Thermal Analysis of Type C Independent Tank

 

SHI Yumei¹, SHEN Juhua², ZOU Dangping², QIN Tianyi¹

（1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

2. Cryolobe Gas Technology Co., Ltd., Shanghai 200441, China）

 

Abstract: An analysis is carried out to make clear the heat leakage of No.1 liquid cargo tank (with a volume of 9416 m³) in the 32000m³ type C independent tank, which includes thermal analysis of the tank cylinder, end socket, fixed end saddle, sliding end saddle, anti-floating devices, air chamber and the pipelines. Calculation shows that the heat leaked is 44.24kW, the liquid cargo evaporation is 8025.7kg/d, and the static evaporation rate is 0.15%/d. Among the leakages, the tank body accounts for 75.1%, the saddles and the irregular insulation layers at both sides account for 19.4%, while the leakage from the rest components are not much.

Key words:type C independent tank; heat leakage; evaporation rate

 

 

 

Large LNG Carrier Mooring Safety Evaluation

 

LI Yongfu, LIANG Shengying, JIAO Shanshan, YANG Ruiling

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

 

Abstract: As large LNG (Liquefied Natural Gas) carriers may suffer from heavy storms when moored at open costal or riverside quays, it is necessary to carry out mooring safety evaluations case by case to keep ship in the safe mode. This article analyzes the advantages and disadvantages of the major mooring force calculation methods and their applicable conditions. The OCIMF (Oil Companies International Marine Forum) regulation of Mooring Equipment Guidelines is introduced with emphasis and the calculation results are compared with the data from wind tunnel experiment, which show that the recommended calculation method is conservative and reliable. The mooring line forces are checked in considering other factors affecting the mooring safety, and a safe and feasible mooring solution is accomplished to improve mooring safety of the LNG carrier under harsh weather conditions.

Key words:LNG carrier; mooring force analysis; mooring safety

 

 

 

Determination of Minimum Propulsion Power by

Experiment and Comparison with Baseline Method

 

DING Jinglei, WU Siying, GAN Shuilai

（Shanghai Waigaoqiao Shipbuilding Co., Ltd., Shanghai 200137, China)

 

Abstract: After the Energy Efficiency Design Index (EEDI) entered into force, the International Maritime Organization (IMO) approved the “Interim Guidelines for Determining Minimum Propulsion Power to Maintain the Maneuverability of Ships in Adverse Conditions (2013)” to avoid the danger of ship losing maneuverability in harsh environmental conditions due to insufficient engine power. This paper takes a real ship as an example to evaluate the minimum propulsion power according to the guidelines, where the emphasis is laid on the application of simplified evaluation method of the minimum ship propulsion power based on wave added resistance test results. Then the verification process is specified, the results of the simplified method are compared with those of the baseline method, and the reason behind the differences is analyzed.

Key words:Energy Efficiency Design Index (EEDI); minimum propulsion power; wave added resistance

 

 

 

Study on the Calculation Method of Pressure Inside Independent Cargo Tank of Liquefied Gas Carrier and Its Application

 

WANG Liang, XIAO Lei, CHEN Xi

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

 

Abstract: This paper proposes a parametric solution in comply with the requirement of using ellipsoid method for the calculation of pressure inside the independent cargo tanks of liquefied gas carriers specified in the newly updated International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code). Based on this, the internal pressure calculation methods, i.e. the analytic method and the discrete method, for two types of liquid cargo tank are studied. After the two methods are compared, the discrete method is selected for the code programming of the internal pressure calculation and applied to a real project, which shows a satisfactory feasibility and efficiency. It is of great significance in practical application.

Key words:liquefied gas carrier; internal pressure; acceleration ellipsoid

 

 

 

Dynamic Load Analysis of the Hinge

 at the Vehicle Ramp End of a Large PCTC

 

HUANG Chen¹, YU Long²

（1. TTS Hua Hai Ships Equipment Co., Ltd., Shanghai 200093, China；

2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China）

 

Abstract: The traditional way to check the strength of vehicle ramp hinge normally simplifies the vehicle loads to static forces and neglects the dynamic loads, but it no longer meet the design requirement of Ro-Ro ships. Therefore, this study establishes a dynamic model of vehicles running on the ramp of a Pure Car and Truck Carrier (PCTC) with the multi-body dynamics simulation software MSC·ADAMS. The critical end hinges are taken as the research object to obtain the load spectra under various vehicle loads. Then the spectra are compared with the static load results calculated by MSC·PATRAN/NASTRAN and the result shows that the dynamic load exceeds the static analysis threshold. This means that the dynamic load analysis method proposed in this paper provides useful reference for the design of vehicle ramps.

