[modeleng] Re: plastic pipe

I'm with you, Jeff---Copper for supply lines and PVC
for drains.

Al Messer

--- Jeff Dayman <jeffdayman@xxxxxxxxxxxx> wrote:

> Hot water at low/no pressures yes, steam no. I work
> in plastics moulding and
> part design and have many years' experience
> specifying plastics. Generally
> they do not work well in steam with a couple of
> exceptions, PPS and PUI as I
> mentioned. Personally I will not have ANY plastic
> water pipe in my house
> under pressure, since much can and does go wrong
> over time. (Look up
> plastics resin creep and plastics weld line defects
> on the web if you don't
> believe me.) Any plastic pipe carrying pressure
> except PPS and PUI is a time
> bomb. It may never burst but it also might. Many
> have here in Canada,
> causing major home damage, and building inspection
> authorities are reviewing
> all plastic pressure pipe specs now. The only reason
> it's popular is it's
> fast to install by new house butchers ahem builders.
> For non pressure
> applications like drains, ABS and PVC are excellent,
> but I don't trust them
> under hi temp and pressure.
> 
> 
> ----- Original Message ----- 
> From: "Allen Messer" <al_messer@xxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Monday, April 24, 2006 10:38 AM
> Subject: [modeleng] Re: plastic pipe
> 
> 
> > Jeff,
> >
> > I do not know if you get the PBS program "This Old
> > House" in your area or not, but on one program, in
> the
> > Boston, Mass. area, they were re-doing an old
> house
> > and a great deal was made of the fact that all the
> old
> > plumbing was being replaced with plastic piping,
> both
> > for Hot and Cold water service.  The fact was
> loudly
> > trumpeted that the plumber could install it much
> > faster than the old fashioned way because all he
> had
> > to do was cut to length with a box cutter knife
> and
> > "glue" it together at the joints.
> >
> > I cannot remember exactly what it was, apparently
> > something new to the market since I got out of the
> > building maintenance business.
> >
> > Alan, if I may be nosy, why do you wish to use
> plastic
> > with Steam?
> >
> > Al Messer
> >
> > --- Jeff Dayman <jeffdayman@xxxxxxxxxxxx> wrote:
> >
> > > CPVC or any other PVC pipe,  or ABS pipe will
> NOT be
> > > suitable for steam. It
> > > will soften, lose strength,  and possibly blow
> out
> > > at anything above 220 F
> > > at over 10 psi.
> > >
> > > PC (polycarbonate) and acrylics also not
> suitable.
> > >
> > > Cheers, Jeff Dayman Waterloo Ontario Canada
> > >
> > >
> > > ----- Original Message ----- 
> > > From: "Jesse Livingston" <fernj1@xxxxxxxxxxxxx>
> > > To: <modeleng@xxxxxxxxxxxxx>
> > > Sent: Sunday, April 23, 2006 9:43 PM
> > > Subject: [modeleng] Re: plastic pipe
> > >
> > >
> > > > Alan,
> > > >
> > > > At the risk of seeming to "Harold" you, I will
> say
> > > that good old Harold
> > > made
> > > > several comments on the use of plastic pipe
> for
> > > use as compressed air
> > > lines.
> > > > He said he had seen plastic pipe burst with
> only
> > > air pressure under
> > > certain
> > > > conditions where the pipe got hot and pressure
> was
> > > probably in the 100psig
> > > > range..
> > > >
> > > > If I were going to try to use plastic as low
> > > pressure steam line, I would
> > > > use the pipe called "CPVC' that is intended
> for
> > > domestic hot water
> > > service.
> > > > That ought to work out OK as our son has
> around 40
> > > PSI of water pressure
> > > > (his house is in a low area and near a tall
> water
> > > tank) and he has not had
> > > > any problems with hot water pipes (145°F)
> > > bursting.  275°F might be a
> > > horse
> > > > of a different colour though so proceed with
> > > caution.
> > > >
> > > > Jesse in Tennessee
> > > >
> > > >  Does anyone know of any plastic pipe that
> will
> > > withstand low pressure
> > > >  (around 25-30psi) steam.?
> > > >  That is a temperature of around 275F, and I
> would
> > > have thought that may
> > > be
> > > >  within the range of some modern plastics.
> > > >
> > > >  Alan
> > > >
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