GB/T 20801.6-2020 PDF EnglishUS$485.00 · In stock · Download in 9 seconds
GB/T 20801.6-2020: Pressure piping code - Industrial piping - Part 6: Safeguarding 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 20801.6: Historical versions
Similar standardsGB/T 20801.6-2020: Pressure piping code - Industrial piping - Part 6: Safeguarding---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/GBT20801.6-2020GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.040 J 74 Replacing GB/T 20801.6-2006 Pressure piping code - Industrial piping - Part 6. Safeguarding Issued on. NOVEMBER 19, 2020 Implemented on. JUNE 01, 2021 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Safety relief device... 11 5 Flame arrester... 19 6 Other safety protection devices... 20 7 Safety protection... 21 Appendix A (Informative) Safety protection layer analysis... 25 Appendix B (Informative) Calculation of safety relief device... 27 Appendix C (Informative) Selection of safety relief device... 39 Appendix D (Informative) Types and selection of flame arresters... 42 Appendix E (Informative) MESG and explosion group of combustible gas and vapour... 46 References... 491 ScopeThis Part of GB/T 20801 specifies the basic requirements for safety protection devices, such as safety relief devices, flame arresters, fire emergency block valves and mechanical interlocking devices, of the pressure piping system, and safety protection. For other safety protection requirements, which are not specified in this Part, refer to other parts of GB/T 20801 and the provisions of relevant national regulations, standards and specifications. This Part applies to the safety protection of pressure piping systems that are defined by the scope of GB/T 20801.1.2 Normative referencesThe 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 12158, General guideline for preventing electrostatic accidents GB/T 12242, Performance test code - Pressure relief devices GB/T 15605, Guide for pressure venting of dust explosions GB/T 15706, Safety of machinery - General principles for design - Risk assessment and risk reduction GB/T 20801.1-2020, Pressure piping code - Industrial piping - Part 1. General GB/T 20801.2-2020, Pressure piping code - Industrial piping - Part 2. Materials GB/T 20801.3-2020, Pressure piping code - Industrial piping - Part 3.Design and calculation GB/T 20801.4-2020, Pressure piping code - Industrial piping - Part 4. Fabrication and assembly GB/T 20801.5-2020, Pressure piping code - Industrial piping - Part 5. Inspection and testing3 Terms and definitionsTerms and definitions determined by GB/T 20801.1-2020, GB/T 20801.2-2020, GB/T 20801.3-2020, GB/T 20801.4-2020, GB/T 20801.5-2020, and the following ones are applicable to this document. 3.1 Safety protection device The mechanical (physical) protection devices that function in the event of failure of automatic control instruments and manual intervention according to the analysis of the safety protection layer (see Appendix A). 3.2 Safety relief device The device that is started by the static pressure of the inlet or the static pressure difference between the inlet and outlet to release the fluid to prevent the pressure in the system from exceeding the predetermined safe value in the case of non-fire or fire accidents. 3.3 Safety valve The valve that is controlled by spring action or pilot valves. When the static pressure at the inlet (static pressure difference between the inlet and outlet for ordinary valves) exceeds the set pressure, the valve opens to release the fluid to prevent the pressure in the system from exceeding the predetermined safe value. When the pressure drops to the re-seating pressure, the valve can be4 Safety relief device4.1 General provisions 4.1.1 The safety relief device shall prevent overpressure accidents in any part of the independent pressure system. Designers should use various process hazard assessment (PHA) methods to study all possible overpressure conditions in the specific process. When identifying various overpressure conditions, the following guidelines shall be followed. 4.1.2 Automatic control instruments and alarm interlocking devices shall not replace safety relief devices as the system's overpressure protection facilities. When emissions are not allowed or safety relief devices cannot be installed, all overpressure conditions can be evaluated and analyzed through process hazard sources, and a system design method, i.e., intrinsic safety design or high integrity protection system (HIPS), can be used to eliminate the cause of system overpressure or perform system overpressure protection. 4.1.3 Equipment or piping systems that meet the following conditions shall be equipped with safety relief devices. 4.1.4 The independent pressure system shall be equipped with one or more parallel safety relief devices at appropriate locations. 4.1.5 The determination of relevant pressures of the safety relief device shall meet the following requirements. 4.2 Determination of required relief capacity and minimum relief area. 4.2.1 Under typical overpressure conditions, the required relief capacity shall be determined according to the criteria in Table 2. 4.3 Setting of inlet and outlet valves and piping of safety relief devices 4.3.1 Block valves should not be installed at the inlet and outlet of the safety relief device. When it is necessary to install due to the inspection and maintenance of the safety relief device, the following requirements shall be met. 4.3.2 The inlet piping of the safety relief device shall meet the following requirements. 4.3.3 The outlet piping of the safety relief device shall meet the following requirements. 