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Title: Analysis of severe circumferential SCC found on an ethane pipeline
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Catalog No.: 2340s
Date of Publication: 2015-03-01
Price: $25.00 US
Authors: Yannick Beauregard and Cody Edwards
Abstract: SEVERE CIRCUMFERENTIAL stress-corrosion cracking (SCC) was found on a section of pipe used in liquid ethane service. The damaged section of pipe was located near a road crossing and was cut-out before failure. This paper describes the analysis conducted on the pipe cutout and discusses the results in view of the existing SCC guidelines, specifically CEPA’s Stress corrosion cracking recommended practices [1]. The principle goals of this investigation were to characterize the crack dimensions and determine the failure pressure of the pipe cutout. A total of 146 cracks were identified with lengths ranging from a 1 mm to 50 mm. Crack depths were measured on a sub-set of the identified cracks using balanced-field electromagnetic technique (BFET), sequential grinding, and microstructural analysis. Crack depths of up to 2.6 mm (52% wall thickness) were identified. The failure pressure was determined by a burst test. The pipe began leaking at a pressure of 16.865 MPa, well in excess of the maximum operating pressure of 9.930 MPa. The results of the hydrostatic burst test are compared to failure-pressure calculations for an undamaged pipe and a pipe containing an axial crack with dimensions similar to the actual failed crack.
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