ISO 19905-3 pdf download Petroleum and natural gas industries — Site-specific assessment of mobile offshore units — Floating units
This document specifies requirements and recommendations for the site-specific assessment of mobilefloating units for use in the petroleum and natural gas industries. It addresses the installed phase, at aspecific 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 amooring system, a thruster assisted mooring system, or dynamic positioning.The function of the unitcan be broad, including drilling, floatel, tender assist, etc.In situations where hydrocarbons are beingproduced, there can be additional requirements.
This document does not address all site considerations, and certain specific locations can requireadditional assessment.
This document is applicable only to mobile floating units that are structurally sound and adequatelymaintained, 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 removalfrom site.
This document sets out the requirements for site-specific assessments, but generally relies on otherdocuments to supply the details of how the assessments are to be undertaken. In general:
-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
metocean conditions and its design conditions, as set out in the RCS approved operations manual;IS0 13624-1 and ISO/TR 13624-2[0 are referenced for the assessment of the marine drilling riser ofmobile floating drilling units.Equivalent alternative methodologies can be used;
IMCAM 220 is referenced for developingan activity specific operating guidelines.Agreed alternativemethodologies can be used.
NOTE RCS rules and the IMO MODU code13l provide guidance for design and general operation of mobilefloating units.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies. Forundated references, the latest edition of the referenced document(including any amendments) applies.
ISO 13624-1, Petroleum and natural gas industries —Drilling and production equipment — Part 1: Designand operation of marine drilling riser equipment
ISO19900, Petroleum and natural gas industries —General requirements for offshore structures
ISO 19901-1,Petroleum and natural gas industries —Specific requirements for offshore structures 一Part 1: Metocean design and operating considerations
ISO 19901-7, Petroleum and natural gas industries — Specific requirements for offshore structures 一Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
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 structuresISO35104,Petroleum and natural gas industries — Arctic operations — Ice management
International Marine Contractors Association,”Guidance on Operational Activity Planning”,IMCAM 2203Terms and definitions
For the purposes of this document, the terms and definitions given in IS0 19900,ISO 19901-1,ISO 19901-7,ISO 19904-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:- ISo online browsing platform: available at https://www.iso .org/obp
一IEC Electropedia: available at http://www.electropedia .org/
activity specific operating guidelinesAsoG
document that sets out the activities that need to be undertaken at specific alert level thresholds (3.4)for specified changes in conditions
Note 1 to entry: These guidelines are in a document that sets out high level actions to be undertaken at specificalert level thresholds.
Note 2 to entry: The ASOG for drilling operations is often called the well specific operating guidelinedocument (wsoG).
Note 3 to entry: An example ASOG for DP (dynamic positioning) and moored units is given in AnnexA.3.2
distance between the highest water elevation and the lowest exposed partofthe primary deck structureand permanent equipment not designed to withstand associated environmental action effects
[SOURCE:ISO 19900:2019,3.5, modified — “structure” and “action effects” not defined herein,”andpermanent equipment” added and “for defined return period” deleted.]