The Experts below are selected from a list of 93 Experts worldwide ranked by ideXlab platform
J.p. Labbé - One of the best experts on this subject based on the ideXlab platform.
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Ekpe Gas Compression Project - Float-Over Deck Installation
All Days, 1998Co-Authors: J.p. Labbé, V. Allègre, J. Volker, F. AgdernAbstract:Abstract ETPM successfully installed the Ekpe Gas Compression deck offshore Nigeria for the NIGERIA NATIONAL PETROLEUM CORPORATION AND MOBIL PRODUCING NIGERIA JOINT VENTURE in June 1997, using for the first time the shockless Smart-Leg system. The Ekpe Gas compression platform is located in a water depth of 50 meters and is subjected to long period swell conditions common to offshore West Africa, which causes the movements of Cargo Barges to have large amplitudes. This activity involved positioning the Cargo Barge within the jacket structure, centering the deck over the piled jacket, and mating the legs of the 4 100 tonne deck to the piles. For the first time, passive hydraulic devices were used to neutralize the vertical movements of the Barge and to transfer the deck weight from the Cargo Barge to the piled jacket structure. The Smart-Leg jacks allowed the mating of each deck leg onto the corresponding jacket pile to take place at the precise time when the deck leg vertical speed is zero, therefore eliminating the kinetic energy and the risk of impact. The deck mating was completed in a few seconds, less than the swell period. After the deck was installed, all the hydraulic devices were retrieved, ready to be used for another project. This paper presents the installation procedures, an operational description of the major hardware employed, and details of the on-site monitoring systems used to accomplish float-over deck installation. Factors which influenced the selection of the float-over installation method are also discussed. Introduction In 1993, Smart-Leg existed only as a concept patented by ETPM. It took 4 years to develop the system, build the equipment and perform the first operation. The advantages of the integrated deck concept for large offshore platforms are well known. These decks, however, can be quite heavy and some areas in the world may be far away from the usual operating scenes of the large crane vessels necessary if a conventional lift technique is selected for the installation. Floatation methods offer an alternative solution for installation, but few methods permit the installation of heavy integrated deck in long swells where the movements of the Cargo Barge have large amplitudes. Floatation methods are limited by the difficulty of maintaining the Cargo Barge steady inside the jacket or by the shocks to be absorbed during the mating operation. Rather than absorbing the shocks, the Smart-Leg floatation method aims at eliminating them. Passive and retrievable jacks are used to progressively freeze the motion of the Cargo Barge, thus allowing a very large deck to be installed in significant swell conditions. During the abandonmentphase, the deck can be removed by reversing the operation. Offshore West Africa, the crane capacity of local construction vessels is a limitation to heavy deck installation. For a deck installation above 1,200 tonne, one would have to mobilize a heavy duty Semisubmersible Crane Vessel (SSCV) from the North Sea, where these units normally are located. ETPM was determined to find an alternative to using SSCVs, and preferably a solution that can accomodate a wide range of deck sizes and seastate condition.
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Smart. Leg : A New Method for Heavy Deck Offshore Installation
All Days, 1996Co-Authors: J.p. Labbé, J.l. Legras, R.g. StandingAbstract:Abstract A new shock less flotation method, called Smart-. Leg, developed by ETPM, is presented for the installation of a heavy deck on a jacket in open sea using a conventional Cargo Barge and specific recoverable devices, The details and advantages of the method are discussed. The paper also summarizes the dynamic analyses carried out to assess the efficiency of the specific devices; one is mounted on the Barge and designed to stabilize it inside the jacket and another one is fitted inside the deck legs and designed to land the deck smoothly on the jacket. The advantages of the integrated deck concept for large offshore platforms have been widely publicized. However, so far, the installation of heavy decks in open sea using the floatation method has been limited either by the shocks to be absorbed during the mating operation or by the difficulty of maintaining the Barge steady inside the jacket. With the new method and associated equipment, mating shocks are virtually eliminated and the Barge is smoothly and steadily maintained within the jacket. The system allows, a deck weighing up to 20,000 tons to& installed in a 2m / 10s heading swell, The results of the numerical analyses performed provide crucial data on motions and forces for the design of the new flotation method. The prototype tests (scale 1/4) give precise indications about Smart-Leg parameters and the tank tests (scale 1/40) enable validation of the numerical analysis. Introduction Few methods permit the installation of heavy integrated decks offshore particularly in long swell seas where the ergo Barge movements have high amplitudes. Smart-. Leg is the floatation method that can install the heaviest integrated deck in open sea using only a conventional Cargo Barge and specific reusable equipment. With Smart- Leg and the accompanying stabilization devicesSmart- Fin, and Smart-Fender shocks during mating and Barge immobilization are eliminated, As a result, a deck weighing more than 20,000 t ean be installed in a 2rn/10s swell. The principle used by Smart-. Leg devices is that whatever the size and mass of a heaving, surging or swaying body, its kinetic energy is zero when its velocity is zero. Smart-Leg, Smart-Fin and Smart-Fender are based on a jacking device that um detect the outward zero speed of the ram and maintain that ram position. A non-return valve located between the high pressure chamber (ram side) and the low pressure accumulator of the jacking device seines both purposes, Another advantage of the Smart-Leg system is that the reverse operation (deck removal) is possible using the same principle and therefore without any shock. The principle of Smart-Leg has already been validated inshore during the installation of the main girders of the Prince Edward Island bridge. Each of the 5 girders already installed weighs more that 7000 t. The first Smart-Leg equipment will be ready for an offshore installation early 1997 and able to install a deck in the weight range 3500 t to 6000 t,
J.l. Legras - One of the best experts on this subject based on the ideXlab platform.
