Thank yoy first for answering
The spee dof the pump was Either 1800 RPM or 3000Rpm I will have to look it up The start was DOL but do not get me started on why we were seeing a 36% voltage drop. Bad engineering on power providers side.
Our cust specify that our pumps need to start under an 80% voltage condition so we size our motors acordingly. We manufacture Cryogenic pumps for the LNG market so we are talking submersible applications. We are starting to question the start torque curves provided to us by the manufacture...
This start current is normal even in the Area of around 7-8 Times FLA is common on very large pumps. We are testing a 1800Kw pump that at D.O.L. start requires 1400A start current
at 6300Volts, Back that out through the transformers to the tune of about 20,000 A at 450V at the gen's. If you run...
I have been told that the avreage start time for a large pump
should be in the range of 4-5 seconds. But thus far have been unable to backup this number with any data available. Is there a standard for start times 0-1800-0-3600 or an average that is shot for. On a Direct On Line start basis.
Can one calculate FLA or is that just a function of operation. In other words the pump is designed with design criteria being
Torque Speed / Eff and you get what you get within reason. Or is there a specific calculation.
