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GB/T 20663-2017: Accumulators
Status: Valid GB/T 20663: Evolution and historical versions
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Basic data | Standard ID | GB/T 20663-2017 (GB/T20663-2017) | | Description (Translated English) | Accumulators | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J74 | | Classification of International Standard | 23.020.30 | | Word Count Estimation | 50,544 | | Date of Issue | 2017-10-14 | | Date of Implementation | 2018-04-01 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 20663-2017: Accumulators---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Accumulators
ICS 23.020.30
J74
National Standards of People's Republic of China
Replacing GB/T 20663-2006
energy storage pressure vessel
Released on.2017-10-14
2018-04-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Issued by the Standardization Administration of China
table of contents
Preface I
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Structural types, representation methods and classification 3
5 material 4
6 design 7
7 Made 18
8 Performance and testing 20
9 Inspection rules 23
10 Marking, packaging, transportation 24
11 random files 25
12 Safe use of accumulators 25
Appendix A (informative appendix) Structure type and marking method of bladder accumulator 28
Appendix B (informative appendix) Structure type and marking method of threaded diaphragm accumulator 30
Appendix C (Normative Appendix) Technical Conditions for Welded Diaphragm Accumulators 32
Appendix D (informative appendix) Structure type and marking method of piston accumulator 38
Appendix E (Informative Appendix) Capsule and Diaphragm Technical Conditions 39
Appendix F (Normative Appendix) Accumulator Fatigue Test Requirements 43
Appendix G (Normative Appendix) Design Fatigue Curve 45
Appendix H (informative appendix) Accumulator discharge flow test device 47
foreword
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 20663-2006 "Pressure Vessels for Bladder Energy Storage". Compared with GB/T 20663-2006, the main technical changes
Converted as follows.
--- Increased diaphragm accumulator, piston accumulator (see 1.2, 1.3, 5.4, 5.5, 6.2.5, 6.2.6, 6.9, 6.10, etc.);
--- Modified the general parameters of the accumulator (see 1.3, Table 1);
---The shell has been increased with materials such as 34CrMo4, 06Cr19Ni10, 022Cr17Ni12Mo2 (see 5.2.1, Table 2);
--- Modified the mechanical performance indicators of the material (see Table 2, Table 3);
--- Increase the allowable stress and lateral expansion index of the material (see Table 2, Table 3);
--- Modify the design safety factor (see 6.3);
--- Added thread design calculation (see 6.8, 6.9.4, 6.10.3);
--- Increase the calculation of bladder accumulator oil valve and support ring structure (see 6.11);
--- Added requirements for safe use of accumulators (see Chapter 12);
--- Added the structural type and marking method of the threaded diaphragm accumulator (see Appendix B);
--- Added the technical conditions for welded diaphragm accumulators (see Appendix C);
--- Added the structural type and marking method of the piston accumulator (see Appendix D);
--- Added technical conditions for capsules and diaphragms (see Appendix E);
--- Increased accumulator fatigue test requirements (see Appendix F);
--- Increased design fatigue curve (see Appendix G);
--- Increased accumulator discharge flow test device (see Appendix H).
This standard was proposed and managed by the National Standardization Technical Committee for Boilers and Pressure Vessels (SAC/TC262).
This standard is mainly drafted by. Shanghai Lanbin Petrochemical Equipment Co., Ltd., Shanghai Special Equipment Supervision and Inspection Technology Research Institute, National
National Petroleum Drilling and Refining Equipment Quality Supervision and Inspection Center, Zhejiang University of Technology, Chengdu Tianren Pressure Vessel Factory, Ningbo Special Equipment Inspection and Research Institute
Research Institute, Fenghua Asahi Hydraulic Co., Ltd., Tianjin Aoqi Accumulator Co., Ltd., Japan Accumulator Co., Ltd., China Special Equipment
Testing Research Institute, Dalian Boiler and Pressure Vessel Inspection Research Institute, Shanghai Lanhai Kechuang Testing Co., Ltd.
