ST0701-CS100510
(9/7/2011) Keith Marvin - RE: Bridge Conduit DetailPage 1
From:
"Rodriguez, Jorge" <jrodriguez@halff.com>
To:
Keith Marvin <kmarvin@coppelltx.gov>, Kody Harris <kharris@lhlacy.com>, ...
CC:
Richard Odell <RODELL@coppelltx.gov>, "Littleton, Dave" <dlittleton@half...
Date:
5/10/2010 11:20 AM
Subject:
RE: Bridge Conduit Detail
Guys
I reviewed the below alternatives with the structural engineer and he would like to maintain the PVC
conduit and support it at a maximum of 5 foot spacing.
Please call me if any question
Thanks
Jorge
Jorge L. Rodriguez, P.E.
-----Original Message-----
From: Keith Marvin [mailto:kmarvin@coppelltx.gov]
Sent: Monday, May 10, 2010 11:00 AM
To: Rodriguez, Jorge; Kody Harris; Miranda Harris
Cc: Richard Odell; Littleton, Dave; mattO@pactrust.com
Subject: Re: Bridge Conduit Detail
The City of Coppell has reviewed the proposed bridge attachment. It is our opinion that PVC pipe needs
to be supported at a greater interval than every 10 feet. Our suggested solution is to maintain the 10 foot
spacing and use rigid metal conduit, or maintain the PVC conduit and support it at a maximum of 5 foot
spacing. Either of these options would be acceptable to us.
Feel free to call me to discuss this.
Keith
Keith Marvin, P.E.
Project Engineer
(972) 304-3681
>>> "Rodriguez, Jorge" <jrodriguez@halff.com> 5/6/2010 9:26 AM >>>
Miranda
The enclosed details shows how to attach the 2" conduit to the bridge. The City of Coppell shall approve
the proposed detail.
Please call me if any question
Thanks
Jorge L. Rodriguez, P.E.
Project Manager
[cid:image001.jpg@01CAECFE.2DF01EC0]
HALFF ASSOCIATES, INC.
Page 1 of 1
Keith Marvin - Re: Fw: Bridge Conduit Detail
From:Per Birdsall
To: Keith Marvin
Date:5/10/2010 10:07 AM
Subject: Re: Fw: Bridge Conduit Detail
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?
file://C:\Documents and Settings\radloo\Local Settings\Temp\XPgrpwise\4BE7DACACity_...9/7/2011