GB/T 9251-2022 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 9251-2022 | English | 260 |
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Methods for hydrostatic test of gas cylinders
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| GB/T 9251-2011 | English | 125 |
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Methods for hydrostatic test of gas cylinders
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| GB/T 9251-1997 | English | 639 |
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Method for hydraulic test of gas cylinders
| Obsolete |
| GB/T 9251-1988 | English | RFQ |
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Method for hydraulic test of gas cylinders
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GB/T 9251-2022: Methods for hydrostatic test of gas cylinders---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/GBT9251-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.30
CCS J 74
Replacing GB/T 9251-2011
Methods for hydrostatic test of gas cylinders
Issued on. MARCH 09, 2022
Implemented on. OCTOBER 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Principle... 6
5 Test conditions... 7
6 Instruments and equipment... 7
7 Pressure proof test... 10
8 Water jacket method... 12
9 Direct expansion method... 16
10 Rounding rules for calculated values... 20
11 Precautions in the test... 20
Annex A (normative) Verification of test devices for water jacket method... 22
Annex B (informative) Average compression factor of water... 26
1 Scope
This document specifies the basic requirements for hydrostatic test methods and devices
of gas cylinders.
This document is applicable to the hydrostatic test of gas cylinders whose nominal
working pressure is not more than 70MPa (gauge pressure, the same below).
This document does not apply to gas cylinders filled with solid fillers.
2 Normative references
The 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/T 13005, Terminology of gas cylinders
GB/T 35015, Calibration method for calibrated cylinder used in water jacket
hydrostatic test
JJG 539, Digital Indicating Weighing Instruments
JJG 1036, Verification Regulation for Electronic Balance
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 13005 as
well as the followings apply.
3.1 testing cylinder
Cylinders to be tested or being tested.
3.2 pressure proof test
A process of testing and verifying the safe bearing capacity of the testing cylinder after
it is pressurized to its hydraulic test pressure and maintained for a specified period of
time.
3.5 special water jacket
A special equipment for measuring the volumetric deformation of the testing cylinder
during the hydrostatic test by water jacket method.
3.6 calibrated cylinder
A bottle equipment that if the corresponding relationship between the calibration
pressure and the expansion value has been determined, the expansion value shall have
the characteristics of repeatability and linearity, and there will be no permanent
deformation under the calibration pressure. It is used to verify the accuracy of the
hydrostatic test device of gas cylinders.
3.7 calibrated gauge
A pressure measuring instrument for verifying the pressure value of the test system. Its
accuracy level shall not be less than that of other pressure measuring instruments.
3.8 reference zero point
Zero reading on water volume measuring instrument. The error shall be the larger value
of ±0.1% of the total volumetric deformation value and ±0.1mL.
4 Principle
The hydrostatic test of gas cylinders uses water as the pressurized medium. Gradually
increase the pressure in the testing cylinder to its hydrostatic test pressure according to
the specified pressurization rate.
5 Test conditions
5.1 The test water shall be clean fresh water. When the testing cylinder is a chromium-
containing alloy steel gas bottle, the chloride ion content in the test water shall not
exceed 25mg/L.
5.2 The temperature of the test water shall not be lower than 5℃. The difference
between it and the ambient temperature shall not be greater than 2℃.
6 Instruments and equipment
6.1 Basic requirements for test device
6.1.1 The testing cylinder shall be pressurized by a plunger pump, a pneumatic pump
or other pressurizing device with stable pressure output. Use water as the pressurized
medium.
6.1.3 Metal pipes shall generally be used for pressure-bearing pipeline. They shall be
fixed. The connection with the test device and the measuring instrument shall have a
good seal. The pressure-bearing capacity of the pressure-bearing pipeline shall meet the
requirements of the hydrostatic test's pressure of the testing cylinder.
6.1.4 The special water jacket shall be made of stainless steel or other corrosion-
resistant metal materials, with a certain rigidity. Make sure that it does not change in
volume during the hydrostatic test.
6.1.5 The dimensions and materials of all associated piping of the hydrostatic test
devices for water jacket method and direct expansion method shall be such that they do
not deform under the weight of water.
6.1.6 The calibration of the calibrated cylinder shall comply with the provisions of
GB/T 35015.The calibration data of the calibrated cylinder shall be able to meet the
test requirements of the testing cylinder (at least three pressure levels). A clearly
identifiable calibration certificate and label shall be attached.
6.2 Measuring instruments
6.2.1 Pressure measuring instrument
6.2.1.1 A pressure gauge and a calibrated gauge for calibration shall be installed on the
6.2.1.3 The range of the pressure measuring instrument shall be 1.5 times to 3 times the
pressure of the hydrostatic test of the testing cylinder. The accuracy level of the pressure
gauge shall not be lower than level 1.0.
6.2.2 Water volume measuring instrument
6.2.2.1 Electronic balances, measuring tubes or other suitable measuring instruments
can be used as water volume measuring instruments. They are used to measure the total
volumetric deformation value, volumetric residual deformation of the testing cylinder
in the water jacket method and the total pressurized water volume in the direct
expansion method.
