Design of Controllable Passive Anti-Rolling Tanks for

Offshore Support Vessels

 

TANG Wei-wei, LIU Zi-qing, CHEN Ai-guo, PAN Mao-yan

(Guangzhou Maritime College, Guangzhou 510725, China)

 

Abstract: Acontrollable passive anti-rolling tank is designed for an offshore support vessel to reduce ship motions, especially the lateral ones, and to improve passenger comfort on ship while enhancing safety. Considering the sea environments where the vessel is going to operate, U-type controllable passive anti-rolling tank is chosen as the basic model based on the principle of “double resonance”. Then the basic parameters of the anti-rolling tank are calculated according to the empirical estimation formula of natural periods, and the anti-rolling device for the light-weight offshore support vessel is designed and its performance is analyzed. The results show that the anti-rolling device achieves good anti-rolling effect.

Key words:offshore support vessel; U-type controllable passive anti-rolling tank; anti-rolling system; double resonance

 

 

 

Structural Optimization for Herringbone Structure of

Stern Anchorage Device

 

LIU Yu-chao^a,b, REN Hui-long^a,b, HU Wen-jia^a,b, LIU Jian-fei^a,b, LIU Hao^a,b, LIU Bang-wei^a,b

(a. Ship Engineering College, Harbin Engineering University, Harbin 150001, China;

b. Ship and Ocean Engineering Institute of Structural Mechanics, Harbin Engineering University, Harbin 150001, China)

 

Abstract: During the assessment for the structural strength of a ship’s stern anchor collection device, it is found that there is severe stress concentration at the back-plate slanting corner of the stern anchor collection device’s herringbone structure, and the initial design cannot meet the structural strength design requirements. Therefore, structural optimization is proposed based on the form and characteristics of the herringbone structure, and the reasonable range and size for herringbone structure optimization are given according to the design requirements on the structural weight of the stern anchor collection device. The optimized herringbone structure not only increases the required structural strength, but also well satisfies the design requirement that the increase of structural weight should not be too large.

Key words:stern anchor collection device; herringbone structure; structural strength; optimization scheme; structural weight

 

 

 

Analysis of Simplified Evacuation for a Passenger Ship

 

WANG Zhong-hua

(Shanghai Rules &Technology Center of China Classification Society, Shanghai 200135, China)

 

Abstract: In order to significantly enhance the safety of a passenger ship and to improve the design, it is necessary to carry out an analysis on the evacuation arrangement optimization at the ship design stage, which includes evacuation routes selection, arrangement of evacuation means, initial distribution of people, provision of life saving appliances and calculation of evacuation time. This paper provides a simplified evacuation analysis for a passenger ship based on the latest IMO (International Maritime Organization) Circular MSC.1/Circ.1533, which can be used as reference for ship designers and drawing approval engineers.

Key words:passenger ship; evacuation analysis; means of escape; main vertical zone

 

 

 

Analysis of Topside Fatigue for

Deep-water Jacket under Float-over Installation

 

OUYANG Xiong

(CNOOC China Limited Panyu Operating Company, Shenzhen 518067, China)

 

Abstract: High impact forces may occur during the float-over operation of deep-water jacket at sea, which will generate overstress in some key structural elements, leading to low cycle fatigue at the local nodes and producing negative effect on the service life of the jacket. This paper introduces a fatigue damage calculation method for the deep-water jacket under float-over installation, including treatment of boundary conditions; simulation of load transfer among the barge, the topside and the jacket; calculation of structural responses; estimation of node fatigue and so on. The high cycle and the low cycle fatigue are considered respectively with different S-N curves, so as to calculate the fatigue damage on the connection between the topside and the jacket leg. The weak positions shown in the calculation result are strengthened and thus to provide technical guidance and security for the float-over installation.

Key words:deep-water jacket; float-over installation; topside; structural fatigue

 

 

 

Improvement of Rudder Horn Outline

 

CHEN Yue-song

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

 

Abstract: A new polygonal outline is specially designed for rudder horn to facilitate manufacture. The outer surface of its side plate is composed of plane, arc and cylindrical surface. Compared with conventional outlines, the polygonal outline has the advantages of less manufacturing work and lower production cost. The proposed outline has no adverse effect on the rudder horn strength or hull resistance.

