The test medium:

 

Pressure testing should be dry nitrogen gas or clean, dry, oil-free air.

Pressure testing steps:

1) before the pressure test, owner and contractor to inspection on piping unfinished work and tags.

2) system from scratch pressure, when pressure reaches 1 barg or 10% of the test pressure to stop the pressure, and at this stage the holding not less than 10 minutes. Monitoring system on gauge change, such as pressure drop and found that funnelled, pressure relief to zero, for pipeline repair work.

3) will continue to step up to 25% of the test pressure to stop pressure, holding for 10 minutes.

4) continue to step up to 50% holding 15 minutes, such as pressure drop or funnelled, pressure to zero, for pipeline repair work. If no pressure drop, will be making preliminary leak detection system.

4) on the system pressure and 75% of test pressure, observe the change of the pressure gauge.

5) increased to 95% of the test pressure and pressure not less than 15 minutes.

6) when the pressure on this continue to step up pressure rate according to the pressure in the table below:

 

7) when the pressure reaches the test pressure to stop pressure, pressure maintaining 15 minutes to observe the pressure gauge on the pressure change.

8) and then down to pressure of work pressure, under the pressure in the pressure check joint, flange interface, and funnelled.

9) after the inspection, the pressure to rise again to the test pressure pressure after 5 minutes.

10) fell to work pressure, again to do secondary inspection line, found no leaks and other issues, should be marked and recorded, after pressure relief to 0, do the repair work.

After 11) strength test, the pressure will be 90% test pressure, bubble ready to do the experiment.

 

High pressure air compressor

Power 65 kw electric: 25 mpa pressure flow 3 nm3 / min

Diesel: 25 mpa pressure power 130 kw flow 7 nm3 / min