Practical Considerations in Pump Suction （在泵吸实际考虑）.pdf

PDHonline Course M134 (3 PDH) Practical Considerations in Pump Suction Arrangements Instructor: Randall W. Whitesides, PE 2012 PDH Online | PDH Center 5272 Meadow Estates Drive Fairfax, VA 22030-6658 Phone Fax: 703-988-0088 www.PDH www.PDH An Approved Continuing Education Provider www.PDH PDH Course M134 www.PDH Practical Considerations in Pump Suction Arrangements Copyright © 2003, 2008 Randall W. Whitesides, P.E. Course Overview An important aspect of pump hydraulic system design is the suction or inlet conditions. Disregard for proper allowances can result in vortices, cavitation, and loss of prime. Pumps do not force liquids through inlet or suction piping, but rather create lowered pressures at the suction nozzle which in turn in- duces the fluid to enter. Any design that impedes or lessens the efficient transport of this liquid will, of course, result in less liquid being handled. Any design that encourages the introduction of entrained gas or liquid voids will likewise result in a less efficient pumping operation. In addition to poor performance, truly bad designs can in some cases actually result in physical damage to the pump or its parts. The study of pump suction system configuration can be broken down into two parts: (1) suction piping and (2) suction source. Critical consideration must be given to both in order to properly design an effi- cient system. Proper suction piping design and installation considerations consist of pipe and pipe fittings and their relationship, quantity, and relative locatio