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Negative pressure equal to vapor pressure developing at pump suction head readings only found in extreme pressure report

Dear All,

I am working on hammer bentley version and whenever i generate the extreme pressures report, i get negative pressure equal to vapor pressure at the pump suction side. Is this normal, and if so, is there a means to eliminate such negative pressure on the suction side. or this is something that is a glitch in the software and should be disregarded.

Please advise