Does a screw pump have self-priming capability?
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The self-priming height is 2.5 meters; can a screw pump be used? Should a diaphragm pump still be chosen? What kind of pump is generally used as a self-priming pump in sludge applications?
Screw pumps have self-priming capability, so they can be used for handling sludge. There is also a ZW self-priming sewage pump available on the market, which might be suitable for your application as well.
The screw will do; your requirements make it easy to make a choice