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: PipingDesign@yahoogroups.com [mailto:PipingDesign@yahoogroups.com]
On Behalf Of Thomas Laupa
Sent: Tuesday, October 04, 2005 3:48 PM
To: PipingDesign@yahoogroups.com
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
Yahoo! Groups Links Received on Tue Oct 04 17:39:00 2005
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