SIST EN ISO 19901-5:2022 PDF

Overview

SIST EN ISO 19901-5:2022 (ISO 19901-5:2021) specifies requirements for weight management and control of the centre of gravity (CoG) for offshore petroleum and natural gas facilities. The standard applies to fixed and floating offshore structures (greenfield and brownfield) across all lifecycle phases: conceptual design, FEED, detail engineering, construction, installation, operations, decommissioning and removal. It focuses on static mass items and supports structural integrity management (SIM). Snow and ice loads are excluded; dynamic loads are covered by related ISO documents.

Key technical topics and requirements

• Principles of mass management: systematic control of weights and CoG from early design through decommissioning.
• Control weights: definitions and use of budget weights, not-to-exceed (NTE) weights, and reserves to support design and procurement decisions.
• Weight estimating and reporting: standardized terminology, estimation principles, and deliverables for consistent weight data.
• Weight management planning: requirements for a weight management plan, procedures, reporting formats and verification processes during FEED, detail engineering and construction.
• Weighing and verification: requirements for weighing tagged equipment, discipline bulks, assemblies, modules and entire facilities, including procedures and acceptable weighing devices and calibration practices.
• Weight databases and legacy data: guidance for maintaining, updating and using weight databases for design, construction and operations.
• Interface management: controlling weight and CoG at discipline and module interfaces to avoid adverse effects on global stability and structural integrity.
• Operational controls: ongoing weight management during operations and decommissioning to maintain SIM and safe load conditions.

Practical applications and who uses it

This standard is a practical reference for organizations responsible for offshore project delivery and asset integrity:

• Offshore structural, marine and mechanical engineers managing stability and load envelopes.
• Project and construction managers planning logistics, lift campaigns, and installation strategies.
• FEED/detail engineering teams preparing weight estimates, NTE limits and budget weights.
• Fabrication yards, module suppliers and contractors providing validated weight data and performing weigh-ins.
• Asset operators and integrity teams maintaining weight databases for operations, modifications and decommissioning.
• Cost estimators and schedulers using weight data to inform costing, method selection and site planning.

Related standards

• ISO 19904‑1, ISO 19901‑6 and ISO 19901‑7 (dynamic loads and other loading considerations) - referenced for dynamic load treatment and complementary requirements.
• Use SIST EN ISO 19901-5:2022 as a contract reference, for weight management planning, and to refine structural models and SIM.