The main drafters of this standard. Shi Jiqing, Chen Bingbing, Huang Guangde, Niu Yaping, Xue Xiaolong, Chen Xiaoxiang, Liu Ruichuan, Li Xiaopeng, Xia Hai,
Chen Zhanyang, Zhou Wenxue, Wang Jibing, Song Wenming, Chen Zhiwei, Dai Xingtao.
The previous releases of the standards replaced by this standard are as follows.
---GB/T 20663-2006.
energy storage pressure vessel
1 Scope
1.1 This standard specifies the material, design,
Manufacturing, performance and testing, inspection rules, marking, packaging, transportation and safe use requirements.
1.2 The accumulator specified in this standard refers to the container that utilizes the compressibility of the gas to pressurize the liquid at the liquid end by the gas pressure in the air cavity.
Product types include.
--- Bladder accumulator;
--- Diaphragm accumulator;
---Piston accumulator.
1.3 The possible failure modes of accumulators specified in this standard are.
--- ductile failure;
--- Brittle fracture;
--- Fatigue damage;
---leakage.
1.4 This standard is applicable to accumulators within the parameter range in Table 1, where the working medium at the liquid end is petroleum-based hydraulic oil or emulsion, and the air cavity is filled with nitrogen.
1.5 This standard does not apply to accumulators made of non-metallic materials.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document
pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 150.1-2011 Pressure Vessels Part 1.General Requirements
GB/T 150.2-2011 Pressure Vessels Part 2.Materials
GB/T 150.3-2011 Pressure Vessels Part 3.Design
GB/T 150.4-2011 Pressure Vessels Part 4.Manufacturing, Inspection and Acceptance
GB/T 196 Basic dimensions of ordinary thread
GB/T 197 Common thread tolerances
GB/T 223 (all parts) Methods for chemical analysis of iron, steel and alloys
GB/T 228.1 Tensile tests on metallic materials - Part 1.Test methods at room temperature
GB/T 229 Charpy pendulum impact test method for metallic materials
GB/T 231.1 Brinell hardness test for metallic materials - Part 1.Test method
GB/T 232 Metal material bending test method
GB/T 246 Metal pipe flattening test method
GB/T 528 Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber
GB/T 531.1 Test method for indentation hardness of vulcanized rubber or thermoplastic rubber - Part 1.Shore durometer method (Shore hardness)
GB/T 699 High Quality Carbon Structural Steel
GB/T 1220 stainless steel rod
GB/T 1682 Determination of low temperature brittleness of vulcanized rubber single sample method
GB/T 1690 Test method for liquid resistance of vulcanized rubber or thermoplastic rubber
GB/T 3077 Alloy structural steel
GB/T 5777-2008 Ultrasonic testing methods for seamless steel tubes
GB/T 6479 Seamless Steel Tubes for High Pressure Fertilizer Equipment
GB/T 7755 Determination of air permeability of vulcanized rubber or thermoplastic rubber
GB/T 7759.1 Determination of compression set of vulcanized rubber or thermoplastic rubber - Part 1.At room temperature and high temperature
GB/T 9251-2011 Hydrostatic test method for gas cylinders
GB/T 9252 Gas cylinder fatigue test method
GB/T 11211 Determination of Adhesion Strength of Vulcanized Rubber or Thermoplastic Rubber to Metal Two-plate Method
GB/T 13296 Boiler and Heat Exchanger Stainless Steel Seamless Tubes
GB/T 13934 Determination of flex cracking and crack growth of vulcanized rubber or thermoplastic rubber (Demesia type)
GB/T 14976 Stainless Steel Seamless Steel Tubes for Fluid Transmission
GB/T 15385 Hydrostatic Burst Test Method for Gas Cylinders
GB/T 18248 Seamless Steel Tubes for Gas Cylinders
GB/T 22085.1 Guidelines for quality classification of defects in electron beam and laser welded joints - Part 1.Steel
JB/T 4711 Pressure vessel coating and transport packaging
JB4732-1995 Steel Pressure Vessel --- Analysis and Design Standard (confirmed in.2005)
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 47013.1 Non-destructive testing of pressure equipment Part 1.General requirements
NB/T 47013.4 Non-destructive testing of pressure equipment - Part 4.Magnetic particle testing
NB/T 47013.5 Non-destructive testing of pressure equipment - Part 5.Penetrant testing
NB/T 47013.7 Non-destructive testing of pressure equipment - Part 7.Visual testing
NB/T 47013.8 Non-destructive testing of pressure equipment - Part 8.Leakage testing
NB/T 47014 Welding procedure qualification for pressure equipment
TSG21 Safety Technical Supervision Regulations for Stationary Pressure Vessels
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
It is mainly composed of a shell and a capsule, and the liquid and gas are separated by a flexible capsule.
