System and method for continuous online safety and reliability monitoring
First Claim
1. A method for managing a safety instrumented function including a plurality of instrumented function components, the method comprising:
- obtaining a test completion time for at least one of the plurality of instrumented function components;
determining a probability of failure on demand for the safety instrumented function based on the test completion time;
comparing the probability of failure on demand with a designed probability of failure on demand for the safety instrumented function to establish a variance; and
managing the plurality of instrumented function components based on the variance.
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Accused Products
Abstract
A system and method for continuous online safety and reliability monitoring is disclosed. The method includes the steps of obtaining operating information about at least one of a plurality of instrumented function components, which are part of an instrumented function, and determining a probability of failure on demand for the instrumented function based on the operating information. In variations, instantaneous probability of failure on demand, online mean time to failure (MTTF), and online safety integrity level (SIL) are also calculated for an instrumented function. In other variations of the invention, alarms are reported to an operator based on the variance indicating the probability of failure on demand for the instrumented function is too high. In yet further variations, the system allows a user to predict probability of failure on demand values into the future based on hypothetical and/or future planned test times.
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Citations
17 Claims
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1. A method for managing a safety instrumented function including a plurality of instrumented function components, the method comprising:
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obtaining a test completion time for at least one of the plurality of instrumented function components; determining a probability of failure on demand for the safety instrumented function based on the test completion time; comparing the probability of failure on demand with a designed probability of failure on demand for the safety instrumented function to establish a variance; and managing the plurality of instrumented function components based on the variance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for managing a safety instrumented function including a plurality of instrumented function components, the system comprising:
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means for obtaining a test completion time for at least one of the plurality of instrumented function components; means for determining a probability of failure on demand for the safety instrumented function based on the test completion time; means for comparing the probability of failure on demand with a designed probability of failure on demand for the safety instrumented function to establish a variance; and means for providing, based on the variance, information useable for managing the plurality of instrumented function components. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification