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Last update: 2026/06/02
This Technical Information became null and void on 3 Apr 2025.
Rules concerning computer-based systems (IACS UR E22 (Rev.3) related)
IACS UR E22 (hereinafter referred to as "UR E22") is unified requirements relating to computer-based systems used on vessels, which has recently been amended and adopted as UR E22 (Rev.3) to better clarify the requirements, specific to each of the phases of design, development, commissioning, and maintenance. ClassNK has amended Rules to involve incorporating UR E22 (Rev.3) into Rules/Guidance for the Survey and Construction of Steel Ships, Part X that have been newly established (scheduled to come into effect in July 2024). Contemporaneously with the amendments, existing Part D, Chapter 18, Annex 18.1.1 of the Rules and Guidance for the Survey and Construction of Steel Ships, which specifies the requirements pursuant to UR E22 (Rev.2), has been deleted.IACS Recommendation No.172 in relation to Energy Efficiency Existing Ship Index (EEXI)
At the 76th session of the IMO Marine Environment Protection Committee (MEPC76) held in June 2021, further amendments to MARPOL Annex VI were adopted (IMO Resolution MEPC.328(76)) to implement the Energy Efficiency Existing Ship Index (EEXI) and will enter into force on 1 November 2022. This is information that IACS developed EEXI Implementation Guidelines and established as IACS Recommendation No.172 to support to the Resolutions MEPC.335(76), MEPC.350(78) and MEPC.351(78) relating to EEXI. The IMO guidelines mentioned in this Technical Information are available on the ClassNK website's EEXI regulation section. HOME > Product & Service > Statutory Service > EEXI For any questions about the above, please contact: NIPPON KAIJI KYOKAI (ClassNK) MariAmendment to the ClassNK Rules and Guidance related to computer based systems
ClassNK has informed the requirements related to computer based systems by ClassNK Technical Information TEC-1114 issued on 16 June 2017 (revoked) and TEC-1145 issued on 28 February 2018. In view of the recent situation, ClassNK reviewed the contents of the Technical Information TEC-1145 and has issued TEC-1235 alternatively. ClassNK Technical Information TEC-1145 is revoked by this Technical Information. IACS UR E22 (Rev.1) specified requirements related to configuration and function of computer based systems used for systems such as control, alarm, and safety systems. These requirements have already been incorporated in Rules and Guidance of NIPPON KAIJI KYOKAI (hereinafter referred as "the Society"). Furthermore, IACS has focused on the importance ofThis Technical Information became null and void on 14 May 2021.
Amendment to the ClassNK Rules and Guidance related to computer based systems
ClassNK has informed the requirements related to computer based systems by ClassNK Technical Information TEC-1114 issued on 16 June 2017. After issuing of the Technical Information, ClassNK reviewed the contents of the Technical Information and has issued TEC-1145 alternatively. The ClassNK Technical Information TEC-1114 is revoked by this Technical Information. IACS UR E22(Rev.1) specifies requirements related to composition and function of computer based systems used for machinery systems such as monitoring systems. These requirements have already been incorporated to Rules and Guidance of NIPPON KAIJI KYOKAI (hereinafter referred as "the Society"). Since the necessity for security measures which reduce risks specific to computer based systems suchThis Technical Information became null and void on 28 Feb 2018.
Amendment to the ClassNK Rules and Guidance related to computer based systems
IACS UR E22(Rev.1) specifies requirements related to composition and function of computer based systems used for machinery systems such as monitoring systems. These requirements have already been incorporated to Rules and Guidance of NIPPON KAIJI KYOKAI (hereinafter referred as "the Society"). Since the necessity for security measures which reduce risks specific to computer based systems such as computer viruses has been increasing in recent years, IACS discussed way to clarify requirements and adopted UR E22(Rev.2) in June 2016, which specifies responsibilities of stakeholders, security measures for software and hardware and quality management for said systems. Accordingly, relevant requirements in the Society's Rules and Guidance were amended and whatThis Technical Information became null and void on 5 Jul 2024.
