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Research Papers: Offshore Technology

Assessment of a Jack-Up Offshore Launching Through Model Tests and Field Measurements

[+] Author and Article Information
Claudio A. Rodríguez

LabOceano,
Department of Naval Architecture
and Ocean Engineering,
COPPE – Federal University of Rio de Janeiro,
Caixa Postal No. 68.508,
Rio de Janeiro, RJ CEP 21.945-970, Brazil
e-mail: claudiorc@laboceano.coppe.ufrj.br

Paulo T. T. Esperança

LabOceano,
Department of Naval Architecture
and Ocean Engineering,
COPPE – Federal University of Rio de Janeiro,
Caixa Postal No. 68.508,
Rio de Janeiro, RJ CEP 21.945-970, Brazil
e-mail: ptarso@laboceano.coppe.ufrj.br

Mário Moura

Odebrecht,
Av. das Nações Unidas,
8501-32° andar, Pinheiros,
São Paulo, SP CEP 05425-070, Brazil
e-mail: mario.moura@enseada.com

Jacques Raigorodsky

Odebrecht,
Av. das Nações Unidas,
8501-32° andar, Pinheiros,
São Paulo, SP CEP 05425-070, Brazil
e-mail: jacquesraigo@odebrecht.com

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received July 31, 2014; final manuscript received October 10, 2014; published online November 17, 2014. Assoc. Editor: John Halkyard.

J. Offshore Mech. Arct. Eng 137(1), 011301 (Feb 01, 2015) (8 pages) Paper No: OMAE-14-1106; doi: 10.1115/1.4028821 History: Received July 31, 2014; Revised October 10, 2014; Online November 17, 2014

Recently, an experimental campaign was carried out to assess the feasibility of the launching operation of two jack-up units using a barge as the launching platform. This experimental study was divided in four stages. In stages 1 to 3, a series of preliminary model tests were performed in order to provide scientific understanding of the mechanics of the operation and investigate systematically the influence of launching parameters. The experimental approach developed for testing this operation and the results of the preliminary launching tests have already been discussed in detail. Based on the analyses of the experimental results of stages 1 to 3 and the results of numerical simulation tools in stage 4, a final launching condition was designed and a new set of model tests was specified to check the safety of the operation. This paper presents the results and analyses of the experimental tests of stage 4. The conditions tested in this stage covered the expected real launching condition and possible deviations in some launch parameters. The tests results include the 6 degree-of-freedom (DOF) motions and trajectories of the launched jack-up and the launch barge, and the reaction forces on the barge rocker arms. Later on, the success of the launching operations of P-59 and P-60 jack-up units confirmed the experimental investigation results and the feasibility of this novel launching procedure. During the launching of unit P-60, field measurements were performed that confirmed that model tests as an efficient tool for the assessment of high risk operations.

Copyright © 2015 by ASME
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References

Rodríguez, C. H., Esperança, P. T., Moura, M., and Raigorodsky, J., 2014, “An Experimental Approach for the Offshore Launching of Jack-ups,” ASME J. Offshore Arct. Eng., 136(2), pp. 1–10. [CrossRef]
Chakrabarti, S. K., 1994, Offshore Structure Modeling (Advanced Series on Ocean Engineering, Vol. 9), World Scientific Publishing, Singapore.
“Ships & Structures: Offshore Structures: Jacket,” Maritime Research Institute Netherlands (MARIN), Last Accessed Mar. 16, 2014, http://www.marin.nl/web/Ships-Structures/Offshore-structures/Jacket.htm
“Jacket Launch,” Ultramarine—Marine Engineering Specialists, Last Accessed Mar. 16, 2014, http://www.ultramarine.com/hdesk/runs/samples/install/launch.htm
GL Noble Denton, 2013, “Guidelines for the Transportation and Installation of Steel Jackets,” 0028/ND, Rev. 5, Technical Policy Board.

Figures

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Fig. 2

Model test setup for condition 1

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Fig. 3

Computed equivalent FRC during jack-up slip

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Fig. 4

Jack-up surge motion during slip

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Fig. 5

Effect of FRC on jack-up heave

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Fig. 6

Effect of FRC on jack-up pitch

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Fig. 7

Pitch for barge and jack-up—base condition

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Fig. 8

Effect of FRC on rocker arm reaction

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Fig. 9

Effect of LCG deviation on jack-up pitch

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Fig. 10

Effect of LCG deviation on rocker arm reactions

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Fig. 11

Effect of TCG deviation on port rocker arm

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Fig. 12

Effect of TCG deviation on starboard rocker arm

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Fig. 13

Effect of TCG deviation on jack-up pitch

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Fig. 14

Effect of TCG deviation on jack-up roll

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Fig. 15

Effect of weight deviation on port rocker arm

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Fig. 16

Effect of weight deviation on starboard rocker arm

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Fig. 17

Effect of weight deviation on heave

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Fig. 18

Effect of weight deviation on pitch

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Fig. 19

P-59 ready for launch

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Fig. 20

P-60 ready for launch

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Fig. 21

P-60 pitch angular rate during launch

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Fig. 22

P-60 pitch angle during launch

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Fig. 23

P-60 longitudinal acceleration during launch

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Fig. 24

Equivalent FRC during launch

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Fig. 25

P-59 at maximum pitch just after launch (bow washed)

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Fig. 26

P-60 at maximum pitch just after launch (dry bow)

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