Introduction to Development

for the Design of Oil

Tankers/Bulk Carriers with

Notation CSR in China

CSNAME-CANDI

10 November 2008 Beijing,

China

CSNAME-CANDI

10 November 2008 Beijing,

China

Contents

1. Introduction

2. The features of CSR ship type

3. Proposals for the CSR development in the future

1. Introduction

Review of the situation for the design of ships in compliance with IACS

The change intention of IACS CSR

Review of the situation for the design of ships in compliance with IACS

Convention and Rules Changes induced by the casualties in the two decades Current ship design approach changes have been encouraging

by considering risk control since 1990’s. The mandatory requirements from IMO and authorities and technical standards from Classification Societies are changing more and more severe due to the influence of loss of life, pollution for environment and loss of huge property at sea.

Three casualties by oil tankers, e.g. EXXON VALDEZ, ERICA and PRESTIGE promoted the changes of MARPOL in which oil tankers with single skin construction will be dropped out the marketing of shipping by 2010. IACS issued 15 URs for bulk carriers including new construction and existing fleet.

Common technical standards for both oil tankers and bulk carriers are entry into force by SOLAS in a few years ago, such as PSCS and PMA etc. CO2 emission limitation index (EEDI/EEOI) have been developing since 2003

IACS CSR has been Implementing since1st April 2006

Review of the situation for the design of ships in

compliance with IACS (cont’d)

IMO and ship Owners’ requirements Goal-based Standard (GBS)concept has been discussing

since 2002 The requirements from mandatory, classification,

loading/unloading. shipbuilding industry’s standards, shipping will be bond together in order to solve the incompliance problems induced by the complicated technical policies from multi – sides for many years.

GBS concept will cause the ship design as follows:• Safety level approach with risk;• Ship design life with 25 year;• the North Atlantic environment condition;• Priority of environment prevention.

Review of the situation for the design of ships in compliance with IACS (cont’d)

The development aim of ships classed with IACS CSR is to reach good results of gaining a set of ship type including double hull tankers and bulk carriers through the development, and the ship type is to hold intellectual property designed in China and hold the capacity of building at the current ship type.

The CSNAME, CANDI,CSSC,CSIC,COSCO and CCS joined the development of ship types, over two hundred people directly joined the action.

2. The features of CSR ship type

Advantage concept for the ship classed with CSR ： The following requirements should be satisfied:       

Structure integrity Operational flexibility; Ease of maintenance; Escaping easily and health of crew by green passport Environmental friendliness

Therefore, according to the above principles, the design attention was paid again on ship motion features including optimum for ship resistance under water, seakeeping, stability and subdivision stability, machinery, electrical apparatus and fitting etc. exception for CSR.

Development for the Guidelines for the development of ships classed with CSR

Guidelines for the development of ships classed with CSR

Study for CSR including Rules, explanation of CSR, supplements for CSR and concerned

Study for the concerned convention (SOLAS and MARPOL, Green Ship design)

Study for IACS URs in question, such as URS11.2.3 Development of Software in compliance with CSR Study for the requirements of Owner Organization and

individual owner, such as Shell 、 EXXON Mobil etc. The CSR analysis for existing ships Anti - fatigue design – detail design is asked to apply for

the benchmark ships design

CO2 Emission Limitation （ Bulkers and tankers ）

30000DWT/HANDYSIZE

57000DWT/HANDYSIZE

80000DWT/PANAMAX

T-MAX 174001DWT/ CAPESIZE

176000DWTCAPESIZE

177000DWT/ CAPESIZE

CSDC CSDC 604 708 431 604 431

1 2 3 4 5 6 7

0

1

2

3

4

5

6

7

1 2 3 4 5 6 7

CO2 g/ tkm 建议基准线

CO2 I MO设计计算值（i ntersesi onalmeeti ng af tMEPC57 g/ tkm ）

0

1

2

3

4

5

6

7

1 2 3 4 5 6 7

CO2建议基准线g/ tkm

CO2设计计算值I MO（

i ntersesi onalmeeti ng af tMEPC57 g/ tkm ）

39K （ Prod ）

50K(Prod)76K （ Pro

d ）PANAMAX

108K AFRAMAX

110 （ Prod ）

AFRAMAX

159K SUEZMAX VLCC

guangchuan guangchuan CSDC waigaoqiao CSIC Dalian 708 CSIC Dalian

1 2 3 4 5 6 7

Improvement for ship speed and seakeeping

0

1

2

3

4

5

6

7

1 2 3 4 5 6 7

CO2 g/ tkm 建议基准线

CO2 I MO设计计算值（i ntersesi onalmeeti ng af tMEPC57 g/ tkm ）

1 CO2增加 节航速 设计I MO计算值（

i ntersesi onalmeeti ng af tMEPC57 g/ tkm ）

For example of CSR bulker ， it is very important for designers

to further study ship resistance, seakeeping and propeller

effectiveness.

For example of CSR bulker ， it is very important for designers

to further study ship resistance, seakeeping and propeller

effectiveness.

