Steam Boilers, Engines, Nozzles and Turbines
In natural circulation type boiler,

Feed pump is employed to supplement natural circulation in water wall type furnace
Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Water is converted into steam in one. Pass without any recirculation

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Steam Boilers, Engines, Nozzles and Turbines
The cylinder dimensions of a compound engine may be designed on the basis of

All of these
Equal temperature drop in each cylinder for economy of steam
Equal power developed in each cylinder for uniform turning moment
Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders

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