Analysis of the Problems Existing in Technical Requirements of Oceanographic Survey Winch and Its Countermeasures

 

SANG Wei, TONG Yin

（Marine Design & Research Institute of China, Shanghai 200011,China）

 

Abstract: Oceanographic survey winch is the key equipment for marine survey operation and oceanographic research. However, there is a lack of unified technical requirements for this kind of winch that is generally understood and accepted both at home and abroad, which leads to the inconsistent technical indicators and definitions. To solve the problem, the authors studied the relevant rules, standards and technical literature in China and abroad, and puts forward suggestions on the technical indicators and test verification requirements of oceanographic survey winch based on the design experience of oceanographic research ship and the application experience of oceanographic survey winches in recent years, so as to provide reference for the design and application of oceanographic survey winches.

Key words: oceanographic survey winch; technical indicators; test requirements

 

 

 

Development Status and Consideration of

Inland Electronic Navigation Chart

 

XU Haichao, XIE Bin

（Jiangsu Key Laboratory of Intelligent Perception and Control of Integrated Transporation,

China Design Group Co., Ltd., Nanjing 210014, China）

 

Abstract: Inland electronic navigation chart (IENC) is studied to promote the intellectualization of inland waterway transportation, and to realize the autonomous navigation, the intelligent navigation support and the intelligent supervision. The existing technology for the domestic IENC of Yangtze River is elaborated in detail based on the analysis of IENC development both at home and abroad, and the difficulties in the development are summarized. Suggestions are proposed for the future development of IENC to promote the intellectualization of inland waterway transportation.

Key words: intelligent shipping; inland electronic navigation chart; electronic navigation chart of Yangtze River; intelligent navigation support

 

 

 

A Research on Ship Screw Pump Design

Based on Value Engineering

 

ZHU Zhida, TANG Shuai, ZENG Li, KOU Haijiang, ZHANG Fan

（School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China）

 

Abstract: The evaluation model and method for marine twin screw pump design are proposed according to the value engineering theory. The value analysis and comprehensive evaluation of the single-suction twin-screw pump are carried out, and the design is modified and optimized based on the evaluation result. The base point coefficient method is used to redistribute and adjust the target cost of key components, so as to achieve the optimal match between function and cost. The resulting value coefficient is close to 1,and the cost is reduced by about 34.6%.

Key words: value engineering; screw pump; design scheme; evaluation; necessary functions; life cycle cost

 

 

 

A Comparative Study on Prediction Methods of

Ship Power and Speed Loss in Waves Based on Model Test

 

LU Zehua, LI Jianpeng, LI Chuanqing

（Shanghai Ship and Shipping Research Institute, Shanghai 200135, China）

 

Abstract:In order to compare the prediction methods of ship power and speed loss in waves, a 19 000 DWT multi-purpose ship is taken as the research object to carry out the resistance test and the self-propulsion test in regular waves. Three ship power prediction methods recommended by the International Towing Tank Conference (ITTC), i.e. the torque and revolution method (QNM), the thrust and revolution method (TNM) and the resistance thrust identity method (RTIM) are adopted together with the empirical corrections on TRM and RTIM to predict the speed loss of the target ship in waves. It is found via comparing the results of prediction methods that the speed loss predicted by the three methods are basically similar at low sea conditions and all within the allowable accuracy range of the project, but the predicted results are generally larger under large wave conditions as they are affected by the linear wave hypothesis. The empirical correction of RTIM proposed in this paper considers the influence of relative rotation efficiency and appropriately reduces the prediction value to make the prediction result closer to that of QNM and TNM, which is proved rationally. This method is recommended to be used for ship speed loss prediction in practical engineering applications so as to save the test time and cost.

Key words:power increase; speed loss prediction; resistance thrust identity method; self-propulsion test in waves

 

 

 

Dynamic Response Analysis of Shallow Water Lazy-wave and

Lazy-S Dynamic Cables

 

YU Guojun, WANG Mengyi, FENG Runan, PAN Chuzhi, HUANG Ruobin, CHEN Kai

（Ningbo Orient Wires & Cables Co., Ltd., Ningbo 315000, China）

 

Abstract: Shallow water lazy-wave and lazy-S dynamic cables are taken as the research object to establish the theoretical model based on the lumped-mass method, where two kinds of design configurations are compared and analyzed by OrcaFlex, and the dynamic configuration, effective tension and maximum curvature of the cables are obtained taking into account the change of incident direction of environment loads and the large offset of vessel. The dynamic response characteristics of the two design configurations for shallow water applications are elaborated, and it is proposed that lazy-wave dynamic cable should be given more attention to the interference between dynamic cable and adjacent pipelines, as well as the bulking and bending protection near the touchdown point and anchored point, while for lazy-S dynamic cable, attention should be paid to the interference between cable and seabed, as well as the strength design of the clamp. All the conclusions can provide reference for future configuration design of shallow water dynamic cables.

