Leakage issue in the secondary testing of pump components
Thread Content
Before assembling the pump in the factory, the main components are pressurized to prevent defects. The problem now is that although the individual components pass the quality checks, there is still leakage during the static pressure test of the complete pump after assembly. This happens with both cast iron and cast steel. I’d like to ask everyone what’s going on here? How to control it? (The factory chose subpar suppliers in order to cut costs, and it also lacks capabilities in non-destructive testing.)
Are the pressing pressure values and holding time for the components the same as those for the entire machine? If the latter is low, it is likely that there is a leak due to pressure on the components, but this has not been detected
Can’t detect it through a hydrostatic test? Is the entire pump leaking?
Pump leakage is related to process issues; hidden causes include stress-induced deformation, casting defects such as sand holes, etc. Process-related problems involve poor flatness or roughness of the sealing surfaces.
There’s another thing: pumps with packing seals have **standards** that allow for some leakage.