I used to do boiler inspections on various types of boilers, from those at Ferrybridge and Drax power stations, to the boilers in coffee shop espresso machines, via boilers in breweries and soap manufacturers. All boilers have a safe working pressure or design pressure marked on them, a pressure that must not be exceeded. There is a myth that when the safety lifts, you are allowed to have a 10% increase in pressure. This is not true, there must be NO accumulation of pressure above the design pressure of the boiler. On the odd occasion I have seen a plate marked with a working pressure and a design pressure, with the DP being higher than the working pressure, in which case I would want to see the safety set slightly above the WP and would not expect the boiler to accumulate above ths DP. I did have a coal boiler in a dairy, that accumulated above the DP by quite a margin, I had to issue a notice for it to not be used untill they fitted a higher capacity safety valve. It must have been like that for 15 odd years, no one had checked to see if it accumulated once the safety had lifted.
I'm looking forward to seeing you get 100,000 subscribers.
I like the bolted on tractor tyres.
Thanks John.
Very exciting. I hope to either get hold of or build a boiler at some stage. Also I would love to get hold of a traction engine. Great video. Thanks
I used to do boiler inspections on various types of boilers, from those at Ferrybridge and Drax power stations, to the boilers in coffee shop espresso machines, via boilers in breweries and soap manufacturers. All boilers have a safe working pressure or design pressure marked on them, a pressure that must not be exceeded. There is a myth that when the safety lifts, you are allowed to have a 10% increase in pressure. This is not true, there must be NO accumulation of pressure above the design pressure of the boiler. On the odd occasion I have seen a plate marked with a working pressure and a design pressure, with the DP being higher than the working pressure, in which case I would want to see the safety set slightly above the WP and would not expect the boiler to accumulate above ths DP. I did have a coal boiler in a dairy, that accumulated above the DP by quite a margin, I had to issue a notice for it to not be used untill they fitted a higher capacity safety valve. It must have been like that for 15 odd years, no one had checked to see if it accumulated once the safety had lifted.
Getting close John....
brill