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Variable Frequency Drives: An Algorithm for Selecting VFDs for Centrifugal Pumps

By D. K. Shukla and D.K. Chaware, Essar Oil Ltd. R. B. Swamy Litwin PEL LLC |

This article describes an algorithm that end users can use to develop a program on a personal computer to assess the technical and economic feasibility of installing a variable frequency drive (VFD) on centrifugal pumps. This simple algorithm serves a variety of useful functions, helping engineers to carry out the following functions: Check the technical feasibility and evaluate whether or not it is advisable to use VFD Such an evaluation is useful for operators considering both (a) the re-rating of pumps already in operation, and (b) the deployment of other, perhaps redundant pumps that may be warehoused at the facility. During plant expansion and debottlenecking activities, operating parameters are commonly revised, and this calls for either the re-rating of existing equipment, the deployment of surplus equipment that may be warehoused at the facility, or the purchase of new equipment. Generally speaking, plant operators prefer to avoid new equipment purchases, which can be time consuming and costly, and instead prefer to look for opportunities to re-rate existing and available equipment at the plant. The addition of a VFD provides one option for re-rating centrifugal pumps to help users gain better control and to help the units…
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Andritz

PTA production: Lowering OPEX without compromising on quality

A paper that looks at how the earlier PTA production method involving a multi-stage process with pressure and atmospheric centrifuges and a re-slurry tank can be replaced with one stand-alone device – the rotary pressure filter (RPF).

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