Parallel pumps push the process

Sundaram, Alagu
June 2004
InTech;Jun2004, Vol. 51 Issue 6, p32
This article presents a method to start and stop additional pumps to improve energy optimization of pumps that operate in parallel. The classical control system has several attributes. First, it has low energy consumption at high loads. Because the system adopts a variable speed drive (VSD) to control the speed of the pumps to vary the flow, the system is the most efficient when it operates at a load of 700-800 cubic meters per hour. Second, the system has low energy consumption at low loads. However, when the flow drops to less than 600 cubic meters per hour, the system still runs three VSD pumps and one fixed speed (FS) pump. Monthly maintenance can happen by running the FS pump and stopping the pump that needs work. Technicians can rotate the pumps to perform the upkeep on all the pumps. The system also has jerk-free and smooth transition of pumps during the rotation operation. The control system does this by capitalizing on the advantage of the VSD, which maintain pressure between 4.8 and 5.2 bar. It is usually a challenge for the control engineers to decide the proportional, integral and derivative parameters to achieve the performance. Good disturbance characteristics of the system, due to the availability of the FS pump, which triggers when the system drops to 4 bar.


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