Reliability of jack-ups under extreme storm conditions

Morandi, Alberto; Smith, I. A.; Virk, G.S.

doi:10.1016/s0951-8339(00)00057-5

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…Table 3 shows the list of infrastructures and facilities that repairing shipyards require. The health and safety executive (HSE) standards are among these essential items because of the importance of safety in such an environment (Thomas et al , 2019; Vrålstad et al , 2018; Morandi et al , 2001). The long list was divided into three categories by interviewing with experts to determine the importance of these requirements.…”

Section: Methodsmentioning

confidence: 99%

“…A wide range of studies have been performed in the field of drilling industry and shipyards, examined from different points of view such as maintenance and repair of jack-ups and the cost of maintenance, industry markets, shipyards, and jack-up legs’ analysis) Pisano et al , 2019; Guede, 2019; Nam et al , 2017; Li et al , 2018; Barlas and Izci, 2018; Shazzad Hosaain et al , 2018; Apergis et al , 2017; Kaiser, 2017; Ha et al , 2015; Zhao et al , 2014; Namkug and Ha, 2014; Xian-Gang and Yong, 2012; Pande et al , 2013; Perrons and Richards, 2013; Kaiser and Snyder, 2013; Cao et al , 2012; Zhang et al , 2012; Celebi and Vardar, 2008; Kaiser, 2008; Shabakhty et al , 2003; Morandi et al , 2001), which can help to understand and achieve the conclusive goal of the paper. The articles are divided into three sections, including first part: the jack-up market, second part: the jack-up R&M and third part: shipyards.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The main questions of this research are: which equipment is needed for rigs R&M, what kind of equipment the shipyard has, which equipment is more efficient and what criteria in rigs R&M are important for experts and owners. Other research has focused on repairing the jack-ups' legs, fixing the corrosion of the bodies and legs and mentioning criteria such as cost and time (Pisano et al , 2019; Guede, 2019; Shazzad Hosaain et al , 2018; Apergis et al , 2017; Kaiser, 2017; Zhao et al , 2014; Kaiser and Snyder, 2013; Xian-Gang and Yong, 2012; Pande et al , 2013; Perrons and Richards, 2013; Cao et al , 2012; Zhang et al , 2012; Kaiser, 2008; Shabakhty et al , 2003; Morandi et al , 2001), while other important criteria are not investigated. In addition, past studies have only touched on the types of shipyards and their equipment (Li et al , 2018; Nam et al , 2017; Ha et al , 2015; Namkug and Ha, 2014; Kaiser and Snyder, 2013; Cao et al , 2012; Celebi and Vardar, 2008; Celebi and Vardar, 2006) failing to survey all required equipment.…”

Section: Introductionmentioning

confidence: 99%

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Identifying the required infrastructure to improve the jack-up maintenance process based on effective criteria in the Persian Gulf

Farizhendy

Golabchi

Noorzai

2021

JFM

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Purpose The purpose of this research is to identify the effective criteria and determine the required infrastructure for the repair of drilling rigs. Design/methodology/approach The research was carried out through questionnaires and interviews with experts, including consultants, contractors and operators. A long list of the required infrastructure, dividing into three groups of vital, necessary and support, was prepared and compared with the productivity criteria. Findings The results show that it is better to prepare and upgrade the vital, necessary and supportive equipment in the shipyards, including refrigeration workshop, cofferdam for repairing spudcans and residential and educational places. Practical implications These results are helpful for the industries working on jack-ups and the countries having similar conditions to enable them to use their assets in an optimum way. Originality/value Oil drilling rigs' repair and maintenance (R&M) services are essential because of affecting the economy. Furthermore, about 25% of Iran’s oil drilling rigs are jack-up, needing overhauls every five years. Other research has investigated how to repair jack-ups, their incidents, their R&M industry market and, only in some cases mentioned, cost and time criteria. Therefore, it is necessary to identify the criteria and study the infrastructures in the shipyards.

