scope:

This NORSOK standard is applicable for preparation and optimisation of maintenance programs for plant systems and equipment including:

• Offshore topside systems.

• Sub-sea production systems.

• Oil and gas terminals.

The systems involving the following types of equipment:

• Mechanical equipment.

• Static and rotating equipment.

• Instrumentation

• Electrical equipment. Excluded from the scope of this NORSOK standard are:

• Load bearing structures.

• Floating structures.

• Risers and pipelines.

In principle, all types of fault modes and failure mechanisms are covered by this NORSOK standard.

This NORSOK standard covers:

• Definition of relevant nomenclature.

• Guidelines for criticality analysis, including:

• Functional breakdown of plants and plant systems in main functions and sub functions.

• Identification of main function and sub function redundancy.

• Definition of failure consequence classes.

• Assessment of the consequences of loss of main functions and sub functions.

• Assignment of equipment to sub functions and associated consequence classes.

Examples of application of the functional breakdown and the criticality analysis:

• Selection of equipment where preventive maintenance activities can be based on generic maintenance concepts.

• Selection of equipment where detailed RCM (FMECA) analysis is recommended.

• Establishment of maintenance activities and intervals, specification of resource and competence requirements, and evaluation of shutdown requirements.

• Preparation and optimisation of generic maintenance concepts.

• Design evaluations.

• Prioritisation of work orders.

• Spare part evaluations.