Key words: dynamic cable; lazy-wave; lazy-S; dynamic response

 

 

 

Rudder Area Estimation Method Based on

Consistent Deviation with Parent Ship

 

WANG Zhigang, ZHOU Xu

（Nantong COSCO KHI Ship Engineering Co., Ltd., Nantong 226005, China）

 

Abstract:This paper compares several methods available for estimating rudder area at preliminary design stage. The result shows that the deviations are large and fluctuate fiercely with the ship types. Therefore, a rudder area estimation method based on consistent deviation with parent ship is proposed. Calculation verifies that the method can accurately estimate the rudder area, which ensures the ship to have a good maneuverability.

Key words: ship maneuverability; rudder area; parent ship; consistent deviation

 

 

 

Overview of the General Design of 200 000 m³ LNG Carrier

 

XIONG Fei, ZHOU Nan

（Shanghai Wison Offshore & Marine Co., Ltd., Shanghai 201210, China）

 

Abstract: The general performance and design characteristics of a 200 000 m³ Liquefied Natural Gas (LNG) carrier is analyzed based on the international rules and regulations, the main dimensions and parameters, the general arrangement, the speed and fuel consumption, the cargo containment system and cargo capacity, the propulsion system and the boil-off gas (BOG) management. The result shows that the new generation propulsion system and cargo containment system onboard has brought the ship with the features of low fuel consumption, low evaporation rate, environmental friendly and suitable for the major ports in the world, which provides reference for the design of same type of ships.

Key words: 200 000 m³ Liquefied Natural Gas carrier; general performance; design

 

 

 

Design of Automatic Ash Blowing Device for

Marine Waste Gas Boiler

 

YANG Jiali1, MA Sainan2

（1. Zhejiang International Maritime College, Zhoushan 316021, China；

2. Zhejiang Jialan Ocean Electronics Co., Ltd., Zhoushan 316021, China）

 

Abstract:To solve the issues caused by the blowing device of water-tube marine waste gas boiler, such as low working efficiency, complex operation procedure, large workload, poor working condition and the risk of steam hurt, this study designed a timed automatic waste blower based on the load of main engine, which realizes the timed automatic dust blowing of the marine boiler. It uses STC89C52 chip as the control core, the electromagnetic valve and step motor as the execution equipment, and the steam as the power of dust blowing. The verification result shows that the device can effectively clean the dust accumulated inside the boiler, so as to reduce the personnel workload, improve working efficiency, and avoid the occurrence of accidents.

Key words: water-tube boiler; automatic dust blowing device; STC89C52

 

 

 

A Discussion on Real Ship Application of

Cooling Water System for Dual-Fuel Generator

 

LU Shuwen, ZHAO Bing, NI Chunjie

（Hudong-Zhonghua Shipbuilding (Group) Co., Ltd., Shanghai 200129, China）

 

Abstract: This paper discusses the optimization of generator cooling water system based on a WÄRTSILÄ 34DF dual-fuel generator. The reason for the low outlet pressure of the low temperature cooling water centrifugal pump and the insufficient water flow of the high temperature cooling water are analyzed. Then the solution of installing a restriction orifice at the low temperature cooling water outlet is proposed. Its application onboard shows that the restriction orifice with suitable aperture added in the system can control the production cost and simplify the pipeline system under the premise of satisfying the equipment demand reliably.

Key words: dual-fuel generator; cooling water system; centrifugal pump; restriction orifice

 

 

 

Application of a New CIRCLE-H Helideck Lighting System

 

WANG Hongbo

（Offshore Oil Engineering Co., Ltd., Tianjin 300452, China）

 

Abstract: According to the recommendation of UK Civil Aviation Authority standard CAP 437 (2018 version), offshore platform helideck is required to install a new type of CIRCLE-H lighting system to help pilots accomplish the take-off and landing operation at night. This paper analyzes and summarizes the advantages and maintenance methods of CIRCLE-H lighting system based on both the guidelines of CAP 437 and the real application on an offshore Well Head platform to provide reference for the design and construction of subsequent offshore oil platform helidecks.

Key words: offshore platform; helideck; lighting system; night flight; black hole effect

 

 

 

Introduction of the DP System Onboard 152000 DWT Shuttle Tanker

 

LI Jingzan

（COSCO Shipping Heavy Industry (Zhoushan) Co., Ltd., Zhoushan 316131, China）

 

Abstract: The complex and changeable marine environment makes the traditional mooring positioning method for deep-water exploration hardly meet the accuracy requirement. Therefore, it needs a positioning system that is easy to operate, accurate in positioning and stable in the operation at sea. The marine dynamic positioning system mentioned here has the advantages of easy operation, high positioning accuracy and better automaticity. This paper introduces the typical application of such system on a 152 000 DWT shuttle tanker, to provide a better understanding of the application and practice of ship dynamic positioning system.

