Impact to frequent load/unload cycles on rotary screw air compressors?

[YungPlantEng]

Have two 100 HP rotary screw air compressors that modulate via loading/unloading. Last compressor analysis indicated very frequent load/unload cycles (maybe once a minute per compressor). This is because we don’t regulate pressure after the compressors and various processes use a lot of it.

Am I underrating the potential issues this causes? We deal with significant oil carryover but I wasn’t sure if the switch between loading/unloading would really impact that.

 

[goutam_freelance]

Do you have one or more adequately sized air receivers? If so, what is the capacity in minutes of flow?

 

[YungPlantEng]

1.5 minutes of max flow. I don’t think they’re inadequately sized but since the pressure isn’t reduced from compressor pressure we’re very susceptible to high use periods.

 

[LittleInch]

So what is your dead band on the compressors?

Can you increase it?