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GB/T 20663-2026: Accumulators
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 20663-2026	English	1199	Add to Cart	7 days [Need to translate]	Accumulators
GB/T 20663-2017	English	999	Add to Cart	7 days [Need to translate]	Accumulators
GB/T 20663-2006	English	RFQ	ASK	5 days [Need to translate]	Bladder type accumulators [including MODIFICATION 1]

GB/T 20663-2026: Accumulators

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ICS 23.020.30 CCSJ74 National Standards of the People's Republic of China Replaces GB/T 20663-2017 Energy storage pressure vessel Published on 2026-01-28 Implemented on August 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III 1.Scope 1 2 Normative References 1 3.Terms, Definitions, and Symbols 2 4 General Principles 6 5 Materials 7 6 Design 12 7 Manufacturing 21 8 Technical Requirements and Test Methods 24 9.Inspection Rule 31 10 Markings and Transport Packaging 32 11 Accompanying Documents 33 Appendix A (Informative) Typical Structural Types and Marking Methods of Bladder Accumulators 34 Appendix B (Informative) Typical Structural Types and Marking Methods of Threaded Diaphragm Accumulators 37 Appendix C (Normative) Typical Structural Types and Marking Methods of Welded Diaphragm Accumulators 39 Appendix D (Informative) Typical Structural Types and Marking Methods of Piston Accumulators 41 Appendix E (Normative) Technical Requirements for Capsules and Diaphragms 42 Appendix F (Normative) General Requirements for Fatigue Testing of Accumulators 49 Appendix G (Normative) Design Fatigue Curve 51 Appendix H (Informative) Accumulator Discharge Flow Rate Test Apparatus 54 Appendix I (Normative) Safe Use of Energy Accumulators 55

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document replaces GB/T 20663-2017 "Energy Storage Pressure Vessels". Compared with GB/T 20663-2017, the only changes are structural adjustments and editing. Aside from the sexual alterations, the main technical changes are as follows. a) The general parameters for the accumulator have been changed (see Table 1,.2017 version 1.4); b) The definition of the energy storage device has been expanded (see 4.1); c) All steel pipe standards have been updated, and duplex stainless steel pipe has been added as a shell material (see 5.2, Table 3,.2017 edition). 5.2 (Table 2) d) Added general design requirements (see 6.1); e) Added fatigue assessment (see 6.12); f) The performance and testing requirements for the shell after heat treatment have been changed (see 8.1.1, 5.2.4 of the.2017 version); g) Increased requirements for the metallographic structure of duplex stainless steel during manufacturing (see 8.4); h) Added non-destructive testing requirements for stainless steel casings during manufacturing (see 8.7.3); i) The content of functional verification testing has been added (see 8.19); j) Improved physical properties of the one-piece injection molded capsule (see Appendix E). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Boilers and Pressure Vessels (SAC/TC262). This document was drafted by. Lanzhou Petrochemical Equipment Testing Institute Co., Ltd. (Mechanical Industry), Gansu Lanke Petrochemical High-tech Equipment Co., Ltd. Company, Zhejiang University of Technology, Chengdu Tianren Pressure Vessel Co., Ltd., Ningbo Special Equipment Inspection and Research Institute, Chengdu Great High Pressure Vessel Co., Ltd. Limited Liability Company, Barclays (Tianjin) Hydraulic Equipment Co., Ltd., China Petrochemical Engineering & Construction Co., Ltd., China Special Equipment Safety and Energy Conservation Association, China Special Equipment Inspection and Research Institute, Shanghai Lanya Petrochemical Equipment Testing Institute Co., Ltd. of Machinery Industry, Ningbo Asahi Hydraulic Co., Ltd. Company, Shanghai Special Equipment Supervision and Inspection Technology Research Institute Co., Ltd., Bucma Accumulator (Tianjin) Co., Ltd., Jiabang Hydraulic Machinery Manufacturing Co., Ltd. (Shanghai) Co., Ltd., Shanghai Lanbin Petrochemical Equipment Co., Ltd., Hainan Provincial Institute of Inspection and Testing, Ningbo Fenghua Sainuo Hydraulic Technology Co., Ltd. Hydac Hydraulics Technology (Shanghai) Co., Ltd., Shanghai Blue Ocean Science and Technology Innovation Testing Co., Ltd., Dalian Boiler and Pressure Vessel Inspection and Testing Center Measurement and Testing Research Institute Co., Ltd. The main drafters of this document are. Dang Zhanwei, Su Houde, Chen Bingbing, Qin Cheng, Niu Yaping, Wang Chuanzhou, Ren Yong, Yuan Shaoyun, Wang Weiguo, and Zhang Shangwen. Chen Zhiwei, Shi Jiqing, Mao Weiwei, Xue Xiaolong, Liu Zhijun, Li Xiaopeng, Jia Xiaoliang, Zhou Wenxue, Qin Cheng, Ding Zhihe, Guo Xinpu, Chen Zhanyang Tao Siwei, Fan Pengjun, and Ma Lidong. This document was first published in.2006, revised for the first time in.2017, and this is the second revision. Energy storage pressure vessel

1 Scope

This document specifies the materials, design, and specifications for energy storage pressure vessels (hereinafter referred to as "energy storage vessels" unless otherwise specified). Manufacturing, technical performance and testing methods, inspection rules, marking, packaging and transportation requirements. This document applies to the design, manufacture, and inspection of energy storage devices. This document does not apply to the design, manufacture, and inspection of energy storage devices made of non-metallic materials.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 150.2 Pressure Vessels - Part 2.Materials GB/T 150.3 Pressure Vessels - Part 3.Design GB/T 150.4 Pressure Vessels - Part 4.Manufacturing, Inspection and Acceptance GB/T 196 Basic Dimensions of Ordinary Threads GB/T 197 Tolerances for Standard Threads GB/T 223 (all parts) Chemical Analysis Methods for Iron and Steel and Alloys GB/T 228.1 Metallic materials – Tensile testing – Part 1.Test method at room temperature GB/T 229 Metallic materials Charpy impact test method GB/T 231.1 Metallic materials – Brinell hardness test – Part 1.Test method GB/T 232 Metallic Materials - Bending Test Method GB/T 246 Test method for flattening of metallic tubes GB/T 528 Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber GB/T 529 Determination of tear strength of vulcanized rubber or thermoplastic rubber (trouser-shaped, right-angled and crescent-shaped specimens) GB/T 531.1 Test methods for indentation hardness of vulcanized rubber or thermoplastic rubber—Part 1.Shore hardness tester method (Shore hardness) GB/T 699 High-quality carbon structural steel GB/T 1220 Stainless Steel Bars GB/T 1682 Determination of Low-Temperature Brittleness of Vulcanized Rubber - Single Sample Method GB/T 1688 Determination of tensile fatigue in vulcanized rubber GB/T 1690 Test methods for resistance to liquids in vulcanized or thermoplastic rubbers GB/T 3077 Alloy Structural Steel GB/T 3512 Accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber in hot air GB/T 4732.2 Analysis and Design of Pressure Vessels - Part 2.Materials GB/T 4732.3 Analysis and design of pressure vessels - Part 3.Formula method GB/T 4732.4 Analysis and design of pressure vessels - Part 4.Stress classification method GB/T 4732.5 Analysis and design of pressure vessels - Part 5.Elastic-plastic analysis method GB/T 4732.6 Analysis and design of pressure vessels - Part 6.Manufacturing, inspection and acceptance ...