Page 626 - Marine Structural Design

602 Part V Risk Assessment

Fatigue and other human factors such as drinking and driving make great contribution to risks.
Fatigue induced risks become larger when control responsibilities are concentrated in a few
people.
343.4 RCM Proeess - Continuous Improvement of Maintenance Strategy
It can be seen &om the preceding Section that the RCM process is a systematic process used to
make decisions about the maintenance strategy. It is a powerful tool for developing the initial
maintenance strategy by rationalizing maintenance efforts. It should also be used for
continuous improvement of the existing maintenance strategy. In fact, the full benefit of RCM
is achieved when the operation and maintenance experience is fed back into the analysis
process.
The process of updating the RCM analysis results is important due to the following facts:
An RCM analysis is usually based on many assumptions due to lack of reliability data
The operation conditions and equipment status are changing over time
Real reliability data, knowledge, and know - how’s, are growing with time
The maintenance strategy should be updated continuously using RCM processes. The
continuous improvement may follow the steps presented below:
Assign criticality to equipment, components, and failures based on historical data, e.g.
failure consequences, maintenance costs, etc.
Compare the updated criticality with that developed from the early RCM study and update
or replace the assumptions with the historical reliability data
Perform cost-benefit analyses to identify where the modification of the existing
maintenance strategy may increase reliability and reduce the costs
Modify the existing maintenance strategy to increase the cost-effectiveness of the
maintenance strategy

34.4 References

1. EPRI (1 985), “Application of Reliability-Centered Maintenance to Component Cooling
Water System at Turkey Point Units 3 and 4”, EPRI NP-4271, October.
2. Jones, RB. (1995), “Risk-Based Management - A Risk Centered Approach”, Gulf
Publishing Company, Houston.
3. Moubray, J. (1 992), “Reliability Centered Maintenance”, Industrial Press, Inc.
4. MSGl(1968): “747 Maintenance Steering Group Handbook: Maintenance Evaluation
and Program Development (MSG-I)”, Air Transport Association, July.
5. NPD (1991), “Regulations Concerning Implementation and Use of Risk Analysis in the
Petroleum Activities”, Norwegian Petroleum Directorate, 1991.
6. Rausand and Vatn (1 997), “Reliability Centered Maintenance”, NTNU.