GB 15385-1994 Gas cylinder hydraulic burst test method

This standard specifies the basic requirements, test methods and key points for the test device of the hydraulic burst of gas cylinders. This standard is applicable to the hydraulic burst test of steel and aluminum alloy gas cylinders with a nominal working pressure of 1 to 30 MPa and a nominal volume of 0.4 to 1000L. GB 15385-1994 Gas Cylinder Hydraulic Burst Test Method GB15385-1994 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
Method for hydraulic burst test of gas cylinders
Method for hydraulic burst test of gas cylinders1 Subject content and scope of application
GB 15385-94
This standard specifies the basic requirements, test methods and key points of operation for the test device of hydraulic burst of gas cylinders. This standard is applicable to the hydraulic burst test of steel and aluminum alloy gas cylinders with a nominal working pressure of 1 to 30 MPa and a nominal volume of 0.4 to 1000L. 2 Reference standards
GB9251 Method for hydraulic burst test of gas cylinders
3 Terminology
3.1 Test cylinder
The gas cylinder to be tested or being tested.
3.2 Burst pressure
The highest pressure actually reached during the bursting process of the gas cylinder. 3.3 Yield pressure
The pressure at which the material of the test cylinder begins to yield along the wall thickness under the action of internal pressure. Volumetric deformation determination method
This standard adopts the water pressure internal measurement method to carry out the hydraulic pressure burst test and determine the volumetric deformation when the test bottle ruptures. If it is necessary to determine the volume residual deformation rate under the hydraulic pressure test during the burst test, the volume residual deformation rate determination method in GB9251 shall be followed. 5 Test operators
The test operators must undergo special training, be familiar with the test equipment, and master the test method. 6 Test equipment
6.1 Schematic diagram of the test equipment (see Figure 1).
Approved by the State Administration of Technical Supervision on December 26, 1994 608
Implementation on August 1, 1995
GB15385-94
Figure 1 Schematic diagram of the hydraulic pressure burst test equipment
W.-Test water; J-Hydraulic pump; 1-Test bottle, R-Special joint, F, FF. -Low-pressure valve: H-Quantity set; K. --Pressure measuring instrument (indicating the outlet pressure of the water pump); K--Pressure measuring instrument (for reading the test pressure); K,--Precision pressure gauge (for calibrating other pressure measuring instruments); E, E, E. E-High pressure valve (E, closed during the test); L-Measuring cup M-Safety protection facilities
6.2 The device must be equipped with effective facilities for manual or automatic control of the test pressure. 6.3 In addition to the test pressure, the test bottle shall not be subjected to other external forces that may affect the stress of the bottle body. 6.4 The inside of the device must be clean.
6.5 The rated pressure of the pressure test pump shall be more than 1.5 times the value calculated according to formula (1). Ph
Where: Pb
-burst pressure;
D. External diameter of the test bottle, mmbzxZ.net
O——Guaranteed value of tensile strength of the test bottle body material after heat treatment, N/mm; S.
Nominal thickness of the test bottle body, mm.
6.6 The joints of the device must have good sealing performance. 6.7 The device should be able to exhaust the air inside it and the test bottle. 6.8 The device should be able to automatically record the relationship between pressure and water pressure, and automatically draw a pressure-time curve. (1)
6.9 All pressure-bearing pipes of the device must be made of metal pipes, and the water pressure in the pipe under the bursting pressure of the test bottle should be measured (the water pressure should not be counted in the pipe volume).
