ISO 19905-3:2021
Petroleum and natural gas industries - Site-specific assessment of mobile offshore units - Part 3: Floating units

Standard No.

ISO 19905-3:2021

Release Date

2021

Published By

International Organization for Standardization (ISO)

Latest

ISO 19905-3:2021

Scope

This document specifies requirements and recommendations for the site-specific assessment of mobile floating units for use in the petroleum and natural gas industries. It addresses the installed phase, at a specific site, of manned non-evacuated, manned evacuated and unmanned mobile floating units. This document addresses mobile floating units that are monohull (e.g. ship-shaped vessels or barges); column-stabilized, commonly referred to as semi-submersibles; or other hull forms (e.g. cylindrical/ conical shaped). It is not applicable to tension leg platforms. Stationkeeping can be provided by a mooring system, a thruster assisted mooring system, or dynamic positioning. The function of the unit can be broad, including drilling, floatel, tender assist, etc. In situations where hydrocarbons are being produced, there can be additional requirements. This document does not address all site considerations, and certain specific locations can require additional assessment. This document is applicable only to mobile floating units that are structurally sound and adequately maintained, which is normally demonstrated through holding a valid RCS classification certificate. This document does not address design, transportation to and from site, or installation and removal from site. This document sets out the requirements for site-specific assessments, but generally relies on other documents to supply the details of how the assessments are to be undertaken. In general: — the hull structure and air gap are assessed by use of a comparison between the site-specific metocean conditions and its design conditions, as set out in the RCS approved operations manual; mobile floating drilling units. Equivalent alternative methodologies can be used; — IMCA M 220 is referenced for developing an activity specific operating guidelines. Agreed alternative methodologies can be used. NOTE RCS rules and the IMO MODU code[13] provide guidance for design and general operation of mobile floating units.

ISO 19905-3:2021 Referenced Document

• ISO 13624-1 Petroleum and natural gas industries - Drilling and production equipment - Part 1: Design and operation of marine drilling riser equipment
• ISO 19900 Petroleum and natural gas industries — General requirements for offshore structures
• ISO 19901-1 Petroleum and natural gas industries - Specific requirements for offshore structures - Part 1: Metocean design and operating considerations
• ISO 19901-7 Petroleum and natural gas industries - Specific requirements for offshore structures - Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units*， 2024-04-20 Update
• ISO 19904-1 Petroleum and natural gas industries — Floating offshore structures — Part 1: Ship-shaped, semi-submersible, spar and shallow-draught cylindrical structures
• ISO 19906:2019 Petroleum and natural gas industries — Arctic offshore structures
• ISO 35104 Petroleum and natural gas industries - Arctic operations - Ice management

ISO 19905-3:2021 history

• 2021 ISO 19905-3:2021 Petroleum and natural gas industries - Site-specific assessment of mobile offshore units - Part 3: Floating units
• 2017 ISO 19905-3:2017 Petroleum and natural gas industries - Site-specific assessment of mobile offshore units - Part 3: Floating unit