Using the failure rate data in Table 10.1, evaluate the reliability and mean time between failures for
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Table 10.1 Failure Rates for Selected Components (Mannan, 2012) Failure Frequency (faults per year) Instrument Control valve 0.60 Valve positioner Current/pressure transducer 0.44 0.49 Pressure measurement 1.41 Flow measurement (fluids) Orifice plate and DP transmitter Magnetic flowmeter Temperature measurement Thermocouple Mercury-in-steel thermometer Controller (electronic) 1.73 2.18 0.52 0.027 0.29 Flow switch 1.12 Pressure switch 0.34 Alarm indicator lamp 0.044 Gas-liquid chromatograph 30.6 PT Coolant hD LT AT Distillate D Feed Reflux R LT Heating medium Яh AT Bottoms хв Figure E10.4
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Related Book For
Process Dynamics and Control
ISBN: 978-1119385561
4th edition
Authors: Dale E. Seborg, Thomas F. Edgar, Duncan A. Mellichamp, Francis J. Doyle
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