Both hydraulic and air pressure testing are undertaken at our Bristol facility.
The hydraulic tests are generally used to confirm the strength of a component but may also be used for detecting leakage on components subject to high working pressures
The air test is used for detecting various forms of leakage that might be caused by porosity or improper mating between components.
Air is used for pressures up to 100 kPa except for steel tubes up to 40mm diameter whereair can be used up to 35 kPa. The component is immersed in water prior to the pressure being applied and then the rate of leakage, if any, can be easily determined.
Hydraulic – Is used for pressures above 100kPa. The test will usually involve oil, paraffin water or a mixture of soluble oil and water. The temperature of test media may vary between 15 and 65 Degree Celsius.
Pressure test sequence and precautions:
Where both hydraulic and air testing is specified, the hydraulic test is normally carried out first, but the alternative sequence is also acceptable in some circumstances.
In all hydraulic tests it is essential that all air be expelled from the component under test. The test adaptors or blanks are therefore fitted with bleed screws to facilitate the removal of any trapped air.