Why 3 kilograms for the replacement?
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Whether nitrogen or hydrogen is used in the device, 3 kilograms are used for displacement – why? Is it to save time and nitrogen? Solve
There’s no such thing. It’s either a problem with the pressure in the relevant pipelines, or it’s someone’s *habit.
Even high pressure is fine; the replacement process is faster at high pressure than at low pressure.
There aren’t any strict requirements for this; the level of pressure doesn’t matter.
Normally, for standard displacement, we use 0.1 MPa to carry out the displacement three times; this depends on individual operating habits or the factory’s regulations
Check if the pipeline network pressure is this value