[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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