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Smart?Leg Computations Validated During the Ekpe Gas Compression Project Float-over Deck Installation
All Days, 1998Co-Authors: J.l. Legras, V. Bouyssy, E. BerekAbstract:Abstract The Smart?Leg system developed by ETPM ensures the shockless float-over installation of heavy fully-commissioned integrated decks on offshore jacket structures. ETPM successfully installed the Ekpe Gas Compression deck offshore Nigeria in June 1997, using, for the first time, the Smart?Leg float-over system. Two years before, ETPM undertook a program of numerical simulations and model test work as part of the development of the system. The numerical program was validated against the basin model test results. The design of the Ekpe deck, the Cargo Barge, and the Smart-Leg equipment was based on extensive numerical simulations performed with the Smart?Leg software. A detailed weather analysis and forecast were conducted during the Ekpe deck installation. Furthermore measurements of environment, Barge motion and pressure and stroke of Smart?, Leg jacks were carried out to monitor the operation. A later study verified correlation between measured and predicted motions and forces. This paper presents the model basin test results, the calibration and computer work, and the field results from the Ekpe deck float-over installation. The results of the correlation between the predicted motions/forces and the as-measured values obtained during the float-over deck installation are presented, too. The main advantages of the method have been confirmed: smooth suppression of deck and jacket relative motion, absence of shock either horizontally or vertically, and great positioning accuracy. Introduction In June 1997, the 4,100 tonne Ekpe Gas Compression deck was successfully mated on the OY jacket using the Smart?Leg float-over system, as described in the companion paper reference [1]. The Smart?Leg float-over method is fully described in reference [2]. The main steps of the mating operation are listed below as well as the parameters that need to be evaluated in order to design structures and equipment and to define limit environmental conditions for the operation. Environmental conditions to be considered for offshore Nigeria operations include:–wind and current, although corresponding loads are much smaller than those due to waves–maximum tide of 2 meters–long swells with maximum incidence of ±20° relative to the jacket longitudinal axis–wind generated waves from any direction Analytical Work and Design Procedure Several computer programs have been used to check the feasibility of the mating operation. The main software is a new time domain simulation program developed by BMT [2] to describe the dynamic behavior in regular and irregular waves of three bodies: the Barge, the deck and the jacket linked by the "Smart" components - i.e. the Smart?Fins, Smart?Fenders, Smart?Legs and Smart?Shoes - with their complex mechanical and structural characteristics. Other programs are MOSES commonly used for the simulation of marine operations and structural verifications, and FASTRUDL, a general purpose structural program. Vertical clearance between jacket and deck Legs. It is essential to be sure that there is no risk of shock between jacket and deck until the deck legs are immobilized. This was ensured by first designing the Smart?Leg system to leave enough clearance between the deck bottom and the jacket top, based on the numerical simulation results, and then by measuring, during the installation at the site, the heave motions prior to the beginning of the mating operation.
