DESIGN OF SUBMARINE PIPELINES AGAINST UPHEAVAL BUCKLING

Abstract

To protect offshore pipelines from severe, environmental loads, anchor and fishing gears near shore areas, design engineers often trench the lines, or cover them with gravel to minimize the effect of the above condition on the submarine pipelines. This action will lead to restrict lateral movement of the pipeline which usually operates at high pressure, high . temperature and also is laid on irregular seabed.

Recently, at the

beginning ot; MAY-1990, it was first

published that, there IS

an offshore subsea buried

pipeline which

was laid at 40 meters

depth, and operating

at internal pressure

of 1000 psi and new mode of

temperature of failure called

80° c has UPHEAVAL

been attacked by a

BUCKLING. This

mode of fuilure led to an excessive deformation that caused a buckle wave about 2.6 meters height and about 24 meters length during seven months of service.