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Condition Based Maintenance (CBM)

CBM survey arrangement is based on predictive maintenance and is an alternative to predetermined (planned) maintenance. With this approach, maintenance is performed according to the condition and not at predetermined intervals or running hours.

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Joar Håland Joar Håland
Principal Engineer, Offshore Classification – In-service Development

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Performing maintenance based only on predetermined intervals or running hours will in many cases result in unnecessary maintenance and can lead to wear out or introduce failures caused by human error. This in turn leads to reduced equipment reliability and increased downtime (out-of-service time). Condition monitoring, diagnostics and prognostics need special competence and continuity in the service.

With the CBM survey arrangement, maintenance is performed according to the condition, as an alternative to predetermined maintenance. The CBM survey arrangement requires tuse of an Approved Service Supplier (AoSS) for CBM. You can open our Approval Finder here. Read more in our rules "DNVGL-RU-OU-0300" available here.  

Survey arrangement CBM: Illustration of a typical model  
Survey arrangement CBM: Illustration of a typical model

The main benefits you will get with Condition Based Maintenance:

By introducing CBM for all or selected failure modes, you can manage maintenance activities based on the equipment's actual condition. This allows better planning and more efficient maintenance (higher availability).

  • Cost-efficient maintenance - reducing out-of-service time
  • Application of sensor data for equipment monitoring, diagnostics and prognostics
  • Optimized maintenance through a combination of predetermined and predictive maintenance