Key words:end hinge; dynamics simulation; strength analysis

 

 

 

Application of Multistage Ejectors

for the Energy Saving of Marine Cold Storage

 

JI Wei^1,2, YU Mengqi², DONG Jingming², YANG Zongqiao², GAO Jiaming²

（1. Zhejiang Fuxing Marine Shipping Co., Ltd., Hangzhou 310000, China;

2. Marine Engineering College, Dalian Maritime University, Danlian 116026, China）

 

Abstract: Based on the existing refrigeration system of the marine cold storage, a refrigeration system with ejector is designed to replace the high and medium temperature refrigerator with evaporating pressure regulating valve (back-pressure valve), which can increase the suction pressure of the compressor to reduce power consumption and realize energy saving. This paper studies the influence that the two different kinds of ejectors exert on the system when they replace the back-pressure valves. The refrigeration Coefficients of Performance (COPs) of the two schemes are compared by using environment friendly refrigerants such as R134a, R404A, R407C, R407F, R410A and R507A. The result shows that the performance of scheme II is much better than that of scheme I, which has its COPs increased by 34.95%, 47.69%, 38.02%, 38.56%, 50.37% and 43.36% when compared with the existing system. Then the influence of the evaporation temperature on the performance of the ejector system is investigated on this basis.

Key words:marine cold storage; ejector; energy saving; theoretical study

 

 

 

Bench Test for Type I Magnesium-based Hybrid

Marine Flue Gas Desulfurization System

 

LI Xiaobo^1,2, TU Shien^1,2, ZHANG Xizhao^1,2, JIN Qiye^1,2, ZHU Xiangli^1,2, SHEN Feixiang^1,2

（1. Shanghai Marine Diesel Engine Research Institute, Shanghai 200090, China;

2. National Engineering Laboratory for Marine and Ocean Engineering Power System, Shanghai 200090, China）

 

Abstract: A study on the design and bench test is carried out for Type I magnesium-based hybrid marine flue gas desulfurization system according to the emission limit of marine sulfur oxides (SO_x) proposed by International Maritime Organization (IMO), which combines the magnesium desulfurization technology on land and the actual ship application environment. The bench test method is used to analyze the influence of key design parameters on the performance of desulfurization system. The result shows that the desulfurization efficiency can be improved by increasing a certain range of liquid-gas ratio and gas velocity or increasing the number of the spray layers, but the pressure drop of the desulfurization system will be increased. When the design parameters of both the open and closed desulfurization systems are optimized according to the experiment result, the sulfur emission is compliant to the 0.1% sulfur limit under the automatic operation mode, and the wash water discharge can meet the requirements of IMO regulations, which provides guidance for the application of the desulfurization system onboard ships.

Key words:magnesium-based hybrid desulfurization; experiment research; design parameters; system performance

 

 

 

Calculation and Correction of Measured Boil-off Rate of

Type C Liquid Tanks in an LNG Carrier

 

ZHOU Zhifeng, ZHANG Qixin, LI Hui

（Shanghai Merchant Ship Design and Research Institute, Shanghai 201203, China)

 

Abstract: Daily boil-off rate is a crucial parameter which must be considered during the construction of liquefied natural gas (LNG) carrier. The boil-off rate measured on a domestic ship is used to carry out preliminary studies on the calculation and correction methods for Type C liquid tanks of a small LNG carrier, which provides reference for the subsequent design of the applicable standards for the calculation and correction of boil-off rate of LNG carriers.

Key words:Type C liquid tank; LNG carrier; boil-off rate; correction

 

 

 

Design of Humanized Lighting System for

 New Type Manned Submersible Support Vessel

 

XIA Jun, LIU Yuan, CHEN Junjie, SUN Suyue, FU Xiaohong

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

 

Abstract: The support vessel for new type of manned submersible usually has long voyages and heavy scientific research duties. The traditional lighting system onboard considers only the illumination intensity, i.e. visibility, but ignores the comfortableness of human eyes, which may easily lead to visual fatigue and even affect significantly the task, making the vessel failed to meet the requirements of the new manned submersible. To address the issue, a humanized lighting system for the support vessel is proposed considering both the physical and psychological factors to create a more comfortable working and living environment for the crew and scientists, so as to ensure the accuracy and authenticity of the experimental data collected from the scientific working area.

