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Transcript of 1 Houston Tanker Event 2007 Houston, TX 26 March 2007 Common Structural Rules for Tankers Gary Horn,...
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Houston Tanker Event 2007
Houston, TX 26 March 2007
Common Structural Rules for Tankers
Gary Horn, P.E.Director, TechnologyABS Houston
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IACS Common Structural Rules
AIM:To develop a set of unified Rules and Procedures for the
determination of the structural requirements for oil tankers and bulk carriers
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Tanker Operations
Tanker incidents by cause 1978-2004
Source: Intertanko
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Tanker Operations
Improvements made in tanker operational, safety and pollution performances
We have “come a long way…”
However, we wanted to employ continuous improvement principles and take the next step…
Common Structural Rules intended to enhance safety, robustness and durability.
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IACS Common Structural Rules
CSR for Bulk Carriers Complete set of Structural Rules for
SSS and DSS Bulk Carriers
Length greater than or equal to 90m
CSR for Tankers Complete Set of Structural Rules for
Double Hull Oil Tankers
Length greater than or equal to 150m
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Features of the new CSR
1. Rules are to result in common scantling requirements
2. Net scantling approach includes a clear link between newbuilding strength checks and in-service gauging review standards
3. Include coating standard criteria
4. Fatigue standard enhanced to include exposure to North Atlantic environment with minimum life of 25 years
5. Includes the results from industry input and feedback
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IACS Common Structural Rules
Section Topic1
2
3
4
5
6
7
8
Introduction
Underlying Principles
Rules Applications
Basic Information
Structural Arrangement
Material and Welding
Loads
Scantling Requirements
Section Topic
9
10
11
12
A
B
C
D
Design Verification
Buckling and Ultimate- Strength
General Requirements
Renewal Criteria (SiO)
Hull Girder Ultimate Strength
Structural Strength Assessment
Fatigue Strength Assessment
Buckling Strength Assessment
Tankers
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CSR/Tanker - Overview
Deck housesSection 11/1
Fore and Aft EndsSection 8/3 & 8/5
Plating and LocalSupport Members
Section 8/2
Longitudinal StrengthSection 8/1
Criteria AssessmentYield, Shear,
Buckling
Primary SupportMembers Inc Bhds
Section 8/2.6
Scantling Requirements
Sloshing and ImpactSection 8/6
Structural designdetails (welding,
brackets)Section 4/3
Machinery SpaceSection 8/4
Strength Assessment(FEM)
Section 9/2
Hull Girder UltimateStrength
Section 9/1
Criteria Assessment
Fatigue StrengthSection 9/3
Nominal StressApproach
Appendix C/1
Global Cargo TankStructural Strength
AnalsisAppendix B/2
Design Verification
Local Fine MeshStructural Strength
AnalysisAppendix B/3
Evaluation of HotSpot Stress for Fatigue
AnalysisAppendix B/4
Criteria AssessmentFatigue Damage
Hot Spot Stress (FE)Approach
Appendix C/2
Criteria AssessmentYield, Shear,
Buckling
MinimumRequirements
Minimum ThicknessSection 8/2
Other MinimumRequirements
Stiffness andProportionsSection 10/2
Hull Girder Inertiaand Section Modulus
Section 8/1
GeneralRule Requirements
Basic InformationSection 4
StructuralArrangements
Section 5
MaterialsSection 6
General DetailedRequirements
Section 11
Design Requirements
OperationalRequirements
Section 2/4
Design BasisSection 2/5
Loading ManualSection 8/1
Loads
Static LoadsSection 7/2
Dynamic LoadsSection 7/3
Impact and SloshingLoads
Section 7/4
Load CombinationsSection 7/6
Static LoadCombinations
Section 7/6
Static Plus DynamicLoad Combinations
Section 7/6
Dynamic LoadCombination FactorsDLCFs Section 7/6.5
Accidental LoadsSection 7/5
Design Require-ments
General Rule
Require-ments
Minimum
Require-ments
Loads
Scantling Requirement
s
Design Verification
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CSR & Coating Performance Standards
Promote effective use of protective coatings
Provide a protective barrier to delay onset of corrosion, noting;
Corrosion wastage allowance is still included in rules Wastage allowances are not reduced due to presence of coatings
Target useful coating life of 15 years
Added benefit – facilitate in-service inspection Top coat to be a light color to easily distinguish from rust
RequiredRenewalThickness
WastageAllowance
Annual ThicknessMeasurements
Predicted corrosion
in 2.5 years (0.5 mm)
Protective Coating
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Coating Performance Standards
IMO Res MSC.215(82) Performance Standard for Protective Coatings for Dedicated Seawater Ballast Tanks in All Types of Ships and Double-Side Skin Spaces of Bulk Carriers
IACS PR No. 34, IACS Procedural Requirement on Application of the IMO PSPC under IACS Common Structural Rules for Bulk Carriers and Oil Tankers
IACS Common Interpretation and answers to frequently asked questions on IACS website www.iacs.org.uk
ABS Guide for the Class Notation Coating Performance Standard (CPS), December 2006
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CSR Rule Status CSR - effective date 1 April 2006
Tanker updates:
Corrigenda 1 – effective date 1 April 2006
Corrigenda 2 – effective date 1 April 2006
Rule Change Notice (RCN) No. 1 – effective date 1 April 07 or earlier if agreed between yard and owner
All future updates to follow IACS process:
PR32
Hull Panel
Project Teams
Rule updates and maintenance
Rule interpretations, Q/A
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CST/Tanker RCN No.1 Effective 1 April 2007, may be applied earlier if agreed
by builder and owner.
