EN ISO 19901-6:2009 PDF

Overview

EN ISO 19901-6:2009 (ISO 19901-6:2009) is the international standard that provides requirements and guidance for the planning and engineering of marine operations for offshore structures. It covers the design, analysis and procedural controls for components, systems, equipment and methods required to carry out marine activities safely for a wide range of offshore units - from steel and concrete gravity-base structures (GBS) to floating production systems (FPS, FPSO, FPSS), TLPs, semisubmersibles, MOUs, mooring systems and anchors. The standard also applies to modifications of existing structures (for example, adding topside modules). It excludes onshore fabrication, routine in-service marine activities, drilling, pipeline/riser installation and diving operations.

Key Topics and Technical Requirements

The standard addresses practical and technical aspects of marine operations, including:

• Organization, documentation and planning: roles, communication, QA, technical procedures and certification requirements.
• HSE and risk management: hazard identification, job safety analysis, incident reporting and personnel tracking.
• Metocean and earthquake criteria: weather-restricted vs. unrestricted operations, metocean forecasts and weather windows.
• Weight control and stability: weight classes, centre-of-gravity (CoG) constraints, stability calculations (intact and damage conditions), inclining tests.
• Ballasting systems: ballast system design, control/indication, pumps, valves, venting and prevention of progressive flooding.
• Loadout and transportation: categories of loadout, barge and quay considerations, link beams/skidways, float-on/float-off operations, tugs, multi-barge transport and sea fastenings.
• Moorings and anchors: design and associated mooring system checks relevant to marine operations.
• Testing, audits and documentation: pre-operation testing, weight/stability audits and required manuals.

Practical Applications - Who Uses It

This standard is essential for professionals involved in offshore marine projects:

• Offshore project and marine engineers (planning lift, loadout, transport and installation);
• Naval architects (stability, float-off and transport analysis);
• Marine contractors, towage and barge operators (operational procedures and safety);
• HSE managers and risk assessors (job safety analysis, incident reporting);
• Regulatory and certification bodies ensuring compliance for installation and modification activities;
• Owners/operators managing modifications or topside installations.

Use cases include planning installation of topsides, barge float-offs, heavy-lift transport, ballasting operations, and module integration/modification campaigns.

Related Standards

• Part of the ISO 19901 series on offshore structures; adopted as EN ISO 19901-6 by CEN members (including SIST in Slovenia).
• Typically used alongside other ISO and national standards governing offshore design, metocean data and marine equipment certification.

Keywords: EN ISO 19901-6:2009, ISO 19901-6:2009, marine operations standard, offshore structures, loadout, ballasting, stability, metocean, marine planning.