[Fwd: Re: [STM] Re: Steam line intermediate anchor]

• Original Message -------- From: Tony Conner Reply-To: steam-list@lists.cc.utexas.edu

I think you'll find that with direct buried steam lines, the pipe will expand inside the insulation. I would characterize the earth as being more of a virtual support/guide system, as opposed to an anchor in this type of installation. We tried to have manholes at street intersections contain the main valves, drip legs & anchor points. The manholes in the middle of blocks
would normally contain back-to-back single expansion joints, with a common anchor point, with a drip leg between them. We found that trying to have line valves and expansion joints in the same manhole structures caused space
problems. Intersections are usually just full of existing utilities, and trying to cram a large manhole structure in there was a big problem. We also
found that a pair of single expansion joints installed back-to-back gave us a lot more flexibility when it came to "threading the needle" through all of
the existing underground utilities. It also allowed us to install a full sized drip leg near the anchor point between the joints, which made for a lot less fooling around when trying to deal with expanding steam lines acting on much smaller drip leg piping.

• Original Message ----- From: "Paul Bowers" <pbowers@PipingDesign.com> To: <steam-list@lists.cc.utexas.edu> Sent: Thursday, June 23, 2005 9:44 PM Subject: [STM] Re: Steam line intermediate anchor

>A comment from a pipingdesign.com listmember (I forwarded the original
>inquiry to the group).
>
> Paul
>
>
> -------- Original Message --------
> Subject: [PipingDesign] Re: [Fwd: [STM] Steam line intermediate anchor]
> Date: Fri, 24 Jun 2005 01:33:30 -0000
> From: jcluf
> To: PipingDesign@yahoogroups.com
>
> So as to clarify this layout.... The lines enter and exit manholes
> where there are slip type EJs located. After leaving the side of the
> manhole the line is immediately buried???? Or is it in a casing pipe
> ??????
>
> If the line is buried it will develop whats called and described by
> some as a virtual anchor... the ground will develop local
> plastic deformations but in essence will restrain the pipe.
>
> A chase pipe is another matter altogether.
>
>
>
>> From: Gephardt, Tim <gephardtt@m...>
>
>> We have a 16", 60 psig steam line constructed in 1955, and it
> was
>> placed in a chase type system with slip style expansion joints in
>> concrete manholes to compensate for thermal expansion.
Received on Fri Jun 24 08:02:00 2005