4.4 Selection of safety relief device 4.4.1 For the safety relief device, the relief medium, the process overpressure conditions and the performance of the safety relief device shall be considered when selecting the appropriate form of the safety relief device. See Appendix C. The selection of the safety relief device shall comply with the relevant standards. 4.4.2 Safety relief device products shall comply with the relevant standards such as TSG ZF001, TSG ZF003 and GB/T 12242.5 Flame arrester5.1 Application of flame arrester 5.1.1 Flame arrestor products and applications shall comply with relevant standards such as ISO 16852 and PD CEN/TR 16793. 5.1.2 In the process equipment, there are a large number of non-electrical equipment and piping systems in potentially explosive environments. Flame arrestor is the main safety protection device for explosion-proof of non-electrical equipment. It has the function of preventing explosion, preventing explosion from spreading through piping, and preventing deflagration from developing into detonation. Refer to Appendix D for the types and selection of flame arresters. 5.2 Flame arrestor settings The following equipment and piping systems shall be equipped with flame arresters. 5.3 MESG and explosion group of combustible gas and vapour According to MESG, combustible gas and vapour are divided into 7 explosion groups, as shown in Table 3.The gap of the flame arrestor shall be smaller than the MESG of combustible gas and vapour.6 Other safety protection devices6.1 Fire emergency block valve 6.1.1 Fire emergency block valves should be installed at the exit end of key storage tanks such as large-scale, liquefied gas and acute toxicity category 1 and category 2 chemicals. 6.2 Mechanical interlocking device 6.2.1 Mechanical interlocking is a high-integrity safety protection device that prevents major accidents caused by human error. Products shall comply with relevant standards such as GB/T 15706. 6.2.2 When operational errors in operation and maintenance may cause major accidents, mechanical interlocking devices should be installed.7 Safety protection7.1 General provisions When taking safety protection measures, the following factors shall be considered. 7.2 Safety protection in factory layout 7.2.1 The layout of equipment in the open air shall meet the following requirements. 7.2.2 Flammable and toxic fluids shall be discharged into a closed system, and shall not be directly discharged into sewers and the atmosphere. 7.2.3 Combustible gas whose density is greater than that of ambient air shall be discharged into the flare system; combustible gas whose density is lower than that of ambient air can be discharged into the atmosphere if a torch is not allowed to be set up and it meets sanitary standards. 7.2.4 The vent pipe opening of the combustible gas piping and the discharge position of the safety relief device shall meet the requirements of GB 50160, GB 50984 and GB 31571. 7.2.5 The clearance height of overhead piping through roads, railways, sidewalks, etc., and the horizontal distance from the edge of the piping frame of the outer piping gallery to the building or other facilities shall meet the requirements of GB 50160, GB 50016 and GB 50984.The clear crossing distance between piping and high-voltage power lines shall comply with the relevant standards for overhead lines. 7.2.6 The piping located above the passages, roads and railways shall not be installed with valves, flanges, threaded joints and compensators with fillers and other piping components that may leak. 7.2.7 No GC1 piping shall be arranged in the passable pipe trench. 7.3 Safety protection in production management 7.4 Safety protection facilities and measures 7.4.1 The fire-fighting system and sprinkler facilities shall include fire-proof structures such as fire walls and explosion-proof walls of buildings, ventilation devices, telemetry and remote-control devices that are removed with toxic, corrosive or flammable vapors, and storage or recovery devices, facilities for emergency treatment of hazardous materials, such as torches or incinerators. 7.4.2 Protective covers shall be provided at the brittle material piping system or flanges, joints, valve covers, instruments or sight glasses, so as to limit and reduce the hazard degree of leakage. 7.4.3 When the "water hammer" phenomenon may occur in piping filled with liquid, or "steam hammer" may occur in piping with compressible fluid, appropriate protective measures should be taken based on the analysis results of fluid mechanics. 7.4.7 Necessary protective masks, gas masks, emergency breathing systems, special medicines, portable combustible and toxic gas detection and alarm systems and other sanitary safety equipment shall be installed. Emergency showers and eyewash shall be installed near discharge points or leaks that may cause accidental human injury. 7.4.8 For radiant fluid piping, shielding protection and automatic alarm systems shall be provided, and special masks, gloves and protective clothing shall be equipped. 7.4.9 Electrostatic grounding measures shall be taken for all piping systems that may generate static electricity hazards in explosion and fire hazardous locations. For example, it can be grounded through the grounding grid of equipment, piping and civil structures, and flange jumper. Other anti-static requirements shall meet the requirements of GB 12158. 7.4.10 The blind plate setting shall meet the following requirements. 7.4.11 When vapour, air, nitrogen and other public engineering piping are connected with GC1 and GC2 piping, the following requirements shall be met. ......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 20801.6-2020 be delivered?Answer: The full copy PDF of English version of GB/T 20801.6-2020 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 20801.6-2020_English with my colleagues?Answer: Yes. 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