A set of nonredundant (1oo1) safety equipment is used to construct an element used in a SIF.
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A set of nonredundant (1oo1) safety equipment is used to construct an element used in a SIF. Demands are expected every minute. Diagnostic time is given as 1 second. The equipment is programmed to shut down the process on detection of dangerous failure. When adding the failure rates of the categories of all devices, the following failure rate data is obtained:
What is the demand mode? What SIL level is achieved by this design, based on the IEC 61508:2010, Route 1H architecture constraint table?
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Answer DI 1 minute and DTI 1 second DI 60X DTI which is 2X DTI The S...View the full answer
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Related Book For 
Safety Instrumented System Design Techniques And Design Verification
ISBN: 9781945541438
1st Edition
Authors: Iwan Van Beurden, William Goble
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