Re: New guy here... with a question.

From: <david>
Date: Fri Sep 07 2007 - 16:13:00 EDT

Thanks for the quick response,

   Let me fill you in on the project behind my predicament. We design and fabricate water meter test systems for the utilities industry. This particular job site is a new government installation in Canada. Being that we are located in Florida the installation will be handled by a local contractor so I'm trying to work out all the details now. There will be a 5k recirculation tank located in a basement with the related pumps, etc. The primary discharge off the pump skid is supported by our own fabricated pipe supports anchored to the conc. floor. Where the pipe turns upwards and passes through the floor above, the weight is transferred directly down to the floor via such a support.

   Also, the pipe is isolated at both ends using twin sphere type expansion joints. Vfd's are used on the pumps which help to minimizes any water hammer effects. Other than keeping the occasional nut, bolt or wrench from being lost to the basement below, it's mostly cosmetic. And you are absolutely right about not filling the gap with anything rigid, I was thinking more along the lines of a cover but hadn't counted out the idea of filling it with something that would still allow for some movement. Oh yeah, our systems use potable water only at room temp.

   Anyway, you pretty much confirmed what I feared; nothing commercially available. Guess it's time to go talk to the boys in the machine shop...

   Thanks,
   David A. Zook
   Mars Co.
   Ocala, Fl

   Christopher Wright <chrisw@skypoint.com> wrote:

On Sep 7, 2007, at 8:57 AM, David wrote:

> I have ran into a situation where I need to pass an 8" sch40 steel
> pipe
> w/flanges through a concrete floor to a tank below.

Interesting problem with lots of things you didn't mention. Why do you care about the gap? Cosmetic reasons, leakage, noise? Are you supporting the pipe on the floor at this point? How likely is the pipe to be hit by anything moving across the floor like a hand truck or a forklift. Have you thought about relative motion between the pipe and the floor? (If you haven't you should). What's in the pipe? Is it hot? or cold? Does the temperature vary? Are there water hammer or expansion issues?

I'm inclined to doubt you'll be able to find something mass-produced for a particular gap, but you might have some luck using a plastic slip-on flange to surround the pipe and partly fill the gap and act as a form to allow grouting. The biggest problem you'll have is relative movement. Don't try to seal the gap completely with anything that isn't resilient. And don't bother with anything resilient if you need to carry support loading into the floor. You'll need a separate anchor like a riser clamp for that. If you don't know how to figure the support loading, you should get help. It isn't rocket science, but it's not something you do on the back of an envelope.

If it's strictly decorative, you might be able to use something like this <<a href="http://crown-molding.com/index.asp?">http://crown-molding.com/index.asp?</a> Category=257&PageAction=VIEWCATS> but if it's an industrial environment it may look a little hokey and will doubtless get beat up over time. It won't take any sort of service loading.

Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=Uh7DTMdb2awS3dhF9DWFzhsJ0IuLQFcS_D_Ko0EvIEbl6K5KJSU-_CqnZXMntjaSpAgslXGZQKgV6tk">chrisw@skypoint.com</a> | this distance" (last words of Gen.

.......................................| John Sedgwick, Spotsylvania

1864)
<a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a>

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[Non-text portions of this message have been removed] Received on Fri Sep 07 16:13:00 2007