Many of today’s pumps are installed to operate under variable flow conditions, so understanding the concept of parallel pump control is a must. If the failed pump is Pump-B, then Pump-A would suddenly have a serious System Resistance causing its flowrate to be very low or even zero. Two typical options include Centrifugal pumps in parallel are used to overcome larger volume flows than … In addition, if the control head is high, even more energy is saved with the parallel pumping system. Pumps in parallel operation with the same head. This article defines Centrifugal Pumps, shedding light on the working, application, and types of Centrifugal Pumps and shall help you buy the most suitable one for your process. Since parallel pumps are applied with smaller motors to better match part load, the savings potential is enhanced. Centrifugal Pumps are the most widely used type of pump for the transfer of liquids. If the pump curves are flat at low flow, minor variations in head can cause wide variations in flow, making it difficult for the pumps … Unstable pump curves in parallel pumps can cause surging. So the combined pump curve only intersect the system curve at 4 & 5 pumps operating. Flows Q1 and Q2 combine, and that is what flows through the valve: Q VALVE = Q1 + Q2

Parallel operation is most efficient with steeper pump curves to help share the load at low flows. For some piping system designs, it may be desirable to consider a multiple pump system to meet the design requirements. Parallel Pumping can be a … This point will be the operating point of a single pump.

By Ron Astall, United Pumps Australia Centrifugal pumps are frequently operated in parallel to achieve higher system flows, to enhance system flexibility or to provide greater pump redundancy and hence better system availability. Basically, pumps in series will give higher head and pumps in parallel would give steady discharge. When Pumps are operating in Series, the effects of Pump failure is more serious than Pumps which are set to operate in Parallel. Please try again later.

Parallel pump curve construction for an open system is similar to the procedure used for closed systems.

The information provided in this document is given in good faith, but Alfa Laval is not able to accept any responsibility for the accuracy of its content, or any consequences that may arise from the use of the information supplied or materials described. The final example in this book combines parallel, series, and variable speed pumping for optimal energy savings. At a head of 1200 ft, the capacity of each pump is 1000 gpm. A typical example of this arrangement side of the second pump (Figure 13). examples in this book will show how to employ pumps in parallel or in series while avoiding the pitfalls that sometimes entrap a careless designer. For very large projects, limited availability of sufficiently large pumps or limits on driver size or electrical starting current may dictate the use of multiple pumps. Experiment (10): Series and parallel pumps Introduction: Centrifugal pumps are often used together to enhance either the flow rate or the delivery pressure beyond that available from the single pump. When we say multiple pumps are in parallel, the flow to the suction is split depending on the number of pumps in parallel and when the individual discharge connections from the individual pumps in parallel unite to form a common discharge pipe or discharge header the flow recombines as a summation of the individual pump flows. In simple words, it is a pump that uses a rotating impeller to move water or other fluids by using centrifugal force. However, very little is gained (+6%) by operating both of these pumps in parallel, while the energy effectiveness (gpm/kW) is reduced by 30% and 10% respectfully. If the pump curve and a system curve are plotted together, an intersection determines the pump's operating point because it belongs to both curves as shown in Figure 3.

Pumps operating in series Pumps operating in parallel To connect two pumps in series means that the Figure 15 presents a parallel configuration of discharge from the first pump is piped into the inlet two pumps. To receive the flow of every pump it is necessary to divide overall flow on the number of pumps. At single, double and triple pump operation the system is well below the pump curve (way to the right).

With pumps in parallel, the flow rates are additive with a common head. Problem Solving - Centrifugal Pumps . It ran into both a common problem and a more unusual one.

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