Pneumatic test issues
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For refrigeration systems, refrigerant Freon, and the piping equipment between refrigerators and evaporative coolers, manufacturers say that hydraulic testing cannot be used, as it is not possible to ensure that all water in the pipes is completely removed. If there is residual water, it will enter the system along with the Freon liquid and condense into ice on the low-pressure side of the unit, thereby blocking the equipment. Therefore, a pneumatic test is employed, with an operating pressure of 1.9 MPa, a design pressure of 2 MPa, and a test pressure of 2.3 MPa. I have reviewed all the relevant standards; pneumatic testing is permissible at pressures below 0.6 MPa, and there are alternative methods available in cases where pneumatic or hydraulic testing is not suitable. But the leader still chooses to go with air pressure; I would like to seek advice from those who are more experienced
In some cases, nitrogen is also used for pressure testing!
Then you need to add a desiccator to measure the dew point. . . The air contains moisture. . .
If the pipe isn’t very large, add a pressure gauge~~ Buy some nitrogen cylinders and use them to fill the pipe and test the pressure~~ Of course, compressed air with a suitable dew point will also work~~