Key words:new manned submersible support vessel; humanized; lighting system design

 

 

 

Research and Design of the Electrical Interface

for Saturated Diving Equipment

 

JIA Yinghui

（Bestway Marine & Energy Technology Co., Ltd.,Shanghai 201612, China）

 

Abstract: Saturation diving equipment is a specially functioned equipment installed on the saturation diving support vessel. In order to meet the special operation requirements of saturated submersible support vessel, the saturated submersible equipment and its electric interface designed by Italian company DRASS are studied and analyzed in terms of power distribution, communication, closed-circuit television and fire alarm system for the external area of saturated submersible equipment. The design method derived can provide technical support for similar saturated submersible support vessels.

Key words:saturated diving support vessel; saturated diving equipment; electric interface

 

 

 

Technological Analysis on the Application of Ship Painting Robot

 

GAO Zhengjie¹, LIU Jianfeng², SHEN Xinxin², YUAN Aihua¹

（1. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;

 2. Shanghai Waigaoqiao Shipbuilding Co., Ltd., Shanghai 200137, China)

 

Abstract: Painting is an important part of ship construction, and the application of painting robots is the trend of future development. This paper analyzes the development of ship painting robots both at home and abroad, and elaborates the technical barrier to be broken through for the application of painting robots, which include cumulative growth model of robot spraying coating, experimental analysis method for painting robots, process interface and process library design, CAD (Computer Aided Design) model conversion and path recognition, etc.

Key words:ship painting; industrial robot; application requirement; technical requirement

 

 

 

A Work Station Metronomic Production Mode for

 the Subsection Group of Intelligent Manufacturing

 

SUN Yue, JIANG Hongliang, JIANG Peng, ZHANG Libing, ZHAO Chengzhi

（Dalian Shipbuilding Industry Co., Ltd., Dalian 116000, China）

 

Abstract: The metronomic production mode of work station is one of the effective ways to realize the intelligent manufacturing in the stage of block construction. In order to fully study and demonstrate the feasibility of the work station metronomic production mode in the construction stage, a subsection group assembly line is selected for the relevant research and test. The construction technology and standard operation time of subsection group erection are standardized and solidified through a series of experiment, so the unit area output of the subsection group assembly line is effectively improved. Both the test and verification result show that the work station metronomic production mode is an important way to effectively increase the efficiency of subsection construction, but it depends on the standardized operation and on-time demand distribution, and the transformation of a single link cannot fully reflect the effect of work station metronomic production mode.

Key words:subsection group; station system metronomic production; intelligent manufacturing; lean production

 

 

 

Strategy and Tactics of the Intelligent Transformation of

Shipbuilding in China

 

WU Lixin, ZHU Jiuen

（China COSCO Shipping Co., Ltd., Shanghai 200127, China）

 

Abstract: This paper analyzes the necessities and feasibilities of promoting the intelligent transformation of shipbuilding enterprises in China, and elaborates the existing major problems concerning the development of intelligentization. On this basis, it is proposed that the enterprises should carry out reengineering on the five platforms of design, sharing, production, control and service according to their ideology, planning and standard so as to form the system of “2 (ideology & planning) + 5 (platforms)” system, build the integrated intelligent construction capability, and explore an effective way to realize the intelligent transformation of the shipbuilding enterprises.

Key words:intelligentization; transformation; ship enterprise

 

 

 

Research on the Flexible Design Method of

Complex Ship Piping Support

 

LEI Hongtao, CAI Qianya, ZHANG Xin, TANG Neng

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

 

Abstract: Inconsidering the production design modelling characteristics of ship piping support, this paper studies the design requirement, modeling method and technology realization to summarize a complete set of flexible modeling and design method for the piping support. The visual interactive design module for the flexible design of piping support is developed. Real ship validation shows that the method not only increases the intelligent level of piping support design, but also performs well for the modeling quality control of the support, which raises the design efficiency and improves the design quality.

 

Key words:piping support; flexible design; 3D-experience platform; secondary development