Are there any standard codes for determining the minimum flow pipeline of a centrifugal pump? Are there any centrifugal pumps installed?
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What are the standard codes for installing the minimum flow line of a centrifugal pump? Are there any centrifugal pumps installed?
Generally, high-head pumps require a low-flow line, with a capacity of around 30% of the normal flow rate
According to API 610, the minimum flow rate is determined based on two criteria: vibration and heat generation. In other words, by installing a minimum-flow return line, it is possible to avoid pump overheating and high vibration levels. Depending on the application, some pumps must have a minimum return line; in particular, process pumps related to level control require a return line. Pumps used in certain special applications require that no return line be installed, such as fire pumps. NFPA20 explicitly requires that no return lines be installed.
“Especially for process pumps related to level control, a return line is necessary – I’m not quite sure; could you explain that?