Propagation buckling of pipe-in-pipe systems, an experimental study

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Alrsai, M
Karampour, H
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2016
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Gold Coast, Australia

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Abstract

The propagation buckling response of Pipe-in-pipe (PIP) system subjected to external pressure is investigated in this paper. Experimental study has been performed on buckling of aluminium PIPs with outer diameter to wall-thickness ratios (Di t) of26.7 and 30, inside a hyperbaric chamber. The experimental protocol is comprised of endsealing concentric PIP with a length of 1.6 m, inserting the PIP inside the 25MPa hyperbaric chamber and increasing the pressure until collapse of the system due to external pressure has occurred. This paper proposes a simple Ring Squash Test (RST) for estimating the propagation buckling pressure of PIPs which is compared against hyperbaric chamber results. The proposed ring squash test is a much expedient test to implement in comparison to hyperbaric chamber test and estimates the propagation pressure of PIPs with reasonable accuracy. Experimental results from the ring squash tests, confined ring squash tests (CRST) and hyperbaric chamber tests are presented, and are compared with empirical equations. The RST gives a lower bound of propagation pressure of PIPs. Previous empirical results agree well with current hyperbaric chamber results.

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Proceedings of the Twelfth ISOPE Pacific-Asia Offshore Mechanics Symposium (PACOMS 2016)

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© 2016 ISOPE . The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the conference's website for access to the definitive, published version.

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Maritime engineering

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Alrsai, M; Karampour, H, Propagation buckling of pipe-in-pipe systems, an experimental study, Proceedings of the Twelfth ISOPE Pacific-Asia Offshore Mechanics Symposium, PACOMS 2016, 2016, pp. 408-413