INGERSOLL RAND SSR-EP15 big enough?

I am looking to buy a compressor for my heavy truck repair shop, we will run a 1" and 3/4" impact guns. I am looking at an IR INGERSOLL RAND SSR-EP15 15 hp model 53 CFM @ 128 psi runs on 208-230/460 3 phase, screw type. It doesnt have an air tank, would I need one with that much CFM? both tools running at once would require about 25CFM max

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See the Sizing page for help on sizing an air compressor.

You will typically get about 4 CFM of compressed air at 90 PSI for each HP of compressor motor size, so this compressor might actually be bigger than you need for just these two tools. Typically, also, compressed air use always grows so over sizing up front might not hurt.

This is a "demand" type air compressor I believe, meaning that it will run unloaded while you are not using air and run loaded (compressing air) while you need air.

If the compressor is not sound shielded, that might be an issue.

Cheers,

Bill

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Jun 12, 2014
Air compressor 15 HP rotary screw
by: UV Inc

I have a masters in engineering.

The compressor size depends upon the rating of the guns used and the c.f.m. used by them. Also you have to factor the number of cycles per minute.

It is always recommended to buy a compressor with a little safety factor.

2.0 You must add the following with a 15 HP compressor:
One vertical storage tank - enough to store the required air for a few minutes so you do not see any pulsations. The tank should be connected to a good air refrigeration system to get rid of all the moisture.
A good complete system slightly used ( say about 1 5000 hours can be procured form 6000 to 8000 dollars.

Please post your contact information here if you want me to help you.
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UV Inc., I would argue that it isn't the extra tank that takes pulsations out of the air supply to the air tool, but rather, having the supply air regulated to a point where the air compressor kicking in and out doesn't affect the flow.

Bill



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Ingersoll-Rand U25HE-SP 25 HP rotary screw compressor won't build pressure

by Nate
(Alabama)

My plant's primary compressor as stated above will not build up pressure past 40-50 psi.

After running thru the tips you have on your site about compressors not building pressure, i found that the compressor doesn't have leaks, the intake valve isn't suspect, and the unloader valve or what i believe to be the unloader valve isn't bad.

The housing on the rotary screws does get warm to the touch after a few moments of operation, i don't know if that would be a factor or not. I can't get ahold of a manual on the unit and just being out of college and flying by the seat of my pants here any information you could give me would be a huge help. Thanks
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My first thought is, is there sufficient oil in the air end? Otherwise, we'll have to rely on an I/R skilled visitor to add their insight.

Cheers,

Bill

Comments for Ingersoll-Rand U25HE-SP 25 HP rotary screw compressor won't build pressure

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Mar 13, 2012
Reply to Bill
by: Nate

The oil sight gauge is within the correct limits. The employees here say that this compressor worked not too long ago, but that was probably about 4 months ago or so before I started working here. I have never worked on a compressor of this type or size before, so I'm trying to find out everything I can about this unit before i try to open the housing to the rotary screws and check the gears.

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My IR compressor kept running

My compresor Ingersoll model ss5l5 ran 60 gallon 5 hp 230 volt single phase 1 year light use was left on!

I ran into my garage frantically after my neighbor told me of sounds coming from the garage, .

The compressor could have been left on for 9 hours upon entering there was smoke and the motor sounded like a dirtbike!

I turned the ON/auto switch to the off position and it kept running my friend says the relay was burnt out and left it running I flip the breaker to turn it off now I am waiting for it to cool if the motor is still good where can i get an Ingersoll rand ss5l5 relay?

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Bill says...

First off "tohype4u2", why did it keep running? Did you have an open air line bleeding air off the tank so that the compressor didn't ever get up to cut out pressure?

If no air bleed off, then you need to replace your pressure switch.

As to the parts, did you contact IR? Start here:
http://company.ingersollrand.com/Pages/default.aspx

Cheers,

Bill

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10 hp IR won't kick over/turn on. Pressure drop at hose reel 80' from unit.

by Bill Ernst
(Sonoma County)

Hi,
I live in Northern California and have a 10hp IR horizontal 80 gallon compressor, probably twenty-five years old, custom mounted in the floor of my barn.

It draws 40+ amps -- on a double 50 breaker. About a year ago it started having trouble kicking over; humming, frozen. I would kick the breaker off, then back on several times to see if it would turn over and start up. It worked for a while. Now it won't.

Thinking about replacing the motor with something much smaller; 3 to 5 horse, or 12 cfms @ 90 to 110 lbs is all I really need.

Electricity wouldn't be such a concern if I leave it on, etc. I know the compressor would have to match the motor. But what else do you think is a concern? The tank in the floor is great for space. The new horizontal units are pretty spendy...

Also, I plumbed-in around 140 feet of 3/4" iron pipe to two outside valve locations for air. Is this added air space a problem for delivery? It seemed that after this plumbing the compressor would drop off in pressure and volume real quick.
Appreciate your feedback.

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Bill says...

From what you are saying, and assuming that your pressure switch is passing, and allowing electricity to flow to your motor, my guess is you might have a start capacitor problem.

By adding that much pipe, what you've done, is created another air tank in your system, and yes, it will take longer for the compressor to recharge back up to cut out pressure.

I can see nothing wrong with that, but I suspect, in time, you'll have a rust and particle problem with the black pipe.

As to pressure drop, you will get some over that distance. The issue is what are you trying to run with the compressed air at the end of those runs? I don't see why you would be having a problem getting the CFM you note at that pressure, as long as the pressure going into the tank and lines is appreciable higher than that.

If you put 90 PSI into your system, you will likely not get 90 PSI out the other end of those runs. Check the pages on pressure drop linked from the nav bar.

Cheers,

Bill



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