Sloped Piping: Consider using "bent" piping to achieve the amount of slope
you require. Its been my experience working within the chemical processing
and pharmaceutical industries that using "Bent and Flared" piping (where
allowed by ANSI/ASME B31.3) can result in significant cost savings versus
welded fabricated systems. Anywhere from 20-40% savings can be realized. The
size ranges for these systems generally are from 1/2" thru 4" (tho 6" and 8"
can be bent) with schedule 40 or 40S walls usually being the maximum. Flared
piping (to save the cost of a stubend and a weld) cannot be used for "severe
cyclic conditions" and for ANSI B31.3 Category "M" Lethal Service. Another
point is that on flared piping there isn't a serrated gasket facing on the
finished product. Also another downside is the "thinning" or loss of outer
wall thickness when bending pipe. This must be taken into consideration when
handling corrosive materials or when pushing the envelope on the
pressure/temperature limitations of the pipe wall. Generally this is a mute
point until you pass 12" nominal sizes. On the lesser sizes the flanges are
almost always the "weak link". If you are doing fabrication within the USA
there are many "Bent & Flared" fabricators to accommodate your needs.
Everett Nichols
> I'm right out of engineering college and have been challenged with the
task
> of routing interconnecting piping for a pharmaceutical grade plant (module
> design of skids).
> Armed with Quickpen's Pipedesigner 3D and P&ID's, I have to come up with a
> complete plant piping within weeks.
> I've picked up a thing or two from this forum, brainstorming within my
team
> and general reading. I have to admit though, I have more questions than
> answers. To give you an example of some of the basic questions I had/have
> were -
>
> *Should I run N-S piping at a set elevation and E-W piping at another
> elevation (say 24" lower)
> * Now, I have SS piping that starts in the N-S direction (pipe rack) and
> then runs in the E-W direction (to a tank, say) . If the N-S AND the E-W
> piping is sloped at 1/8" per foot why don't they make an elbow at 89.4
> degrees or 90.6 degrees (and other odd angles)... I thought about that one
> for days and came up with the solution that the piping is going to have to
> 'flex' and instead of pre-fabricating the piece, I'll have to leave a
spool
> piece or two for a field fit based on the 'give' of this BP fitting.
>
> As you can see, all my questions are basic-basic with their solutions
(basic
> logic) being more basic. I'd appreciate any thumb rules you can share with
> me and also point me in the right direction as far as resources go
> (seminars, books, classes, etc.). It seems I'm trying to rediscover the
> 'art' of piping, routing, plant layout when someone else has probably
> thought through it over the years already.
> So even though the rule says don't type in this as your descriptive, I'm
> going to anyways...HELLLLLLLLLLLLLLLLLLLLP !!!!
>
> Thanks in advance for your time and help,
>
> Ragz
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
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Received on Wed May 16 11:42:00 2001
This archive was generated by hypermail 2.1.8 : Tue Mar 04 2008 - 11:40:10 EST