculation of Bolt Installation Torque Using Friction Coefficient... 46 Bibliography... 49ForewordThis document was drafted in accordance with the rules provided in GB/T 1.1-2009. This document was proposed by and shall be under the jurisdiction of China Standardization Committee on Boilers and Pressure Vessels (SAC/TC 262). The drafting organizations of this Standard. National Technology Center of Process Equipment; East China University of Science and Technology; VALQUA China Research Institute; TET IN-SITU (Shanghai) Electromechanical Equipment & Technology Co., Ltd.; Suzhou Fulaixi Gasket Technology Co., Ltd.; GORE Industrial Products Trading (Shanghai) Co., Ltd.; HYTORC Group Co., Ltd.; China National Chemical Engineering Third Construction Co., Ltd.; Ningbo SINYUAN Industrial Material Group. The main drafters of this Standard. Cai Nuanshu, Ying Daoyan, Cai Renliang, Zheng Xing, Li Tianxin, You Zihan, Guo Quan, Zhai Bin, Xu Junqi, Feng Mei, Cheng Guohua, Lin Jianhong. Technical Specification for Flange Joints Installation1 ScopeThis Standard specifies the method for determining the bolt installation load of circular flange joints with gaskets connected by bolts, as well as additional requirements for the selection, installation preparation, assembly, bolt tightening, inspection, recording, marking and other technical requirements for flange joints (flanges, gaskets and fasteners). This Standard applies to the following “pressure-bearing equipment” flange joints with leakage control requirements. a) TSG D0001 and other corresponding safety technical specifications and regulations; b) GB/T 20801 and other corresponding product standards or engineering specifications; c) User or design requirements. NOTE. the “pressure-bearing equipment” referred to in this Standard includes boilers, pressure vessels (including fixed pressure vessels, mobile pressure vessels and gas cylinders), pressure pipelines, pumps and valves, etc.2 Normative ReferencesThe following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 150.3 Pressure Vessels - Part 3.Design GB/T 17186.1-2015 Calculation Methods for the Pipe Flange Joints - Part 1.Calculation Method Satisfies Both Strength and Rigidity Requirements GB/T 20801.2 Pressure Piping Code - Industrial Piping - Part 2.Materials GB/T 20801.3 Pressure Piping Code - Industrial Piping - Part 3.Design and Calculation GB/T 20801.4 Pressure Piping Code - Industrial Piping - Part 4.Fabrication and Assembly GB/T 20801.5 Pressure Piping Code - Industrial Piping - Part 5.Inspection and Testing HG/T 20592 ~ 20635 Steel Pipe Flanges, Gaskets and Bolting EN 13555 Flanges and Their Joints - Gasket Parameters and Test Procedures Relevant to the Design Rules for Gasketed Circular Flange Connections3 SymbolsThe following symbols are applicable to this document. Aa---gasket contact area, i.e., the area where the gasket directly contacts the flange sealing surface (octagonal gasket is measured by the projected area of the gasket), in mm2; Ab---cross-sectional area of the bolt at the root diameter of the thread or the minimum diameter of the unthreaded part, whichever is smaller, in mm2;4 Determination of Flange Joint Bolt Installation Load4.1 General The strength and rigidity of flange joints under the design conditions and installation conditions shall be respectively evaluated in accordance with 4.2 and 4.3, and the sealing performance under the operating conditions shall be evaluated in accordance with 4.4, and the bolt installation load shall be determined accordingly. 4.2 Strength and Rigidity Evaluation of Flange Joints under Design Conditions 4.3 Strength and Rigidity Evaluation of Flange Joints under Installation Conditions 4.3.1 Bolts 4.3.1.1 Under installation conditions, the bolt installation stress SB shall not exceed 70% of the bolt material yield strength (at installation temperature). The actual bolt installation stress (including installation load deviation) shall not exceed 90% of the bolt material yield strength (at installation temperature). 4.3.2 Gaskets 4.3.2.1 Under installation conditions, the total bolt installation load (WA) is equal to the compressive load on the gasket contact surface (Aa). The compressive stress (QA) on the gasket contact surface shall not be greater than the maximum crushing stress (Qmax) of the gasket, see Formula (1). 4.3.2.2 The maximum crushing stress Qmax of non-metallic flat gaskets shall comply with the following provisions. 4.3.3 Flanges 4.3.3.1 Under installation conditions, the flange shall not produce deformation that affects the seal, and a comprehensive evaluation shall be carried out in accordance with the provisions of 4.3.3.2, 4.3.3.3 and 4.3.3.4. 4.4 Evaluation of Sealing Performance of Flange Joints under Operating Conditions 4.4.1 Under installation conditions, the bolt installation load is the basis for the flange joint to have pressure-bearing - sealing capabilities. As the operating temperature increases and time goes by, due to the combined effects of stress relaxation of the bolt material, gasket creep and flange sealing surface deflection, etc., the bolt installation load will relax and attenuate. 4.4.5 When the user or design has other leakage control requirements or reliable performance parameters (such as. Qmax, Qsmin, RJ, etc.), the corresponding minimum bolt installation stress SBmin can be calculated in accordance with Formula (3), but it shall be indicated in the design documents and installation procedure documents. 