6.10 The device and pressure-bearing pipes must be subjected to water pressure test, and the qualified water pressure test pressure should not be less than 1.5 times of P. 7 Check pressure gauges and weighing instruments
7.1 Pressure gauges
At least two pressure gauges with the same range and capable of correctly displaying the test pressure at the same time should be installed on the test device. The range should be 1.5 to 3 times the calculated bursting pressure P of the test bottle. The pressure gauges must be calibrated and qualified, and their accuracy should not be less than Class 1.5. 7.2 Temperature measuring instrument
GB15385—94
The temperature measuring instrument used to measure the test water temperature and the ambient temperature shall have a minimum display value of no more than 1°C. 7.3 Measuring cylinder
7.3.1 The measuring cylinder used in the test device shall have an appropriate volume and diameter to prevent the water level in the measuring cylinder from dropping too quickly when the pressure is increased and affecting the reading. The minimum scale value of the measuring cylinder shall not exceed 5mL (large volume gas cylinder) or 1mL (medium and small volume gas cylinder), and the relative error of the scale value shall not exceed ±1%. 7.3.2 The verticality and stability of the measuring cylinder shall be maintained. 7.4 Measuring cup
The measuring cup used in the test shall have a range of 500mL or 1000mL, and the relative error of the scale value shall not exceed ±1%. 7.5 Weighing scale
The maximum range shall be 1.5 to 3 times the weight of the bottle. 8 Test water
8.1 The water used for the test must be clean fresh water, and the water supply must be stable and continuous. 8.2 The water temperature during the test shall not be lower than 5℃. The ambient temperature during the test shall not be lower than 5℃. 8.3 The difference between the water temperature in the test bottle and the water temperature to be pressed into the test bottle shall not be greater than 2℃. 9 Preparation before the test
9.1 The test bottles must be inspected and qualified one by one in accordance with the provisions of relevant standards. 9.2 The inner surface of the test bottle should be clean, and the detachable accessories should be removed to remove the residue in the bottle. 9.3 Draw a wall thickness distribution grid on the surface of the test bottle cylinder. The grid spacing should not be less than 100mm; for test bottles with a volume less than 100I, the grid spacing should be less than 20 mm, and the recognition clarity of the grid should be maintained until the gas cylinder explodes. 9.4 Measure the wall thickness of each point at the intersection of the grid, and circle the part with the minimum wall thickness. 9.5 Measure the circumference of the upper, middle and lower parts of the test bottle cylinder. 9.6 Remove impurities from the bottle, weigh the empty bottle of the test bottle, fill it with water and let it stand. Use a mallet to tap the body of the test bottle to make the bubbles attached to the inner wall float out, then weigh the empty bottle after filling it with water and calculate the actual volume. 9.7 When testing the gas cylinder, there should be no grease in the test device and the gas cylinder. 10 Operation steps and test records
10.1 Record the relevant data of the test bottle
Record the batch number, factory number, nominal working pressure, water pressure test pressure, gas cylinder volume, gas cylinder weight, and production date of the test bottle. Measure and record the test water temperature and ambient temperature. Calculate and record the actual volume of the test bottle. 10.2 Tighten the special joint R on the test bottle I and connect the test bottle I to the test device. 10.3 Filling and exhausting
When valves E and F are closed, water is injected into the vector H through valve F. When water flows out of valve F. When the water flows out, close F. and E. Start the hydraulic pump J and use valve F to control the height of the water level in the measuring cylinder. When water flows out from valve E., close E. 10.4 Inspection of pipeline tightness
All inspected surfaces must be kept dry before inspection. Continue to start the hydraulic pump J. When the indications of the pressure measuring instruments K. and K. rise to the nominal working pressure of the test bottle 1, stop the hydraulic pump and close valve E to check for leaks. During the pressure stop and leak check, the pressure gauge pointer should not drop back. If the test bottle I is found to have a leak, open valves E. and E. to release the pressure, record the leakage and terminate the test of the bottle. 10.5 Inspection of exhaust effect
When no leakage is confirmed, open valve E and use valve E. to slowly reduce the pressure until the indications of the pressure measuring instruments K. and K. reach "zero". During the pressure reduction process, carefully observe whether there are bubbles floating in the measuring cylinder H. If bubbles float out, re-exhaust according to 10.1.3. If no bubbles float out, proceed to the next step.
