[BC] Air-Dielectric Sections

[Mike McCarthy]

I'm using the same stuff used in horizontal boring.  Problem is they can't 
bore more than 150 on pipe that big...and then need to dig holes to join 
them.  So in either case, the ground system is damaged.

What I'm saying is not even factoring concrete encasement, the fiber duct 
installed is cheaper than PVC installed without protection.  If you add 
concrete or tile, the differential compared to fiber duct is even more 
favorable to fiber duct.

MM

At 02:56 PM 3/5/2007 -0500, Phil Alexander wrote
>On 5 Mar 2007 at 11:31, Mike McCarthy wrote:
>
> > I'm thinking hydraulic sub-soil conditions where freeze/thaw or other
> > geological pressures creates a force on a rock/bolder and will bust the 
> PVC
> > clear through and compressing the line.  Doing that to a 5" #11 or #13
> > fiber duct would be brutally difficult since the walls are over 1/2" thick.
>
>Exactly. And rodents don't chew through so easily as PVC.
> >
> > On the 3" line we installed for our project, duct was about $2/ft. 
> compared
> > to $0.50/ft. for grey electrical PVC in quantity.
>
>But if you protect the PVC with field tile or concrete conduit, as I believe
>is essential, the cost saving evaporates, and then some.
>
> > But we made up for that
> > cost in labor savings.  It took one day for two men to lay out 3000 ft. of
> > duct....on 6 spools.  Try that with conduit.
>
>Clearly, you have the best idea - using fiber duct, but depending on the
>situation (e.g. if an AM) I'd strongly consider directional boring and the
>corrugated conduit they use.
>
> > I read it as an open statement not offering preference to one type of line
> > over the other.
>
>OK but the idea of using 3-1/8" rigid in horizontal u/g run seems bizarre to
>me, but maybe that's just me. <g>
>
>
>---------------------------------------------
>Phil Alexander, CSRE, AMD
>Broadcast Engineering Services and Technology
>(a Div. of Advanced Parts Corporation)
>Ph. (317) 335-2065   FAX (317) 335-9037
>
>
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