We have a compressor mounted on top of it's own receiver. The compressor
itself consists of two single phase compressors feeding into a receiver. The
single compressors operate on a duty/assist/standby mode of operation.
Problem, the compressors are undersized for the duty and are pretty much
We are considering installing a third larger compressor and plumbing it into
the same air receiver. The larger compressor will then become the duty unit.
The smaller ones will remain in situ but switched off. These would be used
as a back up should the large compressor fail.
I am also considering electrically interlocking the larger unit with the
smaller unit, so that the large compressor can only be run when the small
compressors are off.
Does anyone envisage any problems with operating the compressors this way,
and having three compressors into the same receiver.
Nope, sounds all ok to me! Are we talking single / 3 phase units?? I would
suggest you go for a low revving belt drive unit with unloader valve and
star delta starter (assuming 3 phase) for minimal surge during start up.
Have a think about the CFM of the proposed larger unit , and the size of
your existing receiver- it may be that you ought to install another receiver
in parallel if your planning on going with a "huge totally OTT" compressor,
else it will be cycling too often, which really reduces the life of the
Existing receiver has two single phase units mounted on top. They operate
duty/assist/standby. They will only be required as standby when we install
the new compressor.
The new one is three phase, star/delta start and is a screw compressor.
Is there any problem with having different types of compressor on the same
air receiver, eg. screw, piston, vane.
There will be no air isolation between the receiver and the existing
compressors, only electrical isolation.
In effect we will be pressurising the receiver and the high pressure air end
of the existing compressors from the new compressor.
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