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

From: <Bruce>
Date: Tue Oct 04 2005 - 17:39:00 EDT

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=IltJu3Bdxmp1mUxsYLyoJy6KpFrFO4zlmKenGzYMhK9Rc43DQSyPfbT1cFcgLeFdzvaIRtIfGhSVmo-UYCN6XdSH">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=IltJu3Bdxmp1mUxsYLyoJy6KpFrFO4zlmKenGzYMhK9Rc43DQSyPfbT1cFcgLeFdzvaIRtIfGhSVmo-UYCN6XdSH">PipingDesign@yahoogroups.com</a>] On Behalf Of Thomas Laupa
Sent: Tuesday, October 04, 2005 3:48 PM
To: <a href="/group/PipingDesign/post?postID=IltJu3Bdxmp1mUxsYLyoJy6KpFrFO4zlmKenGzYMhK9Rc43DQSyPfbT1cFcgLeFdzvaIRtIfGhSVmo-UYCN6XdSH">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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Yahoo! Groups Links Received on Tue Oct 04 17:39:00 2005