Indicating a Steam Engine ~2,500 HP Triple Expansion~

Indicating the 2,500 Horsepower triple expansion steam engine on the WWII Liberty Ship "Jeramiah O'Brien".

The final step in the process that isn't shown is to use the drawn graph to calculate the average pressure within the cylinder (P) during the up and down stroke. That will go into the P.L.A.N. formulae where HP=PLAN/33,000

Indicated Horsepower=PxLxAxN divided by 33,000 (the number foot pounds per minute determined by James Watt)
P= Pressure (average in pounds per square inch PSI)
L= Length of stroke in feet (up and down = one revolution. i.e. 3" stroke up and down = 6" or 0.5ft)
A= Area of the piston in square inches
N= Number of strokes per minute

This process is done so the engineer can adjust the valves to balance the horsepower on the up and down stroke of the cylinders. It is also done to balance between all cylinders on multi-cylinder engines (in this case a three-cylinder triple-expansion) to ensure they are all making the same amount of horsepower.

To learn more about the S.S. Jeramiah O'Brien, visit:

https://www.ssjeremiahobrien.org/

To learn more about Steam Boats, visit:
http://www.thesteamboatingforum,net/forum/
http://www.steamboatassociation.org.uk/
http://www.northweststeamsociety.org/
http://www.steamboat.com.au/
http://www.spiretech.net/~artemis/NASAhome.htm

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Filmed and narrated by my father, Steven Harcourt, and uploaded with his expressed permission.

Видео Indicating a Steam Engine ~2,500 HP Triple Expansion~ канала The Steam Nut Wesley Harcourt