Limiting motions for jack-ups moving onto location

Smith, I. A.; Lewis, Tim; Miller, Brady L.; Lai, Po-Lun; Frieze, P A

doi:10.1016/0951-8339(95)00002-n

Cited by 8 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Likewise, Smith et al (1996) provided the operational limits in terms of allowable impact velocities for a jack-up vessel during the standard leg lowering procedure. The limits were derived from structural damage criteria based on structural analyses of leg members.…”

Section: Numerical Coupled Modelsmentioning

confidence: 99%

Methodology for assessment of the operational limits and operability of marine operations

Acero

Gao

et al. 2016

Ocean Engineering

View full text Add to dashboard Cite

This paper deals with a general methodology for assessment of the operational limits and the operability of marine operations during the planning phase with emphasis on offshore wind turbine (OWT) installation activities. A systematic approach based on operational procedures and numerical analyses is used to identify critical events and corresponding response parameters. Identifying them is important for taking mitigation actions by modifying the equipment and procedures. In the proposed methodology, the operational limits are established in terms of allowable limits of sea states. In addition, the operational limits of a complete marine operation is determined by taking into account several activities, their duration, continuity, and sequential execution. This methodology is demonstrated in a case study dealing with installation of an offshore wind turbine monopile (MP) and a transition piece (TP). The developed methodology is generic and applicable to any marine operation for which operational limits need to be established and used on-board as a basis for decision-making towards safe execution of operations.

show abstract

Section: Numerical Coupled Modelsmentioning

confidence: 99%

Methodology for assessment of the operational limits and operability of marine operations

Acero

Gao

et al. 2016

Ocean Engineering

View full text Add to dashboard Cite

show abstract

“…The allowable limit of the impact velocity of the leg should be determined by a leg-soil impact analysis [22]. In this paper, this velocity is not derived but reasonably estimated based on information available [4]. For a specific allowable limit of the impact velocity and its corresponding characteristic value, a backward derivation of the corresponding H s (T p ) limit is possible [5].…”

Section: Allowable Limits Of Sea Statesmentioning

confidence: 99%

“…Instead, other environmental parameters or measurable vessel responses are desired [3]. A significant wave height (H s ) of 1.5 meters is a practical value used by the industry [4], although the origin of such limits is not clear. The H s limit is not sufficient for floating structures, and the wave spectrum peak period (T p ) needs to be considered.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on a Flopper Stopper for Leg Positioning of a Jack-Up Barge

Jiang

Acero

Gao

et al. 2017

Volume 9: Offshore Geotechnics; Torgeir Moan Honoring Symposium

View full text Add to dashboard Cite

Jack-up barges are commonly used for marine operations in the offshore oil and gas, and offshore wind industries. A critical phase within the marine operation activities is the positioning of the jack-up legs onto the seabed. During this process, large impact velocities and forces may arise from the barge's heave, roll and pitch motions, and structural damage of the legs can occur. This paper numerically investigates the effect of a flopper stopper (FS) on the motion responses of a jack-up barge from the offshore wind industry. The FS is known as a passive roll compensation device. It is suspended from the side of the barge by means of wire ropes and cantilever beams. A simple geometry of an FS is proposed, and the working principle introduced. For the loading condition before the leg-soil impact occurs, global dynamic analyses of the coupled system are conducted. Characteristic values of impact velocities are used to establish the jack-up operational limits in terms of the significant wave height and peak period. By comparing the operational limits for the barge with and without FS, it is found that FS should be placed on the weather side. At beam seas, the current FS can lead to a maximum increase in the operational wave height limit of 35%, whereas for the other wave headings, it may not be beneficial to use FS.

show abstract

Marine Warranty Survey for Jack‐Ups

Morandi

2017

Encyclopedia of Maritime and Offshore Engineering

View full text Add to dashboard Cite

show abstract

Limiting motions for jack-ups moving onto location

Cited by 8 publications

References 2 publications

Methodology for assessment of the operational limits and operability of marine operations

Methodology for assessment of the operational limits and operability of marine operations

A Numerical Study on a Flopper Stopper for Leg Positioning of a Jack-Up Barge

Marine Warranty Survey for Jack‐Ups

Contact Info

Product

Resources

About