4.5 Bolt Installation Load 4.5.1 The maximum bolt installation load is determined as follows. 4.3.1.2, set the bolt installation target stress. 4.5.3 When using different tightening tools and tightening methods, the actual bolt installation load will have certain deviations.5 Additional Requirements for the Selection of Flanges, Gaskets and Fasteners5.1 General The use of maximum bolt installation load control technology can improve the bearing capacity of flange joints, increase the anti-relaxation margin of flange joints, and reduce the leakage rate of flange joints. 5.2 Fasteners 5.2.1 In addition to the selection of fasteners for standard pipe flange joints, which shall comply with the corresponding provisions of HG/T 20592~20635, flange joints assembled using the maximum bolt installation load control technology shall preferentially use high-strength bolts (studs) in accordance with the provisions of 4.3.1.Except for cast iron, non-metallic flanges or rubber gaskets, low-strength bolts (studs) shall not be used. 5.3 Gaskets 5.3.1 In addition to the gasket selection for standard pipe flange joints, which shall comply with the corresponding provisions of HG/T 20592~20635, flange joints assembled using the maximum bolt installation load control technology shall also comply with the additional requirements of 5.3.2~5.3.5. 5.3.2 The stress relaxation coefficient PQR of non-metallic flat gaskets or semi-metallic gaskets at the maximum operating temperature shall be greater than or equal to 0.7.The maximum operating temperature of the gaskets shall comply with the following requirements. 5.3.3 The maximum crushing stress of non-metallic flat gaskets shall comply with the provisions of 4.3.2. 5.3.4 Metal spiral wound gaskets shall comply with the following additional requirements. 5.3.5 Octagonal gaskets shall comply with the following additional requirements. 5.4 Flanges 5.4.1 In addition to the standard pipe flanges, which shall comply with the corresponding provisions of HG/T 20592~20635, the selection of flanges shall also comply with the provisions of 5.4.2 ~ 5.4.4. 5.4.2 The rigidity of the flanges shall be improved, and necked butt-weld flanges, necked slip- on flanges, integral flanges and socket-weld flanges with greater rigidity shall be selected. When using the maximum bolt installation load control technology for assembly, threaded flanges and plate-type flat-weld flanges shall not be used. 5.4.3 The nominal size of socket-weld flanges shall not be greater than DN50.6 Installation6.1 General 6.1.1 This Chapter specifies the basic content of the installation process of flange joints of pressure-bearing equipment. Before installation, an installation procedure document shall be compiled in accordance with the specific operation conditions, and the installation personnel shall rigorously install the corresponding flange joints in accordance with the provisions of the installation procedure document. 6.1.3 When the assembled flange has deviations exceeding the limits, forceful assembly is not allowed. 6.1.4 The bolt tightening tools used for installation shall be regularly verified or calibrated, and used within the validity period. 6.1.5 The calibration of bolt installation load and bolt elongation shall comply with the following provisions. 6.1.6 The exposed bolt thread parts on the flange joint shall be protected with a suitable lubricant to facilitate the subsequent removal of the flange joint. 6.1.7 After installation is completed, installation records, inspection and maintenance records shall be kept in a timely manner. 6.2 Installation Preparation 6.2.1 Cleanup 6.2.1.1 Use tools or suitable solvents to clean various marks, paint, grease, protective coatings, dirt, etc. remaining on the flange sealing surface to prevent soils from damaging the surface roughness of the flange sealing surface. Do not use carbon steel brushes to clean stainless steel flange sealing surfaces. 6.2.2.4 The contact surface between the flange and the nut or gasket shall be flat, and without visible uneven wear, severe dents and scratches, etc.7 Inspections, Tests and Markings7.1 Inspection of Flange Joint after Installation After the flange joint is installed, the following inspections shall be performed. 7.2 Pressure Test and Sensitivity Leakage Test of Flange Joints 7.2.1 After installation, each flange joint shall be checked for leakage during the pressure test of the pressure equipment. 7.2.2 When required by the user or designer, sensitivity leakage test shall be carried out. The test methods and requirements shall comply with the provisions of GB/T 20801.5.8 Records8.1 The installation operator shall complete the flange joint installation record, which shall at least include the flange joint number or installation location, component type and specification, inspection items, alignment deviation, lubricant condition, tools used and quantity, bolt installation load, 8.2 Installation records shall not replace the written installation procedure document. The retention period for the installation records shall be implemented in accordance with relevant national regulations. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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