scope:

This NORSOK standard is applicable for preparation and optimisation of maintenance activities for all plant systems and items.

The consequence classification and the maintenance task selection process can be applied to all types of items, and, in principle, all types of failure modes and failure mechanisms are covered by this NORSOK standard. However, for some types of items, other specific analysis should be performed to identify failure characteristics, failure frequencies and mitigating tasks. This include, among others, load bearing structures, static pressure equipment, risers and pipelines.

This standard is developed with the oil and gas industry in mind, but the principles within can be applied to any industry, including manufacturing or processing plants, ships/maritime and energy plants/installations.

This NORSOK standard covers

• definition of relevant nomenclature,

• brief description of main work flow related to maintenance and which elements this typically involves,

• definition of risk model and failure consequence classes,

• guidelines for consequence classification, including

− functional breakdown of plants and plant systems in MFs and sub functions,

− identification of MF and sub function redundancy,

− assessment of the consequences of loss of MFs and sub functions,

− assignment of equipment to sub functions and associated consequence classes,

• description of how to establish an initial maintenance programme, and how to update an existing programme,

• description on how to use the classification in combination with probability for decision making related to prioritising work orders and handling spare parts.