[AT] Pressure drop?

[rlgoss at insightbb.com]

You guys are a stitch. I've been laughing for an hour over this thread.

Farmer, if you really want to know, go to:  http://www.efunda.com/formulae/fluids/calc_pipe_friction.cfm

Plug in the measurements and have at it.  The sample calculation has a pressure drop of about 5 psi, but I didn't really check the size of the pipe or the distance.

Search in Google for "Reynolds number"  if you want to have your eyeballs roll to the back of your head.  But some of you "senior statesmen" on the list should pay attention to the material that is written about the physiological effects of a Reynolds number and how it relates to heart disease high blood pressure, etc.

For more practical information, search for pipe pressure loss or pipe friction.

With your pneumaic nailer, you aren't going to use enough air to ever notice any loss.  But with the paint gun, you may not be able to have good results with the larger high-pressure style that is popular today.

BTW, Farmer, I suspect your engineer friend was a graduate of Purdue because he was dead wrong and wouldn't admit it.  Before you all start flaming, I attended and graduated from that fine institution, but I also taught there and I know a little bit about what goes on there on the "other side" of the desk.

Larry
 
----- Original Message -----
From: Lew Best <bee_keeper at earthlink.net>
Date: Tuesday, January 29, 2008 23:26
Subject: Re: [AT] Pressure drop?
To: 'Antique tractor email discussion group' <at at lists.antique-tractor.com>

> I'd think with zero use the pressure would be the same at both 
> ends but
> friction might cause a drop at the end of the line if there's 
> flow to a
> tool using air?  Just guessing but it seems logical to me.
> 
> Lew Best near Waco, TX
>  
> -----Original Message-----
>  group
> Subject: [AT] Pressure drop?
> 
> OK, who knows compressed air pressure drop off of the top of
> your head? 
> :-)
> I am going to run a compressed air line from one shop to the
> other. It 
> will run inside of an underground conduit in 1/2" PEX tubing. It 
> will 
> basically have one fitting (full 1/2") at each end of the run. 
> The run
> will 
> be 250' long with no fittings at all in the line itself. If I 
> have 125
> PSI 
> at one end what kind of drop can I expect at the other end? What would
> it 
> be at 800'?
> BTW, PEX is rated and recommended for compressed air. I was
> reading the 
> print on the pipe today and for water what I have on hand at the 
> momentis 
> rated at 100 PSI at 180 degrees F. It will not get hard and 
> brittle and
> it 
> will not shatter on impact. It is cross linked polyethylene and 
> is not 
> affected by oil.
> I am really in love with this stuff for water plumbing.
> 
> 
> 
> 
> 
> --
> "farmer"
> 
> 
> Francis Robinson
> Central Indiana, USA
> Robinson at svs.net
>  
> 
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