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Title: Control of ductile facture propagation in X80 gas linepipe
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Catalog No.: 2235s
Date of Publication: Sep 1 2011 12:00AM
Price: $25.00 US
Authors: Gianluca Mannucci and Giuseppe Demofonti
Abstract: THE NEED TO CONVEY large quantity of gas from reservoirs located in remote areas to the consuming markets is pushing the development of a significant number of new long-distance high-pressure gas-transmission pipelines. In order to be cost effective, these lines should be operated at high pressure (>10MPa) and constructed using large-diameter, high-grade steel linepipe such as API 5L X80 or greater. In addition, it is expected that these lines will convey rich gases – that is, gases rich in heavier components – as well as having to cross remote areas characterized by significant environmental constraints such as very low operating temperature.

Ductile-fracture propagation control for these new lines is of primary importance, since a failure could cause a long and costly gas delivery service breakdown. The envisaged operating conditions (high grade, large diameter, high pressure, rich gas, low temperature) are such that the determination of minimum toughness requirements for arresting a propagating fracture is not a trivial issue.

The paper presents the state-of-the-art about ductile-fracture control for X80 linepipe, looking at the available predictive methods, standards’ provisions, and the published full-scale burst-test database; it also mentions specific aspects such as the influence of separation on the fracture surface and the difference between the behaviours of spiral- and longitudinal-welded pipes. Finally the alternative to the linepipe material’s self-arrestability by the use of an external mechanical device – the so-called crack arrestor – is discussed.

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