Twin Lobe Blower taking Extra Amp Problem

[Jack Johnson]

So we do have Twin Lobe Blower and having 50HP motor to run it.
The Problem we are facing is taking extra amp compare to other blower(same model) and same Motor Capacity. So the first thing I did was changing motor to new motor(50HP) but still taking same amp (62 Amp) and other blowers were taking around (51-52 amp max)
After that I dismantled discharge line and took reading (no load- it was taking 30amp)
But after fitting discharge line it was still taking 63 amp. Help me with this problem

 

[LittleInch]

Different inlet and outlet pressures?

Wear in the blower?

No load taking 50% of the max power seems odd.

Any other data like blower performer curves? Motor data sheet? Inlet and outlet pressures?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Compositepro]

Wear in blower may be causing more slippage (leak past the lobes from outlet back to inlet).

 

[pierreick]

HI,
Clean the discharge line.
Pierre

 

[georgeverghese]

What about discharge temp - this blower compared with the other blowers ?
Can you post PID ? What is the service fluid for these blowers - description.

 

[pmover]

are blowers in parallel operation with equal resistances in piping?

if parallel operation, and pipe resistances/lengths to common outlet pipe are not the same, the motor with greater resistance may need the additional amps to overcome the increase head.

 

[JJPellin]

Bearing failure or bearing wear causing internal rubs on end wall. Fouling caused by inlet filter failure.

Johnny Pellin

 

[LittleInch]

JJP,

Where have you been?

You've been missed off these pages...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Strong]

In addition to the mechanical fault issues mentioned, consider suction pressure. Blower load and motor current are are affected by both suction and discharge pressures. Check suction for blockage, such as air/intake filter or other upstream issues.

Walt