There is a copper insert.The fitting is touching the joist could the heating and cooling over time or caused the fitting to unscrew?
I.e not tightened the fitting?Or it could of being the Plumber not doing his job correctly.
Andy
it mustve been had cutting off those 3 teethActually not! some years ago we had a 15mm grey poly elbow fail after around 3 months.
Open vented system elbow failed over night large amount of decoration damage to ground floor plus carpets.
When you looked at fitting in effect 3 of the grab ring teeth were missing.
All costs (including ours) paid by polpipes insurers.
18bar is pretty highIt wasn't tested to 18 bar I know poly say to do this I do on new builds but on domestic central heating install It hasnt been.
If that was the case surely they should say not to use copper and poly together on a tee section. Was done to save fittings on the pipe leaving to the rad. It's 15mm copper bent straight up to the rad. Valve. As appose to 15mm poly, poly elbow and copper to rad valve.There is a copper insert.
Dunno if this is relevant here but micro strains between different materials in a pipe junction can cause havoc over time.
Plastic expands at a greater rate than copper.
If the plastic has expanded faster than the copper then the junction looses its tightness. In this configuration, perhaps it waa loose enough to undo over time as the fitting rails up and down the beam during cycling.
Maybe.
If that was the case surely they should say not to use copper and poly together on a tee section. Was done to save fittings on the pipe leaving to the rad. It's 15mm copper bent straight up to the rad. Valve. As appose to 15mm poly, poly elbow and copper to rad valve.
18bar is pretty high
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