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Flow
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- 2. Basic Flow Measurement Many methods of flow measurement Bernoulli’s Equation – A statement of energy conservation 1 2 p + ρv + ρgy = constant 2
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- 4. Orifice Plate Orifice Plate Flow Sharp Edge Bevel High Pressure Low Pressure Sensing Line Sensing Line
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- 6. Beveled Edge onOrifice
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- 10. Pro’s and Con’s High delta P High pressure loss Lots of data Erosion Low cost Easy replacement
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- 20. Output of theTransmitter ∆P
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- 22. Flow Loop withSquare Root Extractor
- 23. Extractor at LowInputs
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- 25. Effect of ProcessConditions Flow measurements are inferential – Measure a pressure drop and infer a flow Affect by density of the fluid – Temperature – Pressure – Increasing density increases the indicated flow rate
- 26. Density Compensating Flow High Pressure Sensing Line RTD Low Pressure Sensing Line DP Cell Pressure Cell Logic 4-20 mA Output
- 27. Flow Measurement Errors Erosion Over ranging the D/P cell Vapour formation in the throat Clogging Plugged or leaking impulse lines
- 28. For you todo Read pp. 18-32 Answer Questions pp. 82-85, #6-14