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30 October 2018, Volume 5 Issue 增刊 Previous Issue    Next Issue

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Prediction of Natural Gas Hydrate Dessert Reservoir Based on Attribute Fusion Technology — Take Area A of Southwest Tai Basin in the South China Sea as an Example LI Zhan-dong, GU Ya-ping, LIU Yi-kun, WANG Ke-liang, ZHOU Zhi-jun, WU Jing-chun, LI Wei 2018, 5 (增刊):  1-5.  Abstract ( 135 )   PDF (7066KB) ( 41 )   The geological conditions in the southwest Tai basin of the South China Sea are complex and it is difficult to predict the hydrate dessert reservoir. In order to achieve the purpose of effectively depict the dessert reservoir, in southwest Tai basin area A test area, this paper mainly adopts a corresponding key technology, seismic attribute fusion technology, and expounds the multiple iterations and classification attribute fusion technology process. On this basis, we carry out amplitude, frequency, phase properties fusion for the experimental zone, and combine the earthquake as the bottom reflection characteristics of BSR, implement the effective dessert area A hydrate reservoir characterization. This method can be used as a hydrate dessert reservoir characterization of effective technical means. For the next step in the southwest Tai basin in the South China Sea it points out the direction of the hydrate exploration. Related Articles | Metrics

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Study of Wind Load Calculation Based on Moses FU De-jian, FENG Shi-lun, ZHANG Yuan-bo, MAO Jian-bin 2018, 5 (增刊):  6-9.  Abstract ( 261 )   PDF (857KB) ( 135 )   Wind load is an important part of the environmental load on offshore platforms. Therefore, how to accurately and effectively apply wind loads to offshore platforms is required when checking offshore platforms for stability and safety. This paper points out the calculation method the wind loads in Moses software, shows some important parameters that affect the wind load in Moses, and puts forward how to set up the wind load conforming to the requirements of ABS and API rules. It has important reference value for wind load calculation on Moses in the future. Related Articles | Metrics

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Influence of Shallow Gas Formation in the Bohai Sea on Penetration of Jack-up Drilling Platform MA Yong-qi, YANG Jin, SHI Shan-shan, HU Nan-ding, YANG Guo-dong, LIU Xun 2018, 5 (增刊):  10-14.  Abstract ( 199 )   PDF (3485KB) ( 94 )   For the Bohai Sea drilling platform in the penetration encountered in the process of the shallow gas reservoirs with different degree of bubbles phenomenon, based on the characteristics of shallow gas release during on-site exploration in the Bohai Sea, it should be believed that the main factor of shallow gas release is the original gas stress destroyed by the platform leg. The shallow gas release is the seepage failure process of the unsaturated soil when the permeability ratio of the gas-bearing soil layer exceeds the critical pressure drop of the gas pressure. It mainly affects the structural damage and disturbance of the stratum soil. The disturbed stratum of the inserted penetration is mainly divided into four areas, including high disturbance area, medium disturbance area, weak disturbance area and non-disturbance area. The collapse of the clay layer and the sand layer in the Bohai Sea will cause the soil layer to be severely disturbed, which will greatly reduce the bearing capacity of the penetration foundation, the sinking of the penetration legs or the uneven settlement of the soil layer. In order to prevent the platform penetration accident, the safety design under different working conditions should be taken into full consideration, so should the reasonable selection of penetration shoe area and release shallow air. Related Articles | Metrics

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Analysis of Second Order Motion Effects on a  Semi-Submersible Platform Air Gap LUO Youan, WANG Fei, WEI Wei 2018, 5 (增刊):  15-18.  Abstract ( 210 )   PDF (1596KB) ( 104 )   The problem of air gap plays an important role in the concept and structure design of semi-submersible platform. For the common business software can not get result with nonlinear waves and Second-order motion directly, this paper forecast the air gap of a semi-submersible rig in the south China sea by a self-programming. Comparing with the results of the first order and second order air gap, the paper discussed the influence factor, and give the second order air gap response of each wave direction. Related Articles | Metrics

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Experimental Study on Vortex-Induced Vibration of Cactus-Shaped Cylinder Array ZHAO Fan, LIU Yang, SHI Chen 2018, 5 (增刊):  19-25.  Abstract ( 202 )   PDF (4032KB) ( 73 )   Marine riser is a slender tube used to connect the oil platform and the subsea oil well. Under the excitation of waves and currents, risers often experience vortex-induced vibration (VIV). In deepwater oil production, several risers are often arranged into a riser array, which makes the VIV of marine risers more complicated. In this paper,cylinders of three types of cross-sectional shape, a cactus-shape, circular shape, and circular shape with strakes, are studied. VIV responses of an isolated cylinder and cylinder arrays consisting of four cylinders with a 2-by-2 arrangement were investigated. The results show that the cactus-shaped cross-section has a certain effect of suppressing VIV and can reduces the fatigue damage of the riser. Related Articles | Metrics

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Radiate Integral Method for Static Stability Analysis of Semi-Submersible LU Guang-dong, YAN Tie, SHAN Dan-dan 2018, 5 (增刊):  26-29.  Abstract ( 177 )   PDF (1108KB) ( 88 )   The analysis of static stability is an important process in the design of semi-submersible, the complexity of the geometry of semi-submersible poses difficulties for analysis of static stability. This paper describes the surface modeling technology, focus from geometry to the surfaces; in consideration of the floating platform complex geometry, proposes radiate integral, used to calculate the area of waterline, centroid of waterline, drainage volume, floating heart; A coordinate transformation algorithm based on vector projection is proposed, calculation of buoyancy parameters for tilting and draught of offshore platforms. Based on the calculation of the basic parameters of buoyancy and the transformation of coordinate system, Calculation of static stability can be calculated. Related Articles | Metrics

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Experimental Simulation Review of the Decomposition of Natural Gas Hydrate LI Ji, LI Zhan-dong, ZHANG Hai-xiang 2018, 5 (增刊):  30-33.  Abstract ( 177 )   PDF (826KB) ( 107 )   As a potential alternative energy source, gas hydrate has attracted more and more attention with the breakthrough of mining technology. However, there are many obstacles to large-scale mining of such enormous potential resources. Due to the complicated environment of marine gas hydrate. High technical requirements for drilling and cost so much, pre-production needs careful carefully. Experimental research on various mining techniques in the laboratory, and discuss the applicable conditions, technical parameter, advantages and disadvantage of various mining techniques, these provide the reference for the actual development and utilization of gas hydrate, is undoubtedly the most economical and effective way. Therefore, from the simulation experiments of gas hydrate formation with various components, verifying the forming conditions and influencing factors. And then quantitatively evaluate the gas hydrate decomposition experiment, including three mining techniques, methanol injection method, step-down method and thermal excitation method, which affect the decomposition law, influencing factors and decomposition rate. Related Articles | Metrics

