on the tape
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If a vacuum cannot be achieved, all flanges should be taped up and checked for leaks by creating pinholes in the tape and spraying soap solution into those holes. This test must be carried out at a pressure lower than atmospheric pressure. What does “in the tape” mean here? It is part of the procedures for conducting a vacuum test. :L
Is the tape Teflon or some other type of tape used for sealing?
I’m not sure where the problem lies with yours? If a vacuum cannot be achieved, all flanges should be sealed with tape, and leaks should be checked by creating pinholes in the tape and spraying soap solution into those holes. This test must be carried out at a pressure lower than atmospheric pressure. When a vacuum cannot be obtained, seal all flanges with tape to check for any leaks. Pierce some holes in the tape and sprinkle some soapy water on those holes. This experiment must be conducted under conditions of lower than atmospheric pressure.
Make sure to translate “and”. Actually, there is a sequence involved here.