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GB/T 9252-2017 English PDF (GBT9252-2017)

GB/T 9252-2017 English PDF (GBT9252-2017)

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GB/T 9252-2017: Method for pressure cycling test of gas cylinders

This Standard specifies the method for pressure cycling test of gas cylinders, basic requirements for test device. This Standard is applicable to the pressure cycling test of gas cylinders with nominal working pressure no greater than 70MPa (gauge pressure, the same below). This Standard is inapplicable to the gas cylinders filled with stuffing.
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 23.020.30 J 74
GB/T 9252-2017
Replacing GB/T 9252-2001
Method for Pressure Cycling Test of Gas Cylinders
Issued on. October 14, 2017 Implemented on. May 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Basic Requirements for Testing Apparatus ... 6
5 Measuring Instrument ... 8
6 Test Medium and Test Temperature ... 9
7 Basic Requirements for Test ... 9
8 Test Precautions ... 10
9 Test Records and Reports ... 10
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard Replaced GB/T 9252-2001 Method for Cycling Test of Gas Cylinders. Compared with GB/T 9252-2001, this Standard has the major technical changes besides editorial modifications.
--- Modify the applicable scope of the standard;
--- Add normative references;
--- Give definitions against the terminology involved in this Standard; --- Delete testing apparatus flow chart;
--- Modify and improve the basic requirements for testing apparatus;
---Supplement the requirements for use, installation, accuracy, and etc. of measuring instrument; --- Delete the relevant provisions of the tested cylinder; --- Modify the basic requirements for test; --- Delete the terms and conditions that belongs to the post operating methods and test operating procedures;
--- Delete the relevant provisions of test after test;
--- Specify the test records and report contents;
--- Delete Appendix A in Edition 2001;
--- Delete Appendix B in Edition 2001. Please note that some of the contents of this document may involve patents. The issuing agency of this document doesn?€?t assume responsibility for identifying these patents. This Standard was proposed and under the jurisdiction of National Technical Committee for Standardization of Gas Cylinders (SAC/TC 31).
Drafting organizations of this Standard. Dalian Boiler and Pressure Vessel Inspection Institute, Dalian University of Technology. Jiangsu Tianhai Special Equipment Co., Ltd., Sinoma Science and Technology (Chengdu) Co., Ltd.
Method for Pressure Cycling Test of Gas Cylinders
1 Scope
This Standard specifies the method for pressure cycling test of gas cylinders, basic requirements for test device. This Standard is applicable to the pressure cycling test of gas cylinders with nominal working pressure no greater than 70MPa (gauge pressure, the same below). This Standard is inapplicable to the gas cylinders filled with stuffing. 2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document. GB/T 13005 Terminology of Gas Cylinders
3 Terms and Definitions
The following terms and definitions and those ones stipulated in GB/T 13005 are applicable to this document. 3.1 Pressure cycling
When taking the pressure cycling test, a pressure cycling is called for a whole process in sequence of increasing pressure to the required upper pressure ??? holding ??? decreasing pressure to the required lower pressure ??? holding. 3.2 Cyclic pressure
The repetitive alternating pressure values applied during the pressure cycling test, which include upper limit of cyclic pressure, and lower limit of cyclic pressure. 3.3
Required upper pressure
4.12
The testing apparatus shall be provided with mechanical safety device such as mechanical overflow valves to prevent the overpressure. The upper limit of the cyclic pressure specified in pressure cycling test. 4.13 The testing apparatus shall be equipped with auxiliary equipment such as cooling, filtering devices to keep the valve and pump running continuously. 4.14
The testing system shall take appropriate safety precautions to ensure the safety of operator sand equipment during the test. 5 Measuring Instrument
5.1
Pressure measuring instrument
5.1.1 To meet the relevant requirements of 4.11, the testing apparatus shall be equipped with at least a precision pressure gauge, an electrical contact pressure gauge and a pressure sensor (or digital pressure gauge that can output a pressure signal). If no electrical contact pressure gauge is used, there shall be installed at least a precision pressure gauge, a general pressure gauge and two pressure sensors (or digital pressure gauge that can output a pressure signal) at the same time. Before the test, use the precision pressure gauge to check the pressure display value of the pressure measuring instrument; if there is any abnormal pressure, it shall be replaced promptly. When taking the pressure cycling test, the precision pressure gauge may not be used. The installation positions of the pressure gauge (including general pressure gauge and electrical contact pressure gauge), pressure sensor (or digital pressure gauge that can output a pressure signal) and precision pressure gauge shall meet the requirements of 4.10. 5.1.2 The measuring range of pressure gauge (including general pressure gauge and electrical contact pressure gauge) shall be 2~3 times of the required upper pressure of the tested cylinder; the accuracy level shall be no less than Level-1.6; the measuring range of precision pressure gauge shall not exceed 2 times of the required upper pressure of the tested cylinder, the accuracy level shall be no less than Level-0.4; the measuring range of pressure sensor or digital pressure gauge that can output pressure signal shall not exceed 3 times of the required upper pressure of the tested cylinder, the accuracy level shall be no less than Level-0.5. 5.1.3 The pressure measuring instrument shall be tested regularly, the testing period shall be performed as per the relevant provisions. 5.2 Temperature measuring instruments
5.2.1 The measuring range of temperature sensor for measuring the temperature of test medium and outer surface of tested cylinder shall be within 2 times of the test temperature range of tested cylinder, and its minimum display value shall be no greater 8 Test Precautions
8.1 For larger tested cylinder, fillers such as aluminum block or rod can be filled into the cylinder before filing the test medium, so as to improve the pressure-increasing and pressure-decreasing rate. The filler and test medium shall not occur chemical action, and shall not generate impact or friction against the inner wall of cylinder as the pressure cycling. 8.2 In addition to the cyclic pressure and connecting pipe?€?s action force against the cylinder mouth during the test, no additional force shall be imposed on the tested cylinder that may influence the stress state of the cylinder. 8.3 If the pressure cycling is found abnormal during the test, stop the test immediately; check and continue the test after the abnormal conditions are removed. 8.4 When the testing system is in the state of bearing pressure, it is not allowed to tighten or disassemble the tested cylinder or other pressure-bearing components. 8.5 No one shall approach the testing system with pressure during the test. 8.6
In addition to use for the inspection related to the purpose of the test or for subsequent tests, the cylinder after taking the pressure cycling test shall be eliminated the functions of use. 9 Test Records and Reports
9.1
The relevant information and data during the test process shall be recorded as per the actual conditions of the cylinder pressure cycling test. After the completion of the test, the testing system can automatically generate test records; the test records shall take the picture, PDF and other document format that can?€?t be changed. The test records shall be detailed, true, accurate and traceable. In addition to recording the relevant information and major technical parameters (including entrusted organization, product name, model and specification, cylinder No., nominal working pressure, hydraulic test pressure, nominal volume, cylinder materials, etc.) of the tested cylinder, test basis, test time, required upper pressure, required lower pressure, the test records shall also include the following major contents. a) Test records automatically generate time;
b) Testing apparatus and measuring instrument;
c) Test medium;

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