Poly pipe is almost never used in my locale. Not sure why, but could be the smaller properties are not suitable to a pipe puller, frost depth is like 1 inch, rocky soils, steep hillside properties etc. I do use it for certain jobs but my experience is limited. So I am looking for advise on a job we recently used poly that is causing me a few headaches. We recently installed irrigation for a streamside rehabilitation project. I love this work, it's partially federally funded (thank you tax dollars going back into my pocket!) This project used about 30,000 feet of regular 5/8 dripline fed by a couple thousand feet of 3/4" and 1" poly mains fed from a creek. Everything is above ground installed on the surface, as it is intended to be a three year system to get the native replantings going, then removed. I chose poly as the mains because it is flexible to go over varied terrain and stronger than drip tube, because there is a lot of maintenance with line trimmers and blade trimmers. I used Spear's insert barbed fittings for all connections with Oetiker clamps. I got a call six weeks after installation that a few poly mains had blown out of their fittings. What I found was that whereever the fittings had been sitting on the ground in full sun, they had heated up so much that the tubing was loose and the poly could easily be rotated and pulled off by hand. A few had blown out. So on my dime we went through the entire system and added an additional worm gear hose clamp to every barbed fitting connection. In retrospect, I could have easily just buried every fitting with some dirt to block the sun and it probably would have been fine. But I'm not sure, because the rest of the thousands of feet of poly sits there in the full sun; the temperature of the water when it first comes out is scalding probably 150 degrees. So this hot water may also be leading to expansion of the tubing around the fittings. Max pressure in this system is about 48 psi. Any thoughts are welcome.