Burial duct

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David Lesher's Avatar (by Gravatar) posted on
April 13, 2010, 5:24 pm
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I need some direct burial duct to be laid in a trench. (Not rammed in..)
~1200 ft worth.

What's the right buzzword to call it? Source?

Assuming we get the polyethylene pipe flavor; what's a
reasonable pull length?

Do those internal ribs buy you anything when you're pulling not just
fiber, but fiber and copper and maybe coax?

An alternative would be Schedule 40 PVC of say 3" dia, and pull boxes.
Does that have any pluses?


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Doug McIntyre's Avatar (by Gravatar) posted on
April 13, 2010, 5:47 pm
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Re: Burial duct


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I've always done 4" Schedule 40 pipe. If this is for fiber for a telco,
most have a standard of 4" ducting, and would complain at a 3" duct.


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Can't tell you at that length. Minimize any bends though. Do sweeps
rather than elbows or 45's.

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The "standard" way is to pull innerduct inside the 4" duct (ie. Carlon
makes a wide range). I've been told the ridges are for holding pulling
lube & reducing friction. You could fit 4  1" innerducts pretty easily
in a 4" duct. If you utilize two of the innerducts, that future proofs
you for two more to use if you need to pull something else down the line.


Robert Redelmeier's Avatar (by Gravatar) posted on
April 13, 2010, 6:02 pm
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Re: Burial duct


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Maybe.  Keep in mind long tubes are _never_ straight.  Worse after
settling.  They go up and down, side-to-side by at least one
diameter many times over a run.  When you pull anything, it goes
in taut -- you can only relax 10-30' at each end.  The rest of
it is the straightest shot through all the slow bends.  The lines
aren't twisted, but the pipe is!  Long repulls can fail.

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Mostly minuses of water inflitration, breathing and sweating.
You know to stay away from 90'elbows -- one of the few times
it's OK to think like an electrician!

-- Robert


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