A simple technique for preventing upheaval buckling in flexible pipes
Conference
·
OSTI ID:100722
- Gerard Engineering Limited, Aberdeen (United Kingdom)
- Offshore Group, Houston, TX (United States)
Previous papers have presented a method of predicting the cover depth required to prevent the upheaval of flexibles given design subjected to given loadings. The maximum upheaval that can occur if the cover is inadequate or if the vertical misalignment of the pipe is greater than expected was quantified. This quantification is governed by the axial coefficient of friction between the pipe and the soil and assumes that there is no other imperfection of equivalent magnitude within the length of sliding pipe associated with the primary imperfection at which the upheaval is taking place, ie: assumes that the primary upheaval is not alleviated by any secondary upheaval elsewhere. The probability of a second imperfection close enough to alleviate the primary upheaval was addressed. It was concluded that in general this probability is not high enough to justify reliance on any alleviating effect. The present paper demonstrates how the problem can be solved by the introduction of artificial imperfections using polymer collars at regular intervals and presents equations for the correct design of the collar system.
- OSTI ID:
- 100722
- Report Number(s):
- CONF-950116--; ISBN 0-7918-1291-X
- Country of Publication:
- United States
- Language:
- English
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