[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
> >
> > MODEL ENGINEERING DISCUSSION LIST.
> >
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> >
> 
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