Can not be partially applied
Contents:
Corrosion additions for heated cargo tanks
Clarification of heavy ballast condition
Buckling assessment in way of bottom portion
FE analysis of tight floor, girders and webs
Slenderness ratio of bulb profiles
Deck equipment welding
Tolerance of hopper knuckle connection
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Oil Tanker Orders - Gross Tons
Oil Tanker N/C ContractsMonthly KGT
0
2,000
4,000
6,000
May-06 Jun-06 Jul-06 Aug-06 Sep-06 Oct-06 Nov-06 Dec-06 Jan-07 Feb-07
Worldwide
Source of feedback…
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Oil Tanker Orders – Number of orders
Oil Tanker N/C ContractsMonthly Count
0
20
40
60
80
100
May-06 Jun-06 Jul-06 Aug-06 Sep-06 Oct-06 Nov-06 Dec-06 Jan-07 Feb-07
Worldwide
Source of feedback…
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IACS Project Teams for CSR Maintenance
IACS implemented 2 Project Teams for CSR Maintenance Active from 1st June 2006 PT for Bulk Carriers: 3 JBP + 1 JTP members PT for Oil Tankers: 3 JTP + 1 JBP members Rotation among members every 2 years Running of the PT governed by IACS procedure IACS COUNCIL
HULL PANELChairman: T. Yoneya
CSR Bulk Carriers
K. ABEABS
G. CESARINEBV
S. HARADAProject Manager
ClassNK
A. Schulz-HeimbeckGL
CSR Oil Tankers
P. BAUMANSBV
F. CHENGLR
R. NAGAYAMAABS
P. SALTVEDTProject Manager
DNV
PERMANENTSECRETARIAT
R. Leslie
CSR SecretariatG-Y Han
SG/CSRNK, LR, BV, ABS
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IACS CSR Knowledge Center/Database Centralized mechanism for collecting, categorizing and storing
questions and answers, feedback and responses, tasks and pending actions, interpretations and rule changes
Basis for future improvements
External access to Q&A and Interpretations from IACS Web Site
Transparency and consistent implementation of the Rules
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GBS Overview
Basic Principles of Goal-Based Standards Broad, over-arching safety, environmental
and/or security standards that ships are required to meet during their lifecycle
The required level to be achieved by the requirements applied by Class Societies and other ROs, Administrations and IMO
Clear demonstratable, verifiable, long standing, implementable and achievable irrespective of ship design and technology; and
Specific enough in order not to be open to differing interpretations
IMO
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Tier V
Tier I
Tier III
Tier IV
Tier II
IMO
IMO
IMO
IACS
Industry
GBS Overview
Procedures and Quality Systems
Requirements, Rules and Industry Standards
Verification and Acceptance criteria
FunctionalRequirements
Goals
IACS CSR for Oil Tankers & Bulk Carriers
IMO
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Influence of GBS on future CSR developments
Structural residual strength: the CSR partially cover the GBS intent, but additional work necessary to define assumed extent of structural damage, environmental loads and acceptance criteria
Structural redundancy: the CSR partially cover the GBS intent, but additional work necessary to develop method to confirm structural redundancy and structural hierarchy
Reference to other standards: cross reference other regulations or standards
Human element Design transparency Survey and maintenance Structural accessibility Recycling considerations
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Why Common Structural Rules?
An improved structural standard.
A major aspect in a complex yet integrated set of initiatives with the goal of improving performance for the safety of life, property and the marine environment.
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Thank you
Common Structural Rules for Tankers
Gary Horn, P.E.Director, Technology
ABS Houston