Asset Register

A physical item of plant, equipment, or infrastructure that has value to an organization and is subject to management decisions regarding its acquisition, operation, maintenance, modification, and disposal. In asset integrity management, assets include pressure vessels, piping systems, storage tanks, rotating equipment, structural components, electrical equipment, and instrumentation systems. Each asset has an identity, a defined function, and documented attributes.

A structured, multi-level organization of assets that reflects the functional and physical relationships between equipment items, from the site level down to maintainable components. A typical hierarchy follows: Site > Plant > Unit > System > Equipment > Component. Asset hierarchies enable roll-up of reliability data, cost allocation, and maintenance planning at different organizational levels.

The assignment of a criticality ranking (typically A, B, or C) to each equipment item based on the consequences of its failure across safety, environmental, production, and maintenance cost dimensions. Criticality classification determines the level of engineering attention, inspection rigor, maintenance strategy, and spare parts investment appropriate for each asset.

Asset Management standard — provides an overview, principles, and terminology for the management of physical assets. It establishes that asset management is a coordinated activity to realize value from assets, balancing cost, risk, opportunity, and performance over the entire lifecycle. ISO 55001 specifies requirements for an asset management system.