ISO 19905-3:2021 pdf download.Petroleum and natural gas industries — Site-specific assessment of mobile offshore units
1 Scope
— ISO 19901-7 is referenced for the assessment of the stationkeeping system;
— ISO 19904-1 is referenced to determine the effects of the metocean actions on the unit;
— ISO 19906 is referenced for arctic and cold regions;
— the hull structure and air gap are assessed by use of a comparison between the site-specific
— ISO 13624-1 and ISO/TR 13624-2 [1] are referenced for the assessment of the marine drilling riser of
— IMCA M 220 is referenced for developing an activity specific operating guidelines. Agreed alternative
2 Normative references
Petroleum and natural gas industries — Drilling and production equipment — Part 1: Design and operation of marine drilling riser equipment
Petroleum and natural gas industries — General requirements for offshore structures
Petroleum and natural gas industries — Specific requirements for offshore structures —Part 1: Metocean design and operating considerations
Petroleum and natural gas industries — Specific requirements for offshore structures —Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
Petroleum and natural gas industries — Floating offshore structures — Part 1: Ship-shaped,semi-submersible, spar and shallow-draught cylindrical structures
Petroleum and natural gas industries — Arctic offshore structures
Petroleum and natural gas industries — Arctic operations — Ice management
International Marine Contractors Association, “Guidance on Operational Activity Planning”, IMCA M 220
3 Terms and definitions
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia .org/
3.2 air gap
[SOURCE: ISO 19900:2019, 3.5, modified — “structure” and “action effects” not defined herein, “and permanent equipment” added and “for defined return period” deleted.]
6.2 Mobile floating unit data
— type of unit;
— the latest revision of the drawings, relevant specifications and the operations manual, including
— wind, wave, and current action coefficients for calculating metocean actions and displacements,
— design parameters including, where applicable, any proposed deviations for the intended operation;
— details of any modifications relevant to the stationkeeping and its current capabilities;
— assurance that all stationkeeping equipment is fully operational;
— motion RAOs used for determining dynamic loading for mooring and riser analysis (if applicable for
— equipment data where applicable, e.g. riser or tensioner system data, timing of emergency disconnect
— preferred rig heading.
6.3 Stationkeeping data
General
6.3.1 The history of the stationkeeping system’s use should be maintained. These data can be used to help
6.3.2 Moored units
— mooring line component details including length, size, strength, stiffness, construction, etc.;
— mooring winch type and holding capacity;
— documentation that the mooring system components are in conformity with relevant inspection
6.3.3 Moored units with thruster assist
— thruster details;
— circumstances under which thrusters will be used;
— details of thruster control;
— thruster efficiencies and interaction limits;
— worst single point failure in the thruster system, for use in the damaged condition assessment
ISO 19905-3:2021 pdf download