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Yaw Hydrodynamic Performance of Marine Current  Turbine Based on Overlap Grid Method LIU Yao, CAI Wei-jun, YI Jin-bao 2018, 5 (增刊):  34-39.  Abstract ( 125 )   PDF (6960KB) ( 51 )   In order to realize the yaw hydrodynamic performance monitoring of passively rotating turbine, DFBI （dynamic fluid body interaction） simulation method based on overlap grid is used in this paper, the influence of hydrodynamic change of flow direction on yaw hydrodynamic performance of marine current turbine, and put forward stern rudder in order to optimize turbine structure, make a contrastive study of different stern rudder. The result shows that the change of flow direction led to the energy efficiency drop, installation of stern rudder can realize the turbine runs in the direction of the flow, and effectively improving the hydrodynamic performance of turbine. In low velocity environment, the rudder which area is 10% of flow area of turbine can improve the hydrodynamic performance of turbine greatly, it is suitable for the rudder of turbine. Related Articles | Metrics

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Study on Installation Technology for Anchor Pile of  CALM Type Single Point Mooring System LI Qi-bao, YU Liang, LIU Bin 2018, 5 (增刊):  40-43.  Abstract ( 277 )   PDF (4252KB) ( 69 )   Catenary anchor leg mooring (CALM) type single point mooring system has been widely used internationally. It is mainly used for the transfer of oil; Oil is transported from the tanker to the land terminal through this system, for example, Guangxi Maoming CALM type single point mooring system and Weizhou CALM type single point mooring system. The system is generally fixed on the sea by six anchor chain legs that are distributed at an angle of 60 degrees. Most of the anchor chain legs are composed of anchor piles and anchor chains. The anchor piles are generally steel piles made of steel. Because the anchor pile is independent on the seabed, how to ensure the installation accuracy during offshore installation to meets the design requirements is the main difficulty. This article studies the installation technology of this kind of anchor pile, and is applied by similar projects. Related Articles | Metrics

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Research on Properties and Manufacturing Technology of  the Casing Pipe Tensioner Hydraulic Cylinder ZHANG Chang-hua, DU Hao-bin, MEI Bo 2018, 5 (增刊):  44-47.  Abstract ( 250 )   PDF (1844KB) ( 120 )   The casing pipe tensioner hydraulic cylinder transfer the force to the casing pipe through Slips and provide the casing pipe with continuous top tension. The casing pipe tensioner hydraulic cylinder is a key part of the casing pipe tensioner system. The casing pipe tensioner hydraulic cylinder is highly valued by the domestic and foreign offshore drilling manufacturers because of its performance and manufacturing quality are related to the stability and safety of the casing pipe. Combine with the working parameters and properties requirements of a foreign casing pipe tensioner hydraulic cylinder，the manufacturing and detection technology which are easy to realize are used to solve the technique target of the hydraulic cylinder. The test results show that the hydraulic cylinder meets the practical application requirements on the properties requirements. Related Articles | Metrics

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Flow Induced Vibration Analysis for Subsea Piping ZHOU Kai 2018, 5 (增刊):  48-52.  Abstract ( 319 )   PDF (3097KB) ( 183 )   It will be more and more important for design of subsea production system that internal flow induced vibration. Research on mechanisms of flow induced vibration in piping systems and general FIV sources. The screening approach used for subsea is based on the Guidelines for the avoidance of vibration induced fatigue failure in process pipework (AVIFF). The flow induced vibration analysis mainly research on calculation of likelihood of failure (LOF). The standard assessment flowchart for flow induced vibration. Flow induced pulsations and vibrations can cause serious design and production problems, especially in subsea gas production systems. The paper research on flow induced vibration of M type jumper in a gas field of South China Sea. The analysis method of flow induced vibration is described. Researching on flow induced vibration on the LOF in different flow velocities. The well jumpers vibration modes and frequency of the pipe system be used the finite element method to analyze. At last, the document shows that how can to develop FIV technology in future. Related Articles | Metrics

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Application of Flexible Pipe in Deepwater Subsea Pipeline LUO Shi-yong, WANG De-jun, LIU Xiao-xia, HUANG Jun 2018, 5 (增刊):  53-56.  Abstract ( 309 )   PDF (3465KB) ( 64 )   Deepwater subsea pipeline encounter many challenges, such as conveying hige temperature, high pressure and corrosion fluid, suffering complex geotechnical conditions and variable submarine topography and geomorphology characteristics, using expensive installation barge and equipement. According to subsea pipeline structural design in South China Sea and compared with rigid pipeline, details the advantages and disadvantages of flexible pipe in subsea pipeline design, installation and maintenance, and this will be contribute to the material selection of deepwater subsea pipeline. Related Articles | Metrics

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Design and Application of DBB Double Ball Valve in Offshore Oil Platform Manifold HAN Xu 2018, 5 (增刊):  57-59.  Abstract ( 177 )   PDF (1019KB) ( 92 )   Manifold is a very common key equipment and facilities for offshore oil platforms. This paper analyzes the examples of domestic offshore platform engineering projects, and elaborates on the complex form design of replacing multiple valve connections in the internal pipeline of traditional manifolds with DBB double ball valves. Optimized design of the oil platform manifold skid. Emphasis is placed on its application advantages and promotion value in reducing the material cost of the project, reducing the weight of the pipe, reducing the construction period, saving the cost of the construction link and improving the quality of the life cycle of the management products. Related Articles | Metrics

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Analysis and Software Design of Umbilical Super Duplex Tube XIE Peng, LIU Hao, YANG Qing-shu 2018, 5 (增刊):  60-64.  Abstract ( 251 )   PDF (4382KB) ( 111 )   The calculation of Von Mises Stress, collapse, buckling propagation and accumulated plastic deformation is studied for super duplex tube of subsea umbilical. A calculation software is worked out, which is able to design and verify the parameters for umbilical super duplex tube. Related Articles | Metrics

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Small Groove SMAW Process Experiment Investigation in Deepwater Subsea Pipeline Welding WANG Chao 2018, 5 (增刊):  65-68.  Abstract ( 240 )   PDF (864KB) ( 97 )   SMAW has the characteristics of strong adaptability and easy operation，so it is widely used in deepwater subsea pipeline welding and laying. However, the traditional SMAW has the disadvantages of large metal filling amount and low efficiency, so this article describes a new small groove SMAW process experiment investigation in deepwater submarine pipeline welding, and compares its advantages, it carried on various mechanical capability test of the DNV SMLS 450 welded joint, all performance indexes meet the requirements of deepwater subsea pipeline design standards. The research results show that this technology can be popularized and applied in deepwater subsea pipeline welding construction. Related Articles | Metrics

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Air Ballast System Design of Semi-Submersible Ships ZHANG Li-yuan, DONG Yuan-ping, ZHU Dan-hong, LI Ji 2018, 5 (增刊):  69-74.  Abstract ( 259 )   PDF (2323KB) ( 94 )   The pump adopted by the traditional ballast system, can't fulfill the ballast velocity requirement of man-sized Semi-submersible ships. The compressors have more advantage than the pumps in capacity and size, so large Semi-submersible ships adopt the compressor to complete the ballast and de-ballast. This method shortens the ballast and de-ballast time immensely if the ships sail in the sea, then eventually reduces the ships' work risk and cost. The air ballast system of 50 000 t Semi-submersible ship explained by this article, mainly includes such parts as compressor system, ballast cabin, ballast pipeline system, liquid level measurement system, valve control system and loading computing system. Meanwhile, the ship has completed many international and domestic tasks. The result proves this air ballast system is perfect. Related Articles | Metrics

