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Extra resources for Pipeline Pigging & Integrity Technology

Sample text

3 + if > 50  Dt Dt where L = length of the corrosion The difference between the two equations is in the assumptions used to derive the relationships. A comparison of the key assumptions in the two equations appears in the following table: 22 • back pressure Table 5. 85 x length x max depth Figure 10 shows the difference in assumptions between the two equations. 90% Average depth (%NWT) 80% 70% Fail 60% 50% 40% B31G 30% Modified B31G 20% 10% 0% 0 5 10 15 Length (in) Figure 10. Plot illustrating the difference between B31G and modified B31G equations.

See cylindrical coordinate system. clay • 47 circumferential slotting: Refers to the approximate shape of long narrow metal loss anomalies, circumferentially aligned, as identified through in-line inspection. Specifically, the dimensions of the anomaly are width > A and length < A where A = wall thickness if t < 10, else A = 10 The definition is based on a document published by the Pipeline Operators Forum; additional detail is provided in the figure under defect classification. CIS: See close interval survey.

Common assessment criteria for corrosion (8) Assessment method Description B31G Method developed in the early 1970s based on the NG18 equation. See B31G. Modified B31G Improvements over the B31G equations include Folias Factor, flow stress, and effective area of metal-loss. See modified B31G. RStreng® Based on the modified B31G equation but uses a procedure to find the critical sub defect within a larger complex area of corrosion. See RStreng. Association of Oil Pipelines (AOPL): A non-profit organization started in 1947.

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