Study on Surging of Centrifugal Pumps (6 th Report) : Experimental Study of Series-and-Parallel Running

Abstract

To verify the adequacy of the theoretical results described in the previous report, the authors studied experimentally on surging of pumping systems in series-and-parallel running. The results showed that the experimental results coinsided with the theory, and the following three conditions were essential to the occurence of the surging of pumping systems : (1) Rising characteristics of the relation between resultant head and discharg. (2) The existence of air tank, liquid tank or air chamber in pipe lines. (3) Valve which controls the pump discharge, is located after (downstrean) the air tank etc.