A Research on the Systematic Promotion of Green Ships

 

LIU Jianfeng, LU Junguo

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

 

Abstract: In order to pursue the national and local policies of environmental protection and to systematically promote the development of green ships, this paper analyses green ships and puts forward the concept of systematic promotion based on the life cycle of ships from design, construction, operation to disassembly, where the emphasis is placed on the solutions for the two phases of green design and green constructions from the perspective of shipbuilding enterprises. Some of the solutions have already been applied in the shipyards. The result shows that it is helpful for ships to realize scientific, economic and effective environment protection through the entire life cycle by making top level planning and carrying out the systematic studies and promotions from design and construction to operation and disassembly.

Key words:ship; green; design; construction; operations; disassembly

 

 

 

Dynamic Simulation on the Water Entry Slamming

in Subsea Production Device Lifting Operation

 

SUN Qing, ZHANG Haonan

（China Oilfield Services Limited, Geophysical, Tianjin 300451, China）

 

Abstract: In the subsea production devices lifting operation, the large-size pieces tend to suffer relatively higher slamming forces in the moment of contacting the sea surface, which may cause safety issues if the transient dynamic loads exceed the limitation of the crane and its wires. To solve the issue, this paper theoretically analyzes the hydrodynamic loads both on the lifting vessel and the subsea production devices in lifting operation, and carries out dynamic simulations of manifold entering water in time-domain with OrcaFlex software. The dynamic amplification factors of the wire and other apparatus are checked in various sea conditions to determine the safe operation window for lifting operation. Moreover, the influence of different lowering speeds on the dynamic loads is analyzed under different random wave trains. The results show that the larger the wave height, the larger the dynamic loads, while small wave slopes are beneficial for the operation. Reducing the lowering speed might increase the dynamic loads, therefore blindly reducing the lowering speed is not recommended for practical operation.

Key words:lifting operation by vessel; water entry slamming; time-domain simulation; operation window; dynamic amplification factor

 

 

 

T-Type Dual-Derrick Design for

Semi-Submersible Drilling Platform

 

XU Langjun¹, WANG Haibing¹, HAN Huawei¹, SUN Yuhai¹, ZHANG Bolun²

（1. Yantai CIMC Raffles Offshore Ltd., Yantai 264670, China;

2. Shanghai Marine Diesel Engine Research Institute, Shanghai 201108, China)

 

Abstract: Deepwater semi-submersible drilling platforms are the important equipment for the exploration of offshore oil and gas, of which the drilling package and the derrick are the major system and equipment to perform drilling functions. This paper introduces an independently designed T-type double derrick applicable to deep-water semi-submersible drilling platforms. The feasibility of the derrick design is evaluated by the overall evaluation, stability analysis and derrick layout verification. It provides reference for the engineering design and layout of deep-water drilling modules.

Key words:deep water semi-submersible drilling platform; T-type dual derrick; derrick stability analysis; derrick equipment selection; derrick equipment layout

 

 

 

Design of Ballast Transfer System for

Catamaran Engineering Ship

 

YAOTangyi, LIANG Yuxin, HUANG Qiuyun, JIANG Yonggang, PENG Xiuqing

（CSSC Guangzhou Huangpu Wenchong Shipbuilding Co., Ltd., Guangzhou 510715, China）

 

Abstract: When different types of ballast transfer methods are compared and analyzed, a ballast transfer system for a catamaran is designed taking into account the twin hull structural characteristics. This paper analyzes the structures of the ballast system, discusses the working principles of the ballast transfer system, and elaborates the design in the aspects of key design points, achieved functions and ballast control process. It provides reference for the ballast system design and optimization of similar ship types.

Key words:catamaran; ballast system design; valve remote control; ballast transfer

 

 

 

A Research on the Damage Stability of 8400 DWT

Single Cargo Hold Heavy-Lift Multi-Purpose Vessel

 

CHEN Yanxi, WANG De’an, YANG Bo

（Shanghai Merchant Ship Design and Research Institute, Shanghai 200032, China)

 

Abstract: The damage stability of the 8400 DWT single cargo hold heavy-lift multi-purpose vessel is studied on the premise that the function of the single cargo hold is ensured to satisfy the requirements of the subdivision index. The influence of the factors on the damage stability is obtained and the damage stability design is optimized by calculating and comparing the subdivision index A with different side tank quantities, side tank width, height of watertight secondary deck and height of double bottom. The reasons behind the trend of influence are analyzed based on the regulatory damage stability calculation formula to maximally reduce the limitations of GM values on damage stability, to increase cargo loading capacity, and thus to create an excellent design which takes into account both ship’s function and damage safety .

