SIST EN ISO 19901-1:2026
(Main)Specific requirements for offshore structures - Part 1: Metocean design and operating considerations (ISO 19901-1:2026)
General Information
- Abstract
This document provides two broad types of requirements for the determination and use of meteorological and oceanographic (metocean) conditions for the design, construction and operation of offshore structures:
those related to the determination of environmental conditions in general, together with the metocean parameters that are required to adequately describe them;
those related to the characterization and use of metocean parameters for the design, the construction activities or the operation of offshore structures.
This document covers the following environmental conditions and metocean parameters:
extreme and abnormal values of metocean parameters that recur with given return periods that are considerably longer than the design service life of the structure;
long-term distributions of metocean parameters in the form of cumulative, conditional, marginal or joint statistics of metocean parameters;
normal environmental conditions that are expected to occur frequently during the design service life of the structure.
Metocean parameters specified in this document are applicable to:
the determination of actions for the design of new structures;
the determination of actions for the assessment of existing structures;
the site-specific assessment of mobile offshore units;
the determination of limiting environmental conditions, weather windows, actions and action effects for pre-service and post-service situations (i.e. fabrication, transportation and installation or decommissioning and removal of a structure);
the operation of the platform, where appropriate.
It is beyond the scope of this document to provide detailed instructions that can be followed to produce reliable estimates of extreme or abnormal conditions in all areas and in all cases.
- Status
- Published
- Public Enquiry End Date
- 30-Oct-2024
- Publication Date
- 07-Sep-2026
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 27-Aug-2026
- Due Date
- 01-Nov-2026
- Completion Date
- 08-Sep-2026
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Overview
SIST EN ISO 19901-1:2026 sets out specific requirements for the consideration of meteorological and oceanographic (metocean) conditions in the design, construction, and ongoing operation of offshore structures, particularly in oil, gas, and low-carbon energy sectors. Developed by the Slovenian Institute for Standardization (SIST) and aligned with ISO 19901-1:2026, this standard provides clear guidance on the identification, analysis, and application of metocean parameters relevant to offshore projects worldwide. The standard is instrumental in promoting structural integrity, safety, and operational efficiency by ensuring that offshore assets are engineered to withstand environmental conditions.
Key Topics
- Determination of Environmental Conditions: Establishes procedures for assessing metocean parameters such as wind, waves, currents, tides, and storm surges.
- Metocean Data Collection: Outlines best practices for collecting reliable meteorological and oceanographic data to inform engineering decisions.
- Extreme and Abnormal Events: Offers methodologies for evaluating rare but critical environmental events that could surpass the operational or design life of offshore structures.
- Statistical Approaches: Encourages using cumulative, conditional, marginal, or joint statistics for accurately modeling long-term environmental conditions.
- Parameter Application: Describes how to utilize metocean data in design actions, assessments, and site-specific evaluations for both new and existing offshore infrastructure.
- Operational Windows: Supports determining limiting environmental conditions ("weather windows") crucial for safe fabrication, transport, installation, decommissioning, or removal processes.
- Expert Involvement: Emphasizes the role of experienced metocean professionals in interpreting environmental data, given the variability of global offshore environments.
- Quality and Verification: Recommends procedures for the validation of weather forecasts and ongoing monitoring, ensuring continuous operational safety and reliability.
Applications
SIST EN ISO 19901-1:2026 is essential for a variety of offshore engineering and operational activities, such as:
- Design of New Offshore Structures: Ensures platforms, rigs, and other installations are engineered to resist extreme metocean conditions over their lifespan.
- Assessment of Existing Structures: Provides criteria for evaluating environmental loads and potential impacts on structures in service.
- Mobile Offshore Units: Facilitates site-specific assessments for mobile and temporary installations, including jack-ups and floating units.
- Operational Planning: Guides the determination of safe operational limits and scheduling for activities like transport, installation, maintenance, and removal based on forecasted conditions.
- Risk Management: Aids in identifying vulnerabilities related to abnormal events, helping operators mitigate risks through informed design and operational decisions.
- Regulatory Compliance: Supports adherence to national and international regulations by providing a unified approach to environmental assessment in offshore contexts.
Related Standards
Organizations involved in offshore design, construction, and operation often reference the following standards alongside SIST EN ISO 19901-1:2026:
- ISO 19900: General requirements for offshore structures.
- ISO 19902: Fixed steel offshore structures.
- ISO 19903: Concrete offshore structures.
- ISO 19904-1: Floating offshore structures, including ship-shaped and cylindrical units.
- ISO 19905-1: Site-specific assessment of jack-ups.
- ISO 19906: Arctic offshore structures.
- WMO-No 306: Manual on meteorological codes.
By integrating SIST EN ISO 19901-1:2026 with these related standards, stakeholders can achieve a comprehensive, harmonized framework for the metocean design and ongoing management of offshore assets, ensuring resilience and regulatory alignment.
