Risk assessment for relief pressure system
First Claim
1. A method of assessing risks to pressure equipment associated with at least one pressure relief system having a relief header, comprising:
- a. identifying one or more relief header inputs associated with the equipment;
b. identifying one or more common mode failure scenarios for the relief header inputs;
c. calculating a first hydraulic model for the one or more common mode failure scenarios;
d. defining a risk acceptance criteria for an accumulation in one or more members of the equipment associated with the relief header inputs;
e. defining initiating events frequency of occurrence for one or more common mode failure scenarios;
f. determining at least one of the risk acceptance criteria is not met by the first hydraulic model;
g. defining a probability of failure for one or more protection systems associated with the equipment; and
h. calculating an output by correlating an accumulation of the one or more members of the equipment with the frequency of occurrence.
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Accused Products
Abstract
Quantitative Risk Analysis (QRA) can be applied to provide a more realistic assessment of the risk associated with vessel accumulation due to common mode scenarios. The QRA process takes the results of a traditional flare study and QRA inputs such as the frequencies of the common mode scenarios and the layers of protection that will tend to reduce the severity of the common mode scenario, and generates an system risk profile, such as an accumulation versus frequency relationship for each vessel discharging to the relief header. This relationship provides an estimate of the overall risk associated with the relief header system. The QRA program makes the above analysis process possible by automating the generation, execution, and interpretation of the many possible permutations that are required to characterize the system.
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Citations
25 Claims
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1. A method of assessing risks to pressure equipment associated with at least one pressure relief system having a relief header, comprising:
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a. identifying one or more relief header inputs associated with the equipment;
b. identifying one or more common mode failure scenarios for the relief header inputs;
c. calculating a first hydraulic model for the one or more common mode failure scenarios;
d. defining a risk acceptance criteria for an accumulation in one or more members of the equipment associated with the relief header inputs;
e. defining initiating events frequency of occurrence for one or more common mode failure scenarios;
f. determining at least one of the risk acceptance criteria is not met by the first hydraulic model;
g. defining a probability of failure for one or more protection systems associated with the equipment; and
h. calculating an output by correlating an accumulation of the one or more members of the equipment with the frequency of occurrence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of assessing risks to pressure equipment associated with at least one pressure relief system having a relief header, comprising:
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a. identifying one or more relief header inputs associated with the equipment;
b. identifying at least one common mode failure scenario for the relief header inputs;
c. calculating a first hydraulic model for the at least one common mode failure scenario;
d. defining a risk acceptance criteria for an accumulation in the equipment associated with the relief header inputs;
e. defining initiating events frequency of occurrence for the at least one common mode scenario;
f. determining whether the risk acceptance criteria are met by the first hydraulic model. - View Dependent Claims (19)
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20. A system for assessing risks to pressure equipment associated with at least one pressure relief system having a relief header, comprising:
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a. an electronic processor;
b. a memory coupled to the electronic processor, the memory containing one or more programs to be processed by the electronic processor, the one or more programs being adapted to;
i. use input data for;
a. identified relief header inputs;
b. identified common mode failure scenarios for the relief header inputs;
c. defined risk acceptance criteria for an accumulation in the equipment associated with the relief header inputs; and
d. defined initiating events frequency of occurrences for the common mode scenarios;
e. defined probability of failure for one or more protection systems coupled to one or more of the relief header inputs;
ii. calculate a first hydraulic model for at least one of the common mode failure scenarios;
iii. automatically calculate probability of failures for combinations of protection systems associated with the relief header inputs; and
iv. automatically correlate an accumulation of one or more members of the equipment with the frequency of occurrences; and
c. an output element coupled to the memory for producing an output of the correlation of the accumulation of one or more members of the equipment with the frequency of occurrences. - View Dependent Claims (21, 22)
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23. A method of assessing risks to pressure equipment associated with at least one pressure relief system having a relief header, comprising:
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a. identifying a plurality of relief header input associated with the pressure equipment;
b. identifying a common mode failure scenario for the plurality of relief header inputs;
c. calculating a first hydraulic model for the common mode failure scenario;
d. defining a risk acceptance criteria for an accumulation in the pressure equipment associated with the plurality of relief header inputs; and
e. determining whether the risk acceptance criteria are met by the first hydraulic model. - View Dependent Claims (24)
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25. A system for assessing risks to pressure equipment associated with a relief system having a relief header, comprising:
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a. an electronic processor;
b. a memory coupled to the electronic processor, the memory containing one or more programs to be processed by the electronic processor, the one or more programs being adapted to;
i. use input data for;
a. identified relief header inputs;
b. identified common mode failure scenarios for the relief header inputs;
c. defined risk acceptance criteria for an accumulation in the equipment associated with the relief header inputs; and
d. defined initiating events frequency of occurrences for the common mode scenarios;
ii. calculate a first hydraulic model for at least one of the common mode failure scenarios; and
iii. automatically correlate an accumulation of one or more members of the equipment with the frequency of occurrences; and
c. an output element coupled to the memory for producing an output of the correlation of the accumulation of one or more members of the equipment with the frequency of occurrences.
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Specification