Originally Posted by FlightPlan
But what do I know, I was a lowly licensed mechanical and plumbing
contractor for thirty five short years.
OK, I'll play this game
I figured you were a contractor, as the pex expansion tool is a bit spendy for the typical homeowner, and you were posting
quite correct information. I respect contractors as there is tons more to installing piping, then drawing lines on paper.
Myself, I'm just a lowly plumbing/piping/fire protection engineer
, also with 35 years experience and have designed and specified plumbing/ hydronics for buildings, where the plumbing
cost alone was $40 million+. I also do steam and chilled water
and have designed large CUB's (central utility buildings) and have worked with bioitech, semiconductor as well as a few tiny buildings on the strip in vegas.
Passed the CIPE back in 83 and PE in 95 via experience. I read design manuals
and manufacturers data, just for kicks and giggles. I wrote hydraulic analysis software
with cad input and output and 3d rotation display, back in the early 90's, after teaching myself C/C++, just for fun. Strange girl I know....
When i rejected a submittal for piping/fittings, I would give the reasons why explaining the point of failure, in detail. Sometimes contractors would install the piping system anyway. In all cases, where i said it would fail, it did.
Sometimes it was the material that was not comparable with the system pressure. Sometimes the jointing system that created a stress riser in copper. Sometimes it was their in house engineers that missed a few things when calculating head
I'm not just a blonde bimbo. I'm a blonde bimbo engineer
I like pex. It's good stuff. But if you were to pull a section of that buried pex and tested it againsted new material, you would find that the pex that went through multiple freeze thaw cycles, where the water
streached the plastic, that the yield point would be lower then for new piping. It's probably not a problem with an open system or even many closed systems, but it's not unaffected by cold either. Under some conditions after multiple freeze thaw cycles it can freeze