"The Titanic’s propulsion system consisted of two reciprocating steam engines and one steam turbine. The ship was equipped with 29 boilers that burned over 600 tons of coal per day to power the engines, generating a maximum combined output of over 46,000 horsepower."
"The Titanic was also equipped with state-of-the-art amenities like electric lights, elevators, and a wireless telegraph system, all of which required a significant amount of power to operate. The massive engines were able to provide this power efficiently, allowing the ship to carry out its luxurious and advanced features."
https://enginelearner.com/the-story-of-titanic-engines/
"A triple-expansion steam engine works by re-using steam that would otherwise be wasted as exhaust, like in a steam locomotive, or it would be returned to the condenser, to be turned back into water to be used again. This extracts the maximum amount of energy out of the steam, and also provides a better level of economy, using less coal, less firemen, less boilers, etc."
"1. Steam from the boilers, at 215 p.s.i., enters the small high pressure (HP) cylinder, moving the piston in the cylinder.
The steam exits the HP cylinder, and is routed to the next cylinder along, the slightly larger intermediate pressure (IP) cylinder, moving the piston in the cylinder.
The steam exits the IP cylinder, and is routed to the next cylinder along, the much larger low pressure (LP) cylinder, moving the piston in the cylinder. (On Titanic , each engine actually had TWO LP cylinders.)
The steam, at 9 p.s.i., was then passed to the turbine that powered the center propeller.
The steam is then passed to the condensers, where it is cooled, turning it back to water, ready to be passed to the boilers, where the whole process starts all over again.
All of the above process might seem long-winded, but in reality it only took a couple of seconds from the time the steam entered the first cylinder to the time it left the turbine."
"Operating Speed 76 r.p.m.
Operating Output 16,000 h.p.
Turbine Statistics
Operating Pressure 9 p.s.i.
Operating Speed 165 r.p.m.
Operating Output 16,000 h.p."
https://www.titanic-titanic.com/titanics-engines/