I've been sent this...
QE2 23 October 1986
29 years ago to the day she was 2 days out of New York on her last transatlantic crossing under steam power.
It was the first time she had a heavy following sea that lifted the props out of the water which caused the turbine over speed trips to shut the steam stop valves, which causes a lot of operational problems like quickly reducing the fires on the boilers and steam safety valves lifting. Imagine producing 1,000,000 lbs. of evaporated steam per hour at 850 psi and 950f and then it reducing the requirement to 100,000 lbs/hr within a minute. where does the surplus steam go?, up the funnel by the boiler safety valves. An impressive sight and sound.
Then having to stabilise the plant before opening up everything again to get full power to the main turbines.