[TowerTalk] TowerTalk Digest, Vol 122, Issue 58

Patrick Greenlee patrick_g at windstream.net
Tue Feb 26 17:33:37 EST 2013


Would someone please explain to me why you can seal a water pipe made of PVC 
and withstand over 100 PSI but not be able to seal a PVC pipe against 0.0 
PSI because it has wires in it? Sure some regions of the USA have high 
humidity so a little moisture will get into the pipe before it is sealed but 
not huge amounts.  If you have 100% relative humidity and want to have a dry 
interior of your pipe, drilling holes in it won't dry it out but will admit 
moisture.  Purge the pipe with CO2 from an extinguisher, or dehumidified 
shop air, or a bottle of dry nitrogen, a SCUBA tank,  or ... and then seal 
it.  Really, water doesn't penetrate PVC pipe very well if the joints have 
been properly assembled. This leaves just plugging the ends and sealing them 
with an appropriate adhesive sealant such as GE II silicone rubber or Excell 
(silicone alternative.)

The above assumes you seal all terminations of all the wires so that there 
is NO path for water ingress. I assert that if the above is accomplished in 
a workman like manner there will not be water intruding into the conduit. 
Come on, this isn't rocket surgery..... or brain science.... ;) ;)


Patrick AF5CK


-----Original Message----- 
From: Larry stowell
Sent: Tuesday, February 26, 2013 1:06 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] TowerTalk Digest, Vol 122, Issue 58

I live in NC and its gets humid here. Sometimes in the morning it looks like 
it rained overnight.
You would have to seal and purge the air out with a gas as the tele 
companies do to keep the water
out. It's going to get water in it plain and simple.

73 Larry K1ZW

-----Original Message-----


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