GB/T 20663-2026 Accumulators English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 13.220.10
CCS H 57
National Standard of the People's Republic of China
GB/T 20663-2026
Replaces GB/T 20663-2017
Accumulators
蓄能压力容器
Issue date: 2026-01-28 Implementation date: 2027-02-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms, Definitions, and Symbols
4 General Principles
5 Materials
6 Design
7 Manufacture
8 Technical Requirements and Test Methods
9 Inspection Rules
10 Marking and Transport Packaging
11 Accompanying Documents
Annex A (Informative) Typical Structure and Marking Method for Bladder Accumulators
Annex B (Informative) Typical Structure and Marking Method for Threaded Connection Diaphragm Accumulators
Annex C (Normative) Typical Structure and Marking Method for Welded Diaphragm Accumulators
Annex D (Informative) Typical Structure and Marking Method for Piston Accumulators
Annex E (Normative) Technical Specifications for Bladders and Diaphragms
Annex F (Normative) General Requirements for Fatigue Testing of Accumulators
Annex G (Normative) Design Fatigue Curves
Annex H (Informative) Test Device for Measuring Discharge Flow of Accumulators
Annex I (Normative) Safe Use of Accumulators
Accumulator Pressure Vessels
1 Scope
This document specifies the requirements for materials, design, manufacture, technical performance and test methods, inspection rules, marking, packaging, and transport of accumulator pressure vessels (hereinafter referred to as "accumulators," unless specifically referring to a particular type).
This document applies to the design, manufacture, and inspection of accumulators.
This document does not apply to the design, manufacture, and inspection of accumulators made of non-metallic materials.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
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: Fabrication, Inspection and Testing, and Acceptance
GB/T 196 General Purpose Screw Threads — Basic Dimensions
GB/T 197 General Purpose Screw Threads — Tolerances
GB/T 223 (all parts) Methods for Chemical Analysis of Iron, Steel and Alloy
GB/T 228.1 Metallic Materials — Tensile Testing — Part 1: Method of Test at Room Temperature
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 232 Metallic Materials — Bend Test Method
GB/T 246 Metallic Materials — Tube — Flattening Test Method
GB/T 528 Rubber, Vulcanized or Thermoplastic — Determination of Tensile Stress-Strain Properties
GB/T 529 Rubber, Vulcanized or Thermoplastic — Determination of Tear Strength (Trouser, Angle and Crescent Test Pieces)
GB/T 531.1 Rubber, Vulcanized or Thermoplastic — Determination of Indentation Hardness — Part 1: Durometer Method (Shore Hardness)
GB/T 699 Quality Carbon Structural Steels
GB/T 1220 Stainless Steel Bars
GB/T 1682 Rubber, Vulcanized — Determination of Low-Temperature Brittleness — Single Specimen Method
GB/T 1688 Rubber, Vulcanized — Determination of Tension Fatigue
GB/T 1690 Rubber, Vulcanized or Thermoplastic — Test Method for Effect of Liquids
GB/T 3077 Alloy Structure Steels
GB/T 3512 Rubber, Vulcanized or Thermoplastic — Accelerated Ageing and Heat Resistance Tests — Air Oven Method
GB/T 4732.2 Pressure Vessels — Design by Analysis — Part 2: Materials
GB/T 4732.3 Pressure Vessels — Design by Analysis — Part 3: Formula Method
GB/T 4732.4 Pressure Vessels — Design by Analysis — Part 4: Stress Classification Method
GB/T 4732.5 Pressure Vessels — Design by Analysis — Part 5: Elastic-Plastic Analysis Method
GB/T 4732.6 Pressure Vessels — Design by Analysis — Part 6: Fabrication, Inspection and Testing, and Acceptance
GB/T 5721 General Rules for Marking, Packaging, Transportation and Storage of Rubber Sealing Products
GB/T 5777 Automated Full Peripheral Ultrasonic Testing of Seamless and Welded (Except Submerged Arc-Welded) Steel Tubes for Longitudinal and/or Transverse Imperfections
GB/T 6031 Rubber, Vulcanized or Thermoplastic — Determination of Hardness (Hardness between 10 IRHD and 100 IRHD)
GB/T 6394 Determination of Estimating the Average Grain Size of Metal
