Method of selective corrosion rate analysis for a fluid processing plant
First Claim
1. A method of selective corrosion rate analysis for generating an inspection schedule for a fluid processing plant, comprising the steps of:
- a. identifying a system from a division of the plant into one or more systems wherein each system has mechanical fluid containment components that are expected to experience a common corrosive environment and each system has at least one thickness measurement location for performing thickness inspections;
b. establishing system corrosion data for each thickness measurement location in the system;
c. running the system corrosion data through a plurality of corrosion engineering models; and
d. selecting a best fitting corrosion engineering model for generating a remaining life and optimum inspection schedule for each thickness measurement location in the system by running the system corrosion data through the selected best fitting corrosion engineering model.
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Abstract
A method of selective corrosion rate analysis is shown for generating an inspection and replacement schedule for a fluid processing plant. The method includes the steps of identifying a system from a division of the plant into one or more systems wherein each system has mechanical components that are expected to experience a common corrosion environment, and wherein each system has at least one thickness measurement location for performing thickness inspections. The next steps are establishing system corrosion data for each thickness measurement location and running the data through a plurality of corrosion engineering models. Running the corrosion engineering models includes coordinating the system corrosion data of the thickness measurement locations into a plurality of physical relationship data groups, and applying a plurality of statistical distribution/goodness-of-fit tests to each physical relationship data group. The final step is selecting a best fitting corrosion engineering model for generating an inspection schedule for the fluid containment components within each system of the plant. In a preferred embodiment of the method of selective corrosion rate analysis, the step of running the corrosion engineering models includes the additional step of identifying sub-populations within the application of the statistical distribution/goodness-of-fit tests so that identification of such sub-populations assists the user in identifying unknown corrosion mechanisms, and establishing specific inspection schedules for the sub-populations.
33 Citations
20 Claims
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1. A method of selective corrosion rate analysis for generating an inspection schedule for a fluid processing plant, comprising the steps of:
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a. identifying a system from a division of the plant into one or more systems wherein each system has mechanical fluid containment components that are expected to experience a common corrosive environment and each system has at least one thickness measurement location for performing thickness inspections; b. establishing system corrosion data for each thickness measurement location in the system; c. running the system corrosion data through a plurality of corrosion engineering models; and d. selecting a best fitting corrosion engineering model for generating a remaining life and optimum inspection schedule for each thickness measurement location in the system by running the system corrosion data through the selected best fitting corrosion engineering model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of selective corrosion rate analysis for generating an inspection schedule for a fluid processing plant, comprising the steps of:
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a. identifying a system from a division of the plant into one or more systems wherein each system has mechanical fluid containment components that are expected to experience a common corrosive environment and each system has at least one thickness measurement location for performing thickness inspections; b. establishing for each thickness measurement location system corrosion data drawn from an historical corrosion rate data base; c. running the system corrosion data through a plurality of corrosion engineering models, including coordinating the system corrosion data for each thickness measurement location into a plurality of physical relationship data groups the data groups being at least a first group having all of the thickness measurement locations grouped randomly and a second group having all system thickness measurement locations grouped according to different sized mechanical components in which the thickness measurement locations are located, applying a plurality of statistical distributions to each physical relationship data group, and applying a goodness-of-fit test to results of application of the statistical distributions to identify a combination of a physical relationship data group and statistical distribution as a best fitting corrosion engineering model that most accurately describes actual system corrosion behavior; d. selecting the best fitting corrosion engineering model for generating a remaining life and optimum inspection schedule for each thickness measurement location in the system by running the system corrosion data through the selected best fitting corrosion engineering model; and
repeating steps a,b,c,d for each system in the plant. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of selective corrosion rate analysis for generating an inspection schedule for a fluid processing plant, comprising the steps of:
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a. identifying a system from a division of the plant into one or more systems wherein each system has mechanical fluid containment components that are expected to experience a common corrosive environment and each system has at least one thickness measurement location for performing thickness inspections; b. establishing system corrosion data for each thickness measurement location in the system; c. running the system corrosion data through a plurality of corrosion engineering models including applying a plurality of statistical distributions to a plurality of physical relationship data groups, wherein the plurality of statistical distributions include at least a Normal, a Log Normal and a Weibull statistical distribution; and d. selecting a best fitting corrosion engineering model for generating a remaining life and optimum inspection schedule for each thickness measurement location in the system by running the system corrosion data through the selected best fitting corrosion engineering model. - View Dependent Claims (18, 19, 20)
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Specification