3.2
It consists of upper and lower shells connected by welding, self-thread or external ring lock nut, and the liquid and gas are separated by a flexible rubber diaphragm.
3.3
Composed of a cylindrical barrel, a piston and an end cap, liquid and gas are separated by a piston seal assembly.
3.4
operating pressure
Under normal operating conditions, the highest possible pressure of the accumulator.
3.5
Inflatable pressure charginggaspressure
The gas pressure in the accumulator when there is no pressure at the liquid end.
3.6
Nominal volume nominalcapacity
The volume of the air cavity of the accumulator in the inflated state.
3.7
Design pressure designpressure
The set maximum pressure of the accumulator, together with the corresponding design temperature, shall be used as the design load condition, and its value shall not be lower than the working pressure.
3.8
design temperature design temperature
Under normal working conditions of the accumulator, set the metal temperature of the element (the average temperature along the metal section of the element). design temperature and
The design pressure is taken together as the design loading condition.
3.9
Discharge volume dischargevolume
After pressurized accumulator, when its pressure changes between the highest operating pressure and the lowest operating pressure of the circuit, the volume of hydraulic oil in the accumulator
changing value.
3.10
Discharge flow dischargeflow
The discharge volume of hydraulic oil per unit time.
3.11
batch batch
Use the same type of container, the same design conditions, have the same nominal diameter, wall thickness, use the same furnace number material, the same manufacturing method, according to the same
A heat treatment specification defines the number of accumulator shells to be heat treated.
3.12
Styling productsstandardproducts
According to the provisions of this standard, material selection, design, manufacture and acceptance, if the type test is qualified, it can be mass-produced serialized products.
4 Structural type, representation method and classification
4.1 Structural type and representation method
4.1.1 The structural types of the bladder accumulator are divided into A type, AB type, and B type. For the structural type, component names and product representation methods, please refer to the appended
Record A.
4.1.2 The structural types of threaded diaphragm accumulators are divided into Type A, Type B and Type C, and their structures, parts names and product representation methods
See Appendix B; welded diaphragm accumulators are divided into Type A and Type B, and see Appendix C for their structure, component names and product representation.
4.1.3 The structural types of piston accumulators are divided into Type A and Type B. Please refer to Appendix D for their structure, component names and product representation methods.
4.2 Classification
4.2.1 The design pressure of the accumulator is divided into 10 grades (in MPa). 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63, 80.when set
When the gauge pressure is between two adjacent pressure levels, it shall be determined through negotiation between the supplier and the purchaser.
4.2.2 The nominal volume of the accumulator is divided into 24 grades (unit. L). 0.25, 0.40, 0.63, 1.0, 1.6, 2.5, 4.0, 6.3, 10, 16,
20, 25, 32, 40, 50, 63, 80, 100, 125, 160,.200, 250, 315, 350.When the required volume is between two adjacent volume levels,
It should be determined through consultation between the supplier and the buyer.
5 materials
5.1 General
5.1.1 The materials used for the main pressure components of the accumulator (shell, end cover, valve body, support ring, threaded diaphragm accumulator annular lock nut) shall comply with this specification.
stipulations, and should consider the service conditions of the accumulator (such as temperature, pressure, medium characteristics, etc.), manufacturing process and economic rationality.