Key words:rudder horn; outline; workload; cost

 

 

 

General Design of 380t Rudder Blade Installation Platform

 

LI Xin, ZHOU Jiong, ZHANG Quan

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

 

Abstract: This paper introduces the design methods of general planning, hydraulic system, jacking device and electrical control system for a 380t rudder blade installation platform. The finite element analysis software PATRAN is used for structural analysis and optimization of the platform, and a set of advanced security protection mechanism is designed to prevent the potential hazard in the operation. The design and manufacturing techniques are mastered during the development of large hydraulic tooling equipment, which may contribute to the improvement of intelligent shipbuilding in China.

Key words:rudder blade installation platform; hydraulic working platform; intelligent shipbuilding; tooling equipment

 

 

 

Application of SO_x and NO_x Reduction Technologies on

Liquefied Gas Carriers

 

ZHOU Xin-yuan, ZHANG Pei-lei, WANG Kai

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

 

Abstract: This study compares the marine sulfur oxide (SO_x) and nitrogen oxide (NO_x) reduction technologies commonly used nowadays such as low sulfur oil, clean fuel, exhaust gas cleaning system, selective catalytic reduction and exhaust gas recirculation, and analyses their advantages/disadvantages as well as their influence on ship design. Liquefied gas carriers developed and constructed by Jiangnan Shipyard (Group) Co., Ltd. are taken as the example to discuss the issues regarding the application of emission reduction technologies on different types of liquefied gas carriers from the aspects of propulsion system, liquid cargo handling system and so on.

Key words:sulfur oxide; nitrogen oxide; emissions reduction; liquefied gas carrier

 

 

 

Design of the Secondary Cargo Heating System for

 33000t Chemical Tanker

 

CAO Yun

(New Century Ship Design & Research (Shanghai) Co., Ltd., Shanghai 201203, China)

 

Abstract: This paper introduces the heating characteristics of the liquid cargo tank of chemical tankers and their influence on the cargoes. The secondary heating method is compared with other heating methods, and their advantages and disadvantages are analyzed. Selection and design of the secondary heating system for a 33000t chemical tanker is discussed in detail, which provides reference for the design of similar ships.

Key words:chemical tank; stainless steel; secondary heating

 

 

 

Helideck Electrical System Design

 

WANG Ke-hu, YANG Xue-lian

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

 

Abstract: This paper explainsthe configuration and installation requirements of UK CAP437 regarding electronic systems on helideck while introducing the offshore platform helideck, where the helideck lighting system and environment monitoring system are elaborated in detail and the communication system in brief. The key points for electrical equipment installation are discussed according to the distinct requirements on the helideck’s obstacle free zone and obstacle restriction zone, which provides technical support for the installation to meet the latest CAP437 requirements.

Key words:offshore platform; helideck; lighting; environment monitoring; communication

 

 

 

Application of Laser Welding in Shipbuilding Industry

 

ZHOU Fei，ZHANG Yu-yu，SHEN Jun

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

 

Abstract: As laser welding is seldom used in the Chinese shipyards, there is little experience to go by and the welding operators are not so skilled, experimental studies are carried out to get the parameters of laser welding of thin plate, where weld seam tracking system and ADAP adaptive system are applied to make laser welding preliminarily meet the requirements of production and to provide a theoretical basis for promoting laser welding in the shipbuilding industry.

Key words:laser welding; thin plate; welding deformation; welding efficiency

 

 

 

Nondestructive Testing of Defects in Glass Fiber Reinforced Polypropylene Composite Plates for Flexible Pipes

 

ZHANG Xue-hui^1,2, QIAO Ying-jie¹, XU Hong-tao¹, LIU Rui-liang¹

(1. Key Laboratory of Superlight Material and Surface Technology of Ministry of Education,

Harbin Engineering University, Harbin 150001, China；

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

 

Abstract: This paper introduces the nondestructive testing method using glass fiber reinforced polypropylene composite material. Glass fiber reinforced polypropylene composite plates with different thermal fusion processes are prepared, and the defects in the composites, such as layering and lipid-poor and polyester defects, are characterized by ultrasonic nondestructive testing, where the porosity is measured and is used to reveal the relationship between the properties of the composite and the types and quantities of the defects. This research provides the theoretical guidance for the application of defect detection using glass fiber reinforced polypropylene composite plates.