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Analysis and Application of Frequency Control Technique in Gas Compressor Skid of Offshore Oil Platform LU Ying-chuang, ZHANG Lei, XIE Shao-jie, HUANG Yi-fei, CHENG Ji-lin, WANG Li-kun 2018, 5 (增刊):  75-79.  Abstract ( 205 )   PDF (2616KB) ( 86 )   Variable frequency speed control technology is the technical measures for the intelligent control of AC motor, frequency conversion technology in the air compressor in an application form, the excellent control ability, wide adaptability, especially in offshore oil platform on power supply and demand tension can greatly reduce air compressor power consumption and achieve the purpose of energy conservation, improve the safety factor of the air compressor operation, and has good economic benefits and development prospects. Related Articles | Metrics

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A Submarine Pipeline Height Measurement Method under Shallow Water Conditions DAI Yuan, FENG Hu, YUAN Chao-gang, WANG Yan-tao, FAN Qiang 2018, 5 (增刊):  80-82.  Abstract ( 167 )   PDF (1971KB) ( 75 )   In the construction of submarine pipeline, the conventional measurement method of pipeline buried depth is to use the survey ship. But the survey ship method requires at least 2.5 meters water depth condition, it’s unable to use this measurement method for shallow water areas and tidal flats. This paper proposes a submarine pipeline height measurement method under shallow water conditions, which can realize the height measurement of pipeline during underwater, to monitor the construction quality and auxiliary construction. Related Articles | Metrics

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Discussion on the Destruction of Offshore Platform Induced by Bohai Sea Ice and Countermeasures for Reducing Disasters ZHANG Yong-wei 2018, 5 (增刊):  83-86.  Abstract ( 345 )   PDF (1016KB) ( 338 )   Large amount of oil and gas resources are stored in Bohai, the annual sea ice in winter has influenced the normal production and development of the offshore platform. The influence factors are various：including impact force produced by floating ice, extrusion pressure produced by the whole ice, friction between sea ice and jacket as well as ice-induced vibration. To reduce the disasters brought by sea ice, recommendations are introduced： increase research and development on the ice-resistant structures, improve the design load of the jacket and establish detection and emergency response mechanism on sea ice gradually. Related Articles | Metrics

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Design and Practice of LNG Module Tertiary Structure in  Arctic Region WANG Kuo, ZHANG Shuai, QIN Jiang, LIU Lei, XU Xin-gang, GUAN Hong-sen 2018, 5 (增刊):  87-92.  Abstract ( 155 )   PDF (6879KB) ( 61 )   This paper introduces the design and practice of LNG module tertiary structure in arctic region, according to one arctic region LNG project, and describes the tertiary structure design characteristics of this project through comparison, the tertiary structure design flow and consideration factors are analyzed. With the Russian rules and SACS software, taking a access platform as an example, using the limit state design method to check, the strength check and results under different working conditions are analyzed. Suggestions are given for design and construction stages in similar projects. Related Articles | Metrics

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Research on LNG Pipeline Flange Integrity Management Technology TIAN Chong 2018, 5 (增刊):  93-98.  Abstract ( 245 )   PDF (4049KB) ( 125 )   This paper mainly introduce the LNG piping flange joint installation technology and management requirements, in order to function modules operating in the later production, maintenance, and any modification work can manage the flange node data maintenance and ensure the integrity of the flange joint . The leakage accident of flange connection system will cause inestimable great economic loss, so the effective management of flange installation is an important link to avoid leakage in the use process. Flange integrity management is for all fixed flange joints and should not be damaged intentionally during construction. This paper mainly introduce how the pipe system in the precast construction joint of flange management right, from the applicable scope, process principle, construction process, operating key points, main equipment and materials, quality control and so on several parts is introduced, to guide the construction process of flange connection. Related Articles | Metrics

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Status Analysis and Functional Design of the Commissioning Management System for Offshore Oil and Gas Project WANG Peng-cheng 2018, 5 (增刊):  99-102.  Abstract ( 163 )   PDF (825KB) ( 84 )   Through analyzing the existing project management system and referencing the commissioning function module design of offshore oil and gas engineering project, forming a set of basis for establishment which functions are targeted on commissioning information management system. In the process of actual construction, the management elements and contents of each link of the whole process of commissioning are incorporated into the management system, so as to realize informatization, systematization and internationalization of commissioning management. Related Articles | Metrics

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Solution for Underwater Inspection and Repair of Jack-Up Rigs During Service at Well Position XU Tao 2018, 5 (增刊):  103-106.  Abstract ( 172 )   PDF (1411KB) ( 53 )   Due to the limitation of jack-up rig operational characteristics, underwater structure inspection and repair are often needed during the operation service at well position. How to complete this kind of work quickly, economically and safely is an engineering problem that the offshore petroleum industry is faced with. In this paper, aiming at providing a solution for underwater inspection and repair problem of the jack-up rig, an offshore operation technique of “jack-up at well position, lifting leg alternately” is put forward, which can satisfactorily solve the problem of underwater survey in lieu of dry-dock survey of the jack-up rig and underwater structure repair during operation service at well position. Related Articles | Metrics

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Subsea Two-Phase Wetgas Flow Meter Technology Verification HE Guang-tao, LI Tao 2018, 5 (增刊):  107-112.  Abstract ( 128 )   PDF (3849KB) ( 70 )   Subsea two-phase wetgas flow meter is the first domestically developed flow measurement device based on ultrasonic technology, is a key equipment for marine oil underwater production systems, which can overcome the large deep water pressure, high seal requirements, strong corrosion, strong pressure and large range of flow changes and other harsh conditions, the organic combination of differential pressure and velocity flow measurement principle is realized by using Venturi technology and ultrasonic technology, and flow measurement can be realized without separation of gas and liquid. As a key technological equipment for deep-sea development, it has broken the technological monopoly of the same equipment in foreign countries and reached the advanced level in the world due to its low cost and good sealing performance. In its development process, China Classification Society (CCS) Tianjin Branch participated in its inspection and equipment certification. As there is no complete referable inspection basis in China, in the process of design, production and test, the standard collection and summary are also carried out, and every inspection work is fully implemented.In this paper, several typical test procedures are described, the relevant procedures and points are introduced, related standards are sorted out, a preliminary verification system of the Classification Society is formed, it also ensures that the subsea twophase wetgas flow meter can meet the research and development requirements. Related Articles | Metrics

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Development Status and Key Technology Research of Subsea Gas Compressor FAN Wen-bin, GONG Jian-chun, ZHAO Bo, FENG Jin-qiang 2018, 5 (增刊):  113-117.  Abstract ( 282 )   PDF (4896KB) ( 136 )   The technology of subsea gas compressor has provided a new development direction for deep sea oil and gas resources exploitation. Its technical theory has matured and is gradually being put into commercial application. This paper introduces the advantages of subsea gas compressors, expounds the development and application of subsea gas compressors technology, including MAN, OneSubsea, GE’s subsea gas compressors technology development status, and its application in Asgard project, Gulfaks project and Ormen Lange project respectively. The key technology of subsea gas compressor is analyzed to provide technical reference for the future research and application of subsea gas compressor in deep water oil and gas field. Related Articles | Metrics

