Development of VOCs Treatment Technology for Ship Coating

 

ZHU Wenjian¹, LIU Jianfeng², HU Xiaocai², YANG Zhen², CHEN Haifeng³, YUAN Aihua³

(1. School of Metallurgical and Materials Engineering, Jiangsu University of Science and Technology,

Zhangjiagang 215600, China; 2. Shanghai Waigaoqiao Shipbuilding Co., Ltd., Shanghai 200120, China;

3. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology,

Zhenjiang 212003, China）

 

Abstract: Ship coating is one of the major pollution sources in the shipbuilding industry and the main cause of energy consumption, water consumption and Volatile Organic Compounds (VOCs) emission. This paper expounds the emission of VOCs with low concentration and large air volume in the process of ship coating, analyzes the current situation of VOCs emission reduction at home and abroad, points out the problems in the process of coating, such as the use of solvent based coating, the difficulty unorganized emission control, and the immature VOCs treatment technology, and then puts forward that VOCs emission reduction should be carried out from three aspects: source prevention, process control and terminal treatment.

Key words:ship coating; volatile organic compounds; treatment technology

 

 

 

Lashing Bridge Vibration Characteristics of

a Large Container Vessel

 

SUN Fangsheng, WANG Jiaying

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

 

Abstract: Finite element method is used to study the lashing bridge vibration characteristics of a 13500TEU container vessel. The natural frequency and structural vibration responses of the lashing bridge are assessed according to the Procedure for the Assessment of Container Ship Lashing Bridge Structures issued by Lloyd’s Register. The lashing bridge vibration analysis model for entire ship is established to study the typical vibration mode and natural frequency characteristics of the super large container vessel, and the components of excitation forces corresponding to the forced vibration responses of the lashing bridge at different locations are discovered. The model extent, boundary condition, assessment criteria and excitation sources in the guidelines are analyzed in detail, and some suggestions for shipyard are proposed.

Key words:container vessel; lashing bridge; vibration mode; forced vibration; Lloyd’s Register procedure

 

 

 

Study on the Side Thruster Performance of

Immersed Tubes Transport-installation Vessel

 

CUI Lixin, CAO Xue, HUANG Yanwen, ZHU Yunlong

（Shanghai Zhenhua Heavy Industries Co., Ltd., Shanghai 200125, China）

 

Abstract: When a self-propelled tube transport and laying vessel carries immersed tubes in a floating state, the immersed tubes are fixed between the two demi-hulls with a small clearance. In such case, if the side thruster pushes water inward, its thrust would be seriously deteriorated or even lost totally, due to the influence of the tube walls. To solve the problem, CFD (Computational Fluid Dynamics) software is used to establish a 3D model and to perform the simulations, and thus the influences of the vessel and the immersed tube on the side thruster under various working conditions are studied. Then a new arrangement for side thruster is discussed combining numerical simulation results with experimental data, which provides design reference for subsequent self-propelled tube transport and laying vessels.

Key words:side thrusters; catamaran; immersed tube; Computational Fluid Dynamics (CFD)

 

 

 

Fatigue Life Calculation of Surface Cracks at the Longitudinal Stiffener End Joints of an LNG Vessel

 

RUAN Hongbao, HUANG Xiaoping

（Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,

Shanghai Jiao Tong University, Shanghai 200240, China）

 

Abstract: This paper forecasts the fatigue life of the longitudinal stiffener end joins of liquid tanks based on the fracture propagation method of fracture mechanics. A series of computations on the stress intensity factors of surface cracks at the longitudinal stiffener end joints of a liquid tank carried out with the finite element software and the empirical formula of BS7910 leads to a new empirical formula for the correction coefficients of weld toe stress intensity factors. The results from the formula agree well with those obtained by the finite element calculations, which can be applied to the calculation of crack propagation stress intensity factors of similar end joint structures. The combinations of hot spot principal stress amplitudes are chosen according to DNV (Det Norske Veritas) regulations, and the load spectrum of the hot spot in the tank is constructed by arranging the load segments in descending order. The crack propagation fatigue life of the weld toe at the longitudinal stiffener end joints in the liquid tank is predicted using the empirical formula proposed in this paper, and the obtained fatigue life can meet the requirement.

