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PRCI PR-201-020
- Effects--Buckle Arrestors on Failure During Pipelay
- Report / Survey by Pipeline Research Council International, 03/01/1991
- Publisher: PRCI
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L51644e
Stress Engineering Services, Inc.
Need: Submarine pipelines are usually laid from the ocean surface onto the ocean floor using specially designed ships and barges. Lengths of pipes are welded together on board the barge to form the pipeline and then the pipeline is passed over a ramp called a stinger on its way to the ocean floor. A constant tension force is applied to the pipeline on the barge to prevent it from buckling as it approaches the ocean floor. For thin wall pipes, the high stresses could result in local buckling of the pipeline.
Benefit: This report describes ananalytical and experimental research study to determine the effect of buckle arrestors on stresses and buckling behavior of submarine pipelines during their installation.
Result: A small scale experimental study was conducted to gather data and to better understand the behavior. One test was performed on each buckle arrestor. A test sample with a Type II buckle arrest or failed due to local buckling of the pipe near the buckle arrestor. The other two test samples failed due to excessive local-yielding of the pipes near the buckle arrestors. The test results were used to develop design recommendations for pipelaying setup. The data suggests that a limit on the maximum strain in the pipe of 0.5 percent may be appropriate.
Stress Engineering Services, Inc.
Need: Submarine pipelines are usually laid from the ocean surface onto the ocean floor using specially designed ships and barges. Lengths of pipes are welded together on board the barge to form the pipeline and then the pipeline is passed over a ramp called a stinger on its way to the ocean floor. A constant tension force is applied to the pipeline on the barge to prevent it from buckling as it approaches the ocean floor. For thin wall pipes, the high stresses could result in local buckling of the pipeline.
Benefit: This report describes ananalytical and experimental research study to determine the effect of buckle arrestors on stresses and buckling behavior of submarine pipelines during their installation.
Result: A small scale experimental study was conducted to gather data and to better understand the behavior. One test was performed on each buckle arrestor. A test sample with a Type II buckle arrest or failed due to local buckling of the pipe near the buckle arrestor. The other two test samples failed due to excessive local-yielding of the pipes near the buckle arrestors. The test results were used to develop design recommendations for pipelaying setup. The data suggests that a limit on the maximum strain in the pipe of 0.5 percent may be appropriate.
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