Motor Overloading

Dear Chong

Motor Overloading when valve fully open
Check the performance curve and see if the Impeller diameter and Motor Kw
is in order .Otherwise trim the impeller to correct diameter ,bearing in mind that it must meet your duty
point required

When replacing a different size of pump, be sure to compare the duty point of both the pumps
Otherwise , you may have an oversized or undersized problem

When Increasing the capacity of pump . re calculate the delivery head
See earlier posting on this matter

Upgrading of Pumps

Very often when upgrading of pump to higher capacity .the piping system is not taken into consideration . Higher capacity for the same piping diameter would mean greater system pressure
If the piping length is very long . the system pressure should be recalculated to determine the new pumping head before selecting the pump .Suction line,the NPSH avialable must also be looked into

Otherwise .the new pump is not likely to perform as rated