Pumps operating in parallel take their suction from a common header and discharge into a common discharge. At a head of 1200 ft, the capacity of each pump is 1000 gpm. Centrifugal pumps are used frequently in multiple pump installations where the pumps are piped to the same suction and discharge lines. Putting your pumps in parallel, or connected to any number of line branches so that each handles a division of the flow, will help you reach a low head, high flow operating point that a single pump …
Pumps in In order to increase the volumetric flow rate in a system or to compensate for large major or minor losses, centrifugal pumps are often used in parallel or in series.. However, regarding the resulting pressure pulsations and energy consumption, this operation mode has so far not been in the focus of scientific studies. The total flow rate in the system is the total of the flow rates of the individual pumps which can be different from each other. The combined flow rate is the summation of the individual pump flows at the same TDH. 2.
Parallel operation of centrifugal pumps is used to increase flow rate through the system. In industrial plants, centrifugal pumps are frequently operated in parallel configuration, not least for redundancy and operational reliability reasons. Parallel operation of centrifugal pumps is used to increase flow rate through the system. Efficiency of pumps in parallel operation on long-distance water pipelines Alex van der Spek Consultant, Zdoor BV, The Netherlands Robert Maron*, Americo Zuzunaga CiDRA Minerals Processing, Wallingford, USA ABSTRACT Mining operations in the high mountains increasingly rely on water being pumped up from sea level for their process needs. In parallel operation the capacities for each pump are added at any given head.
This document is necessary for design parallel and series pumping systems. RE: Parallel operation of VFDs on centrifugal pumps, jraef (Electrical) 30 Sep 02 14:20 As mentioned by others, running both motors at the same output from the same flow signal is better than running one up, then adding #2 with 2 vfds. Parallel Operation of Centrifugal Pumps. If two centrifugal pumps I and II are operated in parallel, the flow rate QI+II is the sum of the flow rates of the individual pumps … The flowrate Qt is split between the inlet into Q1 and Q2. All calculations are performed thanks to the pump characteristics established by the supplier. 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. 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. While head changes only slightly, flow is almost doubled at any given point. It must be noted the volumetric flow rate is actually less than twice the flow rate achieved by using a single pump. Future process plants may be able to use sea … With pumps in parallel, the flow rates are additive with a common head. Reliability of parallel and serial centrifugal pumps for dewatering in mining process Mohammad Emal Qazizada1 and Elena Pivarčiová1 In the mining process, besides the semiliquid mixture, mud, slurry, and rocks, there are large volumes of water to remove in order to keep production moving. In theory, if the two pumps and piping are identical in design, they should pump at approximately the same flow rate. Parallel, or series operation A parallel operation is one where two, or more, pumps are connected such that the pumps take their suction flow from a common source and discharge into a common header or tank. Parallel operation is a setup in which two or more pumps take suction from the same suction header and deliver liquids into the same discharge header. Each pump develops the same head H at the corresponding capacity. Parallel operation, or parallel pumping, of two centrifugal pumps is a mode which allows pump operation to be controlled by starting or stopping one of the two pumps. Pump in Parallel. A typical pump characteristic curve is represented below, for a centrifugal pump. Pump parallel and series operation guide How to operate pumps in parallel or series ? The combined H-Q curve in parallel operation is labeled in the figure as two pumps in parallel. Therefore, in combination, the parallel pumps will be capable of pumping 2000 gpm, generating a common head of 1200 ft. Every point on the combined H-Q curve has a capacity double that of each pump at the same head.
Series operation means that pumps are connected and started one after another, i. e. in series.