February 14 2013

February 14

GREEK SECTION: REPORT ON THE FEB 14, 2013 TECHNICAL MEETING

Topic: “Introducing the Harmonized Common Structural Rules for Tankers

and Bulkers’’

Report by P. Lalangas

On February 14, 2013 the Greek Section had its fifth technical meeting for the

2012-13 season. In the presence of 36 members and 12 non-members Dr. John

Kokarakis, Vice President, Technology and Business Department at Bureau

Veritas (BV), Greece and Vice Chair of the Greek Section presented the above

topic.

As Dr. Kokarakis pointed out the “Common Structural Rules” (CSR) were

developed separately for Tankers and Bulk Carriers. The International

Association of Classification Societies (IACS) agreed to harmonize the rules,

producing a common part and a part for ship type specific requirements. Specific

requirements cover the inner bottom reinforcements due to steel coil loading,

side frames of bulk carriers and prescriptive rules for primary members of oil

tankers. Key elements in the harmonization process such as wave loads, fatigue,

finite element analysis and buckling were discussed and analyzed. Innovations

in the rules were presented such as the check of corrosion additions with the

addition of ships in the database of gauging. Another new element in the CSR

is the addition of procedures and rules for direct analysis of the fore-most and

the aft-most cargo hold regions. Buckling assessment has been enhanced in

the harmonized rules with the introduction of a new Closed Form Method. The

new rules include a mandatory list of details to be assessed by FE analysis.

Fatigue assessment procedures have been also enhanced and a new screening

assessment method is introduced. The presentation covered the main elements

of the harmonized rules and pinpointed the innovations.

The author presented the following major items in detail:

-The scope & general principles of the CSR rules.

-The corrosion additions for various structural items.

-Type of welds to be used in highly stressed areas.

-Fatigue evaluation and acceptance criteria

-Buckling checks to be made.

-Expected percentage weight increase in various tanker sizes due to the

CSR rules.

The meeting was concluded with the usual reception in an adjacent hall of the

Maran Tankers Management building.

NTUA Prof. Emeritus Andonis Antoniou congratulates the author
J. Kokarakis, his student from some 30 years ago.

from left to right : C. Kontovas, EC Member;
J. Kokarakis, Author & Vice Chair; P. Lalangas Secretary/Treasurer and
S. Hatzigrigoris, Sub. EC Member.