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Control system improves screw pumps
Allweiler has developed a new control system to help regulate the speed of its screw pumps.
Allspeed uses a proprietary control algorithm which adaptively controls the associated frequency converter in real-time so the pump can adjust to changing conditions at individual tools at less than 500 ms. Speed jumps of up to 5,000 1/min and pressure differentials of up to 120 bar can be achieved and the pump can approach the tools'
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An entirely new series of Sterling SIHI single-stage chemical pumps, specifically designed to provide an efficient and economical solution to the problem of dealing with low throughputs up to 12 m3/h, has been introduced by Sterling Fluid Systems.