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

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Petroleum and natural gas industries — Site-specific assessment of mobile offshore units —Part 3: Floating units是国际标准化组织(International Organization for Standardization，简称ISO)于2021-03发布的ISO标准，适用于国际，世界范围。

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Petroleum and natural gas industries — Site-specific 

assessment of mobile offshore units —

Part 3:

Floating units

1 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:

— 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;

[1]

— ISO 13624-1 and ISO/TR 13624-2 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.

[13]

NOTE RCS rules and the IMO MODU code provide guidance for design and general operation of mobile

floating units.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated 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: 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

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

International Marine Contractors Association, “Guidance on Operational Activity Planning”, IMCA M 220

3  Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 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

— IEC Electropedia: available at http:// www .electropedia .org/

3.1

activity specific operating guidelines

ASOG

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 specific

alert level thresholds.

Note 2 to entry: The ASOG for drilling operations is often called the well specific operating guideline

document (WSOG).

Note 3 to entry: An example ASOG for DP (dynamic positioning) and moored units is given in Annex A.

3.2

air gap

distance between the highest water elevation and the lowest exposed part of the primary deck structure

and permanent equipment not designed to withstand associated environmental action effects

[SOURCE: ISO 19900:2019, 3.5, modified — “structure” and “action effects” not defined herein, “and

permanent equipment” added and “for defined return period” deleted.]

3.3

alert level

condition when certain parameters are below the lower limit, or between limits, or above the upper limit

Note 1 to entry: Alert levels are often colour-coded. The colour-coding will often be green for normal, blue for

advisory, yellow alert for reduced status, and red alert for emergency status. Parameters affecting the change

of colour-coded alert levels can be, for example, approach of limiting metocean conditions, loss of equipment

function, reduced available power levels, offset limits are reached [watch circles (3.17)], excessive vessel motions

are predicted, etc. Actions to be taken can include, for example, discontinue drilling, disconnect riser, suspend

lifts, etc.

3.4

alert level threshold

boundary between alert levels (3.3)

3.5

assessment

site-specific assessment

evaluation of a mobile floating unit and activity specific equipment to determine conformity with

specific requirements

Note 1 to entry: The specific requirements are the requirements of this document (i.e. 19905-3).

Note 2 to entry: Definition derived from ISO 19905-1:2016, 3.4.

3.6

assessment situation

mobile floating unit configuration together with the metocean and ice actions that need to be assessed

3.7

assessor

entity performing the site-specific assessment (3.5)

[SOURCE: ISO 19905-1:2016, 3.6]

3.8

extreme storm event

extreme combination of wind, wave and current conditions used for the assessment (3.5) of the mobile

floating unit

Note 1 to entry: This is the metocean event used for ULS storm assessment and varies depending on what is being

assessed. For example, the metocean event for the ULS assessment of the mooring system can be different from

that used in the ULS assessment of the hull strength or air gap.

3.9

loss of position

unintended move of a dynamically positioned or thruster-assisted vessel from its intended location

[watch circle (3.17)] relative to its set point position (3.13), generally caused by loss of stationkeeping

control or propulsion

Note 1 to entry: Loss of position can take on three main forms drift off, drive off, or force off.

3.10

operating manual

marine operations manual

latest approved document that defines the operational characteristics and capabilities of the mobile

floating unit

[SOURCE: ISO 19905-1:2016, 3.45, modified — “jack-up” has been replaced by “mobile floating unit”,

Note 1 to entry has been deleted, and “manual” replaced by “latest approved document”.]

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