34 



M. S. GORDON AND R. A. BOOLOOTIAN 



ACKNOWLEDGMENTS 



Continued successful operation and 

 maintenance of this system would not be 

 possible without the able cooperation of 

 the UCLA Department of Buildings 

 and Grounds. Assistant Chief Engineer 

 John Little was largely responsible for 

 the expert and expeditious solution of 

 many problems which arose during the 

 difficult early "shake-down" stages of the 

 operation. 



ADDENDUM 



In the time since this paper was sub- 

 mitted, new developments have occurred 

 in pump technology which have revised our 

 opinions concerning centrifugal pumps. 



Several very efficient, reliable, nontoxic 

 centrifugal pumps adequate for the needs 

 of the UCLA system have appeared on the 

 market. The two main supply pumps and 

 one of the filter pumps in our system have 

 been replaced with these. The casings and 

 the impellers of these pumps are made of 

 one of several types of epoxy resin. One 

 of these pumps (a Series P Durcopump, 

 manufactured by Duriron Co., Inc., Day- 

 ton, Ohio, powered by a 3-horsepower 

 motor) has now (December 1963) been 

 used continuously as the main supply pump 

 for the system for over fi/^ years. There 

 has been no down time, and the pump has 

 required only routine maintenance. 



