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Mechanical  Seals
Cavitation

Mechanical Science Volume 1 of 2
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Pumps DOE-HDBK-1018/1-93 CENTRIFUGAL PUMP OPERATION CENTRIFUGAL PUMP OPERATION Improper operation of centrifugal pumps can result in damage to the pump and loss of function of the system that the pump is installed in.   It is helpful to know what conditions can lead to pump damage to allow better understanding of pump operating procedures and how the procedures aid the operator in avoiding pump damage. EO  1.3 DEFINE  the  following  terms: a. Net  Positive  Suction Head  Available b. Cavitation c. Gas binding d. Shutoff  head e. Pump  runout EO  1.4 STATE   the   relationship   between   net   positive   suction   head available   and   net   positive   suction   head   required   that   is necessary  to  avoid  cavitation. EO  1.5 LIST   three   indications   that   a   centrifugal   pump   may   be cavitating. EO  1.6 LIST   five   changes   that   can   be   made   in   a   pump   or   its surrounding  system  that  can  reduce  cavitation. EO  1.7 LIST  three  effects of  cavitation. EO  1.8 DESCRIBE    the    shape    of    the    characteristic    curve    for    a centrifugal  pump. EO  1.9 DESCRIBE  how centrifugal  pumps are protected  from the  conditions of  dead  heading  and  pump  runout. Introduction Many centrifugal pumps are designed in a manner that allows the pump to operate continuously for  months  or  even  years.    These  centrifugal  pumps  often  rely  on  the  liquid  that  they  are pumping to provide cooling and lubrication to the pump bearings and other internal components of the pump.   If flow through the pump is stopped while the pump is still operating, the pump will no longer be adequately cooled and the pump can quickly become damaged.  Pump damage can also result from pumping a liquid whose temperature is close to saturated conditions. Rev. 0 ME-03 Page 11







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