RE: FW: Drain systems

From: <Banner>
Date: Sat Mar 03 2001 - 17:57:00 EST

Thanks to all who responded to my query about drain system piping.

Here's what we did:

1. Discovered that the 2 client requests - for a 5 degree slope minimum and sweep elbows - could not be met in a locally available PVC or CPVC spec.
2. Investigated the origin of the CPVC decision and found it lacking justification.
3. Went back to a Cast Iron spec with directly available pipe and fittings to ASTM A888, sweep bends, and the ability to deflect horizontal lines to the 5 degree request.

I personally learned a lot from this exercise, through leads from your responses and some general web surfing, plus the obvious "help" from the "experts" at my home office. There is obviously some dissension out there about the iron versus plastic issue, plus some attraction to FRP as an alternative. Also the Cast Iron versus Ductile Iron story varied from vendor to vendor. Issues of ease of handling in the field, both from installation and supporting viewpoints came up, too. Bottom line, get your specs set and detail up your piping systems during the design phase - don't wait for construction to "field route" 4" piping/plumbing systems unless you know the piping superintendent personally !!

Thanks again.

-----Original Message-----
From: Paul Bowers [mailto:pbowers@pipingdesign.com] Sent: Thursday, March 01, 2001 8:18 PM
To: <a href="/group/PipingDesign/post?postID=SyP_sMiCD20b87SI_8immBFIDeBKZF3iDIT0nYSdJQQhdazRPWe1jDkp1oX2SHRlVLp6yx4fJRyaXw3w2xcokz68udG21Qo">PipingDesign@yahoogroups.com</a> Subject: Re: [PipingDesign] FW: Drain systems

Did you have a look at
<a href="http://www.pipingdesign.com/plasticpipe.html">http://www.pipingdesign.com/plasticpipe.html</a> ?

Specifically, maybe <a href="http://www.plasticpipe.org/pubs/pubslist.htm">http://www.plasticpipe.org/pubs/pubslist.htm</a> and http://www.vinylbydesign.com/piping/design.html .

How important are considerations like manufacturing tolerances for drain pipe?

Paul

> > Hi, anyone out there like to comment on the following:
> >
> > I have a drain system to layout on a power job for dewatering
and absorber
> > building light slurried wash-down. What was a cast iron spec
has been
> > changed
> > to PVC/CPVC, and general requirements are 3D minimum bends, no
tees
> > (laterals
> > only) and a 5 degree minimum /10 degree preferred slope.
> >
> > We need short term delivery items for installation ASAP, but
standard
> > plastic
> > catalogues do not indicate sweep elbows or laterals. Also the
issue of
> > out-of-
> > true slope on fitting tolerances are not addressed in the
vendor technical
> > manuals - i.e. how far out-of-true
> > fittings in PVC can be misaligned and retain joint integrity.
> >
> > Is a PVC system a good choice for this application - obviously
weight and
> > ease-of-installation are bonuses - or is it a poor substitute
for cast /
> > ductile iron?

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