6.2.3 Weighing instrument
For the weighing instrument used to weigh the mass of the testing cylinder, the
maximum weight shall be 1.5 times to 3 times the commonly used weighing value. The
allowable error shall meet the requirements of "medium accuracy level" specified by
JJG 539.
6.2.4 Temperature measuring instrument
For the temperature measuring instruments used to measure the temperatures of the test
water and the ambient temperature, the minimum scale value shall not be greater than
1°C.
7 Pressure proof test
7.1 General
It does not need to measure the volumetric deformation for the pressure proof test. If
the filling medium of the gas cylinder and the hydraulic test pressure are the same, the
test can be carried out on multiple testing cylinders at the same time.
7.2 Test device process
The typical flow of the pressure proof test device is shown in Figure 1.
7.3 Test steps
7.3.1 The test device shall be calibrated by a calibrated gauge before use. The error of
the displayed value of the pressure gauge shall not exceed ±2% of the displayed value
of the calibrated gauge. The error of the displayed value of the pressure transmitter shall
not exceed ±1% of the displayed value of the calibrated gauge.
7.3.2 Before the testing cylinder is pressurized, all the air in the cylinder and the
pressure-bearing pipeline shall be exhausted.
7.3.3 When the pressure in the testing cylinder rises to the nominal working pressure of
the gas cylinder, the pressurization can be suspended. Check system connections for
leaks.
7.3.6 The test pressure deviation shall not exceed +3% of the specified test pressure.
Relevant standards for gas cylinders shall comply with the regulations.
7.3.7 The judgment of the test results shall be carried out in accordance with the relevant
standards for gas cylinders.
7.4 Test records and reports
7.4.1 Test records
The test agency shall record the relevant information and data of the test process
according to the actual situation of the gas cylinder pressure proof test. The test records
shall be in a file format that cannot be changed, such as pictures, PDF. Test records shall
be detailed, true, accurate and traceable.
8 Water jacket method
8.1 Test device process
Figure 2 shows the typical flow of the test device for water jacket method.
8.2 Test steps
8.2.1 Use a calibrated cylinder to calibrate the test device before use. Calibration shall
be carried out in accordance with the provisions of Annex A.
8.2.5 The pressure in the testing cylinder rises to the specified test pressure. Hold the
pressure for at least 30s or specified time.
8.2.6 Depressurize to zero. After the testing cylinder is completely shrunk, record the
volumetric residual deformation value of the testing cylinder or the value indicated by
the electronic balance.
8.2.9 Before and after the test, keep the water temperature in the system constant.
8.2.10 The judgment of the test results shall be carried out in accordance with the
relevant standards for gas cylinders.
8.3 Calculation of volume elastic deformation value and volume residual
deformation rate of testing cylinder
The volumetric elastic deformation value of the testing cylinder is calculated according
to formula (1). The volume residual deformation rate is calculated according to formula
(2).
8.4 Test records and reports
8.4.1 Test records
The test agency shall record the relevant information and data of the test process
according to the actual situation of the hydrostatic test by the water jacket method of
the gas cylinder.
8.4.2 Test reports
The test agency shall issue a hydraulic test report based on the test records.
In addition to recording the relevant information and main technical parameters of the
testing cylinder, the test report shall at least include the following main contents.
9 Direct expansion method
9.1 Test device process
The typical flow of test device for direct expansion method is shown in Figure 3.
9.2 Test steps
9.2.1 Use a calibrated gauge to verify the test devices before use. The displayed value
of the pressure gauge shall not exceed ±1.5% of the displayed value of the calibrated
gauge. The displayed value of the pressure transmitter shall not exceed ±1% of the
displayed value of the calibrated gauge.
9.2.4 Before the testing cylinder is pressurized, exhaust all the air in the cylinder and
the pressure-bearing pipeline. It can be pressurized and relieved repeatedly within the
nominal working pressure range until no air bubbles emerge in the water measuring
instrument.
9.2.5 Before starting the test, close the water filling valve and the pressure relief valve.
Keep the indication value of the initial value of the water measuring instrument stable
for at least 5s.
9.2.6 When the pressure in the testing cylinder rises to the nominal working pressure,
suspend the pressurization and inspect it.
9.2.7 The pressure in the testing cylinder rises to the specified test pressure. Hold the
pressure for at least 30s or specified time. During the pressure holding period, the actual
test pressure shall not be lower than the specified test pressure.
9.2.8 Open the relief valve. Depressurize to zero. After the testing cylinder is
completely shrunk, record the volumetric residual deformation value of the testing
cylinder or the value indicated by the electronic balance.
9.2.11 Before and after the test, keep the water temperature in the system constant.
9.3 Calculations of total volumetric deformation value, volumetric elastic
deformation value and volumetric residual deformation value of testing cylinder
9.4 Test records and reports
9.4.1 Test records
The test agency shall record the relevant information and data of the test process
according to the actual situation of the hydrostatic test of gas cylinders by direct
expansion method.
9.4.2 Test reports
The test agency shall issue a hydraulic test report based on the test records.
In addition to recording the relevant information and main technical parameters of the
testing cylinder, the test report shall at least include the following main contents.
10 Rounding rules for calculated values
The calculation results of formula (1) to formula (7) in this document and formula (A.1),
formula (A.2) and formula (A.3) in Annex A are rounded according to the following
rules.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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