Author Topic: Air Hose  (Read 3477 times)

Offline mooseman

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Re: Air Hose
« Reply #15 on: January 26, 2012, 06:07:24 AM »
this might be a resource for your work.

http://www.airheads.net/

technical section
http://www.airheads.net/tech/index.html


air flow through orifices...chart
http://www.airheads.net/tech/techinfo/airflow.html

mooseman
« Last Edit: January 26, 2012, 06:09:45 AM by mooseman »
DUE TO CIRCUMSTANCES COMPLETELY WITHIN MY CONTROL YOU SHOULD GET YOUR OWN TEE SHIRT AND A SHARPIE MARKER BY NOON TOMORROW OR SIMPLY CALL SOMEONE WHO GIVES A SHIRT.


Offline Gilligan

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Re: Air Hose
« Reply #16 on: January 26, 2012, 10:23:03 PM »
The bucket analogy still holds true.

Yes, you will be "fine" as far as running the press given your compressor can put out more air than you consume.

BUT, do you want your compressor to have to PUSH through the restriction or have it flow as easily as possible to your storage tanks?

In the bucket analogy it took longer... if it takes your compressor 25% more time to fill up your tank, it may keep your presses running without a hitch but that is also 25% more operating cost and 25% more wear and tear on the compressor.

All those numbers are just completely made up and these are just my thoughts on the issue. YMMV

Offline ScreenFoo

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Re: Air Hose
« Reply #17 on: January 27, 2012, 02:38:59 PM »
I have to wonder though--If it takes 25% more time to fill up your tank, how did you just change that 10HP into a 7.5?  Where's that extra energy going?

Wouldn't you just build up pressure past it's rating until the CFM flow finally increased to match the output of the compressor, and/or just blowing the head if you tried to hook it up like this?

Offline Gilligan

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Re: Air Hose
« Reply #18 on: January 27, 2012, 02:47:29 PM »
That is a GREAT point/observation.

Exaggerated example to make it easier to understand:
Take a paper towel roll and blow through it as hard as you can... no problem right.  Now take a coffee stirring straw and blow as hard as you can through it... don't hold back.  What happens?  You will essentially hurt something (not badly as our body won't let that happen)... but you see the energy just makes your face red and you tired.

The same thing will happen to your compressor... it will expel that energy in the form of heat in the best case scenario and it will blow something (gasket or hose) in worst case... but I doubt that will happen here.

Offline ebscreen

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Re: Air Hose
« Reply #19 on: January 27, 2012, 03:09:10 PM »
We need a resident physicist/engineer.

The inlets on my presses? 3/8's.


Offline Gilligan

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Re: Air Hose
« Reply #20 on: January 27, 2012, 07:25:40 PM »
We need a resident physicist/engineer.

The inlets on my presses? 3/8's.

Agreed, because I'm completely talking out of my @ss... which is about a 3/8's also. ;)

Offline ScreenFoo

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Re: Air Hose
« Reply #21 on: January 28, 2012, 12:18:19 PM »
I guess what I was getting at was, as Moosemans excellent reference points out, higher pressures result in higher CFM flow through the same size pipe--so that pressure would continue to increase, as well as the CFM flow, until all those cubic feet of air energy are in the tank.   Assuming, as mentioned, nothing breaks, no seals blow, etc. 

So I'd think the question would be, what size pipe ensures the pressure doesn't have to increase to deliver all the CFM produced? 

The straw analogy is interesting, but I'm not sure it's quite apt, but only because of the sizes involved:  Say we take a 1" to 1/2" pipe analogy--translate that to one drinking straw, or four.  Although it's much easier breathing in and out through four drinking straws than one, ninjas have taught us one is enough for hiding underwater.
Of course, as we all know, compressors aren't anywhere near as tough as ninjas.   :)

Offline ebscreen

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Re: Air Hose
« Reply #22 on: January 28, 2012, 02:01:45 PM »
Dude, awesome.


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