5.1.2 The materials used for the main pressure components of the accumulator shall have a quality certificate; when the accumulator manufacturer obtains materials from the material manufacturer,
The original quality certificate provided by the material manufacturer shall be obtained; when the accumulator manufacturer obtains materials from a non-material manufacturer, it shall obtain the
The original quality certificate provided by the material manufacturer or a copy of the inspection official seal of the material supplier and the seal of the person in charge;
The responsible person shall be responsible for the authenticity and consistency of the obtained materials and quality certificates.
5.1.3 The use of foreign brands and new materials shall comply with the provisions of TSG21.
5.2 Housing
5.2.1 The casing of bladder accumulator and cylinder of piston accumulator shall generally be made of seamless steel pipe, and the inner diameter of the piston shall be less than or equal to 100mm.
The barrel of the type accumulator can also be manufactured by hot-rolled round steel or forging, and the axial length of the barrel should be approximately parallel to the metal deformation line of the blank.
Steel pipes, round steel or forgings that have not been subjected to ultrasonic testing one by one are used to process and manufacture cylinders, and the accumulator manufacturer shall conduct ultrasonic testing one by one.
The test method shall comply with the provisions of GB/T 5777-2008; the acceptance level of high-quality carbon steel pipes and cold-rolled (drawn) alloy steel pipes shall meet the requirements of L2
The acceptance level of hot-rolled alloy steel pipes, round steel or forgings machined and manufactured cylinders shall be determined through negotiation between the supplier and the purchaser. shell force
The mechanical properties and allowable stress are shown in Table 2 (the mechanical properties and allowable stress of the round steel or forging machined cylinder should meet the requirements of Table 3).
6.2.2 Main contents of the general design drawing
In addition to meeting the requirements of TSG21, the general design drawing shall also include the following contents.
a) design thickness and nominal thickness;
b) Pressure fluctuation range, that is, the difference between the maximum working pressure p2 of the hydraulic circuit and the minimum working pressure p1 of the hydraulic circuit;
c) Fatigue test regulations, for those that do not need to be performed, "not required" should be indicated.
6.2.3 Regulations on the same design drawing number
If the following conditions are met, the same design drawing number can be used for design.
a) The accumulators are of the same type;
b) the container class is the same;
c) The design parameters are the same and the types of materials are the same;
d) Only the length is different, and the length of the cylindrical part is not less than 2.0(Doδ)0.5, and the other dimensions and shapes are the same.
6.2.4 Bladder accumulator
6.2.4.1 For bladder accumulators that meet the following conditions at the same time, the fatigue test shall be carried out in accordance with the requirements of F.1 Class I fatigue test;
quotient, or according to F.2 Type II fatigue test requirements.
a) The design pressure is not greater than 35MPa;
b) The volume is not greater than 250L;
c) The outer diameter is not greater than 426mm;
d) During normal operation, the pressure fluctuation range is not greater than 0.5 times the design pressure.
6.2.4.2 For the bladder accumulator other than 6.2.4.1, it shall meet one of the following requirements.
a) Carry out fatigue analysis according to JB4732-1995, and provide the fatigue test requirements in the design drawings;
b) Carry out the fatigue test according to the requirements of F.2 Type II fatigue test.
6.2.5 Diaphragm accumulator
6.2.5.1 For the threaded diaphragm accumulators meeting the following conditions at the same time, the fatigue test shall be carried out in accordance with the requirements of F.1 Class I fatigue test;
Negotiation between the supplier and the purchaser can also be carried out according to the requirements of F.2 Type II fatigue test.
a) The design pressure is not greater than 35MPa;
b) During normal operation, the pressure fluctuation range is not greater than 0.5 times the design pressure.
