Happened ages ago, taken this long for me to come to terms with and share my stupidness 
Decided to finally get some central heating involved in my life, being a fairly competent DIYer and up for a challenge I decided to do most of the work myself...
Radiators all hung, floors up, pipework in upstairs and downstairs, HW feed sorted, immersion heater chopped out, everything run to intended position for boiler, nothing too complicated just time consuming!
Being cautious I thought I'd do a little pressure test before reinstating all the floors just in case - dry testing in a no-no so thought I'd hire a pressure test pump and check for any leaks, pretty sensible so far.
Sitting downstairs with 5 pipes in front of me - flow & return to upstairs, flow & return to downstairs, HW feed. Thought I'd start with upstairs, capped off return, connected pump to flow and starting filling....got to 1bar, run upstairs, no leaks, keep pumping, omg getting a bit hard to pump, keep going, 2bar, heard a creak from upstairs must just be a radiator settling on the mounts, checked still no leaks, all good.
At this point common sense should have kicked in and I should have starting questioning how DAMN HARD it was to keep pumping but I ploughed on to 2.5 bar until there was a loud pop upstairs and I ran up to find water jetting out of the middle of one of the radiators
Seems I was reading the scale in Mpa instead of Bar, absolutely amazed that not a single joint failed at around 25 bar, the first thing pop was a brand new radiator!
Downstairs tested fine afterwards at 4.5 bar
Decided to finally get some central heating involved in my life, being a fairly competent DIYer and up for a challenge I decided to do most of the work myself...
Radiators all hung, floors up, pipework in upstairs and downstairs, HW feed sorted, immersion heater chopped out, everything run to intended position for boiler, nothing too complicated just time consuming!
Being cautious I thought I'd do a little pressure test before reinstating all the floors just in case - dry testing in a no-no so thought I'd hire a pressure test pump and check for any leaks, pretty sensible so far.
Sitting downstairs with 5 pipes in front of me - flow & return to upstairs, flow & return to downstairs, HW feed. Thought I'd start with upstairs, capped off return, connected pump to flow and starting filling....got to 1bar, run upstairs, no leaks, keep pumping, omg getting a bit hard to pump, keep going, 2bar, heard a creak from upstairs must just be a radiator settling on the mounts, checked still no leaks, all good.
At this point common sense should have kicked in and I should have starting questioning how DAMN HARD it was to keep pumping but I ploughed on to 2.5 bar until there was a loud pop upstairs and I ran up to find water jetting out of the middle of one of the radiators
Seems I was reading the scale in Mpa instead of Bar, absolutely amazed that not a single joint failed at around 25 bar, the first thing pop was a brand new radiator!
Downstairs tested fine afterwards at 4.5 bar
