GB/T 15385-2022Method for hydraulic burst test of gas cylinder (English PDF)

1 Scope

GB/T 15385-2022 is the Chinese national standard on method for hydraulic burst test of gas cylinder, in the field of fluid systems and general-purpose components. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 9 March 2022 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 October 2022. Classification: ICS 23.020.30, CCS J74. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This document specifies the basic requirements for the hydraulic burst test method and test apparatus for gas cylinders. This document is applicable to the hydraulic burst test of gas cylinder with a nominal working pressure not greater than 70 MPa (gauge pressure, the same below).

2 Normative references

The contents of the following documents, through normative references in this text, constitute indispensable provisions of this document. Among them, for dated references, only the edition corresponding to that date applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 13005 Terminology of gas cylinders JJG 539 Verification regulation of digital indicating weighing instrument JJG 1036 Verification regulation for electronic balance

3 Terms and definitions

The terms and definitions defined in GB/T 13005 and the following ones apply to this document.

3.1 Testing cylinder Gas cylinders to be tested or being tested.

4 Principle

In the hydraulic burst test of gas cylinder, use water as the pressurization medium. According to the specified pressurization rate, gradually increase the pressure in the testing cylinder, until the testing cylinder bursts. Determine the yield pressure of the testing cylinder (when required), the hydraulic burst pressure, and the amount of water pressed in. Calculate the volume deformation value and volume deformation rate of the testing cylinder (when required). And check the cracking forms such as cracking characteristics and cracking position of the testing cylinder.

5 Test conditions

5.1 The test water shall be clean fresh water. Continuous and stable water supply is required.

5.2 The temperature of the test water and the test environment shall not be lower than 5 °C.

7 Test procedure

7.1 Before the test, it shall measure the actual volume of testing cylinder and the temperature of test water.

7.2 After the testing cylinder is filled with water and left standing, before the test, it shall use a mallet or rubber mallet to lightly tap the cylinder body; to exhaust the air bubbles attached to the inner wall of the cylinder. After using water to fill up, connect it to the test system.

7.3 Before the testing cylinder is pressurized, through repeated low-pressure loading, it shall exhaust all the air in the testing cylinder and the pressure-bearing pipeline. It shall be confirmed that there is no leakage in the test system.

7.4 Gradually pressurize the testing cylinder until it bursts. The pressurization rate is measured in megapascals per second (MPa/s). It shall meet the requirements of the product standard for gas cylinder. If there are no requirements in the product standard for gas cylinder, it shall not exceed

0.5 MPa/s.

7.5 During the test, when the test cannot be carried out due to equipment or system failure, if the test pressure in the testing cylinder does not reach the yield pressure, it is allowed to re-test after the failure is repaired. If the test pressure in the testing cylinder has exceeded the yield pressure, the testing cylinder can no longer be tested. Another sample shall be taken again.

7.6 The determination of the test results shall be carried out in accordance with the provisions of the corresponding gas cylinder product standards.

9.2 When the indicated value of the pressure measuring instrument is not reduced to "zero", it shall not disassemble all pressure-bearing parts and disassemble-assemble the testing cylinder on the pressure-bearing pipeline. It shall not tighten the joints on the pressure-bearing pipeline.

9.3 During the test, protective measures such as warning and isolation shall be taken, to ensure that no one shall approach the pressurized test system.

9.4 Reliable safety protection facilities shall be provided in the hydraulic burst test area.

10 Test records and report

10.1 Test records According to the actual situation of the hydraulic burst test of gas cylinder, the test organization shall record relevant information and data of the test process. The test records shall be in content-unalterable file formats such as pictures and PDF. Test records shall be detailed, true, accurate and traceable.

10.2 Test report Based on the test records, the test organization shall issue a hydraulic burst test report. In addition to recording the relevant information and main technical parameters of the testing cylinder, the test report shall also include the following main contents:

a) The number of this document;

c) Water temperature for test;

d) Test ambient temperature;

e) Measured volume of the testing cylinder (when required);

f) Measured yield pressure (when required);

g) Hydraulic burst pressure;

h) Description of fracture morphology; such as cylinder body rupture position (upper, middle, lower, etc.); body rupture shape (fish belly, single fish tail, double fish tail, etc.); body rupture feature size (rupture length, maximum width, etc.); body break characteristics (brittleness, toughness, presence or absence of shear lip, etc.);