Specify 1- or 3-Phase Sprinkler Air Compressors?

10/12/2021

Do you specify single phase or 3-phase power for dry system air compressors?

If 3-phase, what horsepower?

I've always gone with single phase but I had a sprinkler contractor tell me recently that they prefer 3-phase compressors because they fill the system better and last longer. I was curious what others would recommend as better practice.

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9 Comments

Alex

10/12/2021 05:24:55 am

Hi Anonymous,

In my opinion, if you size the compressor correctly, it does not matter single or three phase. I typically coordinate this directly with the electrical engineer during design on what is available and easiest to bring to the room.

In terms of electrical engineering, he is correct that three phase is more efficient and provides greater power density but this does not effect the compressor if designed correctly.

I typically call for General Air Products to be installed. I recommend checking them out if you don’t have a compressor in mind.

Thanks,
Alex

Mike

10/12/2021 08:31:37 am

General Air is great. I think they are through Viking and will help you size the system based on its volume.

Jesse

10/12/2021 08:33:27 am

I agree with Alex. Sure, 3-phase is more efficient. But if the have the compressor sized correctly, its not doing a lot of work and single phase is sufficient.

We use a lot of C-Aire and General Air Products compressors and nitrogen gens.

David Kendrick

10/12/2021 08:46:58 am

A fire sprinkler system compressor should have a UL1450 listing.

Glenn Berger

10/12/2021 08:58:42 am

Single phase when part of preaction systems and smaller dry-pipe systems. Three phase for larger dry-pipe systems.

Brian Cockburn

10/13/2021 11:18:21 am

Thanks Glenn.

Where do you draw the line between 'small' and 'large' dry systems?

JON link

10/12/2021 10:18:49 am

Actually there are some considerations that you have to make when choosing a compressor, available Voltage, budget, system demand, product availability in your area. I agree on the comments above as long as compressor is size properly then you'll have no problem..

Matthew King

10/12/2021 01:32:37 pm

Typically, the total power requirement will drive 1 phase of 3 phase.

Lucas

10/13/2021 10:32:04 am

Above comments all provide good direction. I would add that if the correctly sized air compressor is a mid-sized model (1.5 or 2 hp) and you have the option of single phase or 3 phase I would go with 3 phase. It will be slightly more expensive for the electrician to run power, but compressor motor should last longer and be less likely to overheat.

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Specify 1- or 3-Phase Sprinkler Air Compressors?

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