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Smart. Leg : A New Method for Heavy Deck Offshore Installation
All Days, 1996Co-Authors: J.p. Labbé, J.l. Legras, R.g. StandingAbstract:Abstract A new shock less flotation method, called Smart-. Leg, developed by ETPM, is presented for the installation of a heavy deck on a jacket in open sea using a conventional Cargo Barge and specific recoverable devices, The details and advantages of the method are discussed. The paper also summarizes the dynamic analyses carried out to assess the efficiency of the specific devices; one is mounted on the Barge and designed to stabilize it inside the jacket and another one is fitted inside the deck legs and designed to land the deck smoothly on the jacket. The advantages of the integrated deck concept for large offshore platforms have been widely publicized. However, so far, the installation of heavy decks in open sea using the floatation method has been limited either by the shocks to be absorbed during the mating operation or by the difficulty of maintaining the Barge steady inside the jacket. With the new method and associated equipment, mating shocks are virtually eliminated and the Barge is smoothly and steadily maintained within the jacket. The system allows, a deck weighing up to 20,000 tons to& installed in a 2m / 10s heading swell, The results of the numerical analyses performed provide crucial data on motions and forces for the design of the new flotation method. The prototype tests (scale 1/4) give precise indications about Smart-Leg parameters and the tank tests (scale 1/40) enable validation of the numerical analysis. Introduction Few methods permit the installation of heavy integrated decks offshore particularly in long swell seas where the ergo Barge movements have high amplitudes. Smart-. Leg is the floatation method that can install the heaviest integrated deck in open sea using only a conventional Cargo Barge and specific reusable equipment. With Smart- Leg and the accompanying stabilization devicesSmart- Fin, and Smart-Fender shocks during mating and Barge immobilization are eliminated, As a result, a deck weighing more than 20,000 t ean be installed in a 2rn/10s swell. The principle used by Smart-. Leg devices is that whatever the size and mass of a heaving, surging or swaying body, its kinetic energy is zero when its velocity is zero. Smart-Leg, Smart-Fin and Smart-Fender are based on a jacking device that um detect the outward zero speed of the ram and maintain that ram position. A non-return valve located between the high pressure chamber (ram side) and the low pressure accumulator of the jacking device seines both purposes, Another advantage of the Smart-Leg system is that the reverse operation (deck removal) is possible using the same principle and therefore without any shock. The principle of Smart-Leg has already been validated inshore during the installation of the main girders of the Prince Edward Island bridge. Each of the 5 girders already installed weighs more that 7000 t. The first Smart-Leg equipment will be ready for an offshore installation early 1997 and able to install a deck in the weight range 3500 t to 6000 t,
E. Berek - One of the best experts on this subject based on the ideXlab platform.
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Smart?Leg Computations Validated During the Ekpe Gas Compression Project Float-over Deck Installation
All Days, 1998Co-Authors: J.l. Legras, V. Bouyssy, E. BerekAbstract:Abstract The Smart?Leg system developed by ETPM ensures the shockless float-over installation of heavy fully-commissioned integrated decks on offshore jacket structures. ETPM successfully installed the Ekpe Gas Compression deck offshore Nigeria in June 1997, using, for the first time, the Smart?Leg float-over system. Two years before, ETPM undertook a program of numerical simulations and model test work as part of the development of the system. The numerical program was validated against the basin model test results. The design of the Ekpe deck, the Cargo Barge, and the Smart-Leg equipment was based on extensive numerical simulations performed with the Smart?Leg software. A detailed weather analysis and forecast were conducted during the Ekpe deck installation. Furthermore measurements of environment, Barge motion and pressure and stroke of Smart?, Leg jacks were carried out to monitor the operation. A later study verified correlation between measured and predicted motions and forces. This paper presents the model basin test results, the calibration and computer work, and the field results from the Ekpe deck float-over installation. The results of the correlation between the predicted motions/forces and the as-measured values obtained during the float-over deck installation are presented, too. The main advantages of the method have been confirmed: smooth suppression of deck and jacket relative motion, absence of shock either horizontally or vertically, and great positioning accuracy. Introduction In June 1997, the 4,100 tonne Ekpe Gas Compression deck was successfully mated on the OY jacket using the Smart?Leg float-over system, as described in the companion paper reference [1]. The Smart?Leg float-over method is fully described in reference [2]. The main steps of the mating operation are listed below as well as the parameters that need to be evaluated in order to design structures and equipment and to define limit environmental conditions for the operation. Environmental conditions to be considered for offshore Nigeria operations include:–wind and current, although corresponding loads are much smaller than those due to waves–maximum tide of 2 meters–long swells with maximum incidence of ±20° relative to the jacket longitudinal axis–wind generated waves from any direction Analytical Work and Design Procedure Several computer programs have been used to check the feasibility of the mating operation. The main software is a new time domain simulation program developed by BMT [2] to describe the dynamic behavior in regular and irregular waves of three bodies: the Barge, the deck and the jacket linked by the "Smart" components - i.e. the Smart?Fins, Smart?Fenders, Smart?Legs and Smart?Shoes - with their complex mechanical and structural characteristics. Other programs are MOSES commonly used for the simulation of marine operations and structural verifications, and FASTRUDL, a general purpose structural program. Vertical clearance between jacket and deck Legs. It is essential to be sure that there is no risk of shock between jacket and deck until the deck legs are immobilized. This was ensured by first designing the Smart?Leg system to leave enough clearance between the deck bottom and the jacket top, based on the numerical simulation results, and then by measuring, during the installation at the site, the heave motions prior to the beginning of the mating operation.
