Variable Speed Motor Driven Compressor

[ghoshtathagata2000]

Hi Everyone,

That the trip speeds for the steam turbines, gas turbines, constant speed motors are defined in the API 617 standard for centrifugal compressors; this parameter is nowhere defined for VFD motor driven centrifugal compressors.

Can anyone please suggest what values in relation to the max. operating speed (100% speed) shall be assumed for the maximum continuous speed and trip speed for such VFD motor driven compressors.

Thanks.

 

[gurmeet2003]

Trip speed only needs to be defined when there is a possibility of run away condition. I am not sure that a VFD is subject to a runaway condition. VFDs are highly programmable and one can define trips based on so many different conditions.

Gurmeet
Time is an illusion. Now is the only thing there is.

 

[dcasto]

the vfd can put out fequencies higher than their input frequency, so you need to program the PLC output frequency to match the compressors rated max RPM.