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Small Underwater Target Recognition Based on YOLOv3 YUAN Li-hao, ZAN Ying-fei, ZHONG Sheng-hua, ZHU Hai-tao 2018, 5 (增刊):  118-123.  Abstract ( 536 )   PDF (7614KB) ( 196 )   For the demand of autonomous recognition for small objects in subsea operations by remote operated vehicles (ROVs), a YOLOv3 algorithm based on deep learning is proposed. ROVs are trained according to neural network weight of the data collected in ROV fetching competition, in order to identify and classify small underwater objects fast and precisely, which will solve the underwater-object-recognition problem in complex and unknown subsea operation environment. The effect of algorithm learning rate on loss functions in the seafood data set is analyzed. The results show that underwater object recognition and classification of seafood based on YOLOv3 algorithm is of high real time as well as precision. The precision ratio of all objects classified reaches up to ninetynine percent, and the recall ratio is above ninety percent. The estimating speed can reach up to 35 frames per second(FPS). It also shows that adjusting learning rate during network training process can help decrease loss functions. Related Articles | Metrics

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Subsea Control Module Hydraulic Flushing Technology CHEN Jun-yi, ZHU Li-ya, HAO Fu-qiang, XIE Cheng-lin, TANG Yi-chen 2018, 5 (增刊):  124-127.  Abstract ( 212 )   PDF (2425KB) ( 91 )   The core unit of subsea production system is the subsea control module (SCM). The realization of the control function of the SCM mainly relies on the hydraulic power to provide the driving force for the subsea tree valves. According to relevant statistics, 80% of hydraulic component failures are related to the deterioration of hydraulic oil. The largest proportions of deterioration and the most likely to occur are hydraulic oils containing mechanical impurities that result in unsatisfactory cleanliness. Therefore, the flushing of the hydraulic system is an important task before the subsea control system is used. The authors of this article proposed a complete SCM hydraulic flushing process and testing standard from the perspective of the SCM hydraulic system designer and producer. The basic parameters of the required equipment were listed in detail, providing a reference for the SCM flushing work. Related Articles | Metrics

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Research on Sealing Performance of O-Ring for Deep-Sea Beacon Based on ANSYS WANG Dong-shi, ZHANG Xi, JIANG Ai-guo, FAN Zan 2018, 5 (增刊):  128-135.  Abstract ( 208 )   PDF (5044KB) ( 201 )   The O-ring sealing structure of deep-sea beacon used in oil drilling platform is taken as the research object, O-ring and its boundary conditions model is created by using finite element analysis (FEA) software ANSYS, the stress distribution of the sealing surface and Von Mises stress distribution caused by O-ring deformation are calculated under the conditions of different rubber compression ratio and working depth. Analysis shows that：increasing the O-ring compression ratio could increase the sealing surface contact stress and improve the sealing performance, however, excessive compression ratio would cause the stress relaxation of the rubber material, resulting in seal failure. As working depth increases, the sealing performance of structure would decrease. In this paper, a method of designing suitable compression ratio of O-ring by using FEA software is put forward, which can ensure that the sealing structure has good sealing performance. And the method has been successfully applied to domestic beaconof oil drilling platform, but also can provide a reference and guidance for deep-sea O-ring selection and structure design. Related Articles | Metrics

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Quality Control about the Subsea Manifold Piping System CHEN Yong-gang, PANG Pei-rong, YANG Guang, HE Xin 2018, 5 (增刊):  136-139.  Abstract ( 174 )   PDF (862KB) ( 108 )   Subsea system, as one of the primary mode of oil field development, widely researched and applied by many countries in the world, has obvious economic advantages in deep sea or marginal oil and gas field development. The oil and gas follow in subsea manifold from XMAS tree and transport to subsea pipeline. The quality of subsea manifold will affect the oil field development safety and environment. Especially the research on the subsea manifold module project, the paper introduces the quality control about the subsea manifold piping system. References and advices are provided for oil gas field development inspection, especially in deepwater environment inspection. Related Articles | Metrics

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Structural Mechanics Analysis of Equipment Side Loading Auxiliary Platform Based On SACS Software CHEN Shi-wei, LIN Zhen, GUO Hong, ZHANG Jing-ke, DENG Kai, DENG Meng-dong, LI Si 2018, 5 (增刊):  140-143.  Abstract ( 166 )   PDF (1911KB) ( 77 )   During the construction of offshore platforms, many equipment needs to be installed by side loading because of the delay of arrival time. In this paper, taking the low temperature separator of a large gas mining center platform in the South China Sea as an example, a kind of equipment side loading auxiliary platform is designed, and the mechanics analysis of the structure in different working conditions is carried out by SACS software. The results show that the strength of the auxiliary platform is satisfied with the construction requirements, the strengthening connection should be adopted between the deck and the platform. The influence law of the structural form of the supporting structure on the force is analyzed. It is found that the frame structure can effectively improve the overall strength and the anti deformation ability of the supporting structure, and can directly reduce the deformation by nearly 44%, and it has a definite reference value for the design of the auxiliary platform for equipment side loading. Related Articles | Metrics

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Calculation of Structural Modification about Accommodation on Offshore Platform Based on SACS JIANG Yu-fei , WU Bin-bin , HAN Jing-yan , SHEN Jian, LI Xiao-ming, HUANG Hai-long 2018, 5 (增刊):  144-148.  Abstract ( 275 )   PDF (1696KB) ( 102 )   The offshore oil platform whose design life is about to expire can be extended service through overall upgrading and modificating, and the structural modification about accommodation is an important part. Through the overall modeling of Suizhong 36-1A offshore platform accommodation, expounds how to design the epitaxial structure to create new rooms to expand the living area, points out the key points of modeling used by SACS software, and analyzes how to set up the load of operating condition and extreme condition, at last, calculates the strength of the modificated accommodation. The calculation result proves the correctness and feasibility of this accommodation modificating method, which is of reference for similar projects in the future. Related Articles | Metrics

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The Optimal Design of Conveying Frame Based on Ansys Software WEI Xu-min, ZHANG Chuan-rong, ZHANG En-ming, GUO Hong, WU Wen-long, ZHANG Jing-ke 2018, 5 (增刊):  149-153.  Abstract ( 260 )   PDF (3161KB) ( 114 )   According to the traditional structure design, the initial solution is always provided according to the experience, including the overall layout, material selection, structure size and manufacturing process, etc. Then do the structure analysis, and check its feasible based on mechanics analysis. In such a design program, structural analysis only serves as a safe and feasible check function. Consequently, the structure will be complicated, overweight and even unreasonable, which would waste materials and increase the difficulty of fabrication. With the rapid development of finite element analysis technology, the use of numerical simulation technology for optimal design of structure can improve the distribution of design resource and the resistance of the material, saves the material consumption and make the structure more reasonable. Based on the finite element analysis software ANSYS, the conveying frame of EP18-1 topside was modeled and simulation in the construction, transportation and loadout conditions. According to the results of calculation and analysis, the structure was optimized on the premise of guaranteeing the structural and deformation, and then do the comparative analysis. Related Articles | Metrics

