RE: compressed air vs. screwed pipe

in refirnery or petrcochem, leak on Categroy D (non-hazardous, non-critical piping) is alnost routine. Plenty of of quick fix here(on-stream if need be) using enginerred clamp like those supplied by Plidco, Furmanite or Cooperheat Therefore the use of mechanical clamp, threaded joint, weld or flange is really non-issue since its permitted under the rules of B31(within the prescribe limits

Point is, a Category D piping can easily be isolated and leak manage without risk to property, lives and production. Basically our worry starts with piping classified as critical - where a leak if it happens result in fine, catashtrophic failure and disruption of production. This type of piping, the selection of material, type of joints, hydraulics, constructability, and effects of corrosion undergoes engineering evaluation. Here compliance goes beyond layout and fabrication.

> ----------
> From: A. M. Finke[SMTP:twobarb@yahoo.com]
> Reply To: <a href="/group/PipingDesign/post?postID=wr0uR1DBQfhA0YKlD42a-uyDvMZ1Zmnf3HnD7CcHkUrDdEBReRDhGONw2yKKcGvF9lD9SwSrkBFqRUAgHizlXr-qEOpNEA">PipingDesign@yahoogroups.com</a>
> Sent: 27 September, 2001 5:37 PM
> To: <a href="/group/PipingDesign/post?postID=wr0uR1DBQfhA0YKlD42a-uyDvMZ1Zmnf3HnD7CcHkUrDdEBReRDhGONw2yKKcGvF9lD9SwSrkBFqRUAgHizlXr-qEOpNEA">PipingDesign@yahoogroups.com</a>
> Subject: Re: [PipingDesign] compressed air vs. screwed pipe
>
>
> On Thursday, September 27, 2001, at 12:49 AM, SARE, RALPH H. wrote:
> > Victaulic has limitation the very reason it was
> > suggested only for fire water, compressed air plus HVAC cooling or
> > what we
> > term as Category D piping. Flammables are not Category D and falls
> > under the
> > restriction stated in 314.
> >
> I would like to bring up some rare case downfalls of victaulic.
> These are just problems I have run into in the field.
> Rust. I was once called in to repair an air over water fire line that
> ruptured at the coupling because one of the two bolts rusted and broke.
> Upon further inspection most of the bolts were shot. We ended up welding
> the joints on a weekend with the fire dept on site since it was the main
> fire line. It was costly.So watch out in high humidity corrosive
> environments.
> While I myself often use victaulic on temporary piping. Emergency
> crossovers, bypasses etc. The fact that it installs quickly, and easily
> is often its downfall. People get in a hurry and fail to properly
> support the piping, gaskets are often torn, or pinched and pipe is
> rarely laid out straight. I have seen companies throw day labor at vic.
> lines armed only with a wrench and a bucket of grease.
> It moves all over the place, even when using the rigid couplers,
> and requires more frequent supports.
> Gasket failure. I have seen multiple gaskets fail for various
> reasons. Selection, instillation, operating conditions you name it. Have
> you ever tried to replace a gasket in the middle of a run? For these
> last two reasons we have built a set of line-up clamps that will hold
> the pipe allowing you to remove the clamp cut the gasket off and weld
> the joint.
> Final cost. Vic. lines are more time consuming to insulate they
> also require different jacketing (sometimes). Additional supports add up
> quickly as well, and if a poorly installed line has to be tweaked the
> cost will skyrocket. I have been in on one job where the final installed
> cost worked out to be higher than if the piping had been welded. You
> need also account for shipping costs. We came up short several 6" 90's
> once and the cost of getting them to us when we needed them plus there
> cost was higher then grooving a couple of 3" joints and welding them on
> to a 90 that the supplier keeps in stock. Of coarse if you are not in
> the sticks then this is probably not the case.
>
>
> People who give up essential liberty to obtain a little temporary safety
> deserve neither liberty nor safety,
> Benjamin Franklin
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ___________________________________________________
> If you want only site update notifications, go here:
> mailto:<a href="/group/PipingDesign/post?postID=tpB-ibZVIEBaVU2zbjrbFtdKT-dbWoHLjy56uJLnlwZF49Tm7mYVz3Bpd1u9pa7Au_98N8E-7TzHWCwd7cdG2RHTjvuBLpCGGxkU1e0-X8rIig">PipingDesignNews-subscribe@yahoogroups.com</a>
> _____________________
> Piping Design Central
> [ http://www.PipingDesign.com ]
> ________________________________________
> We hope you find this newsletter useful.
> If not, you can unsubscribe at:
> <a href="/group/PipingDesign/post?postID=iVzrcWF6j-E34Ecv2zX7kmlDcz9M58sNqo2ZmEwcdwAc7mqgkplwDI3xvojpsPimhfef-whTaA1kXz-ds4zf58AN6EnjgcpixkYgjA2TtA">PipingDesign-unsubscribe@yahoogroups.com</a>
> Post message: <a href="/group/PipingDesign/post?postID=wr0uR1DBQfhA0YKlD42a-uyDvMZ1Zmnf3HnD7CcHkUrDdEBReRDhGONw2yKKcGvF9lD9SwSrkBFqRUAgHizlXr-qEOpNEA">PipingDesign@yahoogroups.com</a>
> Subscribe: <a href="/group/PipingDesign/post?postID=RKjwkACh8Edb_I4g6j9GwB8K9raeCVV0KLCP9RHJ-OiBEjcJ7lwOM5_EilQvWhCBJBss1NEwsIkWcE6BQJcihlBF67ldiTSN1kpY9OJA-k8">PipingDesign-subscribe@yahoogroups.com</a>
>
> Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a>
>
>
Received on Sat Sep 29 00:45:00 2001