GB/T 8923.1 Preparation of Steel Substrates Before Application of Paints and Related Products — Visual Assessment of Surface Cleanliness — Part 1: Rust Grades and Preparation Grades of Uncoated Steel Substrates and of Steel Substrates After Overall Removal of Previous Coatings
GB/T 9251 Test Method for Hydraulic Test of Gas Cylinders
GB/T 9252 Test Method for Pressure Cycling Test of Gas Cylinders
GB/T 9948 Seamless Steel Tubes for Petrochemical and Chemical Plant Service
GB/T 11170 Stainless Steel — Determination of Multi-Element Contents — Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 11211 Rubber, Vulcanized or Thermoplastic — Determination of Adhesion to Metal — Two-Plate Method
GB/T 13296 Seamless Stainless Steel Tubes for Boiler and Heat Exchanger
GB/T 13305 Determination of Area Content of α-Phase in Stainless Steels
GB/T 13934 Rubber, Vulcanized or Thermoplastic — Determination of Flex Cracking and Crack Growth (De Mattia Type)
GB/T 14976 Seamless Stainless Steel Tubes for Fluid Transport
GB/T 15385 Test Method for Hydraulic Burst Test of Gas Cylinders
GB/T 18248 Seamless Steel Tubes for Gas Cylinder
GB/T 21833.1 Austenitic-Ferritic (Duplex) Stainless Steel Seamless Tubes — Part 1: Tubes for Heat Exchanger
GB/T 21833.2 Austenitic-Ferritic (Duplex) Stainless Steel Seamless Tubes — Part 2: Tubes for Fluid Transport
GB/T 22085.1 Electron and Laser Beam Welded Joints — Guidance for Quality Levels for Imperfections — Part 1: Steel
GB/T 26929 Terminology for Pressure Vessels
JB/T 7858 Cleanliness Assessment Method for Hydraulic Components and Cleanliness Specifications for Hydraulic Components
NB/T 10558 Coating and Transport Packaging for Pressure Vessels
NB/T 47008 Carbon Steel and Alloy Steel Forgings for Pressure Equipment
NB/T 47009 Alloy Steel Forgings for Low-Temperature Pressure Equipment
NB/T 47010 Stainless Steel and Heat-Resistant Steel Forgings for Pressure Equipment
NB/T 47013.2 Nondestructive Testing of Pressure Equipment — Part 2: Radiographic Testing
NB/T 47013.3 Nondestructive Testing of Pressure Equipment — Part 3: Ultrasonic Testing
NB/T 47013.4 Nondestructive Testing of Pressure Equipment — Part 4: Magnetic Particle Testing
NB/T 47013.5 Nondestructive Testing of Pressure Equipment — Part 5: Penetrant Testing
NB/T 47013.7 Nondestructive Testing of Pressure Equipment — Part 7: Visual Testing
NB/T 47013.15 Nondestructive Testing of Pressure Equipment — Part 15: Phased Array Ultrasonic Testing
NB/T 47014 Welding Procedure Qualification for Pressure Equipment
TSG 21 Supervision Regulation on Safety Technology for Stationary Pressure Vessel
3 Terms, Definitions, and Symbols
3.1 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 26929 and the following apply.
3.1.1
accumulators
Hydraulic accumulator pressure vessels that separate liquid and gas through internal isolating components (bladder, diaphragm, piston, etc.), utilizing the compressibility of gas, where the gas pressure in the gas chamber applies pressure to the liquid in the liquid port.
3.1.2
bladder accumulators
Accumulators consisting of a shell and a bladder, where the liquid and gas are separated by the flexible rubber bladder.
NOTE: The shell is an integral component consisting of a seamless tube and approximately hemispherical heads formed by hot forming (spinning, forging) at both ends.
3.1.3
diaphragm accumulators
Accumulators consisting of an upper shell (end cap), a lower shell, and a diaphragm, where the liquid and gas are separated by the flexible rubber diaphragm.
NOTE: The connection methods for the upper shell (end cap) and lower shell include: welding, self-threading, or connection via an external ring nut.
3.1.4
piston accumulators
Accumulators consisting of a cylindrical barrel, a piston, and end caps, where the liquid and gas are separated by the piston seal assembly.
3.1.5
operating pressure
The maximum pressure that may be reached in the accumulator under normal operating conditions.
3.1.6
charging gas pressure
The gas pressure in the accumulator when there is no pressure on the liquid side.
3.1.7
nominal capacity
The volume of the gas chamber of the accumulator in the charged state.
3.1.8
design pressure
The specified maximum pressure of the accumulator.