6.2.5.2 For the threaded diaphragm accumulator other than 6.2.5.1, it shall meet one of the following requirements.
a) Carry out fatigue analysis according to JB4732-1995, and provide the fatigue test requirements in the design drawings;
b) Carry out the fatigue test according to the requirements of F.2 Type II fatigue test.
6.2.5.3 See Appendix C for strength calculation and type test requirements of welded diaphragm accumulators.
6.2.6 Piston accumulator
6.2.6.1 For piston accumulators that meet the following conditions at the same time, the fatigue test shall be carried out in accordance with the requirements of F.1 Class I fatigue test;
It can also be carried out according to F.2 Type II fatigue test requirements.
a) The design pressure is not greater than 35MPa;
b) The volume is not greater than 250L;
c) The inner diameter is not greater than 350mm;
d) During normal operation, the pressure fluctuation range is not greater than 0.5 times the design pressure.
6.2.6.2 For piston accumulators other than 6.2.6.1, one of the following requirements shall be met.
Shell manufacturing regulations should meet the requirements of Appendix C.
7.1.4 The material of the accumulator shell (including cylinder and end cover) shall retain the traceability mark during the manufacturing process, and the expression of the mark shall be determined by the manufacturing order.
Bit regulations or according to drawing requirements.
7.2 Appearance quality
7.2.1 The inner and outer surfaces of the shell of the bladder accumulator shall be treated, the quality shall reach Sa2.5, the transition between the shell and the head shall be smooth, and there shall be no cracks,
Folds, wrinkles, heavy skins, inclusions, grooves and mechanical damage and other defects affecting strength and corrosion resistance. Piston type, diaphragm type accumulator meter
Surface roughness should meet the requirements of the accumulator.
7.2.2 The surface of the exposed parts of the accumulator should be treated with anti-corrosion coating or other methods. In addition to stainless steel materials, anti-corrosion materials
It should not only meet the requirements of JB/T 4711, but also meet the requirements of design documents.
7.3 Manufacturing tolerances
7.3.1 The outer diameter, roundness and straightness of the shell shall be marked on the drawing. For cylindrical shells, the manufacturing tolerances shall meet the following requirements.
a) For shell roundness, the difference between the maximum and minimum outer diameter measured on the same section shall not exceed 2% of the average outer diameter of the section;
b) The straightness deviation of the shell shall not exceed 2‰ of its length.
7.3.2 The minimum thickness of the shell, head and end cover shall not be less than the design thickness specified in the drawings.
7.3.3 The thread size shall comply with the provisions of GB/T 196, and the thread tolerance shall comply with the provisions of GB/T 197; the thread tolerance class shall not be greater than
Level 6.
7.4 Heat treatment
7.4.1 The accumulator manufacturer shall ensure that the completed shell, end cover and other pressure components meet the material performance requirements specified in Chapter 5.
7.4.2 When the accumulator manufacturer uses outsourced shells and other pressure components for assembly and production, it shall ensure that the outsourced shells and other pressure components
Compression components meet the material performance requirements specified in Chapter 5.
7.4.3 The manufacturer shall evaluate the heat treatment process, establish and improve a qualified heat treatment system, and ensure that the materials of the pressure components meet the requirements specified in Chapter 5.
Regulation.
7.4.4 During heat treatment, it shall be carried out in strict accordance with the qualified heat treatment process.
7.4.5 The heat treatment device should be able to automatically record the relationship between heat treatment time and temperature.
7.5 Hardness
The shell after quenching and tempering heat treatment shall be subjected to Brinell hardness test according to GB/T 231.1, and the test parts shall be taken from both ends and the middle of the shell
For 3 different test surfaces, each test surface shall have no less than 4 test points, and shall be evenly distributed. For length less than 1500mm, nominal
For shells with a thickness not greater than 13mm, the measuring points shall be taken on the test surfaces at both ends of the shell, and the test points on each test surface shall not be less than 2.
