API 676 Tolerance for progressive cavity pumps 1

[itsmetinnie]

Can someone help explain what does Tolerance of +4% for the rated power in API 676 means?

I have a progressive cavity pump and based on the FAT report the absorbed power is 0.07 kW, the basis of tolerance is +4% of motor rated power based on API 676 (min = 0.07 and max = 0.15 kW)
The actual rated power of the motor is 1.1kW (based on the name plate). I am confused what does it mean for the absorbed power of 0.07 kW and how the min and max range was calculated.

 

[EdStainless]

What is the total power when the pump is working?
The 0.07kw absorbed is power loss due to internal friction.

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P.E. Metallurgy, consulting work welcomed

 

[itsmetinnie]

The available power at motor shaft at design temp is 0.82 kW, rated power of the motor is 1.1 kW. Please further explain the +4% tolerance per API 676 means.

 

[EdStainless]

Given your pressure, flow, and fluid properties what is the expected power required to pump?
This should come from the manufacturers data sheet.
And that number should be +/-4% of the actual.

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P.E. Metallurgy, consulting work welcomed

 

[LittleInch]

Eh?

You have a 1100 W motor to power a pump taking 150W.

Why?

The 4% is meaningless here.

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