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Extra resources for API Std 1163 In-line Inspection Systems Qualification Standard, First Edition
For example, a 95% confidence interval computed for certainty implies that the true certainty of the ILI system lies somewhere between the upper and lower limit of the interval. ” For the purpose of this example, “large” is considered greater than 20. IN-LINE INSPECTION SYSTEMS QUALIFICATION STANDARD Table 9 shows an example of confidence intervals based on a confidence level of 95% and 25 comparisons. Here, a confidence level of 95% implies there is a 95% probability the true ILI system certainty is between the lower and upper limits.
1 A quality process should be employed in order to ensure the accuracy of pressure and strain calculations. 4 The ILI system results may be provided in a database format that is easily imported into a pipeline integrity assessment application. 5 If dig data has been incorporated into the results, the report shall clearly show how the field measurements from the dig(s) have been incorporated into the report. 1 SYSTEM SCOPE This section establishes the quality system standards that are required of organizations that perform the services used for inline inspection systems and in-line inspections, utilizing those systems.
Calculate the total tolerance. 66. This means that if the absolute value of the field measurement minus the reported measurement is less than or equal to 12% (t), the reported depth prediction would be within tolerance. With n = 25, there are 19 comparisons within tolerance • Using Table 7: Determine if the assumption that the certainty is at least 80% should be rejected using a 95% Confidence Limit. The probability given in the binomial table is 38%. Since this value is well above the 5% rejection level (100% – 95%), then one would fail to reject the assumption that the certainty is at least 80%.