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Research Papers: Offshore Technology

Selection of Design Lower Deck Elevation of Fixed Offshore Platforms for Mexican Code

[+] Author and Article Information
Dante Campos

Mexican Petroleum Institute,
Eje Central Lázaro Cárdenas Norte 152,
Col. San Bartolo Atepehuacan,
Del. Gustavo A. Madero, 07730 DF, Mexico
e-mail: dcampos@imp.mx

César Ortega

Mexican Petroleum Institute,
Eje Central Lázaro Cárdenas Norte 152,
Col. San Bartolo Atepehuacan,
Del. Gustavo A. Madero, 07730 DF, Mexico
e-mail: ceortegae@hotmail.com

Jorge L. Alamilla

Mexican Petroleum Institute,
Eje Central Lázaro Cárdenas Norte 152,
Col. San Bartolo Atepehuacan,
Del. Gustavo A. Madero, 07730 DF, Mexico
e-mail: jalamill@imp.mx

Alberto Soriano

Mexican Petroleum Institute,
Eje Central Lázaro Cárdenas Norte 152,
Col. San Bartolo Atepehuacan,
Del. Gustavo A. Madero, 07730 DF, Mexico
e-mail: asoriano@imp.mx

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 February 24, 2015; final manuscript received July 27, 2015; published online August 21, 2015. Assoc. Editor: Colin Leung.

J. Offshore Mech. Arct. Eng 137(5), 051301 (Aug 21, 2015) (8 pages) Paper No: OMAE-15-1015; doi: 10.1115/1.4031219 History: Received February 24, 2015; Revised July 27, 2015

This paper presents the definition of lower deck elevation (LDE) of fixed offshore platforms in Mexican part of the Gulf of Mexico (GoM), which were applied in the Mexican code for design and assessment of fixed offshore structures NRF-003-PEMEX-2007. This was obtained as a result of a decision methodology developed here, an optimization algorithm composed of an objective minimization function subject to a safety restriction and by the application of a set of real structural maintenance and equipment replacement costs. Platform projected service life dependent total costs of LDE contemplate expected costs of structural and equipment maintenance after the occurrence of tropical cyclones and northers, and the expected cost of equipment mobilization. This work regards a group of offshore platforms in the Bay of Campeche whose elevation lies between 15.85 and 19.10 m above mean sea level, as well as recent metocean hazard information. Similar expected values of total costs due to maintenance and repair were obtained, while safety constrains demand the LDE not to be less than +19.10 m.

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References

Figures

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Fig. 1

Schematic representation of typical deck configuration

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Fig. 2

Annual safety index rate

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Fig. 3

TME histogram for all offshore platforms and drill platforms in the Bay of Campeche

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Fig. 4

Relative frequencies of crane vessels in year 2005 for six analyzed drilling platforms

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Fig. 5

Expected value of total cost as function of LDE for the 18 cases

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