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Programming to Draw Cutting Model of Pipe Braces for Fixing Platform on Board XIE Hui, ZHANG Qian, DENG Meng-dong, YU Peng, HE Bin-bin, WANG Jin-song 2018, 5 (增刊):  154-158.  Abstract ( 185 )   PDF (1386KB) ( 100 )   Pipe braces for fixing platform is commonly used on board. By analyzing the characteristics of the cutting line and cutting solid, an algorithm for solve point of cutting line and solid is developed, According to the algorithm Codes are written in C# language that control AutoCAD to draw automatically. Using the program to draw the cutting model of pipe braces greatly reduce the difficulty level and improve the efficiency of shop design and prefabrication. Related Articles | Metrics

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Programming to Draw Intersecting Line of Pipe Lifting Point with Inserter XIE Hui, ZHANG Qiang, ZHANG Chuan-rong, HE Bin-bin, LIU Zhan-hang, WEI Cheng-zhi 2018, 5 (增刊):  159-163.  Abstract ( 174 )   PDF (1343KB) ( 93 )   Pipe lifting point with inserter is commonly used in lifting ocean platforms. By analyzing the characteristics of the intersecting line of sticking plate and column, an algorithm for intersecting line conversion from 3D to 2D is developed. According to the algorithm Codes are written in C# language that control AutoCAD to draw automatically. Using the program to draw the unfolded drawing greatly reduce the difficulty level and improve the efficiency of shop design. Related Articles | Metrics

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Research on the Configuration of Electric Propulsion System YU Yong-lin, ZHANG Yun, CHEN Zhi-yu, ZHANG Yuan-fei 2018, 5 (增刊):  164-168.  Abstract ( 220 )   PDF (1719KB) ( 83 )   This paper discusses the ship electric propulsion system, mainly including ：structural characteristics, configuration and control system of Marine Electric Propulsion system . Based on the research of the current electric propulsion technology, we determine the technical scheme of electric propulsion for the target ship, complete the design of single line diagram and the configuration of each subsystem and define the control requirements of the propulsion system. Related Articles | Metrics

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Optimized Design Analysis of Natural Gas Process System on the Natural Gas Platform ZHANG Yong-wei, DONG Lei, FAN Chun-lei, LI Yan-yong 2018, 5 (增刊):  169-171.  Abstract ( 224 )   PDF (934KB) ( 157 )   The process system of nature gas platform is to separate, filtrate, purify and dehydrate the nature gas explored, and make the natural gas reaches the requirements of pipeline transportation. To take full advantage of the resources on the platform and reduce energy consumption, the process system of gas platform is optimized： adding the venting system in the outlet of TEG dehydration unit, using heat energy of gas compressor to improve the dehydration effect of TEG, and adding a pipeline to connect the subsea pipeline inlet and fuel gas system inlet. This optimization can not only improve the practicability of the platform, and can save energy and reduce emission. Related Articles | Metrics

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Analysis of Sampling Rate and Ground Contact Posture of Two-Dimension Gravity Sampling Device KONG Dan-ya, MA Zhe, WANG Yin, ZHAI Gang-jun 2018, 5 (增刊):  172-176.  Abstract ( 189 )   PDF (1258KB) ( 151 )   In order to improve the sampling rate of gravity sampler, this paper simulated the free falling posture among a wide range before its grounding based on OpenFOAM and dynamic overset grid method. The accuracy and feasibility of this method have been verified by calculating free falling of a sphere and comparing the results with literature. Established two-dimensional time-domain coupled calculation model of the sampler which interacts with flow field and simulated the free falling posture with initial slant angle of 0°, 5°, 8°, analysed the relationship among falling distance, falling speed and slant angle of the sampler. In the end the influence on sampling rate made by slant angle of the sampler has been discussed. The numerical results show that the initial slant angle has a great influence on falling posture and sampling rate. All of the data and conclusion can provide measurement with guidance. Related Articles | Metrics

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A Method of ACFM Detection Based on ROV in Deepwater Condition DENG Ping 2018, 5 (增刊):  177-181.  Abstract ( 180 )   PDF (6458KB) ( 78 )   This paper introduces the demand of deepwater offshore oil facility for ACFM detection technology, the ACFM technology principle and the system, emphatically expounds several kinds of probe forms and scanning methods based on ROV for ACFM inspection, and some cases of subsea projects. Finally, the technology and scheme of ACFM detection based on ROV in deepwater condition are prospected. Related Articles | Metrics

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Application of Thickness Tolerance SHAO Wen-jing 2018, 5 (增刊):  182-185.  Abstract ( 298 )   PDF (1040KB) ( 187 )   With the development of offshore oil engineering ships, the welding technology of hull structures is diversified. In particular, the quality requirements for butt welds of unequal thickness plates of hull plates are getting higher and higher. Radiographic testing（RT）has a great change in the thickness of the unequal thickness of butt weld. If the selection of the parameters is improper, it is easy to make the radiotherapy density negatives too large, which can affect the sensitivity of RT, and can not guarantee the defects in the workpiece to be detected effectively. Thickness tolerance is an important parameter for the RT of variable cross-section workpiece. The thickness tolerance can be calculated through the function relation of exposure curve and the function relation of film characteristic curve, but it is only theoretical value. This paper mainly discusses how to measure the thickness tolerance of different tube voltages and different films under the certain conditions of exposure and focal length by experimental method and its practical application. Related Articles | Metrics

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Technology Status of Mining Guide Device of Natural Gas Hydrate in Deep Water Shallow Layer HE Xia, LI Xue-feng, WANG Guo-rong, ZHONG Lin, LIU Qing-you, ZHOU Shou-wei, LI Qing-ping, FU Qiang, WANG Lei-zhen 2018, 5 (增刊):  186-192.  Abstract ( 159 )   PDF (5274KB) ( 95 )   The new method with solid fluidization exploitation of natural gas hydrate (NGH) and the new technology with jet flow mining crushing provide new ideas for the potential commercial exploitation of non-diagenetic NGH in seabed shallow layer, and the key point in commercial exploitation is to increase the mining efficiency, and furthermore the mining device guide is the essential technology, which determine the NGH commercial exploitation efficiency. For rotary steering, soft-bodied robots and continuous mechanical arm technology, the relevant guide technology applied to applicability evaluation of NGH mining are carried out, which demonstrates the feasibility of the guide tool of continuous tube with ultra-short radius and the technology of near-bit guidance robots with hydraulic jet mining. Based on this, the scientific problems of existing guidance technology applied to the mining guidance of seabed shallow NGH are proposed, which contain the stability of formation and borehole wall, equipment dimensions restricted by well diameter, the diversion of high curvature, in-situ real-time detection, the map construction of mining regional NGH reservoir and path planning of the unexploited area. Furthermore, the future potential development directions of research on the light weight, small size, high flexibility, high strength of mining guide devices and the real-time monitoring and evaluation of NGH reservoir location are put forward. Related Articles | Metrics

