[TowerTalk] Buried or Elevated

[Roger (K8RI) on TT]

If the low point is only enough to fill the conduit to full diameter a 
shop  Vac has more than enough power to blow it out.  If the conduit is 
sealed to the Shop Vac it can, or should blow out water over a ft deep 
(12 inches).

I don't know what a shop vac will do, dead headed, but I would guess it 
will hit close to 24 inches.  My dust collector fan should easily hit 36 
to 48 inches. It's on wheels and the bag could be removed giving direct 
access to the exhaust.  It does not depend on air throughput like the 
shop Vacs do, so it could run deadheaded with no flow for an hour.  In 
an open pipe, without looking it up, I'd guess the air flow is in 
thousands of CFM

I purchased mine locally, but it's similar to theirs.  Mine is one that 
uses two of the big bags that are 5 microns, yet will handle several 
machines at once.
Look up dust collector systems in the Grizzly catalog, or on their 
site.  http://www.grizzly.com/

73

Roger  (K8RI)


On 1/29/2016 Friday 1:42 AM, Jim Thomson wrote:
> Date: Thu, 28 Jan 2016 16:26:53 -0500
> From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk at tm.net>
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Buried or Elevated
>
> I installed a "pull rope, or messenger cable" when I installed the
> conduit.  No need for the exercise of blowing a cable through the pipe.
>      The rope is a bit over twice the conduit length.  4th photo from the
> top on http://www.rogerhalstead.com/ham_files/cablebox.htm
>
> 73
>
> Roger  (K8RI)
>
> ##  Buried  PVC, like  3 or  4 or 5 inch....works most of the time, but it can be a crap shoot.
> After working at the the local telco for 34 years, I have seen it all..and heard all the stories from
> co-horts who worked outside all year round.  Some would be dry as a bone after years...and some
> looked like you pumped one helluva lot of water into them.   I have seen some splice box tubs that
> had to be pumped everytime they had to be worked on, and with lid removed, they would be full to the
> top with water, while others were dry.
>
> ##  the other problem with water ingress..... depending on outside temps, and frost line,  water will freeze,
> ice expands, then causes more problems, with pvc bursting or cracking..which allows more water in come spring time.
> Any coax or cables you stuff through the pvc should be able to be immersed in water.  The other issue is the pvc
> settling at a low point, somewhere along its say  200 ft length.   Get water in there, and it will pool up at the low point..
> then have fun trying to dry it out.
>
> Jim   VE7RF
>
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-- 

73

Roger (K8RI)


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