Who we are

CIMAC WG2 represents engine builders, engine designers and worldwide suppliers and consists of: 

  • Twenty-six members from following the countries: Austria, United States, Korea, Japan, Norway, Sweden, Finland, Germany, UK, Holland, Italy, Switzerland and Denmark,
  • Japanese members from Japanese engine builders association (JICEF),
  • The Chairman of the International Association of Classification Societies Machinery Panel (IACS MP),
  • One member each from ABS, KR, DNV-GL and from Bureau Veritas.


What we do

Aim and scope of working group 2:
  • To discuss and approve unified class rules with the IACS Machinery Panel for the benefit of the global marine industry. The IACS has approved CIMAC WG 2 as the only notified body regarding class rules.
  • To adjust the existing class rules so that they comply with current technical developments of diesel engines and their auxiliary systems.
  • To participate in joint meetings with the IACS Machinery Panel in order to exchange views and thereby contribute to both theoretical and practical inputs to new or revised class rules.
  • To coordinate the input of other CIMAC WGs to IACS Machinery Panel.
  • To prepare CIMAC publications.


Our current projects and activities

  • Cofferdam Height (ST-11-060)
  • Comments to IACS UR on Harmonized Application Forms (proposal CL-14-001) (PM13926).
  • Subgroup and proposal for “Terms and Definitions” towards IACS MP.
  • Sub-group “Propeller damping”.
  • Sub-group “Use of fuel with different properties”.
  • Sub-group “Turbocharger”.
  • Sub-group “FAT & TAT of engines”.
  • Sub-group “Ventilation air double wall piping”.


Latest publications


CIMAC WG2 proposals towards IACS Machinery Panel

  • Comments to IACS UR on Harmonized Application Forms (proposal CL-14-001) (PM13926).
  • Comments to IACS UR on gas engines using low pressure gas (PM6902) in co-operation with WG15 and WG17.
  • Comments to IACS Revision of UR M44 (PM9906).
  • Comments to IACS FMEA in M44 (PM12918) in co-operation with WG15.
  • Comments to IACS on UR M53 Appendices IV – VI (PM11100) in co-operation with WG4.
  • Comments to IACS UR on Harmonized Content of Type Approval Certificates (PM15903).
  • 20 July 2015, CIMAC WG2 submitted a position paper regarding “Harmonized Terms and Definitions”.
  • 22 July 2015 CIMAC WG2 submitted a statement towards IACS Machinery Panel “Collaboration from the very beginning of IACS UR and UI”.


Meeting activities

  • Two ordinary CIMAC WG 2 meetings per year.
  • One or two meetings per year in smaller sub groups regarding special projects.
  • One joint meeting with all the classification societies (IACS Machinery Panel) per year.

In the joint meeting, only the chairman, the secretary and a few members very involved in specific matters will participate from WG 2. In the joint meeting also the chairpersons of WG 4, WG 15 and WG 17 will participate if needed.