RE: compressed air vs. screwed pipe

i thought that's exactly how i put it - "subject to the limits stated in para 314 of B31.3. ". 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.

We're talking here an altertive for threaded joint that is quick, reliable and cost effective. If its flammable or hydrocarbon then you're better off folling the material based on the piping class develop by the EPC and you wont be considering a threaded and coupled galvanized piping. For compressed air application 3" and u nder you'll be OK with Victaulic (need training and skill to fit it up since end has to be grooved.this is is an engineered product reason the catalog illustrate design requirement).

> ----------
> From: Bruce Bullough[SMTP:bbullough@sebesta.com]
> Reply To: <a href="/group/PipingDesign/post?postID=aCh811_ligTaUPJCb6BPmhlw1qAHm-yynLIuq5qw1xwi9CR-Fni1E8w9kV4ulbuBHwCcIfhuIKTmiWbB0t-qPQ6x">PipingDesign@yahoogroups.com</a>
> Sent: 26 September, 2001 4:28 PM
> To: 'PipingDesign@yahoogroups.com'
> Subject: RE: [PipingDesign] compressed air vs. screwed pipe
>
> My experience is almost exclusively with small piping, so this tempers and
> influences all my thoughts. The past few years I have dealt almost
> exclusively with flammables. Smaller scale operations can often tend to
> be
> seen as flexible in their process, and this leads to plant forces making
> changes.
>
> My understanding is that ANSI and NFPA piping-related codes (and perhaps
> B31.3?) increased in emphasis some years back because there was a
> flammables
> procesing plant designed and built using Victaulic fittings. The plant
> had
> an accident that lead to major disaster becuase the fittings couldn't hold
> up under the new stresses and temperaures of a local fire.
>
> These are great fittings for utilities, esp. where they see mostly a
> compressive load and diurnal-type temperature changes. I have found,
> however, that way too often plant personnel see how easy it is to run
> Victualic or milk-pipe and then decide that is the way to go for future
> modifications, that (in their minds) they can do in house because it's so
> easy. I know of one plant that ended up having to spend over
> US$20,000,000
> plus extensive downtime to replace an extensive network of process piping
> that they had done this way. Also because they had done piping in-house,
> the supports were a disaster, the racking and routing were unsafe, etc.
> Previous Plant managers had been praised and promoted for several years
> becuase they had done so well in keeping costs down. the plant engineer
> wasn't familair with piping design and codes, so he thought nothing of it.
> Obviously a lot of people "dropped the ball", but nonetheless, 20 million
> dollars and nearly losing their business due to improper piping is a big
> deal. I think that we have an obligation to educate plant maintenance
> personnel and plant engineers that Victaulic and other easy to use
> fititngs
> have very limited application, if we intend to use them. Incidentally,
> I've
> seen these fittings improperly used, and for the same reason, by several
> plants in several companies, so it wasn't an isolated incident. Perhaps
> it's just the scale of operations I work in. But my experiences have
> been
> painful to many, so I feel I must present my position!
>
> ... Bruce D. Bullough ...
> Sebesta Blomberg & Associates
> 2381 Rosegate
> Roseville, MN 55113
> 651-634-7344 (office)
> 651-634-7400 (FAX)
> www.sebesta.com
>
>
> -----Original Message-----
> From: SARE, RALPH H. [mailto:SARERH@YANPET.SABIC.com]
> Sent: Wednesday, September 26, 2001 5:59 AM
> To: 'PipingDesign@yahoogroups.com'
> Subject: RE: [PipingDesign] compressed air vs. screwed pipe
>
>
> yes subject to the limits stated in para 314 of B31.3. our line spec calls
> for the use of T&C A53-B ERW Galv pipe up to 3 in. Our plant and
> instrument
> air normally passes thru the air drier before being distributed platwide.
> If
> u dont have a drier and the volume is not significatn u want just want ot
> install a knockout pot to remove moisture.
>
> You may want to consider the use of Victaulic coupling. Lately this has
> been
> our prefered pipe joining system for compressed air and fire water line. U
> may either visit thier site or request for a free catalog. The Victaulic
> is
> certifed to death - UL, FM, etc.
>
> > ----------
> > From: ljh@kochllc.com[SMTP:ljh@kochllc.com]
> > Reply To: <a href="/group/PipingDesign/post?postID=aCh811_ligTaUPJCb6BPmhlw1qAHm-yynLIuq5qw1xwi9CR-Fni1E8w9kV4ulbuBHwCcIfhuIKTmiWbB0t-qPQ6x">PipingDesign@yahoogroups.com</a>
> > Sent: 24 September, 2001 6:08 PM
> > To: <a href="/group/PipingDesign/post?postID=aCh811_ligTaUPJCb6BPmhlw1qAHm-yynLIuq5qw1xwi9CR-Fni1E8w9kV4ulbuBHwCcIfhuIKTmiWbB0t-qPQ6x">PipingDesign@yahoogroups.com</a>
> > Subject: [PipingDesign] compressed air vs. screwed pipe
> >
> > Hi, folks
> >
> > I have a quick and easy question. We are planning a small retrofit
> > of a compressed air blow-down system and the customer would like to
> > use screwed (NPT) pipe for a distribution line. If he uses 3"NPT for
> > the distribution loop, would he be in compliance with ASME?
> >
> > Thanx
> >
> >
> >
> >
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Received on Thu Sep 27 01:49:00 2001