Key words:longitudinal stiffener end joint of liquid tank; surface crack; stress intensity factor; crack propagation; fatigue life

 

 

 

Numerical Investigation of Pitching Foil’s

Propulsive Performance with Wall Effect

 

LI Yongcheng, WANG Jian, CHEN Jijun

（China Ship Scientific Research Centre, Wuxi 214082, China)

 

Abstract: A numerical investigation on the propulsive performance of a pitching foil with wall effect is performed in this study by using overlapping grid method. The systematic analysis upon the pitching foil’s propulsive performance under different wall distances, pitching amplitudes and non-dimensional frequencies f* are carried out. The numerical results show that the pitching foil’s propulsive force is increased with the decrease of wall distance, and the optimum wall distance leads to the highest propulsive efficiency. Moreover, the vortex structures behind the pitching foil under various wall distances are analyzed, providing explanation for the obtained numerical results from the perspective of flow mechanism.

Key words:pitching foil; overlapping grid technology; wall effect; numerical investigation

 

 

 

Application of Descending Device for Evacuation from

Offshore Platform

 

TIAN Feng, GONG Xue, ZHANG Jiaping, ZHANG Hongjuan, LI Yuan

（Offshore Oil Engineering Co., Ltd., CNOOC, Tianjin 300451, China)

 

Abstract: This paper introduces the domestic state-of-the-art methods for evacuation from offshore platforms, analyzes the feasibility of using descending devices under emergencies, and discusses the general principles and methods for the design of descending devices, which provides a new concept and a new method for offshore platform design.

Key words:descending device; offshore platform; evacuation; rope ladder

 

 

 

Testing and Analysis of Vibration for the Rotating Machinery

in Marine Engine Room

 

HU Yihuai¹, JIANG Jiawei¹, FANG Yunhu², ZHANG Chen², Rui Xiaosong²

（1. Shanghai Maritime University, Shanghai 201306, China;

2. AVIC Dingheng Shipbuilding Co., Ltd., Jiangdu 225217, China）

 

Abstract: This study carries out surface vibration testing for the major rotating machinery and equipment in the marine engine room (including oil separators, pumps, turbocharger bearings and intermediate bearings), and introduces the composition of the testing system and the distribution of the vibration measurement locations. The time domain and frequency domain vibration signals are analyzed. The result proves that these typical marine rotating machineries have the same vibration characteristics as those on land, and their frequency spectrum has the characteristics of integral times of the basic frequency. This study provides a method for the condition monitoring and fault diagnosis of marine equipment.

Key words:marine equipment; rotating machinery; vibration analysis; condition monitoring

 

 

 

Analysis of Load Variation Coefficients

in the Speed Correction Method

 

YANG Bin¹, YANG Min¹, LIU Gang², WU Siying²

（1. Jiangsu University of Science and Technology, Zhenjiang 212003, China;

2. Shanghai Waigaoqiao Shipbuilding Co., Ltd., Shanghai 200135, China)

 

Abstract: Based on the principles of self-propulsion model test and load variation test, this study carries out an analysis on the load variation test and its coefficient in depth with consideration of the role that the load variation coefficient plays in the ISO 15016—2015 speed correction method specified by the International Organization for Standardization (ISO), and introduces the data reference and calculation method. A 400000t ore carrier is taken as the example to calculate the load variation test coefficient. Then the calculation result is compared with that provided in the tank experiment report to discuss the validity of the proposed calculation method.

Key words:speed correction method; self-propulsion test; load variation test; load variation test coefficient

 

 

 

Application of 3D Laser Scanning Technology in Hull Construction

 

LI Cunjun, ZHANG Ying, WANG Hairong, LI Liang, HAO Huadong, SHI Haolei

（Zhoushan Institute of Calibration and Testing for Quality and Technical Supervision, Zhoushan 316021, China)

 

Abstract: Through the comparison of the measurement data from the 3D laser scanner system with that from the total station system, it is validated that the measurement accuracy of the 3D laser scanner system can meet the hull construction requirement. The measurement by the 3D laser scanner system during hull section construction and block assembly shows a much higher efficiency than that of the total station system. Therefore, 3D laser scanner system is of great promotion significance and application value in hull construction accuracy control.