Key words: shuttle tanker; dynamic positioning; DYNPOS (AUTR)

 

 

 

A Research on the Friction and Wear Caused by KM Lubricant Anti-wear Additives on Steel-Steel Pair

 

LIN Jianhui¹, ZHANG Long¹, WANG Bingxuan¹, WEI Lidui²

（1. CNOOC Energy Technology & Services-Oil Production Services Co., Tianjin 300452, China;

2. Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China）

 

Abstract: A new KM additive is proposed to improve the comprehensive performance of lubricating oil of internal combustion engines and to prolong the service life of lubricating oil. Its lubrication performances are verified by the friction and wear tests, where KM additives is put into SL 15W-50 lubricating oil, and the contrastive tribological property tests of four-ball, rotary plate-pin and reciprocating plate-pin for steel-steel pair are carried out with UMT-Tribolab multi-function friction and wear tester. At the same time, the morphology of friction is analyzed with a 3D contourgraph and an electron microscope, and the mass loss of test pieces is measured by high precision electronic scale. The test results show that KM additive has good self-repairing ability which can effectively reduce the friction and the wear of steel-steel pairs and improve the anti-wear property of lubricating oil. The anti-wear property of the lubricating oil is much better after the additive is added.

Key words: additive; steel-steel pair; friction and wear; self-repair

 

 

 

Stress Measurement Technology for

Modular Assembly of Arrayed Pipes

 

LU Chunliang¹, LYU Lei¹, YANG Zijia²

（1. Ship Design and Research Institute, Bohai Shipyard, Huludao 125004, China;

2. Bohai Vocational College of shipping, Huludao 125004, China）

 

Abstract: The stress measurement technology for the modular assembly of arrayed pipes is studied to provide the measurement analysis tool and the theoretical basis for the calculation method of the in-field arrayed pipe assembly stress. ANASYS software is used to perform the finite element analysis of the 3D entity based on the self-developed 3D flexible platform and the stress measurement data. The result shows that the technology can realize the accurate simulation of the installation environment of the arrayed pipe units of the whole ship, which eliminates a large amount of in-field pre-assembly installation work, shortens in-field pre-assembly cycle and reduces material waste, and thus significantly improves the accuracy as the pre-assembly results are transferred to the real ship.

Key words: arrange pipes; assembly stress; measurement technology; ANSYS software

 

 

 

A BOP Installation Method for Jack-up Drilling Platforms

 

LIU Chunxu, SUN Fu, LI Hongyan, GUO Yongheng

（TZ（Tianjin）Binhai Heavy Machinery Co., Ltd., Tianjin 300452, China）

 

Abstract: This paper introduces a BOP installation method for jack-up drilling platforms. The main dimensions and structural types of BOP (Blowout Preventer) are given, and two installation schemes are put forward based on the characteristics of BOP. Their advantages and disadvantages are analyzed to choose one as the installation scheme suitable for the actual situation. Then the detailed installation procedures are worked out, and the key points of each step are stressed. The results of field installation show that the scheme chosen is feasible.

Key words: jack-up drilling platform; BOP; installation

 

 

 

A Research on Extraction and Release of

Outfitting Production Design Drawing Information

 

YAN Lilin, WANG Rui, LIU Haibin, ZHANG Baomin, WANG Kun

（Dalian Shipbuilding Industry Design and Research Institute Co., Ltd., Dalian 116005, China）

 

Abstract: This study investigates the extraction and release of outfitting production design drawing information based on the production design model. The release of outfitting pipe production drawings is taken as the example to describe the operation process of obtaining, saving and releasing design data information from model and drawings. The design platform interface and the program development language combined with SQL Server database are used to produce the solutions to deal with the technical problems of drawing information extraction, data synchronization, overall page arrangement, calculation of flange assembly pre corner and classification of assembly line identification code appeared in developing the information extraction and release system of outfitting production design drawings, which provides an effective way for the digital release of drawing information and the synchronous data transmission.

Key words: information digitization; data extraction; synchronous transfer; drawing release

 

 

 

A Research on Visualization Technology of Complex Assembly

Based on 3D Experience Platform

 

FEI Yuqing, SUN Haoyue, LI Haibo

（Jiangnan Shipyard (Group) Co., Ltd., Shanghai 201913, China）

 

Abstract: When 2D drawings combined with process documents are used as the expression of the complex ship design and construction process to guide the segmented assembly and construction, the correlation between the 2D drawing and the model is not so clear and the process expression does not cover everything it should explain. It is easy for the workers on site to misunderstand the assembly process. To solve the problem, the complex assembly flow is analyzed and the construction process specification is summarized to develop a complex process visualization technology based on 3D Experience Platform, which can effectively promote the personnel on site to understand the complex assembly process, and to reduce errors and rework in the segmented construction, so as to improve the fabricating efficiency of the segmented ship construction.

Key words: complex assembly process; 3D Experience platform; visualization