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Study for the Derivation Method of Design Current  Profiles for Deepwater Structures LI Lin-bin 2018, 5 (增刊):  193-198.  Abstract ( 196 )   PDF (2474KB) ( 71 )   Response to the current is sensitive for risers and mooring systems in deepwater areas, so accurate derivation for the design current profiles is very important. This paper is based on the continuous 20 years of 1-hour current of a deepwater point in the middle South China Sea. Empirical orthogonal function and inverse first order reliability method are used to demonstrate the processes of derivation of extreme as well as fatigue design current profiles for deepwater structures. Comparison studies with the traditional and simplified methods are carried out to show the advantages of the proposed methods, which are expected to improve the engineering accuracy in real projects. Related Articles | Metrics

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Research on Key Technologies of Four Component Deepwater Oil and Gas Seismic Survey Towrope Acquisition System XU Jin-shi, QIU Bei-bei, WU Di 2018, 5 (增刊):  199-203.  Abstract ( 149 )   PDF (1854KB) ( 185 )   Marine towed cable seismic technology is the main means of deep sea oil and gas exploration. With the increasingly complex types of deep water oil and gas reservoirs, the data obtained by conventional operation methods have become more and more difficult to meet the requirements of fine offshore exploration. The four component deep water oil and gas seismic exploration towing cable system realizes vector measurement and broadband acquisition through multi-component sensing acquisition technology, and uses transverse component to reconstruct data, and improves the imaging quality of thin layer and special lithology, and improves the depth of detection. The four component cable acquisition system arranges a pressure geophone and a three component MEMS digital geophone at the same time in the towing cable. It records 3 orthogonal acceleration wave field gradient components while recording the vertical component pressure field, and compares the conventional towing system with a single type of water inspection. The collection of data is quadrupled and the acquisition system is used. Higher requirements are put forward in all aspects. In this paper, the key technologies such as synchronous acquisition, data processing, data transmission and so on for the four component deepwater oil and gas seismic exploration haulage acquisition system are studied. Related Articles | Metrics

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Research on Temperature Distribution Calculation Model for Two-Phase Flow in Deepwater Wellbore TANG Yi-jia, MA Tian-shou, HE Yu-fa, CHEN Ping 2018, 5 (增刊):  204-208.  Abstract ( 196 )   PDF (1552KB) ( 91 )   Gas-liquid two phase flow widely exists in deep-water oil and gas production process. As the structural limitation of subsea wellhead, only the wellhead temperature of tubing fluid and annular fluid can be measured. In this paper, considering the heat transfer mechanism of gas-liquid two phase flow in the production process,the temperature distribution model of deep-water wellbore two phase flow is established by semi-steady state method based on the mass, momentum and energy conservation equations. The results show that the temperature of the tubing fluid and the annular fluid decreases with decreasing of the depth for the well, and the outer annulus temperature changes, and the wellhead temperature of the tubing decreases with increasing of the apparent velocity of the gas in the tube and increases with increasing of the apparent velocity of the liquid. The lower ratio of the gas and liquid velocity, the higher wellhead temperature of the tubing fluid, and the higher ratio of the gas and liquid velocity, the lower the wellhead temperature of the tubing fluid. Annular temperature decreases with the increasing the velocity ratio of gas and liquid. Related Articles | Metrics

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Research on Pressure Compensator Used for Deep-Sea Hydraulic System HU Hao-long, LONG Lei, SHEN Xue, ZHANG Wan-liang 2018, 5 (增刊):  209-213.  Abstract ( 390 )   PDF (3644KB) ( 477 )   Underwater hydraulic technology is widely used in deep-sea exploration and resource exploitation. In order to eliminate the influence of seawater pressure on the hydraulic system, improve the efficiency of the system, pressure compensation technology is commonly used in hydraulic systems. As a key element of pressure compensation technology, the pressure compensator has been designed on the basis of experiences. In this paper, the software AMESim is used to simulate the underwater hydraulic system and it is obtained that the influence of structural parameters of compensator and hydraulic system parameters on hydraulic system. While the preloading pressure is the same, the greater the spring stiffness of the compensator, the faster the pressure of the compensator decreases, and the smaller the differential between the pressure of the tank and the environment pressure. The larger the inner diameter of the compensator, the smaller the peak of system pressure fluctuation. Due to the load, the pressure on both sides of the cylinder is likely to be lower than that of the environment pressure, and the water enters the cylinder. Adding the throttle valve at both sides of the cylinder to control the speed of it can significantly increase the pressure on both sides of it, and improve the sealing reliability of the system. Related Articles | Metrics

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Design and Application of the Bottom Current Observation System in the Deep Sea YAN Qing-xun, YU Yang, ZHU You-sheng 2018, 5 (增刊):  214-219.  Abstract ( 177 )   PDF (5362KB) ( 106 )   In order to get the high-quality observation data of the bottom current for the development and design of marine oil and gas, this paper provides a design of bottom current observation system which is suitable for the deep sea. This system has been applied in the Lingshui and Songtao sea area in the northern South China Sea for 100 days and 5 days, respectively; and these applications provide precious basis data for the subsequent development of oil and gas. During the two observation periods, the maximal bottom currents are 25.84cm/s and 16.70cm/s, respectively; and the inclinations of the bottom current meter are 3.39° and 1.72°, respectively, which are much less than the design value and insure the high quality of bottom current. Related Articles | Metrics

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Overview of Offshore Floating Wind Turbines WANG Bin, LI Hong-tao, TANG Guang-yin 2018, 5 (增刊):  220-225.  Abstract ( 163 )   PDF (1539KB) ( 189 )   This paper introduces the development trend of wind energy utilization in recent years, compares the advantages of offshore wind energy relative to onshore wind energy, and proposes that the deep sea floating wind turbine is an inevitable trend of technological development and objective conditions. The main structure types of offshore floating wind turbines are summarized. The coupled numerical model of floating wind turbines is introduced in detail, including the aerodynamic load model of the wind turbines and the hydrodynamic loads models of the support structure. Finally, the design standards and guidelines of floating wind turbines are introduced. Related Articles | Metrics

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Study on the Fatigue Analysis for Polyester Taut  Mooring System in Deep Water LIANG Yuan-hua, WEI Si-jun, SUN Zheng-ce, YANG Qing-xia 2018, 5 (增刊):  226-233.  Abstract ( 334 )   PDF (2700KB) ( 127 )   In this paper, motions of a semi-submersible floating production unit and tension response of polyester taut mooring system are analyzed in dynamic time domain method. The statistical analysis is conducted on the data of platform and mooring system including motion and tension responses. Mooring line fatigue damage is calculated by using Combined Spectrum with Dual Narrow-Banded Correction Factor Method. Drag force and added inertia force of mooring line are calculated based on Morison equation. Sensitivity analysis on drag force coefficient, added inertia force coefficient and polyester EA are conducted to study their influence in mooring line fatigue damage calculation. The results show that the fatigue damage results calculated by dynamic time domain method are more serious than frequency domain method and static time domain; drag force coefficient and EA of mooring line have an appreciable effect on mooring line fatigue damage, while added inertia force coefficient has little effect on mooring line fatigue damage. Related Articles | Metrics

