GB/T 9251-2011 in English

《GB/T 9251-2011气瓶水压试验方法》由TC31（全国气瓶标准化技术委员会）归口，TC31SC6（全国气瓶标准化技术委员会气瓶检验分会）执行，主管部门为国家标准化管理委员会。

1 Scope

This standard specifies basic requirements for methods for hydrostatic test of gas cylinders and test devices.
This standard is applicable to hydrostatic test for steel seamless gas cylinders, welded gas cylinders, aluminum seamless gas cylinders and fiber-wrapped gas cylinders.
This standard is not applicable to industrial non-refillable steel cylinders and gas cylinders filled with solid filler.

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 amendment) applies.

1 Scope
2 Normative References
3 Terms, Definitions and Symbols
4 Principle
5 Test Devices
6 Test Meters and Instruments
7 Pressure Proof Test
8 Volumetric Expansion Determination of Gas Cylinder by Water Jacket Hydrostatic Test
9 Volumetric Expansion Determination by Hydrostatic Pressure Test
10 Rules for Rounding off of Numerical Values
11 Precautions for Test
Appendix A (Normative) Verification of Water Jacket Hydrostatic Test Devices
Appendix B (Informative) Average Compression Coefficient of Water