Pumps are sometimes installed in parallel in pressure booster systems for water supply and for water supply in large buildings. So, for each value of the head, the flow is double that of a single pump in operation. As the pumps, in this case, are identical, the resultant composite pump curve has the same maximum head value, H max but the maximum flow Q max is twice as large. The total system performance curve for parallel pumps can be determined by adding Q 1 and Q 2 for every value of head which is the same for both pumps, i.e. This is to prevent bypass circulation when a pump is not running. The image shows how non-return valves are installed in series and downstream of each pump. The pumps however can be of a different size or the pumps can be speed-controlled which of course means the pump performance curves will be different.įigure 1 provides an illustration of a system with two identical pumps installed in parallel. Typically, pumps installed in parallel are of a similar type and size. Pumps are often installed in Parallel in systems which exhibit considerable variations in flow or when the system has variable flow requirements and when these requirements can be achieved by switching the parallel pumps on and off.
0 kommentar(er)
