The water jacket method gas cylinder hydrostatic trest machine is an automatic gas cylinder volumetric expansion deformation test system. It adopts the advanced water jacket method to perform gas cylinder hydrostatic test, so as to detect the volumetric deformation rate of the gas cylinder, thereby determining whether the gas cylinder is qualified and can continue to serve. The gas cylinder hydro test machine is applicable to diverse high-pressure gas cylinders, namely seamless gas cylinders, such as oxygen cylinders, CNG cylinders, hydrogen cylinders, SCUBA SCBA breathing tanks, Co2 fire extinguishers.
The water jacket gas cylinder test system is a more advanced gas cylinder external measurement test method. Compared with the direct expansion method, the water jacket testing method eliminates the interference of environmental factors during hydro test, thus more accurate in test results.
Specifically, there are two water jackets equipped with the gas cylinder hydrostatic test machine, one of which is specially for oxygen cylinder testing. Firstly of all, fill clean water into the gas cylinder to be tested. And then place the gas cylinder into the water jacket where is full of ordinary water. Next, inject high-pressure water at the required pressure into the gas cylinder. And then maintain the pressure. During the pressure maintenance period, the gas cylinder will expand and then squeeze some ordinary water in the water jacket into a measuring cup. And the gas cylinder will restore partially after pressure unloading, so a part of water in the measuring cup will return to the water jacket. So the remaining water in the measuring cup is the volumetric deformation of the gas cylinder. The machine will automatically record measurement data and calculate the gas cylinder volumetric deformation rate , thereby determining whether the cylinder is qualified or not. Generally speaking, if the volumetric deformation rate of a gas cylinder exceeds 10%, it cannot be used any longer and must be scrapped.
1. What is the gas cylinder hydrostatic test?
Gas cylinder hydrostatic test is essential in gas cylinder manufacturing and periodical inspection. It simulates a high-pressure environment by applying a given pressure of water into the gas cylinder to verify whether the structural integrity and tightness performance of the gas cylinder meet the design requirements, thus ensuring the safety of the gas cylinder during daily use.
2. How often to perform a hydrostatic test on gas cylinder?
Generally speaking, new gas cylinders are factory pressure tested prior to despatch. Gas cylinders in use and old gas cylinders require hydrostatically tested every two, three or five years. And it depends on the type of gas cylinder and the regulations in your country.
3.What are the methods or types of gas cylinder hydrostatic test?
The gas cylinder hydro test usually includes three test methods: Gas cylinder pressure resistance and burst test, Direct expansion method gas cylinder volumetric deformation test, and Water jacket method gas cylinder volumetric deformation test. For more information on the differences between these three tests and which test method is right for you, please refer to our blog post Three Types of Gas Cylinder Hydrostatic Test.
4. What is gas cylinder pressure burst test?
The purpose of the gas cylinder pressure test and burst test is to verify whether the gas cylinder material strength meets the design requirements. And the test is applicable to all types of cylinders.
5.What is gas cylinder hydrostatic deformation test? And which gas cylinders must be performed the hydrostatic deformation test?
The purpose of the gas cylinder hydrostatic deformation test is to detect and assess the deformation of gas cylinders, so as to determine whether the gas cylinder can continue to serve. Generally speaking, low-pressure gas cylinders and welded gas cylinders do not require the hydrostatic deformation test. However, the hydrostatic deformation test is mandatory for high-pressure gas cylinders and seamless gas cylinders, such as compressed gas cylinders, oxygen cylinders, and breathing cylinders.
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