Recommends design criteria, construction standards and related safety measures. Appends model safety certificates.

The Assembly, at its twenty-sixth session (23 November to 2 December 2009), adopted by resolution A.1023(26) the Code for the Construction and Equipment of Mobile Offshore Drilling Units, 2009 (2009 MODU Code), which had been developed following a thorough revision of the 1989 MODU Code adopted by resolution A.649(16). In adopting the 2009 MODU Code, the Assembly recalled in particular that, since the adoption of the 1989 MODU Code, the Organization had adopted a significant number of amendments to many of the regulations of the International Convention for the Safety of Life at Sea, 1974 (SOLAS) referenced in the Code, and also that the International Civil Aviation Organization (ICAO) had adopted amendments to the Convention on International Civil Aviation which impacted on the provisions for helicopter facilities as contained in the Code. The 2009 MODU Code provides an international standard for MODUs of new construction which will facilitate their international movement and operation and ensure a level of safety for such units and for personnel on board, equivalent to that required by the 1974 SOLAS Convention and the Protocol of 1988 relating to the International Convention on Load Lines, 1966, for conventional ships engaged on international voyages. The 2009 MODU Code supersedes the 1989 MODU Code for mobile offshore drilling units, the keels of which are laid or which are at a similar stage of construction on or after 1 January 2012. For MODUs constructed before that date, the provisions of the 1989 MODU Code still apply.

The Code for the Construction and Equipment of Mobile Offshore Drilling Units, 2009 (2009 MODU Code) provides an international standard for mobile offshore drilling units (MODU) constructed on or after 1 January 2012. It facilitates their international movement and operation and ensures a level of safety for such units and for personnel on board, equivalent to that required by the 1974 SOLAS Convention and the Protocol of 1988 relating to the International Convention on Load Lines, 1966, for conventional ships engaged on international voyages.This edition of the 2009 MODU Code incorporates the 2013 (MSC.359(92)), 2014 (MSC.384(94) and MSC.387(94)), 2016 (MSC.407(96)) and 2017 (MSC.435 (98)) amendments to the Code.For mobile offshore drilling units constructed before 1 January 2012, the provisions of the previous MODU Codes (1989 and 1979) apply, depending on the date of their construction

This present Code has been developed for the design, construction and operation of offshore support vessels (OSVs) which transport hazardous and noxious liquid substances in bulk for the servicing and resupplying of offshore platforms, mobile offshore drilling units and other offshore installations, including those employed in the search for and recovery of hydrocarbons from the seabed. The basic philosophy of the present Code is to apply standards contained in the Code and the International Code or the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC Code) and in the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) to the extent that is practicable and reasonable taking into account the unique design features and service characteristics of OSVs.

These Guidelines have been developed for the design and construction of new offshore supply vessels with a view to promoting the safety of such vessels and their personnel, recognizing the unique design features and service characteristics of these vessels. Furthermore, these Guidelines provide a standard of safety equivalent to the relevant requirements of the International Convention for the Safety of Life at Sea, 1974, as amended, and in particular to the stability criteria of the Code on Intact Stability for all Types of Ships Covered by IMO Instruments (IS Code), as amended. Provisions fo.