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An Experimental Study of Wave Impact Loads on a Drilling Semi-Submersible Platform LIU Jian-cheng, GUO Ying-hao, XIAO Long-fei, TENG Xiao-qing, WANG Jin-guang, XU Li-xin, LU Hai-dong 2018, 5 (增刊):  234-237.  Abstract ( 296 )   PDF (2667KB) ( 204 )   Offshore platforms operating in harsh environments often suffer from severe wave impact loads which threaten the structural integrity and staff's safety. In this paper, wave impact loads on a semi-submersible drilling platform are studied experimentally. Measurement units were designed specially to monitor wave impact loads. According to the experimental datum, sensitivity of wave impact loads with respect to wave headings and the spatial distributions of wave impact loads were systematically analyzed. The results show that the platform under the beam seas and head seas is exposed to more serious wave impacts than oblique seas. Wave impact loads mainly concentrate on some area above the waterline and show obvious three-dimensional effect. Related Articles | Metrics

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New IGC Code saddle model simulations of Type C LNG/LPG carrier LOU Ben-qiang 2018, 5 (增刊):  238-243.  Abstract ( 205 )   PDF (3415KB) ( 243 )   Based on the updated requirements of “International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk”, the article discussed the saddle structure strength analysis between independent type-C liquid tank and hull construction using nonlinear contract technology. Investigations have been carried out from the references and FE model of a typical liquefied gas carrier, using MSC.Patran/Nastran software. Considering three loading conditions of static full loaded sagging, dynamic rolling and pitching, coupling with the ship motion and cargo tank. Accuracy and efficiency has been assessed between the results of temp rod and linear gap element methods; it has been observed the reliability and practicability of linear gap element application. Combined with the shipbuilding experiences and the numerical results, it was also found it is necessary considering the friction influences during the FE analysis. The paper has proposed an effective approach for carrier saddle strength analysis of type C LNG/LPG. Related Articles | Metrics

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Study on the Strengthen Method of Stability of Long Cabin Stiffened-Cylindrical Shell RUAN Jun-jie, XU Wei-jun, CHEN Tian-yi 2018, 5 (增刊):  244-247.  Abstract ( 174 )   PDF (1031KB) ( 275 )   This paper is to discuss the strengthen methods which can effectively increase the critical pressure of instability with the unusual features and usual features of ring-stiffened cylindrical shells. For the structure with usual features, non-uniform stiffeners are used to increase the critical pressure for instability. Furthermore，the theoretical method and finite element method are applied to analyze the critical buckling pressure of a submarine cabin. The comparison results showed that the strength method of non-uniform stiffeners can effectively improve the critical pressure of ring-stiffened cylindrical shells, while the combine strength method with longitudinal and circumferential stiffeners was validated to effectively increase the stability of a ring-stiffened cylindrical shell with unusual features. Related Articles | Metrics

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Inspection of Austenitic Stainless Steel Weld Using Ultrasonic-Phase Array LIU Gui-ji, GAN Zhi-yun, LI Jiang, WANG Xu, ZHANG Hong-fei 2018, 5 (增刊):  248-252.  Abstract ( 194 )   PDF (3988KB) ( 209 )   Austenitic stainless steel is widely used in deep water topsides, inspection of austenitic stainless steel weld is always a difficulty for ultrasonic method, as the development of phase array (hereafter named PAUT), the situation was highly improved due to the advantages of PAUT. And based on these advantages, this paper analysis the possible testing plan, and three blocks with artificial flaws are made and successfully demonstrate the effective of the test plan. Finally it summary some different between inspection of austenitic stainless steel weld and carbon steel welds, and also the matters need attention during the inspection process. Related Articles | Metrics

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Stability Parameters Analysis of Conversion of  Old Semi-Submersible Platform YANG Xu, CHEN Guo-long, DOU Hong-bo, DONG De-long, TANG Pi-xin 2018, 5 (增刊):  253-258.  Abstract ( 170 )   PDF (2839KB) ( 101 )   Conversion of old semi-submersible platform can solve redundant drilling platforms and reduce engineering cost, is new focus of offshore engineering. This paper uses “Nanhai Ⅵ” as target platform, choses an oil field in South China Sea. The platform is converted into a production platform and stability of the platform is analyzed by MOSES software. The main parameters’ influence on stability and balance of the platform is analyzed and the results can give reference to rapid assessment of conversion of semi-submersible platform. Related Articles | Metrics

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Construction Precision Control Study for Floating Body SUN Ning 2018, 5 (增刊):  259-263.  Abstract ( 148 )   PDF (5709KB) ( 55 )   Deep offshore engineering projects such as TLP, SPAR, semi-submersible drilling platform and etc. have floating body, and require high accuracy for center of buoyancy. Construction precision control of floating body is the important measure for ensure accuracy for center of buoyancy relative to traditional jacket offshore structures. So how to control, when to control and using which tolls to control construction precision are the most critical for floating construction. This paper introduces normal control measure for construction precision control and detail describes one control principle of precision control system. Performing this precision control system can ensure the high requirement of center of buoyancy and improve efficiency and economic benefits. Related Articles | Metrics

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Method Analysis of Offshore Oil Steel Structure Jacket Construction GAO Rui-li, LU Jing, GAO Jin-yan, ZHOU Yu-chen, GUO Mei-shan, MA Si-yao 2018, 5 (增刊):  264-270.  Abstract ( 206 )   PDF (1160KB) ( 183 )   There are three tenors during the construction process of offshore oil steel structure which are high risk, high investment and high yield. For effectively and scientifically guiding the construction, the architectural technology of jacket large Marine structures construction, should fully consider about the venue, crane, transport, offshore installation of shipment and others important links. Offshore oil engineering construction has been developing rapidly in the last 30 years of reform and openness. The method of construction of offshore jacket has also been updated according to the progress of several of resources. This thesis describes different methods of construction of offshore jacket during different stages of the resources. Related Articles | Metrics

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Construction Method of Metal Mesh for Piping Personal Protection LI Chag-hua, CHENG Zhao-xin, LIU Yang 2018, 5 (增刊):  271-275.  Abstract ( 215 )   PDF (1874KB) ( 60 )   Metal mesh for personal protection is applied to pipelines with requirements of heat dissipation re, but the location of the pipeline is within the range of operators reach, so it may cause burn. Because the metal mesh has a certain distance from the pipeline surface, and cannot be directly welded on the pipeline, so the form of installation becomes a major problem. In this paper, we want to make this new technology develop and upgrade through the introduction of the construction method of personal protection for pipeline with metal mesh, which provides a new method for the design and construction of the personal safety for domestic petroleum and chemical projects. Related Articles | Metrics

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Optimization and Engineering Application of Side Lifting Technology for Large Saddle Equipment WU Song-ping, Feng Xing-sheng, Zhao Xin-lei, LIU Huan-long, YANG Zhen 2018, 5 (增刊):  276-278.  Abstract ( 131 )   PDF (3141KB) ( 94 )   The lifting of large equipment is an important part of the construction of offshore engineering projects. However, due to the tight schedule of the project and the late delivery of the equipment, a large number of side lifting operations are caused, which increases the risk and difficulty of the installation of the equipment. The base of a large horizontal vessel is generally saddle type. Because of its long size and no slippage, the side lifting of such equipment is very difficult. Therefore, it is necessary to study and optimize the side lifting technology of large saddle equipment. Taking the corrugated plate interceptor skids of the JZ9-3 project CEPD module as an example, this paper introduces the process and method of the large saddle equipment side lifting, which provides a positive guiding significance for the large saddle equipment side lifting operation of the offshore engineering project. Related Articles | Metrics

