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King Flowlines - Thermal Expansion Design and Implementation

机译:King Flowlines-热膨胀设计和实施

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The King flowlines, located in the Mississippi Canyon area ofrnthe Gulf of Mexico, are dual Pipe-in-Pipe (PIP),rnapproximately 17 miles (27 km) long, installed in 5330 feetrn(1625 m) maximum water depth.rnThe novel PIP arrangement circulates heat medium in thernannular space between the 8" and 12" pipes to achieve activernheating over the entire length. Insulation around the outerrnpipe retains system heat.rnPIP active heating and insulation results in large thermalrnexpansion forces, causing local lateral deflections (buckles) inrnthe unburied flowlines. Without active buckle management,rnthe resultant peak bending strains and cyclic stresses at bucklernlocations were unacceptable. This paper describes thernsequence of events leading to the selection of vertical upsetrnsupports, called "sleepers", to initiate buckling at selectedrnlocations and control subsequent peak and cyclic bucklingrnstresses. Results from installation and system start-up arernpresented.rnThe use of sleepers to control thermal expansion is arnunique and original development, which has potentialrnapplications for any unburied pipeline where expansion forcesrnare high enough to ultimately fail the pipeline if uncontrolledrnbuckling occurs.
机译:国王流线位于墨西哥湾的密西西比峡谷地区,是双管道系统(PIP),长约17英里(27公里),安装在最大水深5330英尺(1625 m)处。这种布置使热介质在8“和12”管之间的环形空间中循环,从而在整个长度上实现主动加热。外管周围的隔热层可保留系统热量。rnPIP主动加热和隔热会导致较大的热膨胀力,从而在未埋入的流水线中引起局部侧向挠曲(卡扣)。如果没有主动的扣环管理,扣环位置处的峰值弯曲应变和循环应力是不可接受的。本文描述了导致选择垂直up陷支撑物(称为“睡眠者”)的事件序列,以在选定位置启动屈曲并控制随后的峰值和周期性屈曲应力。介绍了安装和系统启动的结果。使用轨枕来控制热膨胀是一种独特而原始的发展,对于任何未埋藏的管道都有潜在的应用,在这些管道中,膨胀力足够高,如果发生不可控制的屈曲,最终会使管道失效。

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