Improved Basis for Static Stability Analysis and Design of Marine Pipelines

Hale, J.R.; Lammert, W.F.; Jacobsen, V.

doi:10.4043/6059-ms

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…Besides, as an extreme design condition for the anchor block a flow current with 100 years return period is considered. No dataset of current velocity is available in this area, therefore the design flow velocity is derived by DNV (1993DNV ( , 2013, and Hale et al (1989), where both the current and wave load can be multiplied by a safety factor of 1.1 for a shallow area to 1.4 for middle strait. Furthermore, the same return period of 100 years should be considered for the design wave.…”

Section: Hydrodynamic Models and Concrete Block Analysismentioning

confidence: 99%

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Application of Offshore HDPE Pipes Route Design in North Maluku Indonesia

Novico¹,

Kurniawan²,

Egon

et al. 2021

Indo. J. Mar. Sci.

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The lack of fresh water for the inhabitants of Maitara island is a very urgent problem to be solved. Two main factors at least must be taken into account to deliberate the right of way of subsea High-density polyethylene (HDPE) pipes, namely the hydrodynamic conditions and of a block analysis. This paper presents the study to justify the best route of subsea HDPE pipes based on hydrodynamic model analysis and concrete block strategy. The method used to analyze the best route includes 2 aspects. Firstly, the investigation method consisting of a bathymetric survey conducted by a single beam echosounder, 15 days tidal observations and seabed sediment sampling. Secondly, the hydrodynamic modelling analysis using Mike 21 FMHD and concrete block analysis, all these studies have been completed in August 2018. In the morphological behaviour analysis, three alternative routes are considered for the subsea HDPE pipes from Tidore Island to Maitara Island. The outcome of the analysis shows that the second track line option has the smallest impact by the hydrodynamic conditions, with a current speed of less than 0,5m/sec and a significant wave height of fewer than 1.2 meters. Furthermore, the uniformity of the lithology along the route is the other reason to select the second route. Finally, the concrete block analysis generated a minimum dimension of 75cm x 60cm x 30cm, and a free span of 3 meters is safe to absorb the uplift and drag forces acting on the pipe.

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Section: Hydrodynamic Models and Concrete Block Analysismentioning

confidence: 99%

“…Based on hydrodynamic analysis results and selected type of HDPE PN20 pipe the safety of the proposed design can be analyzed. The stability against hydrodynamic loads, namely currents (Hale et al, 1989) and waves (Cheng et al, 2016) will be verified, including concrete block analysis.…”

Section: Hdpe Pipe Designmentioning

confidence: 99%

Application of Offshore HDPE Pipes Route Design in North Maluku Indonesia

Novico¹,

Kurniawan²,

Egon

et al. 2021

Indo. J. Mar. Sci.

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show abstract

“…Accurate prediction of on-bottom pipeline embedment has been a subject of study for a number of decades. Offshore pipelines are subjected to oscillatory forces and displacements during installation and to wave and/or current loads during operation (Wolfram et al, 1987;Allen et al, 1989;Hale et al, 1989 andAGA/PRC, 1993). Pipeline embedment essentially determines the magnitude of the pipe-soil contact area which, in turn, affects the soil resistance that may be mobilized during axial and lateral movements of the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Pipeline Embedment in Soft Submarine Soils by Different Methods

Birgören¹

2020

Uluslararası Muhendislik Arastirma Ve Gelistirme Dergisi

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The embedment of subsea pipelines in soft submarine clay is a key parameter in pipe-soil interaction studies of offshore deep water oil and gas field developments. A number of calculation methodologies exist, some of which are based on empirical evidence. Pipeline embedment depends on the active undrained shear strength and unit weight of the soil and the properties of the pipeline (i.e. weight and dimensions). The embedment is also influenced by stress concentrations occuring due to the geometry of the pipe catenary and by the cyclic motion of the catenary at the touchdown point. In this study, the methods typically used in the industry, such as those proposed by Terzaghi (1967), Dunlap et al. (1990) and Verley & Lund (1995) are compared with the methods recommended in DNVGL-RP-F114 (2017). The calculated embedment from each method are compared for typical pipe properties and soil strength and discussed in view of field observations reported in the literature. The older methods were found to typically underestimate embedment for low shear strength profiles.

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Initiation of breakout of half-buried submarine pipe from sea bed due to wave action

Law

Foda

1996

Applied Ocean Research

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Improved Basis for Static Stability Analysis and Design of Marine Pipelines

Cited by 6 publications

References 1 publication

Application of Offshore HDPE Pipes Route Design in North Maluku Indonesia

Application of Offshore HDPE Pipes Route Design in North Maluku Indonesia

Estimation of Pipeline Embedment in Soft Submarine Soils by Different Methods

Initiation of breakout of half-buried submarine pipe from sea bed due to wave action

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