KK
If the pump is not producing sufficient vacuum. the possiblities are
a) The pump is too small , but if you replacing other pump with the same rating ,then this should not be the problem
b) The flow of the the service liquid is too low , increased the flow of service water to twice the rated value
c) Temperature of service liquid is high ( not so likely in palm oil mill )
d) Air leakage in the system
e) Leakage in Mechanical seal
f) Internal Corrosion , but if new pump then this is unlikely
Checking your pump rating and confirm if is correct
If correct rating .focus on (b) to ( e )
Other mechanical fault , clearance between impeller and plate , or casing
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