Parametric Study of Propagation Buckling Mitigation for Submarine Pipeline System by Using Integral Buckle Arrestor

Abstrak

One of the failure modes that appears in the submarine pipeline system is a pipe collapse or local buckling. This failure might be occurred as the result of high external hydrostatic pressure. Local buckling will propagate to another section of pipeline which causes propagation buckling along the pipeline system. Therefore, buckle arrestors are necessary to be installed along the critical location to prevent catastrophic failure. The aim of this study was to investigate the effect of geometry and material type variation of integral buckle arrestor to buckling load factor.

Parameter variations were covered from, (i) pipe diameter, (ii) pipe thickness, (iii) buckle arrestor length, (iv) the ratio of buckle arrestor thickness to pipe thickness, and (v) type of buckle arrestor material. The load case was taken from Masela Block, Abadi Gas Field preliminary route survey that will pass through a 5,309 ft of depth. The numerical simulations using ANSYSTM was conducted to demonstrate the effect of each parameter variation. Nominal Pipe Sizes of 26”, 28”, 30”, 32”, 34” with varied API 5L X42-X80 grade of material were used in the numerical simulation. The simulation was validated using previous experimental study and refers to standard DNVGL-OS-F101.

This study indicates that pipe thickness and pipe diameter are two significant factors to influenced buckling load factor. Ratio of buckle arrestor thickness to pipe thickness, length of buckle arrestor type of material pipe shows a modest change on the buckle load factor.