Hardness values shall be treated as if taken from one test surface. Brinell hardness should meet the following requirements.
a) The average value of the Brinell hardness (HBW) of each test surface shall meet the requirements in Table 2;
b) The difference between the average hardness values of different test surfaces shall not be greater than 40HB.
7.6 Non-destructive testing
7.6.1 After quenching and tempering heat treatment, the outer surface magnetic particle inspection should be carried out according to NB/T 47013.4, and the grade I is qualified.
7.6.2 The thread of the piston accumulator shell should be tested for penetration according to NB/T 47013.5 before assembly, and the grade I is qualified.
7.7 Assembly
7.7.1 The accumulator should be assembled according to the drawings.
7.7.2 Before assembly, each component should be cleaned and inspected. The inner surface of the shell should be clean without any sundries; the quality of the spacer should meet the requirements
--- "This product is a pressure vessel, it can only be dismantled after depressurization";
--- "This product can only be filled with nitrogen", etc.
10.2 Transport packaging
The coating, packaging and transportation of the accumulator shall comply with the provisions of JB/T 4711.
11 random files
11.1 Accompanying documents shall at least include product qualification certificate, instruction manual and quality certificate, as-built drawing (copy) and special equipment manufacturing supervision
Supervisory inspection certificate (provided by supervisory inspection products).
11.2 Instructions for use shall include design pressure, test pressure, allowable operating temperature range, allowable operating pressure fluctuation range and number of cycles
Requirements, working medium, installation and connection form, use and maintenance, etc.
11.3 The quality certificate shall include the batch inspection items and item-by-piece inspection data specified in this standard.
11.4 Document preservation. The technical documents and records related to accumulator products shall be archived and preserved, and the preservation period shall not be less than the design and use period of accumulator products.
Use the number of years. At least the following technical documents shall be kept for reference by batch number.
---Quality Plan;
---Manufacturing process diagram or manufacturing process card;
--- Quality certification documents;
--- Documentation of welding process and heat treatment process;
---Records of inspection and test items required in the standard;
---Inspection, inspection and test records during and after the manufacturing process;
---Original design drawing of the accumulator.
12 Safe use of accumulators
12.1 Overview
12.1.1 The user unit should be equipped with safety personnel who have professional knowledge of pressure vessels and are familiar with relevant national laws, regulations, safety technical specifications and standards.
All management personnel are responsible for the daily management of the accumulator.
12.1.2 The accumulator shall be filled with medium in strict accordance with this standard and the product instruction manual.
12.2 Safety devices
12.2.1 Safety valve, rupture disc
In order to prevent the internal pressure of the accumulator from exceeding the maximum allowable working pressure, a safety device should be installed in the hydraulic system equipped with the accumulator. Commonly used security
The whole device is a safety valve, but for special occasions (mainly on the gas side), a bursting disc is also available. Bladder type, diaphragm type, piston type accumulator safety
The valve can be installed at the oil inlet, but a cut-off valve should not be installed between the accumulator and the safety valve.
Normally open in working state.
The operating pressure of the safety device shall be in accordance with the provisions in Appendix B of GB/T 150.1-2011, and the safety valve shall not be used to limit the normal
Working pressure or other control functions.
12.2.2 Pressure gauge
The pressure gauge shall pass the calibration and be within the validity period, its measuring range shall be 1.5 times to 3 times of the maximum allowable working pressure, and its accuracy shall not be lower than 1.6 grade.
The maximum allowable pressure shall be indicated with a red warning mark. Pressure gauges can be installed in.
a) On the joint connected to the accumulator;
b) On the pressure source pipeline leading to one or more accumulators, the pressure gauge on the pressure source pipeline shall not be isolated from the accumulator by a shut-off valve.
leave.
12.2.3 Closing the device
In order to facilitate the maintenance of the accumulator, charging operation or shut down the accumulator when the accumulator is shut down for a long time, an air compressor should be installed between the hydraulic source and the accumulator.
Stop valve. In order to prevent liquid backflow, a one-way valve can be set between the hydraulic source and the accumulator, and at this time it is not necessary to set a closing device. set off
The closing device should be easy to operate.