10.6 Pressure increase
GB 15385-94
10.6.1 Close valve E., and adjust the water level in the measuring cylinder to the \0\ scale line on the measuring cylinder H by opening or closing valves F and F. 10.6.2 Start the hydraulic pump J, and the indications of pressure measuring instruments K. and K. slowly increase, and the water level in the measuring cylinder H gradually decreases. When the water level in the measuring cylinder H drops to a certain level, you can use the measuring cup L to fill a certain amount of water and pour it into the measuring cylinder H one by one, and make a record. 10.6.3 The pressure must be increased slowly and steadily. The corresponding values ​​of pressure and water volume should be automatically recorded, and the pressure and water volume curve should be drawn to determine the pressure when the gas cylinder begins to yield.
10.6.4 Before the test bottle bursts, pay close attention to the pressure and the amount of water pressed in. When bursting, the bursting pressure and the total amount of water pressed in must be automatically recorded.
10.6.5 Remove the test bottle
First remove the test bottle I from the test device, and then remove the special joint R. 10.6.6 Measure the test bottle
Measure and record various data after the test bottle bursts, record the shape, size and characteristics of the bursting hole, and take photos when necessary. 11 Calculation
11.1 The volume deformation rate of the test bottle when it bursts is calculated according to formula (2): E
Where: E-volume deformation rate of the test bottle when it bursts, %; AV-volume deformation value of the test bottle when it bursts, mL; V
actual volume of the test bottle, mL.
×100%
11.2 The volume deformation value AV of the test bottle under the bursting pressure is calculated according to formula (3) (only applicable to gas cylinders above 12L): AV = A- B-(V+ A- B)P β
Wherein: A-
Total amount of water pressed into the test bottle under the bursting pressure, mL; amount of water pressed into the pressure pipe under the bursting pressure, mL; B
P, — bursting pressure of the test bottle, MPa;
βe — average compressibility coefficient of water at the test temperature and bursting pressure of the test bottle (see Appendix A (Supplement)), MPa-1; volume of the test bottle, mL.
12 Post-test records
The following contents must be recorded after the test:
Test date;
Test water temperature;
Actual volume of the test bottle;
Corresponding curve chart of pressure and water volume of the test bottle; Pressure when the test bottle begins to yield;
Burst pressure of the test bottle;
Total water volume when the test bottle ruptures;
Water volume of the pressure pipe under the rupture pressure of the test bottle; Volume deformation rate when the test bottle ruptures;
Shape, size, characteristics and position of the rupture of the test bottle; What kind of abnormal bottle body phenomenon has occurred;
Signature of the tester and inspector.
13 Test report format
GB15385-94
Evaluate the test results according to the corresponding standards, and the test report format shall be in accordance with Appendix B (reference). 14 Precautions during the test
14.1 When installing the pressure measuring instrument, pay attention to exhausting the air in the pressure measuring instrument and its pipe. 14.2 During the pressure increase process, if the pressure increase speed is found to be significantly increased or decreased, the hydraulic pump should be stopped immediately, the cause should be found and eliminated. If the bottle is leaking, the test of the bottle should be terminated. 14.3 The test bottle must be free from impact or collision. No one should approach when the pressure exceeds the water pressure test pressure. 14.4 It is strictly forbidden to disassemble and install pipes, pressure measuring instruments, test bottles and other pressure-bearing parts or tighten the joints of pressure-bearing pipes under pressure. 14.5 Prevent the test bottle from exploding and tipping over instantly to damage the test device or instrument. 14.6 Safety protection facilities and eye-catching signs must be set up at the test site. 14.6.1 The test site must be equipped with isolation. 14.6.2 There must be no other pressure vessels and flammable items around the test site. 14.6.3 The test operator should be in a safe area and other personnel should not approach. 612
GB 15385—94
Appendix A
Average compressibility coefficient of water during test
(Supplement)
Average compressibility coefficient of water at test water temperature and bursting pressure of test cylinder β.,MPa-1B.=(K×105 6.8P)×10-
0. 048 86
0. 047 92
-、Data measurement before test
1. Wall thickness measurement
Appendix B
Report on water pressure bursting test of gas cylinder
(Reference)
Test time:
Table (1)
Minimum wall thickness
2. Geometric dimensions and positions to be measured
GB 15385—94
Continued Table (1)
Li is the distance between the annular seams; L is the circumference at different positions; t refers to the cylinder; f refers to the head. 4
Table (2) Geometric dimension values
3. Measure the water pressure (B) value L under the bursting pressure of the pressure-bearing pipeline
Table (3)
4. Measure the volume V: mL
.5. Measure the water temperature: water to be used
6. Measure the air temperature: ℃
II. Test data and results
1. Determination of volume deformation and volume residual deformation rate 614
Minimum wall thickness
Total water pressure value A
Calculation refers to GB9251.
