ST0701-SP100510
(8/8/2011) Keith Marvin - Re: Fw: Bridge Conduit DetailPage 1
From: Keith Marvin
To:Birdsall, Per
CC:Hollowell, Glenn
Date: 5/10/2010 10:09 AM
Subject: Re: Fw: Bridge Conduit Detail
Thanks Per. This is the conduit that will hold our fiber, so we want to make sure it's done right.
Keith
>>> Per Birdsall 5/10/2010 10:07 AM >>>
I believe 10 feet is too wide of a span for PVC. Below are not my words but taken from a website/blog answering the same
question. The recommendations sound reasonable without getting too technical. I would prefer at most 5' minimum spacing. Per
Normal span for conduit is 10ft. BUT that is metal conduit. PVC is different. IF it is dealing with temperatures over 150 deg F, then
it needs to be continuously supported. 100 deg F should be support approx. every 5 ft. the support should cradle the conduit for a
length equivalent to approx. 1/2 to 1 pipe dia. and not less than 120 deg.s of pipe dia. & supt. should be free of sharp edges. this
supt. should provide a guide without restraint in direction of movement. Heavy fittings should be supported on each side.
Thanks, Per
>>> Keith Marvin 5/6/2010 5:20 PM >>>
Fyi... Anyone have any comment on the proposed bridge attachment for our conduit on Southwestern?