12.2.4 Pressure relief device on the liquid side
When the hydraulic system equipped with an accumulator is closed or when the circuit is disconnected, the system shall automatically remove the pressure on the liquid side. in special circumstances
However, where pressure is required after the machine is switched off (for example, when using an accumulator to maintain pressure in a hydraulic clamping device), the accumulator can be actively isolated
leave.
The pressure relief device may be a pressure relief valve, a ball cock, a center position opening, or a directional control valve with an end position opening. in operation release
The relevant pressure gauges shall be visible when the device is installed.
12.2.5 Pressure relief device on the gas side
According to the manufacturer's product instruction manual, use a special inflation device to safely open the inflation screw or inflation valve for partial release.
Release or fully release inflation pressure.
12.3 Inspection and testing before use
12.3.1 The following items should be checked before all accumulators are used.
a) Whether the factory data conform to the provisions of this standard;
b) Whether the appearance is intact and whether there is any damage affecting the safety performance;
c) Whether the nameplate and steel stamp are consistent with the factory data.
12.3.2 Accumulator installation and inspection.
a) The accumulator should be installed vertically with the charging valve facing upwards. To facilitate maintenance and inspection, a certain space should be left at the charging valve end.
b) The accumulator should be firmly installed on the fixed bracket or on the wall, and the installation position should consider the mechanical damage caused by shock or vibration.
Potential factors and the possibility of external corrosion. When the accumulator is used for buffering and absorbing pulses, its installation position should be close to the vibration
moving source.
c) The accumulator shall not be fixed by welding.
d) Check the installation and fixation of the accumulator before use to avoid danger to the user or people around. should always be kept
Nameplates and warning signs are easy to identify.
12.3.3 Inspection of safety devices.
a) The safety valve and/or rupture disc shall pass the calibration and be within the validity period, and its set pressure shall meet the requirements of 12.2.1;
b) Whether the return pipeline is installed correctly;
c) Whether the pressure gauge is installed correctly, and whether the range and accuracy meet the requirements;
d) Whether other safety devices specified in 12.2 are properly installed;
e) Whether all connecting pipes are installed correctly, the connecting pipes should ensure the normal circulation of hydraulic oil and meet the requirements of working pressure without affecting
affect the work of other safety devices;
f) Whether the warning signs are easy to identify;
g) If the user does not have the ability to check the safety device, he should entrust a technician with corresponding professional knowledge to carry out the inspection.
12.4 Limitations during inflation
12.4.1 The accumulator should be connected to the charging port or charging valve using a special charging device, and filled with oxygen-free dry nitrogen. When the air source pressure is high
When the maximum allowable working pressure of the accumulator is used, a decompression device should be connected between the outlet of the gas source and the inflation tool, and the decompression device should be equipped with two pressure
Force gauges [one high pressure gauge (intake) and one low pressure gauge (outlet)], low pressure adjustment knob, shut-off device and integral pressure relief device.
12.4.2 It is strictly forbidden to fill the accumulator with oxygen, compressed air or other flammable and oxidizing gases, otherwise it will easily cause an explosion.
12.5 Inspection and maintenance
12.5.1 After the accumulator is put into use, the inflation pressure should be checked regularly. New accumulators put into use should be inspected every week in order to timely
Leaks were found.
12.5.2 When the device is out of service for a long time, the shut-off valve between the oil inlet and the hydraulic source should be closed to keep the oil pressure of the accumulator above the inflation pressure.
12.5.3 The disassembly of the accumulator must be carried out under the guidance of professional technicians. Before disassembling the accumulator, the oil pressure should be removed and an air charging tool should be used.
Release gas pressure.
12.6 Scrapping
12.6.1 If the accumulator shell is found to have obvious mechanical damage or its components are severely corroded during use, it should be replaced in time and scrapped.
12.6.2 The accumulators whose service life exceeds the designed service life shall be destroyed after they are scrapped.
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