Roth Pump Co. recently supplied a a reactor charge pump for a Midwestern polymer chemicals plant. Many years ago the service was handled with a Roth regenerative turbine pump. In recent times the plant had used a gear pump for the job. However, the gear pump did not last long in service. The fluid was a water-based solution.
When a call was received for a new Roth pump, the plant was making do with an air-diaphragm pump. Hose nuisance and operating costs were a problem. Since the reactor typically operated at 10-15 psig, it seemed that this was not much of a turbine pump application.
However, on a visit to the plant, it was learned that:
With the variation in reactor pressures, and the variation in friction head, a centrifugal pump would likely need a control valve to modulate the flow, so that the flow rate was similar in all circumstances. The Roth turbine pump is able to pump a flow rate suitable for the service without the use of a control valve.
What can be learned?
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