40k Pebble Pool with Spa Spillover
(2) Hayward Pro-grid 6020 DE filters
(2) Hayward pumps 1.5 hp, 1.60 sf, 2.4 thp
Hayward H series
TF-100 test kit
My guess is that the flow was completely blocked somehow, and the water in the pump and connected pipe seriously overheated, weakening the PVC. With flow completely blocked, the pressure would be roughly 40 psi, and with the pipe weakened from the heat it could easily fail. That doesn't tell us where the blockage was however.
Any chance freezing blocked the line and caused it to overheat like Jason said?
18' x 36' saltwater inground vinyl pool
Yeah, that got hot!
IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
www.tftestkits.net Experience- it's what's learned just after you needed it most !!
I had a similar thing and mine was caused by the failure of a check valve between the pump and filter. It was the flap type valve and the flap tore loose and got wedged so that it blocked the water flow. I don't see a check valve in your set up but, I agree something blocked the water flow causing the water to overheat. Block that flow long enough and the water will boil.
19k gallon Pebble Tec play pool/spa, Pentair Intelliflo VS (3 hp) 011018, Super II 2hp (for spa), Aqua Rite T-15 SWG, Pro Grid 60 DE filter, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit
Awful plumb job and pump running dry (heat)