Note: ①『
Volume residual deformation value of the test bottle.
2. Burst test data and results
Inlet volume, mL
Total amount of water pressed into the test bottle when it bursts
GB 15385--94
Table (4)
Table (5)
b. Relationship curve between pressure P and water inlet volume, mL
Pressure when the test bottle yields
Explanation of bursting crack
MPa; Burst pressure of the test bottle
Crack location and shape:
nComparison
Water inflow, mL
Burst hole properties:
Whether the burst hole is qualified:
Test conclusion:
Signature and seal of test operator:
15385-94
Year and month
Additional instructions:
15385-94
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is technically coordinated and interpreted by the National Technical Committee for Standardization of Gas Cylinders. This standard was drafted by Beijing Metal Structure Factory. The main drafters of this standard are Qiu Changliu, Liu Shouzheng and Li Xiuzhen. 617Temperature measurement: ℃
II. Test data and results
1. Determination of volumetric deformation and volumetric residual deformation rate 614
Minimum wall thickness
Total water pressure value A
Calculation refers to GB9251.
Note: ①『
Volume residual deformation value of the tested bottle.
2. Explosion test data and results
Inlet volume, mL
Total amount of water pressed into the test bottle when it exploded
GB 15385--94
Table (4)
Table (5)
b. Relationship curve between pressure P and water inlet volume, mL
Pressure when the test bottle yields
Explanation of the bursting hole
MPa; Explosion pressure of the test bottle
Location and shape of the crack:
nComparison
Water inflow, mL
Burst hole properties:
Whether the burst hole is qualified:
Test conclusion:
Signature and seal of test operator:
15385-94
Year and month
Additional instructions:
15385-94
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is technically coordinated and interpreted by the National Technical Committee for Standardization of Gas Cylinders. This standard was drafted by Beijing Metal Structure Factory. The main drafters of this standard are Qiu Changliu, Liu Shouzheng and Li Xiuzhen. 617Temperature measurement: ℃
II. Test data and results
1. Determination of volumetric deformation and volumetric residual deformation rate 614
Minimum wall thickness
Total water pressure value A
Calculation refers to GB9251.
Note: ①『
Volume residual deformation value of the tested bottle.
2. Explosion test data and results
Inlet volume, mL
Total amount of water pressed into the test bottle when it exploded
GB 15385--94
Table (4)
Table (5)
b. Relationship curve between pressure P and water inlet volume, mL
Pressure when the test bottle yields
Explanation of the bursting hole
MPa; Explosion pressure of the test bottle
Location and shape of the crack:
nComparison
Water inflow, mL
Burst hole properties:
Whether the burst hole is qualified:
Test conclusion:
Signature and seal of test operator:
15385-94
Year and month
Additional instructions:
15385-94
This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is technically coordinated and interpreted by the National Technical Committee for Standardization of Gas Cylinders. This standard was drafted by Beijing Metal Structure Factory. The main drafters of this standard are Qiu Changliu, Liu Shouzheng and Li Xiuzhen. 617
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