Consider the liquid storage tank with a low-level inter-lock, as shown in Fig. 10.4. Suppose that an

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Consider the liquid storage tank with a low-level inter-lock, as shown in Fig. 10.4. Suppose that an independent low-level alarm is added, with its set-point value above the value for the low-level switch. If both the low-level alarm and the low-level interlock system fail simultaneously, the pump could be seriously damaged. What is the probability that this occurs? What is the mean time between failures?

Failure rates (faults per year):
Solenoid switch:         μS = 0.01
Level switch:              Î¼LS=0.45
Level alarm:               μA = 0.3

PT - Coolant Яс LT AT Distillate Feed Reflux R XD thB, LT Heating medium Яh AT Bottoms B хв Figure E10.4

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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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