I/O Bulletin 66. 



4 



An important factor in centrifugal separators is the amount of 

 power required. This becomes an important item in the waj^ of 

 fuel consumption in factories doing a large business and using the 

 larger power sizes. It is no less an important factor in muscle 

 consumption in those machines that are intended to be run by 

 hand. In order to get some data on this point, cooperation of the 

 Mechanical Department of the University was asked and through 

 the kindness of Prof. R. C. Carpenter, Messrs. L- S. Marks and 

 S- H. Barraclough, graduate students of the Department of Me- 

 chanical Engineering, were detailed to make the test of the power 

 required bj- the various machines. This work was done after the 

 close of the term of the Dairy School and was carried on in a most 

 careful manner by Messrs. Marks and Barraclough, both of whom 

 have had large experience in similar work. Their Report in full 

 is inserted herein. 



Report on the Power Required to Drive the Cream Separators 

 AT THE Dairy Building, Cornell University. 



We have, at your request, made a series of tests to ascer- 

 tain the power required to drive each of the cream separa- 

 tors at the Dairy Building. Of these there are six; one being 

 driven b^^ a self-contained steam turbine, and the remaining five 

 by belting from a power shaft. The numbers refer to the num- 

 bers of the tables giving details of the various runs. 



(i.) The combined steam turbine and separator. The Standard 

 Russian, manufactured by P. M. Sharpies, of Westchester, Pa., 

 was tested in the following way for steam consumption. All 

 connections with the boiler, except that leading to the turbine, 

 were carefully closed. The turbine was then run for one hour, 

 working to its full capacity, and the weight of steam consumed 

 was noted by observing the level of the water in the gauge glass 

 of the boiler, weighing the feed water during the hour, and fin- 

 ishing with the same level in the boiler. As some leakage was 

 noticed from the steam pipe, trials for leakage of two hours' dura- 

 tion were made, and the observed loss has been subtracted from 

 the total steam consumption to obtain the amount actually pass- 

 ing through the turbine. The steam pressure at the boiler was 

 80 pounds by gauge; it was reduced to 40 pounds, by an au- 



