GrimesFrank
Mechanical
- Sep 11, 2006
- 149
Forgive the ignorance, this may be a simple look-up/calcultion.
My operators want to run a test where they want to run every configuration of a (2) sets of 2 pumps to determine flow/dP characteristics of the system. They will do thi by of their normal 'swap duty' procedure. Each pump is nominally identical; 40HP 2-speed induction motors. At any one time (2) pumps will be energized. The pumps will either both be in low speed or high speed.
Sequence;
P1A & P1B
P1B & P2A
P2A & P2B
P2B & P1A
When you select P1A off, P2A auto starts on pressure decay, etc.
How long should I make sequence take (i.e. time between duty changes) to avoid overheating the windings on P1A? This sequence wants to be repeated a couple of times.
As of this moment I don't have FLA of the motors yet so what I'm looking for is; teach me how to fish in lieu of feeding me salmon please.
Today is gone. Today was fun.
Tomorrow is another one.
Every day, from here to there,
funny things are everywhere. ~'Dr.' Theodor Geisel
My operators want to run a test where they want to run every configuration of a (2) sets of 2 pumps to determine flow/dP characteristics of the system. They will do thi by of their normal 'swap duty' procedure. Each pump is nominally identical; 40HP 2-speed induction motors. At any one time (2) pumps will be energized. The pumps will either both be in low speed or high speed.
Sequence;
P1A & P1B
P1B & P2A
P2A & P2B
P2B & P1A
When you select P1A off, P2A auto starts on pressure decay, etc.
How long should I make sequence take (i.e. time between duty changes) to avoid overheating the windings on P1A? This sequence wants to be repeated a couple of times.
As of this moment I don't have FLA of the motors yet so what I'm looking for is; teach me how to fish in lieu of feeding me salmon please.
Today is gone. Today was fun.
Tomorrow is another one.
Every day, from here to there,
funny things are everywhere. ~'Dr.' Theodor Geisel
