I have seen it before, but as we waited for power to be restored (8 hours) the Biomas Boilers, started to produce steam. Pipes started to hammer, vibrate, bounce and relief valves did their job and blew off.
On and off for 5 hours.
Long day at work getting the system back on line and in control.
On the plus side, Mrs away to Glasgow to a Placebo concert, so weather permitting...........................
