Pipeline End Manifold (PLEM) Structural Response Analysis due to the Settlement Process

Ichwandanny Faturahman Darobi, Murdjito Murdjito, Hasan Ikhwani

Abstract


Pipeline End Manifold (PLEM) is an offshore structure that consists of a simple subsea manifold that combines two or more pipelines into one pipeline. Like other offshore structures, the risk of seabed settlement may occur, and settlement is predicted can increase the stress of pipe and frame members. Stress that exceeds the allowable stress of codes may be a danger. So, stress analysis of the UC ratio of pipe and frame PLEM due to the settlement must be done. Stress analysis is performed using the numerical method with the model in FEM software. UC ratio refers to AMSE B31.8 2010 for pipe and API RP 2A (WSD) 22ed 2014 for the structural frame. From this analysis, the allowable settlement of pipe codes is at a depth below 450.42 mm. The deeper the settlement, the more stress the member frame increases. At a depth of 600 mm settlement, the greatest stress, 133.125 N/mm^2, UC 0.375, is found on member E04(L). According to the pipe codes, the maximum slope is 2.27˚ on the southward slope. The biggest effect of tilt settlement on the member frame is found in the west direction at member E04(U) with a value of 244.6 N/mm^2, UC 0.689, tilt settlement 3˚.

Keywords


Settlement, Tilt Settlement, PLEM, Pipe Stress Analysis, Structural Frame Stress Analysis

Full Text:

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References


Koto, J. 2018. Subsea PLEM & PLET Theory and Application. 3rd ed. Ocean & Aerospace Research Institute, Indonesia.

Ahmad, Z.B. 2011. "Installation of Pipeline End Manifold (PLEM) and Subsea Tie-In of Expansion Spools." PETRONAS-PETRAD-INTSOK-CCOP Deepwater Subsea Tie-Back Workshop. 25-26 January.

Bai, Yong. & Bai, Qiang. 2010. Subsea Engineering Handbook. Elsevier, Houston.

The American Society of Mechanical Engineers. 2010. Gas Transmission and Distribution Piping Systems B31.8. ASME, New York.

American Petroleum Institute. 2014. Recommended Practice for Planning, Designing, and Constructing Fixed Offshore Platform, Working Stress Design. 22nd ed. API, Washington DC.

Harialdi, M. 2005. Prinsip-Prinsip Statistik Untuk Teknik dan Sains.Erlangga, Jakarta.




DOI: http://dx.doi.org/10.12962%2Fj25800914.v8i2.22076

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