Press Release

Initial GBS verification process for IACS Common Structural Rules completed

20 June 2017
London – IMO Maritime Safety Committee has confirmed completion of the corrective actions requested by IMO to the International Association of Classification Societies’ (IACS) Common Structural Rules for Bulk Carriers and Oil Tankers (CSR BC&OT) under the agenda item 6, Goal-Based New Ship Construction Standards (GBS) at its 98th session held on 7 June 2017.

Previously, MSC96 confirmed CSR BC&OT complied with GBS in 2016, and the ships constructed in compliance with the rules at that time should be deemed as compliant with GBS. At that time, IMO requested IACS and its member societies to carry out corrective actions for non-conformities identified as part of the initial verification process. At the MSC98 it was confirmed that IACS’s corrective actions including the rule amendments were completed. The completion of the initial GBS verification process paves the way for the latest ship designs and structures based on CSR BC&OT.

“ClassNK welcomes the confirmation for CSR BC&OT made at MSC 98. As a member of IACS, ClassNK has extensively worked to complete the corrective actions in line with the IMO’s requests as well as develop CSR BC&OT. On top of this, ClassNK has also supported the industry’s compliance to CSR BC&OT with the world’s first innovative CSR-BC&OT design support tool, PrimeShip-HULL(HCSR). The software was recently updated in February 2017 to incorporate the rule amendments which were implemented as the corrective actions. ClassNK will continue providing innovative solutions such as PrimeShip-HULL(HCSR) to ensure the further safety of ships.” said Dr. Toshiro Arima, Director of ClassNK’s Rule Development Division.

PrimeShip-HULL(HCSR) is comprised of prescriptive rule calculation software and direct calculation software, improving the efficiency of the design process through shorter design lead times, structural optimization and improved design quality. The prescriptive rule calculation
software can be used to rapidly examine cross sections to determine optimal structural
arrangements and scantlings, and consider structural arrangements in consideration of
longitudinal distribution of the rule requirements by using 3D models which can be used to
geometric data for Finite Element models. The direct strength assessment software can be
used to automatically create FE models, study various reinforcement plans to structural
members where do not meet rule criteria, and carry out comprehensive analyses of the required
three hold models automatically partitioned from whole ship FE models.

PrimeShip-HULL(HCSR) can be used with design software such as NAPA Steel and other
CAD software available on the market to prevent input errors and dramatically reduce design
man hours.

Applications for PrimeShip-HULL(HCSR) can be downloaded from the ClassNK website:

Left: Prescriptive rule calculation software: Initial design function/ ultimate strength evaluation results
Right: Direct strength assessment software: Comprehensive analyses with whole ship FE models

ClassNK - EOD