GB/T 20663-2026 Accumulators English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 13.220.10
CCS H 57
National Standard of the People's Republic of China
GB/T 20663-2026
Replaces GB/T 20663-2017
Accumulators
蓄能压力容器
Issue date: 2026-01-28 Implementation date: 2027-02-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms, Definitions, and Symbols
4 General Principles
5 Materials
6 Design
7 Manufacture
8 Technical Requirements and Test Methods
9 Inspection Rules
10 Marking and Transport Packaging
11 Accompanying Documents
Annex A (Informative) Typical Structure and Marking Method for Bladder Accumulators
Annex B (Informative) Typical Structure and Marking Method for Threaded Connection Diaphragm Accumulators
Annex C (Normative) Typical Structure and Marking Method for Welded Diaphragm Accumulators
Annex D (Informative) Typical Structure and Marking Method for Piston Accumulators
Annex E (Normative) Technical Specifications for Bladders and Diaphragms
Annex F (Normative) General Requirements for Fatigue Testing of Accumulators
Annex G (Normative) Design Fatigue Curves
Annex H (Informative) Test Device for Measuring Discharge Flow of Accumulators
Annex I (Normative) Safe Use of Accumulators
Accumulator Pressure Vessels
1 Scope
This document specifies the requirements for materials, design, manufacture, technical performance and test methods, inspection rules, marking, packaging, and transport of accumulator pressure vessels (hereinafter referred to as "accumulators," unless specifically referring to a particular type).
This document applies to the design, manufacture, and inspection of accumulators.
This document does not apply to the design, manufacture, and inspection of accumulators made of non-metallic materials.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
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: Fabrication, Inspection and Testing, and Acceptance
GB/T 196 General Purpose Screw Threads — Basic Dimensions
GB/T 197 General Purpose Screw Threads — Tolerances
GB/T 223 (all parts) Methods for Chemical Analysis of Iron, Steel and Alloy
GB/T 228.1 Metallic Materials — Tensile Testing — Part 1: Method of Test at Room Temperature
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 232 Metallic Materials — Bend Test Method
GB/T 246 Metallic Materials — Tube — Flattening Test Method
GB/T 528 Rubber, Vulcanized or Thermoplastic — Determination of Tensile Stress-Strain Properties
GB/T 529 Rubber, Vulcanized or Thermoplastic — Determination of Tear Strength (Trouser, Angle and Crescent Test Pieces)
GB/T 531.1 Rubber, Vulcanized or Thermoplastic — Determination of Indentation Hardness — Part 1: Durometer Method (Shore Hardness)
GB/T 699 Quality Carbon Structural Steels
GB/T 1220 Stainless Steel Bars
GB/T 1682 Rubber, Vulcanized — Determination of Low-Temperature Brittleness — Single Specimen Method
GB/T 1688 Rubber, Vulcanized — Determination of Tension Fatigue
GB/T 1690 Rubber, Vulcanized or Thermoplastic — Test Method for Effect of Liquids
GB/T 3077 Alloy Structure Steels
GB/T 3512 Rubber, Vulcanized or Thermoplastic — Accelerated Ageing and Heat Resistance Tests — Air Oven Method
GB/T 4732.2 Pressure Vessels — Design by Analysis — Part 2: Materials
GB/T 4732.3 Pressure Vessels — Design by Analysis — Part 3: Formula Method
GB/T 4732.4 Pressure Vessels — Design by Analysis — Part 4: Stress Classification Method
GB/T 4732.5 Pressure Vessels — Design by Analysis — Part 5: Elastic-Plastic Analysis Method
GB/T 4732.6 Pressure Vessels — Design by Analysis — Part 6: Fabrication, Inspection and Testing, and Acceptance
GB/T 5721 General Rules for Marking, Packaging, Transportation and Storage of Rubber Sealing Products
GB/T 5777 Automated Full Peripheral Ultrasonic Testing of Seamless and Welded (Except Submerged Arc-Welded) Steel Tubes for Longitudinal and/or Transverse Imperfections
GB/T 6031 Rubber, Vulcanized or Thermoplastic — Determination of Hardness (Hardness between 10 IRHD and 100 IRHD)
GB/T 6394 Determination of Estimating the Average Grain Size of Metal
