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Ingersoll-Rand Compressor, how much hp required?


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Old 06-05-2018, 05:41:39 PM
DustyBar DustyBar is offline
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Default Ingersoll-Rand Compressor, how much hp required?

Our engine club has been given a large Ingersoll-Rand compressor. Just curious how much horsepower is needed to drive it at rated output? Ingersoll-Rand, model 25, two stage, three cylinder. Pulley has 5 v-belt grooves.
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Old 06-05-2018, 06:18:34 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Ingersoll-Rand compressor, how much hp required?

depends on what you intend to drive it with. Electric motor - I would thing around 5 HP or better if you intend to use at full pressure (100 PSI). if you intend to use a gas engine, at again full pressure, I would think15 to 20 HP minimum. You have to remember, an electric motor has constant drive motion, unlike a gas engine that only puts out power for a 1/4 of its 2 revolutions (power stroke) unless it is a multi cylinder engine. As for using a hit and miss engine to power it - by the time you get done with the reduction in speed, a 6 or 7 HP engine will be laboring pretty hard to keep up with the load, and it will take a long time to fill a reservoir at full pressure. From the looks of it, this is not a multi stage compressor, no? All cylinders the same size from the looks of the cylinder mounts?
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Old 06-05-2018, 06:51:44 PM
dalmatiangirl61 dalmatiangirl61 is offline
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Default Re: Ingersoll-Rand compressor, how much hp required?

Andrew
Read the tag! I'm thinking its going to take more than 5hp electric, my guess is minimum 20hp. I'm sure somebody can do the math and get better than a guess.
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Old 06-05-2018, 06:56:51 PM
Vanman Vanman is offline
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Default Re: Ingersoll-Rand compressor, how much hp required?

Yeah, that's a big beast of a compressor. I was thinking that the model 25 might be about right- 25 hp.
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Old 06-05-2018, 10:34:55 PM
K-Tron K-Tron is offline
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Default Re: Ingersoll-Rand compressor, how much hp required?

In that condition, a 5 horsepower motor will be more than sufficient.

My friend has a T25 in his workshop with a 10 horsepower general electric repulsion start induction run motor belted to it. The compressor does not turn very fast, maybe 350rpm, so he can get away with the smaller motor. I would tend to agree that a 20-25 horsepower motor would be necessary to turn that compressor at speed based on those cylinder dimensions. Do you have the rest of the compressor? The T25 was one of the last good compressors Ingersoll Rand built. They were made in the good ole USA. Now if you buy an IR no matter the price it will be made in China. No thanks!

Chris
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Old 06-05-2018, 10:49:03 PM
s100 s100 is offline
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Default Re: Ingersoll-Rand compressor, how much hp required?

Agreed on the 20 - 25HP. That's a big compressor with TWO primary cylinders feeding the second stage. I suspect the 100 psi referenced on the tag is the interstage pressure not the final output pressure.
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Old 06-05-2018, 11:31:32 PM
Vanman Vanman is offline
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Default Re: Ingersoll-Rand compressor, how much hp required?

Chris, PLEASE post photos of your friend's GE Motor and compressor!

Quote:
Originally Posted by K-Tron View Post
In that condition, a 5 horsepower motor will be more than sufficient.

My friend has a T25 in his workshop with a 10 horsepower general electric repulsion start induction run motor belted to it. The compressor does not turn very fast, maybe 350rpm, so he can get away with the smaller motor. I would tend to agree that a 20-25 horsepower motor would be necessary to turn that compressor at speed based on those cylinder dimensions. Do you have the rest of the compressor? The T25 was one of the last good compressors Ingersoll Rand built. They were made in the good ole USA. Now if you buy an IR no matter the price it will be made in China. No thanks!

Chris
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Old 06-06-2018, 04:39:13 AM
Merv C Merv C is offline
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Default Re: Ingersoll-Rand compressor, how much hp required?

I have a T30, 150 psi, American build, in the workshop that I have had for at least 30 years. It has a 5.5 kilowatt electric motor, that is almost 7.4 electric horse power.

It is a two stage compressor and dumps pressure from the cylinder when the motor shuts off so it can start up with with no residual air pressure.
I don't remember the rated free air delivery. It is either 25 or 35 cubic feet per minute, but it would handle everything we threw at it. including spray painting and my sand blaster.

If it is set up the same as mine a 7 or 8 hp motor would easily handle it.

Merv.
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Old 06-06-2018, 08:49:13 AM
DavidRaines DavidRaines is offline
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Default Re: Ingersoll-Rand Compressor, how much hp required?

Would anyone have an idea of how much this compressor would weigh?
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Old 06-06-2018, 09:43:09 AM
Glenn Gieszler Glenn Gieszler is offline
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Default Re: Ingersoll-Rand Compressor, how much hp required?

It is from the 1940ís I do not have the weight, the 30 series replaced it, I would imagine that the rated house power given would be for the max pressure and if you are operating it at less pressure that the hp requirements will be less
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