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Gas to electric compressor

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Paul

06-30-1999 04:51:15




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I just bought a 12HP gas engine powered air compressor. I want to remove the gas engine and install an electric motor. My question is how many horsepower motor do I need to use and do I need to use a capacitor start motor or any other
starting switch. The compressor is a 2 stage 2 cylinder unit. Any help would be appreciated.




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Rick K

07-12-1999 07:38:09




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 Re: Gas to electric compressor in reply to Paul, 06-30-1999 04:51:15  
If the gas motor is still good, how about if you just sell the whole thing and buying a complete electric one? Seems like the cost and aggrivation of making the swap would make it more cost effective to go that route instead. Landscapers use gas powered ones up here in the north for blowing out sprinkler systems in the fall so they don't freeze, so that may be an outlet to make your old one go away.

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Ernie

07-06-1999 18:43:44




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 Re: Gas to electric compressor in reply to Paul, 06-30-1999 04:51:15  
For a direct replacement the rule of thumb is 2 gas hp = 1 electric hp. To be safe measure the amp draw at highest load, do not exceed 80-85% of name plate draw. Do not skimp on wire size, measure volts while you are at the amp draw.

The advice on hiring an electrician is very good. An overloaded motor can burn a shop down....



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Vince

07-01-1999 15:18:00




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 Re: Gas to electric compressor in reply to Paul, 06-30-1999 04:51:15  
Paul, I agree with the second Paul. Depending on your demand for air, the 5 hp electric motor idea would probably work at a decreased level of performance. To match the work of the 12 hp gas would take a pretty big electric motor, probably 3 phase power too. (I guess you do not have the option to keep using the gas engine by venting the exhaust outside of the building.) If you can get your hands on a W.W. Grainger catalog, I think they have conversions in the back for coverting gas to electric, hydraulic, etc. They are also a good source of motors, compressors and related industrial items. Sorry I did not specifically answer your question, just my $0.02 Good Luck.

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Paul

06-30-1999 18:26:25




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 Re: Gas to electric compressor in reply to Paul, 06-30-1999 04:51:15  
I'm sure someone knows a lot more than me, so maybe they'll help out. Alot depends on your intended use for it, you can just use a 5HP and a small shieve on the motor. If you only have single phase power you should get something like a Baldor (quality) motor with high temp insulation. I would get a motor "starter". That's a magnetic operated contactor with overload protection, properly sized for motor, then add a separate pressure switch, Furnace makes them, less than $20 where I am. If compressor is used a lot go with a NEMA rated starter, Allen-Bradley makes good ones, costs money though for something that good. If you can contact compressor manufacturer, they may help with motor/shieve size etc. Make sure everything is grounded PROPERLY.You need much more info than what I just told you. A LITTLE electrical knowledge can be very dangerous. If you don't hire a knowledgeable professional electrician to wire it atleast post for info at Newtons Electrical Resource Board >Link

Paul

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