Hi All
I'm sure there'll be someone on here who can answer this.
I have taken a radiator off the wall, and taken it for powder coating as it's a pain to paint. To stop it dribbling rusty water into the car I put a couple of old radiator valves on the ends. I didn't mention it at the powder coater's and remembered on the way home and thought - "They're bound to vent it for safety's sake."

Unfortunately the radiator appears to have swollen during powder coating, the spot weld dimples are deeper and it won't fit on the radiator brackets. The powder coaters say they are sure they vented it. The powder coating on the valves and bleed screws disagrees.

My question is what pressure could it have reached during the powder coating process? The numbers that I think are needed are:

Radiator internal volume = 12.8 litres
Powder coating oven temperature = 200 degC
Quantity of water left in radiator = 100 mls approx
My thinking is - if there is enough water it'll boil until it reaches the pressure at which the boiling point is 200 degC - but is that affected by the low volume of water compared to the volume of the radiator. I think that there will be an effect from the expansion of the initial quantity of air - but that's effectively cancelled out by the effect of it's pressure on the boiling point.

I'd be grateful for any advice.
Russell