Stochastic approach to the quantification of buried flexible flowline upheaval
Conference
·
OSTI ID:89817
- Gerard Engineering Ltd., Aberdeen (United Kingdom)
Previous papers have presented a simple method of predicting the cover depth required to prevent the upheaval of flexibles of given design subjected to given loadings. The present paper gives a brief resume of the method and then goes on to quantify the maximum upheaval that can occur if the cover is inadequate or if the vertical misalignment of the pipe is greater than expected. This quantification is governed by the axial coefficient of friction between the pipe and the sail 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 paper then addresses the probability of a second imperfection close enough to alleviate the primary upheaval. It is concluded that in general this probability is not high enough to justify reliance on any alleviating effect; it may only be relied upon if the as-trenched vertical alignment of the pipe is consistently bad. Design guidelines are indicated.
- OSTI ID:
- 89817
- Report Number(s):
- CONF-940113--; ISBN 0-7918-1184-0
- Country of Publication:
- United States
- Language:
- English
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