Air Hose
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Air Hose
I was wondering if there is a maximum length of Air Hose you can use before the pressure drop/air flow decrease becomes a problem. I want to use 3/8 ID (10 mm) hose. Can i use 200 feet or should i stick to shorter lenghts? Any help would be appreciated
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From: Kiefer, Northeastern Okla
Depends on several things- how big is the compressor, what is it being used for (impact or air ratchet vs. occasional shot-term use), and how often are you going to roll up your hose? Several shorter lengths are easier to handle than one long one. The biggest factor is your compressor's capacity (volume). How often are you going to need the whole 200 feet?
Posting Legend
Joined: Sep 2001
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Sorry I do not have figures for 3/8" ID line.
Pressure drop per 25 feet of air hose, proportional for longer or shorter lengths:
1/2" ID
Initial pressure: 80PSI/100PSI
20 SCFM: 0.9/0.7PSI
30 SCFM: 2.8/2.3PSI
40 SCFM: 6.0/8.4PSI
3/4" ID
Initial pressure: 80PSI/100PSI
20 SCFM: 0.2/0.2PSI
30 SCFM: 0.5/0.4PSI
40 SCFM: 0.8/0.6PSI
-From the trade standards adopted by the Compressed Air Institute
It would be best to pick up one length of 1/2" line and another of 3/8" line. Use the larger line off the tank first.
Pressure drop per 25 feet of air hose, proportional for longer or shorter lengths:
1/2" ID
Initial pressure: 80PSI/100PSI
20 SCFM: 0.9/0.7PSI
30 SCFM: 2.8/2.3PSI
40 SCFM: 6.0/8.4PSI
3/4" ID
Initial pressure: 80PSI/100PSI
20 SCFM: 0.2/0.2PSI
30 SCFM: 0.5/0.4PSI
40 SCFM: 0.8/0.6PSI
-From the trade standards adopted by the Compressed Air Institute
It would be best to pick up one length of 1/2" line and another of 3/8" line. Use the larger line off the tank first.
Posting Guru
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Posts: 1,616
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From: Sapulpa OK
The deciding factor in this issue is the amount of air the tool consumes. The air in the hose, when the tool is off, is static. When you operate the tool then the hose has to conduct enough air to keep up with the tool. If it cannot supply enough volumn of air then the pressure drops. An easy way to find this out is to install a temporary air pressure gauge right at the tool handle. Operate the tool and observe the gauge. If it drops below the minimum pressure required by the tool then increase the pressure switch, if you can, to compensate. if you cannot compensate with increasing pressure then you will have to go to a larger hose. Another way to resolve this issue is to install another receiver out at the work area, connected by the long hose to your air compressor, and then use a shorter hose to connect your tool to the auxilliary receiver. This will provide power untill the aux. receiver is consumed.
Posting Legend
Joined: Sep 2001
Posts: 30,255
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Fixnair that remote receiver method works well. I built one of the remote receiver systems a number of years ago for a friend. They do give a user brief periods of full power operation in between waiting for the receiver to recharge. It can make the difference on a stubborn fastener.
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