Red Hawk Polyester Mooring System Design And Verification

Haslum, Herbjørn; Tule, J.; Huntley, Mark; Jatar, S.

doi:10.4043/17247-ms

Cited by 8 publications

(6 citation statements)

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“…The ropes were about 9 inches in diameter and have a rated breaking strength of 2,750 kips. Detail of the design, analysis, and testing of the mooring rope were summarized in the literature (Haslum, et. al., 2005).…”

Section: Ultra-deepwater Mooring Systemsmentioning

confidence: 99%

Enabling Ultra-Deepwater Mooring with Aramid Fiber Rope Technology

Chi

Lundhild

Veselis³

et al. 2009

All Days

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New high-strength synthetic ropes constructed of para-bonded aromatic polyamide (aramid) fiber are being developed for ultra-deepwater mooring applications. This paper highlights new laboratory tensile/fatigue testing of rope assembly, computer modeling analysis of mooring performance under operating conditions, and the potential economic impact.As the industry moves into ultra-deep water, traditional steel wire rope and chain moorings are being gradually displaced by polyester ropes. These synthetic ropes have been used in water depths between 3,000 feet and 8,000 feet. Questions arise, however, about whether polyester mooring ropes provide enough stiffness to maintain acceptable platform offsets in increasingly deeper water in all cases. Aramid fiber ropes are inherently stiffer and stronger than polyester ropes and therefore offer new solutions for ultra-deepwater mooring, as well as for other applications where production platform offsets may be critical.Advanced technologies are being developed to optimize aramid fiber performance and rope design configurations. New laboratory tensile and fatigue data are presented to demonstrate aramid fiber rope properties, performance capabilities, and minimum tension settings meeting API RP 2SM guidelines. Mooring analysis comparing the performance of an aramid mooring system with that of a polyester mooring system under simulated hurricane and loop current conditions shows significant reductions in platform offsets are achieved with the aramid system without compromising safety. This paper describes a new technology for ultra-deepwater mooring. The new approach offers the opportunity to design mooring systems for deeper water without modifying certain platform components and systems by incorporating stiffer, high-strength aramid fibers in the platform mooring system. Potential benefits include achieving optimal offsets for production risers in ultra-deep water, easier handling and installation due to smaller rope size, and greater flexibility in mooring system design. Economic analyses are presented to illustrate the advantages of the new technology as well as the financial impact.

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Section: Ultra-deepwater Mooring Systemsmentioning

confidence: 99%

Enabling Ultra-Deepwater Mooring with Aramid Fiber Rope Technology

Chi

Lundhild

Veselis³

et al. 2009

All Days

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“…The modified polyester fiber ropes studied here were tested and installed on the Red Hawk cell spar [Haslum 2005]. The modified polyester fiber ropes studied here were tested and installed on the Red Hawk cell spar [Haslum 2005].…”

Section: Qualification Of Higher Stiffness Polyester Fiber Ropes For mentioning

confidence: 99%

“…Following successful installations offshore Brazil in the late 1990's [Pellegrin 1999] the first Gulf of Mexico mooring was for the Mad Dog spar [Bugg 2004] in 2004, which employed 1200 tons of polyester down to 1670 meters water depth. The Red Hawk spar [Haslum 2005], also installed in 2004, used a modified polyester fiber with a higher initial stiffness to facilitate installation, and this raised the question of whether a higher fiber stiffness might be beneficial for other supports and allow rope diameter to be reduced. Different rope constructions have been used but these mooring lines were all composed of similar high tenacity polyester fibers.…”

Section: Introductionmentioning

confidence: 99%

Deepwater Mooring With High Stiffness Polyester and PEN Fiber Ropes

et al. 2008

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The benefits of synthetic fiber ropes for deepwater station keeping are now well established and their use is expanding. Nearly all current applications use a single grade of polyester fiber, but for different supports and environments this may not be the optimal choice. Properties of polyester fibers can be modified by adjusting processing parameters and there are other fibers available such as PEN, which offer higher stiffness. This study examines the benefits of intermediate stiffness fibres, stiffer than standard polyester but less stiff than the high performance fibers. The results indicate that there is scope for improving mooring line performance and reducing line weight by careful evaluation of material options.

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“…[26] During installation, one polyester section was dropped to the sea floor. Each subrope is a large three-strand rope structure.…”

Section: Red Hawkmentioning

confidence: 99%

Polyester Mooring Lines on Platforms and MODUs in Deep Water

Flory¹,

Banfield²,

Berryman³

2007

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper is a review of the experiences and issues with the use of polyester fiber ropes as mooring lines in deepwater applications.Early studies showed that polyester rope taut-leg mooring systems could provide better offset-restoring properties in deep water than the traditional wire rope catenary mooring systems. But there was reluctance to use such moorings without further knowledge of fiber rope properties.Polyester and other fiber ropes were studied for deepwater moorings in several Joint Industry Projects (JIP) in the early 1990s. These studies provided vital information and answered many critical questions. They showed that polyester rope has desirable stretch characteristics and very good durability for use as mooring lines.The use of polyester mooring systems was pioneered by Petrobras in the late 1990s. Mobile Offshore Drilling Units (MODU) began using polyester mooring lines in the Gulf of Mexico (GOM) in the early 2000s. The first permanent applications of deepwater polyester mooring systems in the Gulf of Mexico were the Mad Dog and Red Hawk platforms, installed in early 2004.The use of polyester and other fiber rope mooring systems into even deeper water depths will present new challenges. Stiffer ropes may be necessary to achieve desirable mooring system characteristics. Longer, larger volumes of polyester rope will be difficult to handle. More knowledge of the properties of the alternative, high-modulus, high-strength fiber ropes may be needed.

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Red Hawk Polyester Mooring System Design And Verification

Cited by 8 publications

References 0 publications

Enabling Ultra-Deepwater Mooring with Aramid Fiber Rope Technology

Enabling Ultra-Deepwater Mooring with Aramid Fiber Rope Technology

Deepwater Mooring With High Stiffness Polyester and PEN Fiber Ropes

Polyester Mooring Lines on Platforms and MODUs in Deep Water

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