Appraisal of Lightweight Moorings for Deep Water

Chaplin, C. R.; Vecchio, C.J.M. Del

doi:10.4043/6965-ms

Cited by 13 publications

(13 citation statements)

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“…As highlighted by Chaplin and Del Vecchio (1992), system design is strongly influenced by the non-linear visco-elastic behavior of polyester ropes. Therefore obtaining tether properties at all relevant loading regimes, to use in design, is essential.…”

Section: Design Procedures and Parametersmentioning

confidence: 99%

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Moorings with Polyester Ropes in Petrobras: Experience and the Evolution of Life Cycle Management

Rossi¹,

Vecchio²,

Gonçalves³

2010

Proceedings of Offshore Technology Conference

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This paper describes the experience of Petrobras in the design, installation and operation of deepwater mooring systems incorporating high efficiency polyester fiber ropes. These ropes have been used now for more than 12 years in catenary and taut configurations to moor drilling and production units as well as storage and offloading facilities. The paper provides a history of the development of this technology, highlighting the key issues involved in introducing in mooring systems a component that has non-linear visco-elastic behavior. Differences to all steel systems in terms of: behavior, failure modes and design criteria and procedures are discussed. The paper presents the life cycle management strategy adopted by Petrobras in the early years of the use of this technology and its evolution that have guaranteed that the only failure mode observed over all these years was mechanical damage. It is expected that this paper shows that the use of polyester (polyethylene terephthalate) ropes in deepwater moorings is a mature technology.

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Section: Design Procedures and Parametersmentioning

confidence: 99%

“…Results of a comprehensive study on the use of fiber ropes for deepwater moorings were presented in 1992 (Chaplin & Del Vecchio, 1992). Full details of the study, including assessment of failure modes, load-elongation behavior, design methodologies and criteria were produced .…”

Section: Introductionmentioning

confidence: 99%

Moorings with Polyester Ropes in Petrobras: Experience and the Evolution of Life Cycle Management

Rossi¹,

Vecchio²,

Gonçalves³

2010

Proceedings of Offshore Technology Conference

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“…Recently polyester was used in field trials down to 1900 meters depth 5 but there are few guidelines concerning alternative materials. Chaplin & Del Vecchio compared polyester ropes to steel at depths of 500, 1000 and 2000 meters 6 . Cloos & Bosman compared nylon, polyester, and aramid ropes at depths to 3000 meters and concluded that there is a minimum depth for each material, that for aramid being 1000 meters 7 .…”

Section: Introductionmentioning

confidence: 99%

Synthetic Mooring Lines for Depths to 3000 Meters

et al. 2002

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This paper presents a study of the use of synthetic fibre mooring lines for deep-sea applications. Three materials are considered: polyester, aramid and HMPE. First, results from a test program completed recently are described. These tests on full size ropes, which include novel extensometric methods based on image analysis, have enabled the influence of mean load, load range and loading frequency on stiffness to be determined for the three materials. Ropes up to 750 tons MBL (minimum break load) have been tested. A comprehensive data set of this type has not been available previously. These data are then used in mooring system analyses, to evaluate a number of design cases for the station keeping of exploration and production platforms. This has allowed a better understanding of the domains of application of these different materials and of related issues for design. Materials research needs have also been clarified. The minimum tension criterion for HMPE and aramid fibre ropes is shown to be one of the critical technical parameters that should be further investigated in order to extend the further application of these materials for taut mooring systems design. Attention should also be given to fatigue analysis for the aramid and HMPE lines.

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“…1,2 As with many other proposed new drilling technologies, actual field experience specific to MODUs is limited. The use of synthetic fiber lines can greatly reduce the vertical loads on the rig, enable the use of existing winches in greater water depths, and/or increase the amount of available variable deck load.…”

Section: Introductionmentioning

confidence: 99%

HMPE Mooring Line Trial for Scarabeo III

Corbetta

Sloan

2001

All Days

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This paper describes the deployment of a high-modulus polyethylene (HMPE) mooring insert line on the Scarabeo III MODU. Several new technologies are now available that can increase the maximum rated water depth of 2 nd and 3 rd generation drilling rigs. The purpose of this trial was to qualify one such technology, the use of lightweight synthetic fiber rope mooring lines. The desire to deploy and recover the lines on existing boats and equipment led to the selection of HMPE as the trial rope material. HMPE ropes are almost neutrally buoyant, have high abrasion resistance and exhibit a strength-to-diameter ratio similar to that of steel wire rope. The HMPE line used in the present study, a field-repairable Plasma ® 12x12-strand braided rope, served without incident for 3 years. After damage was discovered at one of the rope terminations, the rope was returned to the manufacturer for retermination and residual strength determination. The rope was also inspected and any damaged strands repaired prior to being returned to service. The study demonstrated the durability and ease of handling of these lines, in particular the 12x12-strand braid, for MODU mooring applications. The scope of the paper includes static mooring analysis, deployment procedures, mooring load data and residual strength data. Recommendations are made regarding deployment methods for synthetic ropes.

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Appraisal of Lightweight Moorings for Deep Water

Cited by 13 publications

References 0 publications

Moorings with Polyester Ropes in Petrobras: Experience and the Evolution of Life Cycle Management

Moorings with Polyester Ropes in Petrobras: Experience and the Evolution of Life Cycle Management

Synthetic Mooring Lines for Depths to 3000 Meters

HMPE Mooring Line Trial for Scarabeo III

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