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- W2085281808 abstract "Abstract There are several different anchor types that rely on the point of application of the chain being below the seabed. These can include anchor piles, suction caisssons, and driven or suction installed plate anchors. Subsequent to installation in the vertical direction, the mooring chain may be pretensioned to a nominal level in the horizontal direction, cutting through the soil to some extent. During the life of the floating installation, mooring loads will be experienced that are generally greater than the pretension level, and this brings about additional movement, or slippage, of the chain through the soil. There are currently few guidelines in the public domain regarding the selection of a pretension level that is appropriate for any given installation. This paper will present normalised charts that allow for a quick and simple evaluation of chain slippage versus load, as a function of chain size and soil strength profile. Introduction It is generally accepted that drag anchors are the only types of anchor that require a specific amount of pretension on the mooring line during installation. This is to ensure that the anchor penetrates to a sufficient depth to generate the required anchoring resistance. As a consequence of having been pretensioned, the mooring system is generally proved and little additional movement or slippage of the system should result. Conversely, pile anchors are not required to be pretensioned as they can be designed to have a sufficient factor of safety against geotechnical failure under the extreme loads once installed, and therefore movement of the anchor can be prevented. In recent times the geotechnical efficiencies of embedding the point of attachment of the mooring line (on pile and plate anchors) have been exploited. This can occur in layered soil profiles, particularly with soft soil over hard soil, where it is beneficial to locate the anchor padeye near the strong stratum. Suction anchors installed into soft soils also typically have an embedded padeye (located about two thirds down the pile) to ensure the load is applied near the centre of resistance of the soil. Embedment of the anchor padeye results in a situation where significant movement or slippage of the mooring line can occur in the in-place condition as environmental loads are experienced. Yet design codes do not call for a specific level of pretension to mitigate or account for this. It is generally left to the designer to determine the sensitivity of the mooring system to slippage of the mooring line (which can result in greater excursions of the vessel and overstressing of flexible risers) and to pretension the mooring line accordingly. This paper aims to present a parametric analysis of the development of load as the mooring line cuts through the soil, enabling selection of an appropriate pretension load as a function of allowable line slippage." @default.
- W2085281808 created "2016-06-24" @default.
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- W2085281808 date "2004-05-03" @default.
- W2085281808 modified "2023-09-27" @default.
- W2085281808 title "Study of Chain Slippage for Embedded Anchors" @default.
- W2085281808 doi "https://doi.org/10.4043/16445-ms" @default.
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