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Engineering and Tech / Process Dynamics and Control 3 / Chapter 10 / Problem 10.6

Process Dynamics and Control | 3rd Edition | ISBN: 9780470128671 | Authors: Dale E. Seborg

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QUESTION:

For the reliability analysis of the flow control loop in Example 10.3, the DIP flowmeter is the least reliable component. Suppose that a second, identical flowmeter is used in a backup mode so that it could be automatically and immediately employed if the first flowmeter failed. How much would the overall system reliability improve by adding the second sensor?

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QUESTION:

For the reliability analysis of the flow control loop in Example 10.3, the DIP flowmeter is the least reliable component. Suppose that a second, identical flowmeter is used in a backup mode so that it could be automatically and immediately employed if the first flowmeter failed. How much would the overall system reliability improve by adding the second sensor?

ANSWER:

Step 1 of 4

The given data in example 10.3 is,

Component	Reliability
D/P flowmeter	0.18
Digital controller	0.95
I/P transducer	0.61
Control valve	0.55
Valve positioner	0.64

The reliability of D/P flowmeter is 0.18.

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