Detail Design - Nodal points

CCS issued the guidelines for Fatigue Assessment for Hull Structure （ 2007 ） in which a lot of the recommended structure nodal points are available and it is very good application within the process of development of ships classed with CSR, the document covers the following aspects: Reference approach for reducing stress

concentration at the nodal point Improvement of structure continuous Proof of enough shear area at the key connection Suitable cut for welding process Avoiding the nodal points that will fall into lower

fatigue life Avoiding the nodal points in which there are both

lower fatigue life and post- buckling during service life

Extended CSR requirements

CSR Tanker Sloshing 4.2.1.1 The sloshing pressures given in 4.2.2 to 4.2.4 are

pressures induced by free movement of the tank liquids as a result of ship motions.

4.2.1.2 The given pressures do not include the effect of impact pressures due to high velocity impacts with tank boundaries or internal structures. For tanks with effective sloshing breadth, bslh, greater than 0.56B or effective sloshing length, lslh, greater than 0.13L, an additional impact assessment is to be carried out in accordance with the individual Classification Society procedures.

Therefore it is necessary to carry out the study on both sloshing theory and testing in lab.and software development.

Sloshing study for theory and testing in Lab.

Key point is on the enlarging course dynamically of sloshing motion characteristic: loads induced by liquid sloshing motion

including dynamic load and quiet load, but the dynamic load is governing load that reaches assaults function.

Supplement for CSR Tanker——Guidelines for Sloshing Analysis

in order to let designers to use the outcomes in convenience , the draft guidelines for application of structural assessment for the ships with liquid carriage was developed. Which covers: the sloshing phenomenon and pressures induced by

sloshing loads in the tanks Load cases Movement level and Basic formulae Numerical calculation of sloshing loads Structural analysis by using Numerical calculation of

sloshing loads Criteria

CSR ship types

Ship type 类型 Designer Actual ship type

17 万吨级 DSS 431 177K DSS

17 万吨级 SSS 604 170K SSS

9 万吨级 DSS 708 90K DSS

8 万吨级 DSS 604 80K DSS

5 万吨级 SSS 重工船舶设计中心 53K DSS

3 万吨级 DSS 重工船舶设计中心＋新港船厂 35K DSS

30 万吨级 VLCC 大船重工 298K 、 308K

16 万吨级 SUEZMAX 708 研究所 159K

（原油） AFRAMAX 708 研究所 + 外高桥 108K

（成品） AFRAMAX 大船重工 110K

7 万吨级 PANAMAX 重工船舶设计中心 76K

4-5 万吨级 HANDYMAX 广船国际 50.5K

各种船型技术特色 ( 续）

No. 散货船船型 设计单位 开发状态 备注

1 8000 DWT 宁波东方船舶设计有限公司 已完成 SmallBulk

Carrier

2 10800 DWT 浙江现代船舶设计研究所 已完成

3 20800 DWT 宁波东方船舶设计有限公司 已完成

handysize

4 21800 DWT 浙江现代船舶设计研究有限公司 已完成

5 23000 DWT 上海京荣船舶工程设计有限公司 进行中

6 27000 DWT 福州海洋船舶研究所 已完成

7 30000 DWT 上海佳豪船舶工程设计有限公司 进行中

8 32000 DWT 上海佳豪船舶设计有限公司 已完成

9 35000 DWT 上海佳豪船舶设计有限公司 已完成

10 37000 DWT 浙江欣海船舶设计研究院 已完成

11 50000 DWT 上海佳豪船舶工程设计有限公司 已完成handymax

12 54500 DWT 上海佳豪船舶工程设计有限公司 已完成

13 58000 DWT 上海佳豪船舶设计有限公司 已完成

14 75000 DWT 沪东中华造船有限公司 已完成 panamax15 87000 DWT 沪东中华造船有限公司 已完成

16 93000 DWT中船重工船舶设计研究中心有限

公司 已完成 Post-panamax17 116000 DWT 沪东中华造船集团有限公司 已完成

18 177000 DWT 上海外高桥造船有限公司 已完成capes

ize19 180000 DWT中船重工船舶设计研究中心有限

公司 已完成表 表

CSR ship types

No. 油船船型 船厂 /设计单位 开发状态 备注

1 29000 DWT 广州广船国际股份有限公司 已完成

2 38000 DWT 广州广船国际股份有限公司 已完成

3 72000 DWT 沪东中华造船有限公司 进行中

4 76000 DWT 大连船舶重工集团有限公司 进行中

5 163000 DWT 渤海船舶重工有限责任公司 已完成

6 308000 DWT 大连船舶重工集团有限公司 进行中

共计 37型共计 37型

Technical index

3. Proposals for the CSR development in the future

Through comparison among IACS guidelines, CSR and IIW guidelines, we would like to offer the following comments: ( 1) Different methods between tankers and bulkers in IACS CSR

should be unified and come up to the recommendatory file of IIW, such as the model definition of the hot stress, the hot stress computing technology etc

( 2) Loads and load historical of bulk carriers, such as distribution coefficient loading condition should further be discussed again. The time proportion of heavy ballast is too large

( 3) Considering the influence on stress concentration of after welding by using some method, such as TIG etc

(4 ） correcting method for HTS while considering fatigue life

IIW - for example

The welding seams should be considered in fatigue life as recommendation by IIW.

Thank you for your attention！Thank you for your attention！