Keywords: metocean design, offshore structures, environmental conditions, ISO 19901-1, oil and gas, wind, waves, currents, tides, weather windows, operational safety, structural integrity, offshore engineering standards, risk management.
Relations
- Effective Date
- 25-Aug-2026
- Effective Date
- 19-Jan-2023
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Frequently Asked Questions
SIST EN ISO 19901-1:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Specific requirements for offshore structures - Part 1: Metocean design and operating considerations (ISO 19901-1:2026)". This standard covers: This document provides two broad types of requirements for the determination and use of meteorological and oceanographic (metocean) conditions for the design, construction and operation of offshore structures: those related to the determination of environmental conditions in general, together with the metocean parameters that are required to adequately describe them; those related to the characterization and use of metocean parameters for the design, the construction activities or the operation of offshore structures. This document covers the following environmental conditions and metocean parameters: extreme and abnormal values of metocean parameters that recur with given return periods that are considerably longer than the design service life of the structure; long-term distributions of metocean parameters in the form of cumulative, conditional, marginal or joint statistics of metocean parameters; normal environmental conditions that are expected to occur frequently during the design service life of the structure. Metocean parameters specified in this document are applicable to: the determination of actions for the design of new structures; the determination of actions for the assessment of existing structures; the site-specific assessment of mobile offshore units; the determination of limiting environmental conditions, weather windows, actions and action effects for pre-service and post-service situations (i.e. fabrication, transportation and installation or decommissioning and removal of a structure); the operation of the platform, where appropriate. It is beyond the scope of this document to provide detailed instructions that can be followed to produce reliable estimates of extreme or abnormal conditions in all areas and in all cases.
This document provides two broad types of requirements for the determination and use of meteorological and oceanographic (metocean) conditions for the design, construction and operation of offshore structures: those related to the determination of environmental conditions in general, together with the metocean parameters that are required to adequately describe them; those related to the characterization and use of metocean parameters for the design, the construction activities or the operation of offshore structures. This document covers the following environmental conditions and metocean parameters: extreme and abnormal values of metocean parameters that recur with given return periods that are considerably longer than the design service life of the structure; long-term distributions of metocean parameters in the form of cumulative, conditional, marginal or joint statistics of metocean parameters; normal environmental conditions that are expected to occur frequently during the design service life of the structure. Metocean parameters specified in this document are applicable to: the determination of actions for the design of new structures; the determination of actions for the assessment of existing structures; the site-specific assessment of mobile offshore units; the determination of limiting environmental conditions, weather windows, actions and action effects for pre-service and post-service situations (i.e. fabrication, transportation and installation or decommissioning and removal of a structure); the operation of the platform, where appropriate. It is beyond the scope of this document to provide detailed instructions that can be followed to produce reliable estimates of extreme or abnormal conditions in all areas and in all cases.
SIST EN ISO 19901-1:2026 is classified under the following ICS (International Classification for Standards) categories: 75.180.10 - Exploratory, drilling and extraction equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 19901-1:2026 has the following relationships with other standards: It is inter standard links to SIST EN IEC 61400-3-2:2025, SIST EN ISO 19901-1:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN ISO 19901-1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2026
Posebne zahteve za naftne ploščadi - 1. del: Določila za načrtovanje in obratovanje
ob upoštevanju oceanografskih in meteoroloških vidikov (ISO 19901-1:2026)
Specific requirements for offshore structures - Part 1: Metocean design and operating
considerations (ISO 19901-1:2026)
Öl- und Gasindustrie einschließlich kohlenstoffarmer Energieträger - Spezielle
Anforderungen für Offshore-Anlagen - Teil 1: Grundsätze für die Auslegung und den
Betrieb auf dem offenen Meer (ISO 19901-1:2026)
Exigences spécifiques relatives aux structures en mer - Partie 1: Dispositions océano-
météorologiques pour la conception et l'exploitation (ISO 19901-1:2026)
Ta slovenski standard je istoveten z: EN ISO 19901-1:2026
ICS:
75.180.10 Oprema za raziskovanje, Exploratory, drilling and
vrtanje in odkopavanje extraction equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 19901-1
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2026
EUROPÄISCHE NORM
ICS 75.180.10 Supersedes EN ISO 19901-1:2015
English Version
Specific requirements for offshore structures - Part 1:
Metocean design and operating considerations (ISO
19901-1:2026)
Exigences spécifiques relatives aux structures en mer - Öl- und Gasindustrie einschließlich kohlenstoffarmer
Partie 1: Dispositions océano-météorologiques pour la Energieträger - Spezielle Anforderungen für Offshore-
conception et l'exploitation (ISO 19901-1:2026) Anlagen - Teil 1: Grundsätze für die Auslegung und den
Betrieb auf dem offenen Meer (ISO 19901-1:2026)
This European Standard was approved by CEN on 10 July 2026.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland,
...