The high pressure test is required for all kinds of sealed components and pressure vessels such as instruments, valves, joints, fire extinguishers, scuba tanks, pipelines, gas cylinders, vehicle brake lines, boilers, hoses. And it is designed to simulate a high-pressure environment through gas or liquid medium to verify the strength and sealing performance of the testing object. Normally, pressure testing includes tightness leak testing, hydrostatic testing, burst testing and fatigue testing.
Tightness Leak Test
The tightness leak testing, also known as air tightness testing or leak detection, is a pneumatic test. Normally, the tightness leak testing uses air, nitrogen or helium as test medium, and is to check whether there is leakage in the testing object. Generally, the testing pressure value is set to 1.15 times the design pressure. The tightness leak testing process is as follows. Firstly slowly rise testing pressure to the preset value, then turn off the pressure source to enter the pressure maintenance stage. After the pressure maintenance period, check whether the pressure-drop meets the relevant requirements or use bubbling method, so as to determine whether the tightness is qualified or not. Senwell provides you with manual and automatic pneumatic test equipment to facilitate you to conduct tightness leak test.
Hydrostatic Pressure Test
The hydrostatic testing, as know as hydro test or hydraulic pressure testing, is a non-destructive test. And it is aimed to verify the pressure resistance or strength of sealed components. Usually, the hydrostatic pressure testing utilizes water or hydraulic oil as test medium. And the testing pressure value is set to 1.25 times the design pressure, but not less than 0.6MPa. Firstly slowly rise the pressure to the preset pressure, then enter the pressure maintenance state. And then reduce the testing pressure to the design pressure of the sealed component. Subsequently enter the pressure maintenance phase again. After the pressure maintenance period, if the pressure-drop is within the allowable range, or the sealed component doesn’t crack or leak, it proves the hydrostatic test qualified.
Pressure Burst Test
The burst pressure testing is a destructive test. And its purpose is to seek the peak pressure at the moment of a sealed component cracks due to internal pressure. Considering the dangers of intermediate and high pressure gas, the liquid medium is more suitable for burst testing. Generally speaking, the burst testing comes after the hydrostatic testing completed. Constantly increase the testing pressure unit the pressure component cracks. At this moment, the pressure that causes the sealed component to crack is the burst pressure of the sealed component. Normally, if the burst pressure is higher than 1.4 times the design pressure of the sealed component, the sealed component is qualified. We supply manual and automatic burst pressure testers to provide users with convenient and safe operation.
