The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

Newest Clyde Liner the S. S. Iroquois Equipped with Electric Auxiliaries ectric Auxiliaries Increase Steamship Operating Efficiency HE use of electric auxiliaries H on ships followed naturally the introduction of diesel engines for propulsion. It was early found to be uneconomical to provide a sepa- rate steam plant for the auxiliary load, so that at the present time electrified auxiliaries for motorships are the accepted standard. And although fuel economy has been the predominating factor in this adoption of electric power, experience has shown the value of many other fac- tors, Vessels converted from steam to diesel propulsion where the original steam auxiliaries, either deck or en- gine room, have been retained with part of the steam boiler plant in order to save the cost of diesel gen- erating sets and new electrically driven auxiliaries, have proved so relatively uneconomical in auxiliary operation that this practice has not been repeated. Actual comparisons of fuel econ- This’ article was especially prepared for MARINE ReEview by the author, E. F. Clark, of the Westinghouse Electric & Mfg. Co. 36 By E. F. Clark omies between similar ships with diesel electric and steam auxiliaries respectively, show for fuel consumed in port a. ratio of 15. te 1 in- favor of the diesel electric, with cases where the ratio has been as high as 33 to 1. Similar comparisons of the fuel consumed at sea for the auxiliaries that are comparable (eliminating the condenser pumps, boiler feed pump, boiler room auxiliaries and evaporator of the steamship) show a ratio of ap- proximately 10 to 1 in favor of the diesel electric. The foregoing economies are re- sponsible for a present day tendency to install diesel electric power for auxiliaries on steamships and_ this is now being followed out on a num- ber of new steamships abroad. ‘The principal advantage at sea lies in the saving of power supplied to the inefficiently operating auxiliaries, the absence of auxiliary steam and ex- haust piping and the general con- venience and simplicity of the electric motors and control. Auxiliary steam requirements for MARINE REVIEW—August, 1928 feed water heating and study of heat balance sometimes show that overall economy is in favor of elec- tric auxiliaries with power furnished by turbine generators rather than diesel generators. In port, however, the diesel generator will show a very distinct gain in economy, especially if the steam boiler plant may be shut down. Whether to install diesel or turbine driven generators, or a combination of both, for the electric auxiliaries of a steamship is_ there- fore a problem involving the relative port and sea auxiliary loads which requires a careful study for each installation. Steam Electric Auxiliaries Experience gained from electric auxiliary installations on steamships to date and economic studies made by Westinghouse marine engineers show, generally speaking, that economies re- sulting from such installations will more than repay their extra first cost. The major portion of engine room auxiliaries and the steering gear