GB/T 8923.1 Preparation of Steel Substrates Before Application of Paints and Related Products — Visual Assessment of Surface Cleanliness — Part 1: Rust Grades and Preparation Grades of Uncoated Steel Substrates and of Steel Substrates After Overall Removal of Previous Coatings
GB/T 9251 Test Method for Hydraulic Test of Gas Cylinders
GB/T 9252 Test Method for Pressure Cycling Test of Gas Cylinders
GB/T 9948 Seamless Steel Tubes for Petrochemical and Chemical Plant Service
GB/T 11170 Stainless Steel — Determination of Multi-Element Contents — Spark Discharge Atomic Emission Spectrometric Method (Routine Method)
GB/T 11211 Rubber, Vulcanized or Thermoplastic — Determination of Adhesion to Metal — Two-Plate Method
GB/T 13296 Seamless Stainless Steel Tubes for Boiler and Heat Exchanger
GB/T 13305 Determination of Area Content of α-Phase in Stainless Steels
GB/T 13934 Rubber, Vulcanized or Thermoplastic — Determination of Flex Cracking and Crack Growth (De Mattia Type)
GB/T 14976 Seamless Stainless Steel Tubes for Fluid Transport
GB/T 15385 Test Method for Hydraulic Burst Test of Gas Cylinders
GB/T 18248 Seamless Steel Tubes for Gas Cylinder
GB/T 21833.1 Austenitic-Ferritic (Duplex) Stainless Steel Seamless Tubes — Part 1: Tubes for Heat Exchanger
GB/T 21833.2 Austenitic-Ferritic (Duplex) Stainless Steel Seamless Tubes — Part 2: Tubes for Fluid Transport
GB/T 22085.1 Electron and Laser Beam Welded Joints — Guidance for Quality Levels for Imperfections — Part 1: Steel
GB/T 26929 Terminology for Pressure Vessels
JB/T 7858 Cleanliness Assessment Method for Hydraulic Components and Cleanliness Specifications for Hydraulic Components
NB/T 10558 Coating and Transport Packaging for Pressure Vessels
NB/T 47008 Carbon Steel and Alloy Steel Forgings for Pressure Equipment
NB/T 47009 Alloy Steel Forgings for Low-Temperature Pressure Equipment
NB/T 47010 Stainless Steel and Heat-Resistant Steel Forgings for Pressure Equipment
NB/T 47013.2 Nondestructive Testing of Pressure Equipment — Part 2: Radiographic Testing
NB/T 47013.3 Nondestructive Testing of Pressure Equipment — Part 3: Ultrasonic Testing
NB/T 47013.4 Nondestructive Testing of Pressure Equipment — Part 4: Magnetic Particle Testing
NB/T 47013.5 Nondestructive Testing of Pressure Equipment — Part 5: Penetrant Testing
NB/T 47013.7 Nondestructive Testing of Pressure Equipment — Part 7: Visual Testing
NB/T 47013.15 Nondestructive Testing of Pressure Equipment — Part 15: Phased Array Ultrasonic Testing
NB/T 47014 Welding Procedure Qualification for Pressure Equipment
TSG 21 Supervision Regulation on Safety Technology for Stationary Pressure Vessel
3 Terms, Definitions, and Symbols
3.1 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 26929 and the following apply.
3.1.1
accumulators
Hydraulic accumulator pressure vessels that separate liquid and gas through internal isolating components (bladder, diaphragm, piston, etc.), utilizing the compressibility of gas, where the gas pressure in the gas chamber applies pressure to the liquid in the liquid port.
3.1.2
bladder accumulators
Accumulators consisting of a shell and a bladder, where the liquid and gas are separated by the flexible rubber bladder.
NOTE: The shell is an integral component consisting of a seamless tube and approximately hemispherical heads formed by hot forming (spinning, forging) at both ends.
3.1.3
diaphragm accumulators
Accumulators consisting of an upper shell (end cap), a lower shell, and a diaphragm, where the liquid and gas are separated by the flexible rubber diaphragm.
NOTE: The connection methods for the upper shell (end cap) and lower shell include: welding, self-threading, or connection via an external ring nut.
3.1.4
piston accumulators
Accumulators consisting of a cylindrical barrel, a piston, and end caps, where the liquid and gas are separated by the piston seal assembly.
3.1.5
operating pressure
The maximum pressure that may be reached in the accumulator under normal operating conditions.
3.1.6
charging gas pressure
The gas pressure in the accumulator when there is no pressure on the liquid side.
3.1.7
nominal capacity
The volume of the gas chamber of the accumulator in the charged state.
3.1.8
design pressure
The specified maximum pressure of the accumulator.
