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Participant

Join Date: May 2007
Posts: 3

# Compressed Air Loss

05/24/2007 10:31 AM

I'm trying to calculate the amount of compressed air used by some tools in my facility, we're considering replacing them if it will save enough air to get rid of one compressor.

The tools consist of a 6-ft flexible tube to a 1-ft metal tube, each a 1/4-in in diameter. My compressed air system maintains about 105psi. The tubes have no nozzle, they just open flow for about 8hrs a day.

Can anyone give me some help finding the pressure drop and flow on these?

Pathfinder Tags: air flow compressed air
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Power-User

Join Date: Jun 2006
Location: Central America
Posts: 227
#1

### Re: Compressed Air Loss

05/24/2007 9:58 PM

I have here a table from Ingersoll-Rand.

@ 100 psig 104 is the discharge in cubic feet per of free air per minute through an orifice 1/4" in diameter.

Guru

Join Date: Apr 2007
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#2

### Re: Compressed Air Loss

05/24/2007 10:43 PM

Hi Coffeebean,

I just looked up an Ingersol-Rand IR3445 angle grinder. 8hp, 12,000 RPM and it only draws 9 CFM. Most of these tools are designed to run at 90 PSI.

Is 104 CFM correct? Just doesn't sound right.

John

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Power-User

Join Date: Jun 2006
Location: Central America
Posts: 227
#3

### Re: Compressed Air Loss

05/24/2007 11:55 PM

Thanks for bringing that up. Your´re right. 104 cfm can´t be right for an air tool.

104 cfm is for flow discharging through and 1/4" orifice.

Power-User

Join Date: Dec 2006
Location: Bolingbrook Illinois, a southwest suburb of Chicago.
Posts: 367
#4

### Re: Compressed Air Loss

05/25/2007 1:18 AM

I don't know what you are using the air for. It sounds like probably cooling? Or prevention of fume accumulation? If that's the case, a simple vacuum cleaner type centrifugal fan putting out 2 psi could supply the same air quantity through a 2 inch hose.

RichH

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Guru

Join Date: Jan 2006
Location: Tamworth, UK.
Posts: 1781
#5

### Re: Compressed Air Loss

05/25/2007 5:00 AM

It would help to know what the tools are and what you need the air for.

A 1/4" tube, at 105 psi, could discharge 108 cfm to atmosphere. But somewhat less due to pressure loss down the pipe. And do you have some form of flow control in the pipe.

I am off for a week-end break. I can't respond until 29th May.

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Anonymous Poster
#6

### Re: Compressed Air Loss

05/25/2007 8:55 AM

There's a lot of data about air line pressure drop, and air consumption figures at www.about-air-compressors.com. This is the page that contains info: http://www.about-air-compressors.com/Compressor-sizing.html

Good luck.

Bill

Participant

Join Date: May 2007
Posts: 3
#7

### Re: Compressed Air Loss

05/25/2007 9:50 AM

Thanks all, I'm definitely closer to the information I need.

There actually is not any control on the tool end, its a tremendous waste of air (and energy). The blowers are being used to clear small debris from, and to a lesser extent to cool, a large metal-stamping machine. They turn on whenever the machine is operating, generally about 30-45min at a time with 15-20 minute changeovers for two shifts.

The whole system was implemented before my time and we're now looking to replace it with a low-power electric fan or sweep that would do the job just as well.

Participant

Join Date: Oct 2007
Posts: 1
#8

### Re: Compressed Air Loss

10/03/2007 4:18 AM

Another website on compressed air http://www.compressedairchallenge.org/ under the library / fact sheets tab you will be able to find solutions to compressed air losses.

I have been working with customer on energy conservation for compressed air and if you are interested to know more on how we do energy conservation for compressed air please drop me a mail @ clifton.chia@cpf-cejn.com.sg

Member

Join Date: Mar 2007
Location: The Netherlands
Posts: 9
#9

### Re: Compressed Air Loss

11/01/2007 5:34 AM

If you want to know your actual compressed air consumption and if you want to see the results of your savings campaign, you should consider to install flow meters.

With a 3-in one compressed air flow meter, you can see flow, pressure and temperature. This is like having a multimeter for Voltage and Current. This tool can reveal consumption and related pressure loss in your system.