Efficiency Limits for Slip-on Type Buckle Arrestors for Offshore Pipelines
Efficiency Limits for Slip-on Type Buckle Arrestors for Offshore Pipelines
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DOI：
10.1061/(asce)0733-9399(2002)128:1(102
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
S. Kyriakides
中科院分区：
文献类型：
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作者：
S. Kyriakides
用于海上管道的卡套式扣式避雷器与其他设计的避雷器相比具有重要优势，因为它们不需要焊接。两部分夹持式避雷器的相关概念提供的另一个优点是，它可以安装在连续的管道上。人们早就知道，这种装置往往不能达到更高的逮捕效率。因此，卡套式拦截器在深水应用中的使用受到了限制。性能有些不足的原因是，在低于管道坍塌压力的压力下，传播扣件可以通过折叠的U型穿透这种装置。即使对于非常坚硬的环，也可能发生这种情况。提出了一种计算滑套式拦截器所能达到的最大拦阻效率的方法。其效率的上界与传播屈曲开始穿透长而硬的圆周约束的压力有关。通过将交叉压力与屈曲将通过约束传播的最低压力相关联来确定下限。通过实验建立了这两种压力的参数依赖关系。所开发的方法给出了管路D/t的范围，在该范围内可以预期拦阻效率的下降，并预测了其程度。结果表明，阻拦效率的降低与管道的屈服应力有关。屈服应力较高的管道在拦阻效率方面的劣化较小。
Slip-on buckle arrestors for offshore pipelines offer important advantages over other arrestor designs as they do not require welding. An additional advantage offered by the related concept of the two-part clamp-on arrestor is that it can be installed onto a continuous pipe. It has long been known that such devices often cannot reach higher arresting efficiencies. As a result, the use of slip-on arrestors in deepwater applications has been limited. The somewhat deficient performance is due to the fact that a propagating buckle can penetrate such devices via a folded-up U mode at pressures that are lower than the collapse pressure of the pipe. This can take place even for very rigid rings. A methodology for generating bounds on the maximum arresting efficiency that can be expected from slip-on arrestors is developed. An upper bound of their efficiency is related to the pressure at which a propagating buckle starts to penetrate a long and stiff circumferential confinement. A lower bound is established by relating the crossover pressure to the lowest pressure at which the buckle will propagate through the confinement. The parametric dependence of both of these pressures was established experimentally. The method developed yields the range of pipe D/t's where degradation in arresting efficiency can be expected and predicts its extent. The arresting efficiency degradation was shown to depend on the yield stress of the pipe. Pipe of higher yield stress exhibits smaller degradation in arresting efficiency.