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MJM, thanks for this explanation and the thermometer is now reading the same both in and out of the boiler !! However i was surprised that it took 15-17 hours to reach equilibrium !! is this a record ? So let us continue with engines now.!!.....[/quoteHi the next time i have 15-18 hours spare i may do the same experiment again and record the first 5 hours , and the remaining 5 hours to complete the graph !! So...with locomotives that stopped running at 11 Pm and then brought back into service the next morning to start running again say about 5 hours ,the boilers must still have been quite warm. And is there any data for this available ?
Every steamship I have served in has hand easing gear for the safety valves. If the ship is sinking then releasing boiler pressure lessens the chance of an explosion when the flooding water reaches the boiler(s). i.e. it's part of the abandon ship routine.Regards Bob