Key words:multi-purpose vessel; single cargo hold; heavy lift; probabilistic damage stability; bottom damage

 

 

 

Design Difference between Bulk Carriers without Timber

Loaded on Deck and with Timber Loaded on Deck

 

ZHANG Weifeng

（Jiangmen Nanyang Ship Engineering Co., Ltd., Jiangmen 529145, China）

 

Abstract: In compliance with the rules and regulations, this paper analyzes the design difference between 39000DWT bulk carriers without timber loaded on deck and with timber loaded on deck according to the shipyard requirements for batch production. The comparison shows that not only the lashing system can be removed from the deck without timber loaded on deck, but the bottom and side ballast tank arrangements are also quite different, which leads to different quantities of ballast tanks and different outfitting materials (from 18 for the timber on deck to 12 for the non timber on deck). The design of the non timber on deck is much easier and it has the features of more material savings, higher construction efficiency and more convenient maintenance, so the overall construction cost could be reduced correspondingly. This study provides references for the differentiated design of similar ship types to meet different function requirements.

Key words:open deck timber transport; ballast tank arrangement; design difference and optimization; production cost

 

 

 

Analysis of Fatigue Life for Assembled Underwater Ram BOP

 

CHEN Wenke, XU Lixin, ZHU Chuanyu, MIAO Chen, YUAN Yuan

（China Merchants Offshore Technology Research Center, Haimen 226100, China)

 

Abstract: At present, the fatigue life of underwater ram BOP (Blowout Preventer) structure is calculated separately without considering the influence of stress on the assembly process of BOP, which has certain limitations. Therefore, the assembly modeling of ram BOP with 103MPa wellhead pressure is carried out by using the finite element analysis software ANSYS. Based on the S-N curve of ASME rule, the fatigue life of ram BOP’s pressure structures under non proportional load is analyzed and evaluated with the Fatigue Tool module ANSYS Workbench according to the stress analysis of the assembly under rated working pressure. The results show that the pressure times of high-pressure ram BOP under rated working pressure are much more than that required by the domestic industry standard, which indicates that the fatigue life of the BOP is not a decisive factor for the pressure structure design. This means little attention needs to be paid to it in the preliminary design stage.

Key words:underwater ram BOP; finite element analysis; ANSYS software; ASME regulation; S-N curve; fatigue life

 

 

 

Engine Room Ventilation Simulation and Its Application

 

LIU Changjian, ZHANG Yiyuan

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

 

Abstract: The Computational Fluid Dynamics (CFD) is applied to the numerical simulation of engine room ventilation of a jack-up gravel laying and leveling vessel. The temperature and velocity fields of the engine room under two working conditions of main engine are analyzed based on the design simulation to verify the rationality of the ventilation design and to check if the design expectations are realized. The simulation result shows that the ventilation mode of side-in and top-out can meet the demand of heat dissipation and air circulation of the engine room. This can be widely introduced to the similar projects or to provide reference for the design of ventilation systems.

Key words:gravel laying and leveling vessel; main engine room; ventilation effect; velocity field; temperature field

 

 

 

Precision Inspection Method for Profile Steel after Forming

 

LUO Pingping, YU Feng, ZHANG Guoxin, ZHU Jun

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

 

Abstract:Manual visual inspection is still used in the process of hull parts processing to check the precision of the profile steel after forming. It has the problems of slow speed, long inspecting period and low efficiency, which impedes the rapid processing of hull parts. To solve the problem, this paper analyzes the precision inspection status of formed profile steel and proposes an intelligent inspection solution for the development of the intelligent inspection system. Some of the ship products are taken as the research object to carry out precision inspection tests for the formed profile steel of different types and different specifications. The result shows that the new measuring technology can ensure the rapid and precise inspection of the formed profile steel so as to improve the accuracy and efficiency of ship construction.

Key words:manufacturing technique; profile steel forming; intelligent inspection; precision measurement

 

 

 

Truss Structure Tooling Based on Ship Design Software SPD

 

LI Shujun, ZHANG Lei, DENG Guohui, LIU Yuanchun

（CSSC Huangpu Wenchong Shipbuilding Co., Ltd., Guangzhou 511462, China）

 

Abstract: Taking the construction and installation of the stern pipe laying system and the A-frame pipe truss of a pipe laying crane vessel as the research object, this study adopts the truss structure module of the SPD software to accomplish an accurate modeling, so as to transform the immeasurable spatial surface coordinates into measurable plane coordinates and develop a tooling scheme for the rapid positioning, installation and inspection of steel pipe truss structures, which has greatly improved the efficiency and qualified rate of truss structures to reduce material waste and the workload. The study provides guidance for the future construction of truss structure products.