F. Agdern - One of the best experts on this subject based on the ideXlab platform.
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Ekpe Gas Compression Project - Float-Over Deck Installation
All Days, 1998Co-Authors: J.p. Labbé, V. Allègre, J. Volker, F. AgdernAbstract:Abstract ETPM successfully installed the Ekpe Gas Compression deck offshore Nigeria for the NIGERIA NATIONAL PETROLEUM CORPORATION AND MOBIL PRODUCING NIGERIA JOINT VENTURE in June 1997, using for the first time the shockless Smart-Leg system. The Ekpe Gas compression platform is located in a water depth of 50 meters and is subjected to long period swell conditions common to offshore West Africa, which causes the movements of Cargo Barges to have large amplitudes. This activity involved positioning the Cargo Barge within the jacket structure, centering the deck over the piled jacket, and mating the legs of the 4 100 tonne deck to the piles. For the first time, passive hydraulic devices were used to neutralize the vertical movements of the Barge and to transfer the deck weight from the Cargo Barge to the piled jacket structure. The Smart-Leg jacks allowed the mating of each deck leg onto the corresponding jacket pile to take place at the precise time when the deck leg vertical speed is zero, therefore eliminating the kinetic energy and the risk of impact. The deck mating was completed in a few seconds, less than the swell period. After the deck was installed, all the hydraulic devices were retrieved, ready to be used for another project. This paper presents the installation procedures, an operational description of the major hardware employed, and details of the on-site monitoring systems used to accomplish float-over deck installation. Factors which influenced the selection of the float-over installation method are also discussed. Introduction In 1993, Smart-Leg existed only as a concept patented by ETPM. It took 4 years to develop the system, build the equipment and perform the first operation. The advantages of the integrated deck concept for large offshore platforms are well known. These decks, however, can be quite heavy and some areas in the world may be far away from the usual operating scenes of the large crane vessels necessary if a conventional lift technique is selected for the installation. Floatation methods offer an alternative solution for installation, but few methods permit the installation of heavy integrated deck in long swells where the movements of the Cargo Barge have large amplitudes. Floatation methods are limited by the difficulty of maintaining the Cargo Barge steady inside the jacket or by the shocks to be absorbed during the mating operation. Rather than absorbing the shocks, the Smart-Leg floatation method aims at eliminating them. Passive and retrievable jacks are used to progressively freeze the motion of the Cargo Barge, thus allowing a very large deck to be installed in significant swell conditions. During the abandonmentphase, the deck can be removed by reversing the operation. Offshore West Africa, the crane capacity of local construction vessels is a limitation to heavy deck installation. For a deck installation above 1,200 tonne, one would have to mobilize a heavy duty Semisubmersible Crane Vessel (SSCV) from the North Sea, where these units normally are located. ETPM was determined to find an alternative to using SSCVs, and preferably a solution that can accomodate a wide range of deck sizes and seastate condition.
Hesty Anita Kurniawati - One of the best experts on this subject based on the ideXlab platform.
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desain deck Cargo Barge sebagai arena konser terapung untuk daerah perairan gili trawangan gili meno gili air lombok
Jurnal Teknik ITS, 2019Co-Authors: Dwi Andrey Prayogo, Hesty Anita KurniawatiAbstract:Nusa Tenggara Barat merupakan salah satu provinsi yang memiliki keragaman flora dan fauna yang beraneka ragam. Deck Cargo Barge atau tongkang banyak yang sudah tidak beroperasi dan diparkir dikarenakan sumber daya alam berupa batu bara mulai menipis. Dengan mendesain tongkang sebagai arena konser terapung nantinya bisa menjadi referensi bagi pemilik kapal mengenai alih fungsi tongkang karena berkurangnya sumber daya alam. Dari proses analisis teknis didapatkan ukuran utama yang sesuai untuk arena konser terapung adalah L=96 m, B=24 m, H=6.6 m, T=5 m. Desain safety plan ditambahkan pada The Kahakai Floating Arena (TKFA) adalah 1119 lifejacket, 12 lifebuoy dan 24 liferafts. Garbage disposal management menggunakan compactor yang diperuntukkan untuk sampah non-organic, comminuter dan macerator diperuntukkan untuk sampah organik. Sewage treatment management menggunakan comminuter dan penyediaan holding tank. Konfigurasi mooring system yang digunakan adalah spread mooring system dikombinasi dengan mooring buoy dengan symmetric 8 line (45°) dan mooring line berupa wire rope . Besarnya biaya pembangunan TKFA adalah sebesar Rp 34,356,976,561.92 dengan estimasi PP terjadi pada tahun ke 6 bulan ke 7 operasional serta nilai NPV sebesar Rp 25,306,981,018 dan IRR sebesar 24.73% untuk jangka waktu investasi selama 10 tahun.