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Design and Application of Cable Racks for Offshore Oil Platform LIU Shi-cong, LI Zhen 2018, 5 (增刊):  279-281.  Abstract ( 200 )   PDF (2200KB) ( 29 )   This paper designs a tool for pulling cable on offshore oil platform. Aiming to solve the difficult of changing directions of cable rollers when pulling cable and ensure the safety of installing cable rollers, this paper designs a tool to install cable rollers based on the construction situation. The structure of this tool is designed by AutoCAD and analyzed the stress on ANSYS software. Based on the design, the tool is fabricated and used to solve some problems of pulling cables on construction situation. Related Articles | Metrics

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Application Research of Ozone Desulfurization and Denitrification Technology in Ocean Shipping SUN Kai-qiang, BA Yong-jiang, ZHANG Yi-ming 2018, 5 (增刊):  282-286.  Abstract ( 169 )   PDF (827KB) ( 228 )   In recent years, the development of ozone desulfurization and denitrification technology has been the focus of the ship industry. Based on the principle of ozone desulfurization and denitrification technology, this paper analyzes the advantages and challenges of the application of this technology on seagoing vessels in combination with the actual situation, and puts forward suggestions on safety protection. The analysis results show that compared with the technical solution of SCR+EGC, the ozone desulfurization and denitration technology has the advantages of integrated desulfurization and denitrification, more flexible equipment layout and low dependence on diesel engine operation data. However, there are problems such as large power consumption, low ozone production, and risk of washing water discharge. It is calculated that the power of the ozone desulfurization and denitration system accounts for 6.97%~15.58% of the power of the matched diesel engine. The maximum power of a single diesel generator that can be adapted is 8.49~16.4MW, and it is difficult to arrange multiple devices in parallel due to the limitation of equipment volume. Washing wastewater has a high nitrate content and it is difficult to meet existing emission standards. For safety, it is recommended that the ozone equipment be arranged in a separate room with independent ventilation. The equipment in the hazardous area is made of special anticorrosion materials, equipped with O2, O3concentration and temperature detection systems and fireproof and explosionproof equipment. Related Articles | Metrics

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Application of Mut in Weld of CRA Composite Piping GAN Zhi-yun, LIU Gui-ji, LI Jiang, DONG Chun-yuan, MA Jing 2018, 5 (增刊):  287-289.  Abstract ( 190 )   PDF (843KB) ( 118 )   The base material of CRA composite piping is carbon steel, which is overlaid by 3 mm 625 stainless steel on inner surface. The CRA composite piping is applied more and more widespread in offshore project, because of its good ability of corrosion resistant and lower cost than stainless steel. RT is normally applied to evaluate the weld quality; however, it's difficult to overcome the inspection difficulty of too big thickness. This page develop the MUT technique, to solve the disadvantage of RT, this technique can well overcome the influence of material attenuation and interface. The technique reliability is verified by the prepared serial of artificial defect block, and can provide guidance for similar inspection. Related Articles | Metrics

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Study on the Space Assembling of Module Deck LI Hong-yan, YAN Qing-bo, LIU Jin-hua 2018, 5 (增刊):  290-293.  Abstract ( 147 )   PDF (1013KB) ( 143 )   In the past few years, with the development of marine oil, the weight of the offshore oil module has been increasing gradually, and the deck is an important part of the module. As the weight of deck increases, the weight and size of single deck also increases. Because of the large weight of single slice and the ability to exceed the lifting capacity, one deck must be divided into several pieces to lifting and hoisting separately. In the process of high-altitude group alignment, the set of closing positions becomes a difficult point. This paper introduces how to divide the deck pieces and choose the location of the space assembling to converts complex nodes at the closure to simple nodes, and strengthen check is also made. Related Articles | Metrics

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Application of PDMS in Pipe Support Integrated Construction XUE Heng, HUANG Sheng-hai, LIU Zhi-qiang, TANG Jia-he 2018, 5 (增刊):  294-299.  Abstract ( 198 )   PDF (4216KB) ( 106 )   Taking the E20 deck of EP18-1 project for example, explaining how to use the PDMS software to give a pipe support integrated construction plan. Building several models and simulating the process of fabrication in the shop, transportation on SPMT and lifting on the site. Pipe supports without any clash during these process will be installed on the deck in advance. This method will contribute to increasing the efficiency of construction. Related Articles | Metrics

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Application of PDMS and Visual Basic in Pipe Material Management CHEN Fang-fang, JIANG Fa-ping, HUANG Sheng-hai, XUE Heng 2018, 5 (增刊):  300-304.  Abstract ( 166 )   PDF (942KB) ( 80 )   Material management plays an important role in project construction, and it directly affects the time-span and cost of the whole project. This article introduces a method to manage the pipe material with PDMS and Visual Basic. Through PDMS, we can custom-made the output content in excel format by using Material-list generating function. Comparison the list can help the material purchasing timely and accurately. Programming with Visual Basic to design a user-friendly human-machine interface, we can make tedious material tracking automatically and efficiency. Related Articles | Metrics

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Sink-Stability Analysis for the Underwater Walking & Swimming Robot WEI Wei, WANG Xin-liang, TANG Ping-peng, CHEN Hong 2018, 5 (增刊):  305-308.  Abstract ( 342 )   PDF (1545KB) ( 90 )   A brief introduction to the design concept of underwater walking & swimming robot is provided in this paper. And based on the computational fluid dynamics (CFD) method, a hydrodynamic numerical simulation model for the robot body is established. Then the flow field under different body inclination conditions and different ocean currents is numerically simulated by ANSYS Fluent, and the curves of resistance, lift and pitching moment with inclination are obtained. At the same time, the stability analysis method for underwater walking &swimming robot is established by combining dynamic stability margin method (DSM), and the stability of the walking &swimming robot is analyzed. The stability of the tilting activity threshold is obtained under different inflow environments. Related Articles | Metrics

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Application of VR in Underwater Robot LIANG Yue 2018, 5 (增刊):  309-312.  Abstract ( 147 )   PDF (879KB) ( 162 )   In recent years, researchers have put more and more attention on VR and underwater robots play important role in oil exploration. This paper concludes three most common applications of VR in underwater robot, which are virtual training, VR-based telerobotics system and virtual prototype, this paper concludes the working principle and their advantages. At the same time, this paper discusses the development of these three applications and their future tendency. Related Articles | Metrics

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An Approximate Programming Method on Solving the Minimum Distance Between Intersecting Lines on Offshore Jacket DENG Kai, GUO Hong 2018, 5 (增刊):  313-316.  Abstract ( 152 )   PDF (1243KB) ( 68 )   The minimum distance between intersecting lines which are produced by intersected braces and chord has a great influence on welding quality and reliability for offshore jacket. An AutoCad LISP based a program to give an approximate result is developed to calculate and display this distance in order to replace complicated mathematical analysis and unstable manual visual inspects. The result of this program meets the demands of fabrication accuracy requirement and the program is faster, steadier than other methods and also easy to use, which facilitate the 3D modeling and engineering a lot. Related Articles | Metrics