Key words:glass fiber reinforced resin matrix composite; ultrasonic nondestructive testing; porosity; interlaminar shear properties

 

 

 

Analysis of Precise Positioning Method for

Large FPSO Module Installation

 

LIU Chuan-hui, SHI Liang, XUE Yu-hui, XU Da-cai

(Offshore Oil Engineering (Qingdao) Co., Ltd., Qingdao 266520, China)

 

Abstract: This paper proposes two guide structures for the module installation on Petrobras FPSO P67 to solve the problem of positioning precision in the installation of large Floating Production and Offloading (FPSO) modules. The two structures are analyzed in terms of convenience for mounting and disassembly, positioning precision and economical efficiency, in order to bring the more economical and useful guiding and positioning methods to the module installation. The application on the real ship shows that the optimization of the guide plate structure has no doubt improved the installation efficiency. It provides reference for the installation of similar modules.

Key words:Floating Production Storage and Offloading (FPSO); module installation; guide structure; precise positioning

 

 

 

Comparison of Tandem Lifting Measures for

Semi-Submersible Crane Vessel

 

WANG Jin-guang¹,XU Li-xin¹,HU Qi², SHOU Joe¹, HUANG Kai¹, INDRADatta¹

(1. China Merchants Offshore Technology Research Center, Haimen 226116, China;

2. OOS International B.V, Serooskerke, 4353ZG Netherland)

 

Abstract: This paper introduces the development of semi-submersible crane vessel (SSCV) in China, and summarizes the key factors affecting the double crane slewing operation. Taking the lifting and loading of spar topside modules with Zeelandia as the research object, this paper illustrates the major characteristics and detailed processes of two crane slewing measures, i.e., invariant cargo orientation and invariant boom erection angle. Their respective advantages and disadvantages are investigated and the necessity of their combination is also discussed. The solution presented in this paper is essential for the hull optimization and general arrangement improvement of Zeelandia, which may provide reference for the research of tandem lifting operations of other SSCVs.

Key words:Semi-Submersible Crane Vessel (SSCV); heavy lifting; two cranes simultaneous slewing

 

 

 

Application of 108m Piling Barge in the Piling Operation of Overweight and Overlength Steel Pipe Pile

 

JIN Ye

(CRCC Harbour & Channel Engineering Bureau Group Co., Ltd., Zhuhai 519000, China)

 

Abstract: In order to meet the increasing design requirements on the large cross-sea bridges and offshore wind farms in china, the steel pipe pile -an important component of the pile foundation -is developing towards the trend of overlength and overweight, which leads to higher requirements on the capacity and technologies of the machinery and equipment for the pile sinking operation. This paper summarizes the experience gathered in the equipment optimization and technological improvement of the 108-meter piling vessel Tiejianzhuang 01 built by CRCC Harbour & Channel Engineering Bureau Group Co., Ltd. for the piling operation of overweight and overlength steel pipe piles, and introduces the unique method for overlength and overweight steel pipe piling operation. The successful application of the method demonstrates that the ship has played an important role in large engineering construction projects.

Key words: pile driving barge; overlength and overweight steel pipe piles; piling operation of steel pipe piles

 

 

 

Synchronization and Placement of Equipment on

a 3D Experience-based Ship

 

ZOU Meng-yao, GUAN Wei-yuan, WANG Chong, WU Li

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

 

Abstract: Logical to Physical (L2P) is an important method which allows Logical Design convert to Physical 3D Design on the 3D Experience Platform. With this method, the veracity and efficiency of the equipment position synchronization in 3D Design could be improved. The synchronizing mechanism of L2P in practice is systematically elaborated from two aspects –the allocation of resource and the process of synchronization. The accurate equipment placement based on ship coordination system is realized with Enterprise Knowledge Language (EKL). All these provide specific technical route for the placement of equipment in the 3D design of machinery, electricity, outfitting and so on.

Key words:3D Experience; Logical to Physical (L2P); equipment position synchronization; equipment placement