Phil,
Plastic has changed. Engle PEX tubing (the best type of cross-linking)
currently holds the unofficial world record for long-term testing at elevated
temperatures and pressures -- 23 years at 203 � F at 152 psi, and still going.
PEX tubing is rated at 180� F at 100 psi, 200� F at 80 psi and 73.4� F at 160
psi.
Also, PEX's flexibility prevents creep deformation, or weakness in joints,
caused by movement within the piping of a plumbing system. Over time, this
occurs in less flexible plumbing systems. The flexibility of PEX allows for this
movement and adjustment.
Unlike copper, PEX resists freeze-breaking. PEX material stretches to match the
swelling of frozen water. It then tightens back to its original form when the
frozen water melts. PEX gets this ability from the cross-linking process which
makes PEX much more stronger than regular plastic pipe.
Steve
http://www.AirstreamDreams.com
Philip Piper wrote:
> I looked at all plastic
> but it costs 3 times as much and being an old timer I just don't like
> plastic pipe under pressure.
>
> ----Original Message Follows----
> I am trying to redo the plumbing in my as but it is a total mis-mash of
> parts. Nothing fits. I have some quest and some copper tube. The copper tube
> going to the sink is to very slightly different sizes. one barely fits a 3/8
> flair nut. the other not at all, but it is two small for a 1/2 flare I tried
> quest fittings and had the same problem I have 3 sizes of copper tube and
> only one seems to be a standard size, and then not really. What a joke. I am
> so mad I could eat tacks. I have never encountered anything like it before.
> I am tempted to put the Mickey mouse arrangement of plastic and vinyl
> tubing and hose clamps back in.
> Ron
>
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