Stress Analysis of Reeled Composite Pipelines based on Shallow Shell Theories

The instabilities in reeled pipelines during spooling of (initially straight) or laying of
(initially bent) pipeare investigated based on shell theories. A combination of composite materials was studied and number of bending stability cases is discussed. It was demonstrated that composite pipeline exhibits more stability than steel pipes. The bending stability of spooled pipeline is examined in detailed and in particular, the case on the diameter drum of the reel lay system. Moreover, results on the strain energy release in the reel lay system are presented, extending the findings of previous works on controlling the spooling or laying mechanism.