The issue of pressure testing workpiece pipelines not being suitable for gear pumps
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That’s right; for pressure testing in the factory, gear pumps have always been used, with water plus emulsified oil as the medium. We know that hydraulic oil should be used instead, but one reason is that there is some loss during pressure testing (sometimes, due to design reasons, it’s not possible to completely remove the medium from the workpieces, leaving a small amount behind). Another reason is that the pipes are ultimately used for conveying heat transfer oil, and since the emulsified oil will dry up, there’s no risk of problems arising from that aspect. We need the pressure to reach around 1 Mpa. Are there any good gear pump recommendations? There’s no need to worry about the gear pump being damaged due to insufficient lubrication, thank you!
It is recommended to use a piston pump. First, fill the pipeline to be pressure-tested with tap water, and then increase the pressure using a plunger pump. In this way, the water can be completely drained and dried, without any effect on the subsequent heat transfer oil.