Two solutions, depending on the service:
First, for industrial applications make a spool piece with connection flanges at each end and a plate, square or circular about midway along the spool. The plate is sized co cover the floor penetration and will have holes at its outer edge to permit it to be dynabolted to the floor. Use a sealant between the underside of the plate and the floor and, combined with the dynabolts, you can make a strong waterproof connection. You have to make provision for the connecting pipe pipe expansion and movement, but you are already providing expansion/isolation joints which will most likely check out to be suitable for this additional demand.
Second, there are rubber boots available which can be slipped over, and strapped to the pipe and also attached to the surrounding surface (floor in your case). They are easy to seal but not especially durable. Your local mechanical building services contractors will source them for you as they will use them by the hundred for pipe flashings through walls and roofs. Your may need separate support for the pipe.
Cheers
Steve
>From: Jack Osborn <jhosborn@yahoo.com>
>Reply-To: <a href="/group/PipingDesign/post?postID=mDX92wteOAi9npL1mU1lYxHRij3b0RESyCobrTJnETHmHW2TRf8oH5JU1q198-f7VYHWOrnPduGTRbqpYBvF8dD_">PipingDesign@yahoogroups.com</a>
>To: <a href="/group/PipingDesign/post?postID=mDX92wteOAi9npL1mU1lYxHRij3b0RESyCobrTJnETHmHW2TRf8oH5JU1q198-f7VYHWOrnPduGTRbqpYBvF8dD_">PipingDesign@yahoogroups.com</a>
>Subject: Re: [PipingDesign] New guy here... with a question.
>Date: Fri, 7 Sep 2007 13:32:13 -0700 (PDT)
>
>Chris....David....we generally will grout in a void like this.....flush
>with the floor.
>
>Jack
>
>*******
>Jack Osborn, P.E.
>Mechanical Engineer / Project Manager
>Lee & Ro, Inc
>925 937 4050 ext 402
>
>
>
>
>
>----- Original Message ----
>From: Christopher Wright <chrisw@skypoint.com>
>To: <a href="/group/PipingDesign/post?postID=mDX92wteOAi9npL1mU1lYxHRij3b0RESyCobrTJnETHmHW2TRf8oH5JU1q198-f7VYHWOrnPduGTRbqpYBvF8dD_">PipingDesign@yahoogroups.com</a>
>Sent: Friday, September 7, 2007 11:45:12 AM
>Subject: Re: [PipingDesign] New guy here... with a question.
>
>
>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 <http://crown- molding.com/ index.asp?
>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
>chrisw@skypoint. com | this distance" (last words of Gen.
>............ ......... ......... ......... | John Sedgwick, Spotsylvania
>1864)
>http://www.skypoint .com/~chrisw/
>
>
>
>
>
>
>_______________________________________________________________________________\
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