M00000785
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ISO 19901-7 2nd Edition, May 1, 2013 Petroleum and natural gas industries - Specific requirements for offshore structures - Part 7: Stationkeeping systems for floating offshore structures and mobile offshore units
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 19901 specifies methodologies for
a) the design, analysis and evaluation of stationkeeping systems
for floating structures used by the oil and gas industries to
support
1) production,
2) storage,
3) drilling, well intervention and production,
4) production and storage,
5) drilling, well intervention, production and storage, and
b) the assessment of stationkeeping systems for site-specific
applications of mobile offshore units (e.g. mobile offshore
drilling units, construction units, and pipelay units).
Most stationkeeping systems used with the class of floating
structures covered by a) are termed "permanent mooring systems",
for which this part of ISO 19901 is applicable to all aspects of
the life cycle and includes requirements relating to the
manufacture of mooring components, as well as considerations for
in-service inspections. Most stationkeeping systems used with
mobile offshore units, the class covered by b), are termed "mobile
mooring systems". Throughout this part of ISO 19901, the term
"floating structure", sometimes shortened to "structure", is used
as a generic term to indicate any member of the two classes,a) and
b).
This part of ISO 19901 is applicable to the following types of
stationkeeping systems, which are either covered directly in this
part of ISO 19901 or through reference to other guidelines:
— spread moorings (catenary, taut-line and semi-taut-line
moorings);
— single point moorings, anchored by spread mooring
arrangements;
— dynamic positioning systems;
— thruster-assisted moorings. Descriptions of the
characteristics and of typical components of these systems are
given in Annex A.
The requirements of this part of ISO 19901 mainly address spread
mooring systems and single point mooring systems with mooring lines
composed of steel chain and wire rope. This part of ISO 19901 also
provides guidance on the application of the methodology to
synthetic fibre rope mooring systems, and includes additional
requirements related to the unique properties of synthetic fibre
ropes.
This part of ISO 19901 is applicable to single anchor leg
moorings (SALMs) and other single point mooring systems (e.g. tower
soft yoke systems) only to the extent to which the requirements are
relevant.
This part of ISO 19901 is not applicable to the vertical
moorings of tension leg platforms (TLPs).
The methodology described in this part of ISO 19901 identifies a
set of coherent analysis tools that, combined with an understanding
of the site-specific metocean conditions, the characteristics of
the floating structure under consideration, and other factors, can
be used to determine the adequacy of the stationkeeping system to
meet the functional requirements of this part of ISO 19901.
NOTE For moorings deployed in ice-prone environments, additional
requirements are given in ISO 19906.