Re: Gasket Sealant for Sulfuric Acid Service [bcc][faked-from][mx][spf]

Would installing metal backing rings on either side of the flange let you tighten down on the joint? The backing rings could be two segment so that the line does not have to be taken down for installation. I don't do this kind of work, but it is my first thought, and if this is not suitable, I am interested in the reason why.

Ivan Locke

Bruce Bullough wrote:

>Thomas,
>
>Silicon types (RTV) are definitely a no-no. If you can find a
>teflon-type, go for it. The best compromise that I can think of is
>Gortex rope. Because you are using PVC you can't tighten it like you
>really need to in order to get the deformation needed on the gortex, but
>it might be adequate.
>
>Since it's PVC, why not just cut our the old flanges, glue in new
>couplings, and install new flanges to fit? It ain't dirt cheap, but
>also not very costly, and it'll work, and you must shut down, drain, and
>rinse even to put in a gasket sealer.
>
> ... Bruce D. Bullough ...
> Sebesta Blomberg & Associates, Inc.
> 2381 Rosegate
> Roseville, MN 55113 USA
> desk: 651-634-7344 fax: 651-634-7400
> www.sebesta.com
>
>
>
>
>-----Original Message-----
>From: <a href="/group/PipingDesign/post?postID=UIMgagqyBh50YNT7VtnMrWPYHlrW7Kt3in7Wkpp8u3gS9NOk7csf4NJ5dTdEVxb4CuAh5j7HHRiLI5mvwxLTv0ye71rDfQ">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=UIMgagqyBh50YNT7VtnMrWPYHlrW7Kt3in7Wkpp8u3gS9NOk7csf4NJ5dTdEVxb4CuAh5j7HHRiLI5mvwxLTv0ye71rDfQ">PipingDesign@yahoogroups.com</a>]
>On Behalf Of Thomas Laupa
>Sent: Tuesday, October 04, 2005 3:48 PM
>To: <a href="/group/PipingDesign/post?postID=UIMgagqyBh50YNT7VtnMrWPYHlrW7Kt3in7Wkpp8u3gS9NOk7csf4NJ5dTdEVxb4CuAh5j7HHRiLI5mvwxLTv0ye71rDfQ">PipingDesign@yahoogroups.com</a>
>Subject: [PipingDesign] Gasket Sealant for Sulfuric Acid Service
>[bcc][faked-from][mx][spf]
>
>Gents:
>
>we have a sulfuric acid system constructed of PVC. one of the flanges,
>PVC
>with a soft viton gasket, is exhibiting minor leakage. we have
>installed a
>new gasket to no avail, and believe that one of the mating surfaces is
>slightly damaged. of course, the PVC material keeps us from "cranking
>down" too tight.
>
>i think a gasket sealer is worth trying, but all of my supplies shy away
>
>from "sulfuric acid". a web search has also left me dry.
>
>any general thoughts on the proper sealant material?
>
>
>
>
>Thomas G Laupa PE
>Senior Engineer - Nalco Company
>Office Address: 1601 Diehl Road, Naperville, IL, 60563
>Courier Address: 1003 Remington, Fort Collins, CO, 80524
>970-227-5127
>800-493-5009 fax
>
>
>
>
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Received on Tue Oct 04 17:55:00 2005