Air compressor 200hp

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dm9289

Industrial Maintenance Electrician
Location
Pennsylvania
Occupation
Industrial process repair/ maintenance Electrician
We had a 100hp air compressor that went boom, contractor miss phased on plant outage.

We are considering a 200hp replacement we would have to rewire.

Should I simply size by 125% compressor name plate. Like a 430.22 single motor

Or do a multi motor calc for example 125% of 200hp motor + 100% of fan motor +100% of associated electronic for control boards

Thanks in advance
 
hillbilly1 said:
With that large of a compressor, the manufacturer should be able to give you some guidance on the ocp. It probably has a soft start or reduced voltage starter.
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I think it’s going to be a star delta. We are scrambling for availability
 
hillbilly1 said:
With that large of a compressor, the manufacturer should be able to give you some guidance on the ocp. It probably has a soft start or reduced voltage starter.
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I would think so.

I would also think that an air compressor of that size would come as a packaged unit with it's own OCPD/Disconnect already installed to hit with a feeder.

JAP>
 
jap said:
I would think so.

I would also think that an air compressor of that size would come as a packaged unit with it's own OCPD/Disconnect already installed to hit with a feeder.

JAP>
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Agree....most, if not all, of the large compressors I dealt with had a factory specified main overcurrent device...often fusible.
 
jap said:
I would think so.

I would also think that an air compressor of that size would come as a packaged unit with it's own OCPD/Disconnect already installed to hit with a feeder.

JAP>
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Yes it does hav OCPD but we will need to run new branch circuit to disconnect on wall before compressor then whip to compressor. Just scrambling to get a rough bill for install materials. Our plant has 2 compressor one is supplemental and runs about 30% of time. When we find a compressor available we will have to move very quickly. If we replace with 100hp no problem so far 200hp only one available instantly
 
dm9289 said:
We had a 100hp air compressor that went boom, contractor miss phased on plant outage.

We are considering a 200hp replacement we would have to rewire.

Should I simply size by 125% compressor name plate. Like a 430.22 single motor

Or do a multi motor calc for example 125% of 200hp motor + 100% of fan motor +100% of associated electronic for control boards

Thanks in advance
Click to expand...
Hopefully the new one will have phase loss/reversal protection built in.
 
dm9289 said:
Yes it does hav OCPD but we will need to run new branch circuit to disconnect on wall before compressor then whip to compressor. Just scrambling to get a rough bill for install materials. Our plant has 2 compressor one is supplemental and runs about 30% of time. When we find a compressor available we will have to move very quickly. If we replace with 100hp no problem so far 200hp only one available instantly
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You need the particulars on whatever it is that you are getting.

Generally on a compressor of that size they are self contained and you would be hitting a single point OCPD/Disconnect.

I'd find out what that is and prepare for that.

JAP>
 
jap said:
You need the particulars on whatever it is that you are getting.

Generally on a compressor of that size they are self contained and you would be hitting a single point OCPD/Disconnect.

I'd find out what that is and prepare for that.

JAP>
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For screw compressors, it’s not uncommon for the cooling module to be separate from the compressor itself. Very useful when the application includes heat recovery.
 
retirede said:
For screw compressors, it’s not uncommon for the cooling module to be separate from the compressor itself. Very useful when the application includes heat recovery.
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Agreed, but, all the advice in the world is not going to help him if it doesn't relate to what's actually going to show up.

Which we don't know.

JAP>
 
Thank you for all your replies to an open ended question with many what ifs. It looks like we may have found a direct replacement one state away fingers crossed
 
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