Understand the Basics of Centrifugal Pump …（了解离心泵的基本知识u2026）.pdf

Fluids/Solids Handling Understand the Basics of Centrifugal Pump Operation Kimberly Fernandez, By starting from such fundamentals Bernadette Pyzdrowski, as head and pressure, the authors have Drew W. Schiller and developed practical tips for specification Michael B. Smith, KBR and operation that provide for cost-effectiveness and reliability. entrifugal pumps are the most com- During specification, the maximum pressure a pump mon type of kinetic pump, and are will develop during any aspect of operation, including Cused most often in applications with startup, shutdown and upset conditions is determined. moderate-to-high flow and low head. The shutoff pressure is the maximum pressure a pump As the workhorse of the chemical process industries will develop under zero-flow conditions, which reflects a (CPI), centrifugals are almost always more econom- fully blocked outlet. Variables to consider when deter- ical to own, operate and maintain than other types mining the design pressure include: of pumps. • maximum pressure of the source (e.g., relieving pressure of a vessel) Parameters needed in specifying • maximum head developed by the pump (i.e., shut- The process engineer is normally responsible for off head) sp