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PRCI PR-218-9434
- Serviceability of Corroded Girth Welds
- Report / Survey by Pipeline Research Council International, 05/31/1996
- Publisher: PRCI
$325.00$649.00
L51742e
Kiefner & Associates, Inc.
(e-book version) Need: Prior research conducted for PRCI and others led to the development of criteria for estimating the burst strength of corroded pipe, and corollary criteria for establishing allowable defect sizes. These criteria have become widely used in the pipeline industry. That research revealed that the severity of metal-loss corrosion in the context of pressure integrity is directly affected by the length of the corroded area (as measured parallel to the pipe longitudinal axis) and the depth of the corrosion. Moreover, the length and depth affect burst strength independently, meaning a long shallow defect may be more severe than a shorter but deeper defect representing the same area of metal loss in the cross section. Another significant finding was that if fracture initiation is ductile, the failure stress is insensitive to actual (dynamic) toughness as measured by Charpy impact energy, although the toughness level does influence propagation of the fracture.
Benefit: This research had as its objective the development of guidelines for assessing the serviceability of circumferentially oriented corrosion defects found within the girth weld zone. The results of this program were: (1) a database (314 experiments) on the failure stress of circumferential defects in pipe; (2) analysis of 24 methodologies for calculating the failure stress of circumferential defects, and (3) a recommended procedure for addressing circumferentially oriented metal loss corrosion in the girth weld zone. The recommended procedure relates the linear parameters of the corroded area, material strength properties, the possible presence of other flaws in the girth weld and the operating stresses to a pass/fail criterion.
Result: The results of this program are:
1. a supporting data base of results from 314 experiments testing the failure stress of circumferential defects in pipe;
2. a review and comparison of 24 solutions for calculating the failure stress;
3. a recommended procedure for assessing the severity of circumferentially-oriented metal-loss corrosion affecting girth welds and base metal.
Kiefner & Associates, Inc.
(e-book version) Need: Prior research conducted for PRCI and others led to the development of criteria for estimating the burst strength of corroded pipe, and corollary criteria for establishing allowable defect sizes. These criteria have become widely used in the pipeline industry. That research revealed that the severity of metal-loss corrosion in the context of pressure integrity is directly affected by the length of the corroded area (as measured parallel to the pipe longitudinal axis) and the depth of the corrosion. Moreover, the length and depth affect burst strength independently, meaning a long shallow defect may be more severe than a shorter but deeper defect representing the same area of metal loss in the cross section. Another significant finding was that if fracture initiation is ductile, the failure stress is insensitive to actual (dynamic) toughness as measured by Charpy impact energy, although the toughness level does influence propagation of the fracture.
Benefit: This research had as its objective the development of guidelines for assessing the serviceability of circumferentially oriented corrosion defects found within the girth weld zone. The results of this program were: (1) a database (314 experiments) on the failure stress of circumferential defects in pipe; (2) analysis of 24 methodologies for calculating the failure stress of circumferential defects, and (3) a recommended procedure for addressing circumferentially oriented metal loss corrosion in the girth weld zone. The recommended procedure relates the linear parameters of the corroded area, material strength properties, the possible presence of other flaws in the girth weld and the operating stresses to a pass/fail criterion.
Result: The results of this program are:
1. a supporting data base of results from 314 experiments testing the failure stress of circumferential defects in pipe;
2. a review and comparison of 24 solutions for calculating the failure stress;
3. a recommended procedure for assessing the severity of circumferentially-oriented metal-loss corrosion affecting girth welds and base metal.
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