EN ISO 19901-1:2015 PDF

Overview

EN ISO 19901-1:2015 (ISO 19901-1:2015) - "Petroleum and natural gas industries - Specific requirements for offshore structures - Part 1: Metocean design and operating considerations" - defines general requirements for determining and using meteorological and oceanographic (metocean) conditions in the design, construction and operation of offshore structures. The standard sets expectations for characterizing environmental loading (wind, waves, currents, tides, storm surge and other factors) through extreme, long‑term statistical and frequent (normal) conditions to establish consistent design and operational criteria for offshore platforms, mobile units and related activities.

Key Topics and Technical Requirements

• Metocean parameter identification: selection of parameters required to describe site environmental conditions (directionality, storm types, spectra).
• Extreme and abnormal conditions: guidance on defining extreme events with long return periods and extrapolation methods to determine design extremes.
• Statistical characterization: use of long‑term distributions (cumulative, conditional, marginal, joint statistics) for design and fatigue analyses.
• Normal and operational conditions: definition of frequently occurring environmental states for routine operations and habitability.
• Specific environmental factors: wind profiles and spectra, wave spectra and kinematics, current velocities and profiles, tides and storm surges, sea ice, icebergs, tsunamis, seiches, marine growth and ice accretion.
• Applications to lifecycle stages: parameters for design of new structures, assessment of existing structures, site‑specific assessment of mobile offshore units, and environmental limits for fabrication, transportation, installation, decommissioning and operation.
• Data collection and instrumentation: requirements for metocean data gathering, quality assurance, and reporting (including meteorological and oceanographic observations, and weather reporting for helicopter and forecasting services).
• Activity‑specific guidance: metocean criteria for short‑, medium‑ and long‑term activities and for fatigue and extreme loading assessments.

Practical Applications - Who Uses This Standard

• Offshore structural and marine engineers establishing design environmental loads.
• Metocean analysts and oceanographers developing site‑specific environmental databases.
• Project managers, contractors and EPCI teams planning installation, transportation and decommissioning (defining weather windows and limiting conditions).
• Asset integrity and inspection teams assessing existing platforms and planning maintenance.
• Regulators and operators setting operational limits, safety cases and emergency response criteria.
• Naval architects and designers of floating and fixed offshore units, including mobile offshore units and platforms.

Related Standards

• ISO 19905‑1 - site‑specific assessment of jack‑ups
• ISO 19906 - arctic offshore structures (sea ice/icebergs)
• ISO 19901‑3 - topside structures considerations

Keywords: ISO 19901-1, EN ISO 19901-1:2015, metocean, offshore structures, petroleum and natural gas, metocean design, wind waves currents, environmental design criteria.