The pump that installed to transfer liquid from tank to tanker seems facing a problem. The motor that installed to the pump initially tripped due to high amp. First, the motor that install to the pump is small then I increase the motor size but the suction valve cannot fully open. Even though it cannot fully open, I get the flowrate that required. The pump curve can refer to attachment.
Pipe size : SS304 SCH 10 4 inch
Flow required : 80m3/h
Head : 30 m
Pipe length : 80m horizontal, 6m vertical
Motor : 50Hz 415V 2 poles 2900 RPM 7.5kW
Valve inlet and outlet opening : 1/4
Motor : 50Hz 415V 2 poles 2900 RPM 11kW
Valve inlet and outlet opening : 1/2
**Someone said that cannot open it full as the amp will increase.
I know it is a bit funny to install 7.5kW but I accept that stupidity that I made. I think it is not ok to open at half for the suction valve. I have propose few suggestion to this problem. First to trim the impeller to 160mm diameter. Second, to increase the motor to 15kW. But I don't recommend the second option as it will increase the power consumption and velocity inside the pipe. Hope you guys can share experience and suggestion. If you need another info, I will reply to it. Thank you in advance.