Throttle orifice plate problem
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I would like to ask everyone: generally, a return pipe is installed at the outlet of a centrifugal pump, and a throttle orifice plate is placed on this return pipe. What is the purpose of installing such a throttle orifice plate? Software used for selecting throttle orifice plates generally requires the pressure after the orifice plate; how is this pressure determined? How to choose such a throttle orifice plate, and what size of orifice is appropriate? Thank you
Generally speaking, the pressure behind the orifice plate is determined based on the amount of pressure that can be allowed to be lost across the orifice plate. If the pressure upstream is 2 Bar and at least 1.5 Bar is required downstream to meet design specifications, then the orifice plate should not allow more than 0.5 Bar to be lost. Of course, in my own designs I usually rely on empirical values for the pressure difference (setting it at 1250, 2500, or 5000 mm of water column height) to decide which option to use; the resulting Beta Ratio falls between 0.25 and 0.75, which is the desired value
At this point, orifice plates are used primarily to ensure a minimum flow rate. By using the minimum flow rate along with the pump’s performance curve, the head required by the pump at that minimum flow rate can be determined; from this, the pressure before the orifice plate can be calculated. The pressure behind the orifice plate is the pressure in the inlet container, and once these values are known, the orifice plate can be designed. Note that accurate calculations should also take into account the pressure loss in the pipeline.
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What software or formulas are used to calculate orifice plates? What kind of data is the beta ratio? Is it the orifice throat diameter divided by the pipe inner diameter?