Thanks for the input, interesting though. The site this is at is an agriculture dept. site and the recommended fix from my contractor is steel! Both of you hit it (sort of) on the head. The reason the temp got up so high was a 125kw motor recircing a 10", about 65 foot loop, with the...
Recircing a well insulated chill water loop recently overnight resulted in loop temperature at 170 degrees F at probably 50-75 psi in a ten inch PVC pipe (part Schedule80 other part, 1120 sdr-26). It exceeded the 140 temp limit and even the 167 degree plastic point, and the piping bulged out...