IACS Procedural Requirement No.38 (Rev.1) in relation to Energy Efficiency Design Index (EEDI)
The relevant information on IACS Procedural Requirement No.38 (hereinafter, PR38) in relation to the EEDI required by Chapter 4 of MARPOL ANNEX VI has already been provided in ClassNK Technical Information No. TEC-0956. Since the amendments to IACS PR38 (Rev.1) have been issued, the Technical Information is revised as described below. The said ClassNK Technical Information No. TEC-0956 is thus revoked, accordingly. A Joint Industry Working Group on the EEDI (JWG/EEDI), formed by IACS and other industries such as shipowners, shipbuilders, research institutes, etc., developed "Industry Guidelines (first version)" to provide details and examples of calculating attained EEDI as well as support the method and role of the verifier in charge of conducting the sEffective scheduled date applicable to amended ClassNK Rules and Guidance related to tests of diesel engines
IACS has adopted Unified Requirements M51(Rev.4), M71, M72(Corr.1), M73 and Z26 related to tests of diesel engines. Accordingly, relevant ClassNK Rules and Guidance are being amended based upon these Unified Requirements. Please note that the effective scheduled date of the amended Rules and Guidance is as follows: 1. The amended Rules and Guidance will be applied to engines whose applications for approval are submitted to ClassNK on or after 1 July 2016. 2. Requirements related to shipboard trials of diesel engines (IACS UR M51.4), however, only apply to the following engines: i) engines whose applications for approval are submitted to ClassNK on or after 1 July 2016; or ii) engines installed on new ships whose contracts for construction are dated onAdoption of IACS UI SC262
Amendment of the International Code for Fire Safety Systems (FSS Code) Chapter 6 was adopted as IMO Resolution MSC.327(90) at the 90th session of the IMO Maritime Safety Committee (MSC90) held in May 2012 and will be applied to ships constructed on or after 1 January 2014. Chapter 6 of this code specifies that sufficient foam-generating capacity shall be provided to ensure the minimum design filling rate for the system is met and in addition shall be adequate to completely fill the "largest protected space" within 10 minutes. In order to clarify the extent of the "largest protected space", IACS newly adopted UI SC262. This UI clarifies that the extent of the largest protected space is up to the lowest part of the casing or the level 1m above the higAdoption of IACS UI SC191 (Rev.5)
Unified Interpretations on the technical provisions for permanent means of access for inspections required by SOLAS II-1/3-6 were approved as MSC.1/Circ.1464 (the amendments to MSC.1/Circ.1176 and MSC.1/Circ.1197) at the 92nd session of the IMO Maritime Safety Committee (MSC92) held from 12 to 21 June 2013. The amendments are based on UI SC191 (Rev.4), however, it was agreed not to include the interpretations that openings for passage may be reduced (Technical Provisions para. 3.10 and 3.11) in the amended circular. Based on this result of MSC92, IACS adopted UI SC191 (Rev.5) in line with the concerned IMO Circulars. Please take note that this revised UI is to be applied to ships contracted for construction on or after 24 June 2013. For any questionThis Technical Information became null and void on 22 Jun 2016.
IACS Procedural Requirement No.38 (PR38) in relation to Energy Efficiency Design Index (EEDI)
With regard to the Energy Efficiency Design Index (EEDI) required by the revised MARPOL ANNEX VI which entered into force on 1 January 2013, this is information that IACS Procedural Requirement No.38 (hereinafter, PR38) has been established to provide the unified procedures for calculation and verification of the EEDI. 1. Background A Joint Industry Working Group on the EEDI (JWG/EEDI), formed by IACS and other industries such as shipowners, shipbuilders, research institutes, or similar industry based organizations, etc., developed "Industry Guidelines (first version)" to provide details and examples of calculating attained EEDI as well as support the method and role of the verifier in charge of conducting the survey and certification of EEDI in complianThis Technical Information became null and void on 12 Jul 2017.
Steering gear test with the vessel not at the deepest seagoing draught
IACS Unified Interpretation SC 246 for SOLAS II-1/Regulation 29 is applied to ships contracted for construction on or after 1 July 2012. According to the unified interpretation, when trials are conducted with the vessel not at the deepest seagoing draught, the loading condition may be accepted on either one of the following conditions unless any specific instruction is provided by the flag administration (*). (a) Trial is conducted on the condition that the rudder is fully submerged (at zero speed waterline) and the vessel is in an acceptable trim condition. (b) Trial is conducted at its as deep draft condition as practicable, provided that the rudder load and torque at the trial loading condition have been reliably predicted and extrapolated to the fullVerification for the Material and Equipment not containing asbestos
Regarding Verification for the Material and Equipment not containing asbestos which were informed by ClassNK Technical Information No. TEC-0904 of 15 May 2012, ClassNK will carry out surveys as follows based on IACS Unified Interpretation SC249. Thank you for your understanding and cooperation in this matter. This Technical Information supersedes ClassNK Technical Information No. TEC-0904. 1. Application Ships engaged on international voyages (ships not engaged on international voyages comply with the instruction of the flag administration) 2. Surveys (1) New ships: applied to ships constructed on or after 1 July 2012 ClassNK reviews an asbestos-free declaration and supporting documentations during Classification Survey During Construction. (2) ShThis Technical Information became null and void on 22 Jun 2012.