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BS ISO 19905-3:2021:2022 Edition

BS ISO 19905-3:2021:2022 Edition

$142.49

Petroleum and natural gas industries. Site-specific assessment of mobile offshore units – Floating units

Published By Publication Date Number of Pages
BSI 2022 32
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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:

  • 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;

  • ISO 13624-1 and ISO/TR 13624-2 [ 1 ] are referenced for the assessment of the marine drilling riser of 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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
10 3 Terms and definitions
12 4 Abbreviated terms
13 5 Overall considerations
5.1 General
5.1.1 Competency
5.1.2 Planning
5.1.3 Reporting
5.1.4 Regulations
5.1.5 Classification of unit
14 5.2 Assessment
5.3 Exposure levels
5.4 Selection of limit states
15 5.5 Determination of assessment situations
5.5.1 General
16 5.5.2 Arctic operations and ice
5.5.3 Earthquake
5.6 Models and analytical tools
6 Data to be assembled for each site
6.1 Applicability
6.2 Mobile floating unit data
17 6.3 Stationkeeping data
6.3.1 General
6.3.2 Moored units
6.3.3 Moored units with thruster assist
6.3.4 Dynamically positioned units
18 6.4 Site data
6.5 Data on activity/use limitations
6.5.1 General
19 6.5.2 Reassessment or modification of activity/use limitations
6.5.3 Sources of data and types of activity/use limitations
6.6 Post installation data
7 Actions
20 8 Hull of unit
8.1 Strength
8.1.1 General
8.1.2 Monohull
8.1.3 Semi-submersible
8.1.4 Other hull forms
8.2 Air gap and freeboard
8.2.1 General
21 8.2.2 Monohull
8.2.3 Semi-submersible
8.2.4 Other hull forms
8.3 Temperature
22 8.4 Stability
9 Stationkeeping system
9.1 General
9.2 Moored
9.3 Thruster assisted mooring
9.4 Dynamic positioning systems
10 Activity specific assessments
10.1 General
23 10.2 Assessment of site-specific activities and equipment
10.2.1 General
10.2.2 Marine drilling riser assessment
10.3 Risk assessment
10.4 Activity specific operating guidelines
24 11 Confirmation of compatibility between analysis and as-installed condition
25 Annex A (informative) Outline of an activity specific operating guideline document for a dynamically positioned unit and a moored unit
28 Annex B (informative) Suggested process for completing a site-specific assessment of a mobile floating unit
30 Bibliography

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BS ISO 19905-3:2021
$142.49