Z-008 Risk based maintenance and consequence classification (Rev. 3, June 2011)

This NORSOK standard is applicable for preparation and optimisation of maintenance activities 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;
• piping;
• 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 failure modes and failure mechanisms are covered by this NORSOK standard.

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.

Additional requirements: ConocoPhillips (Consequence Analysis for Maintenance Purposes) ConocoPhillips (PM Program Development and Spare Parts Evaluation)