Key words:truss structure; structure modeling; tooling design; construction efficiency; qualified rate

 

 

 

Design Solution for Automated Marine Pipe Manufacturing

 

GONG Jiandong, SONG Wei

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

 

Abstract: In order to improve the automation level of pipe manufacturing in domestic shipyards, the situation of pipe manufacturing in the major shipyards both at home and abroad is investigated. The result shows that domestic pipe manufacturing has met the needs of shipbuilding, but there is a bottleneck in raising the efficiency and quality of pipe manufacturing. At the moment, the extensive production mode is still used in the domestic pipe manufacturing, which is not in line with the development direction of automated pipe manufacturing. This paper points out that the backward design method and technology is the main reason that disables the assembly line operation and the automated operation on site. Therefore, the big data of multiple ship pipe manufacturing is utilized to analyze the characteristics and percentages of the pipe types so as to optimize the traditional pipe group categorization. Meanwhile, the concept of intermediate product is introduced to prefabricate the branch pipes. All the design data can be collected by the program and feedback to the construction site, which provides theoretical data for realizing the assembly line and automated pipe manufacturing.

Key words:big data; assembly line; pipe group; intermediate products

 

 

 

Failure Mechanism of Nylon-1313

Reinforced Chloroprene Rubber Composites

 

TIAN Fei¹, LI Shiyun¹, QIAO Yahui²

（1. Faculty of Mechanical and Electrical Engineering,

KunmingUniversity of Science and Technology, Kunming 650500, China;

2. Tianjin Institute of Shipbuilding Technology, Tianjin 300450, China）

 

Abstract: In order to predict the effect of static longitudinal stretching load on nylon-1313 enhanced neoprene composite materials, and to provide data support for the failure mechanism and mechanical properties of the material, the stretch failure mechanism and mechanical properties of the composite material are analyzed by static longitudinal stretching test on the MTS machine with the test samples made of the composite material of different thickness. The results show that the composite specimens with different thickness have undergone three stages including elastic deformation, nylon cloth debonding and fracture, and matrix fracture failure. The tensile failure strength of the specimen increases along with the increase of the thickness of composite material, but the bond strength between nylon cloth and chloroprene rubber becomes a factor that cannot be ignored when the thickness exceeds 5.0mm, and the failure stress will drop sharply while big fluctuations of the elastic modulus and the maximum displacement do not appear in the elastic deformation stage, which tend to be stable.

Key words:chloroprene rubber; nylon -1313; tensile test; failure mechanism; mechanical property

 

 

 

Establishment of Lean Management System for

the Supply Chain of Shipbuilding

 

WU Yongjun, CHU Niansheng, LI Kunlin

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

 

Abstract: This paper systematically analyzes the characteristics of shipbuilding and its supply chain management with the starting point on the basic concepts. On this basis, the lean concept is proposed as the guide to establish the lean management system of shipbuilding supply chain. The paper systematically elaborates the key points, difficulties and challenges in establishing the lean management system. It points out that the issues of the shipbuilding supply chain such as short-chain, complexity, low standardization rate and uncertainties should be taken into account when putting forward systematic solutions based on coding, categorization, pallet, planning, suppliers, contract and measurement, so as to provide guidance for the establishment of shipbuilding lean supply chain management.

Key words:lean production; modeling; supply chain management

 

 

 

The Development and Utilization of Administrative Work

Platform for Shipbuilding Enterprises

 

ZHUANG Jianguo, GU Jian

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

 

Abstract: The development of internet technology in recent years shows that informatization not only facilitates the production and business process of shipbuilding enterprises, but also improves the standardization of the administrative work. This paper takes Hudong-Zhonghua as an example to put forward the optimization strategy based on the digital and informatization of work flow. An informationalized platform for administrative work is established to raise the level of institutionalization, streamlining, informatization and standardization, and to standardize the administrative approving procedure, the management and development quality of the enterprise. The practical results show that the platform can significantly improve the efficiency of administration and reduce the cost of administrative office.

Key words:shipbuilding enterprise; administrative work platform; work flow; informatization

 

 

 

Research and Application of Insulation Material

 Statistical Method Based on 3DEXP

 

ZHOU Miaoling, ZHANG Hongwei, ZHU Yu, TANG Neng

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

 

Abstract: There is a lack of quick and effective method for calculating the quantity of insulation material for ship’s interior decoration. The traditional insulation material calculation relies entirely on the measurement and the calculation of 2D drawings, which not only involves huge labor costs and 2~3 months of time, but also leads to a large difference between the statistical results and the actual material quantity, thus a high proportion of material surplus is generated. To solve the issues, full 3D digital insulation design is carried out based on the 3D experience platform. Features of the 3D insulation model such as material, thickness, type and region can be directly obtained via the software’s open interface. The insulation related hull structures are analyzed, and the rapid statistics analysis of the insulation and its related accessories is achieved to make the design consistent with the statistics and based on a single data source. This makes up for the deficiency that the traditional insulation production mode is divorced from the design model. The results of real ship application show that the insulation statistics cycle is reduced and the accuracy of insulation statistics is greatly improved.

 

Key words:3D Experience platform; insulation; quantity statistics