[AT] Pressure drop?

[charlie hill]

Gene PEX fittings have been re-designed.  I guess the old mechanical 
fittings are still around but the new way involves using a tool that 
stretches the pipe.  Then it is slid over the fitting.  The PEX shrinks back 
to it original size and supposedly won't come off.

Charlie
----- Original Message ----- 
From: "Gene Waugh Elgin, Illinois USA" <gwaugh at wowway.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Wednesday, January 30, 2008 2:00 PM
Subject: Re: [AT] Pressure drop?


> What has interested me the most in this thread is the use of
> PEX--farmer, someone asked what fittings you will be using?  I think
> they make barbed fittings that use a compressed band to hold them
> together, and perhaps they have a threaded compression sort, as was used
> with the old Quest.  (Qest?, memory is failing) piping, which turned out
> to burn many, many people.  Biggest problem was the fittings, especially
> aluminum compression rings for the crimped fittings.  Especially on the
> hot side, the aluminum would work-harden and eventually let go.  There
> were also rings of a copper alloy, and I don't think they were nearly
> the problem.  Sploosh!  We would test it hydraulically to about 160 psi.
>
> Using PEX for air doesn't bother me anywhere near as much as PVC---at
> least you won't have shards flying around, just a big ol whipping snake
> perhaps!  Again, I am curious as to the fittings used.  Unless you
> simply have the 1/2" lying around and want to use it, I sure think I
> would go with at least 3/4" for such a long run.  Personal opinion.
>
>
> /Gene
> Gene Waugh
> Elgin, Illinois USA/
>
>
> Francis Robinson wrote:
>> 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 moment 
>> is
>> 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"
>>
>>
>>
>>
>
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