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Section: Methodsmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identifying the required infrastructure to improve the jack-up maintenance process based on effective criteria in the Persian Gulf

Farizhendy

Golabchi

Noorzai

2021

JFM

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“…In the meantime, many literatures have been dedicated to reduce the risk and improve the reliability of the jack-up rig operations (Shaples, et al, 1989; Morandi, et al, 2001; Le Tirant and Perol, 1993).…”

Section: Introductionmentioning

confidence: 99%

Jointly-Developed Novel Torque Transducer Ensures Jack-up Rig Integrity

Wang¹,

Delves

Li³

et al. 2015

SPE/IATMI Asia Pacific Oil &Amp; Gas Conference and Exhibition

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To ensure the integrity of offshore jack-up rigs, a novel torque transducer has been developed through 18-month-long joint collaborations cross industries globally.A medium size offshore jack-up rig uses a set of fifty-four units of AC-driven jacking systems to jack the platform up and down. Due to inevitable manufacturing tolerances and poor correlation between motor current and its torque at standstill and near-zero speed, the synchronization and even load distribution among the fifty-four climbing pinions of these jacking systems has been a challenge. Uneven load sharing among these fifty-four climbing pinions can overload and then break some of them prematurely. Broken climbing pinions can result in catastrophic rig accident and human casualties.This novel torque transducer measures the climbing pinion resistant torque directly through reading the torsional deflection of the pinion precisely. A series of design verification through finite element analysis and design validations through factory acceptance tests have been conducted successfully.With this new torque transducer installed, the load on each climbing pinion can be read simultaneously and then controlled either manually or with a variable frequency drive.Different from any existing standard torque transducer mounted between electric motor and the input shaft of jacking system, this new novel torque transducer is designed to be mounted inside the climbing pinion and then reads the torque load on the pinion directly. The accuracy of this direct torque reading is regardless of the gear transmission efficiency, which, in fact, governs the reading accuracy of the current existing standard torque transducers available in the market.

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“…The scholars have paid attention to the jackup platform for a long time. Their research on the jackup include wide-ranging subjects such as the fluid-structure-soil interaction analysis (Bienen and Cassidy 2006;Gaudin et al 2011), the key substructures' strength analysis (Zhang et al 2012), fatigue and fracture analysis (Morandi et al 2001;Shabakhty 2011), the response analysis under extreme condition (Cassidy et al 2002;Tan et al 2003;Howarth et al 2004;Jensen and Capul 2006) and so on. However, the process of lifting up or down the huge, heavy legs that combine * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

Influence of the legs underwater on the hydrodynamic response of the multi-leg floating structure

Chen

Huang

et al. 2014

Ships and Offshore Structures

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The wind farm installation vessel is a floating structure with multiple legs. The legs underwater have a prominent effect on the responses of the vessel on waves. The main factor is that the existing of the legs under water leads to the hydrodynamic characteristics different from the normal vessel without legs. To analyse the influence of the legs underwater on the hydrodynamic responses, five cases are classified according to the length of the legs under water. Then, the hydrodynamic responses of the structure in different cases are numerically simulated by applying the three-dimensional potential theory. The hydrodynamic coefficients, wave excitation loads and RAOs of the six degrees of freedom in different wave frequencies are calculated and compared. The results show that the effects of the legs underwater on the hydrodynamic response of a floating structure with multiple legs are visible except for heave motion of the floating body.

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Reliability of jack-ups under extreme storm conditions

Cited by 9 publications

References 5 publications

Identifying the required infrastructure to improve the jack-up maintenance process based on effective criteria in the Persian Gulf

Identifying the required infrastructure to improve the jack-up maintenance process based on effective criteria in the Persian Gulf

Jointly-Developed Novel Torque Transducer Ensures Jack-up Rig Integrity

Influence of the legs underwater on the hydrodynamic response of the multi-leg floating structure

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