Key words:3D Laser scanning; hull construction; accuracy control

 

 

 

Hardness Analysis of the Welded Joints of

Marine Pressure Vessels Based on Matrix Method

 

CHEN Jinghua, HUANG Daopei, WANG Hairong, GAN Jingtao

（Zhoushan Institute of Calibration and Testing for Qualitative and Technical Supervision, Zhoushan 316022, China)

 

Abstract: The matrix method is used to test the Vickers hardness of the multi-bead welded joint of 40mm-thick steel for Q345R marine pressure vessel. This method covers all the hardness test points in the marking method frequently used at home and abroad. According to the hardness value nephogram obtained from the test, the matrix method can make up for the limitations of the marking method caused by inadequate test points, and can clearly reflect the hardness values of the entire welded joint, which provides reference for better understanding of the mechanical properties and the improvement of the welding process. Moreover, microstructure analysis of the regions with different hardness values shows that the hardness is related to the microstructure, which indirectly reflects the microscopic influence of the welding process on the material. Through analyzing the points with typical hardness values, it founds that the welding quality can be improved by heat treatment on the welded surface.

Key words:welded joint; Vickers hardness; microstructure; matrix method

 

 

 

Research on the Anti-External-Pressure Property of

Glass Fiber Reinforced Flexible Pipe

 

LIU Chang¹, ZHANG Zongzheng², LI Chunfang³, LIN Shanying², BAI Yong^1,2

（1. Shenzhen Marine Oil and Gas Drilling Equipment and Cable Engineering Laboratory,

Southern University of Science and Technology, Shenzhen 518000, China；

2. Shenzhen OPR. Co., Ltd., Shenzhen 518000, China；

3. Beijing Digital Easy Technology Development Co., Ltd., Beijing 100010, China）

 

Abstract: Mechanical properties of the glass fiber reinforced flexible pipe under external pressure are studied. A model under external pressure is established using ABAQUS finite element software, where the maximum external pressures on the pipe are measured to verify whether the numerical analysis method is correct. During the external pressure test, the maximum external pressure values obtained through numerical analysis and through experiment are compared. It is found that maximum external pressure values from numerical analysis agree very well with those from experiment, which indicate that the theoretical formula proposed in this paper can be used to calculate the maximum external pressure of the glass fiber reinforced pipe, and to guide engineering practice.

Key words:glass fiber reinforced flexible pipe; external pressure; numerical analysis; finite element analysis

 

 

 

Management and Application of Ship Design Man-Hour

Based on SPDM System

 

FU Cheng, QIU Xiaojing, QIN Xiaoting

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

 

Abstract: Design man-hour management is an important part of ship design management, and the research on design man-hour management is of high significance in realizing delicacy management of ship design, increasing design efficiency, saving design cost and carrying out the design load analysis. This paper analyzes the main contents and method of ship design man-hour management based on the actual situation of a shipyard, and establishes a complete ship design man-hour management system. Thus the information management is achieved on this basis. Real ship application shows that the system can realize meticulous design work dispatching and data analysis, which provides the data basis for ship design man-hour management. When the system is improved and practiced constantly, the goal for the efficiency of ship design man-hour management will be reached.

Key words:design man-hour management; information management; design management

 

 

 

Navigation Safety Analysis of Integrated Bridge System

Based on FMEA Method

 

DONG Xiang

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

 

Abstract: Taking a type of ship as an example, this paper introduces the basic method and analysis procedures of FMEA (Failure Mode and Effect Analysis) method which is used in the navigation safety analysis of the IBS (Integrated Bridge System) to validate the IBS navigation safety of the type of ship. It could provide reference for the IBS design of similar ships in the future.

Key words:Failure Mode and Effect Analysis; Integrated Bridge System; navigation safety