Risk Based Maintenance (RBM)

Risk-Based Maintenance (RBM) assesses the amount of risk to equipment according to the likelihood of damage and the possible consequences of failure. The consequence of failure may be calculated in terms of financial loss, repair costs, human injury and environmental damage.


Advantage of RBM:

• Save on maintenance cost
• Improves plant availability
• Accurate estimation of residual life
• Prioritize urgency of maintenance

1. Diagnosis Plan:
   
   The diagnosis plan is based on the determination of parts and the area & methods of inspection.
   
   They are determined according to the operation and structure data, past inspection data and failure history.



2. Inspection Method:
   
   

   
   

   Babcock-Hitachi utilized advanced inspection methods such as:
   
   
   1. Replica Method, Electronic Focus Sector Scan Ultrasonic Testing (ELFOSS-UT)
   
   
   2. Corrosion Fatigue Defect Detecting Device
   
   
   3. Steam Oxidation Scale Thickness Measuring Device
   
   
   4. Advanced Tube Internal Ultrasonic Testing (ADIN-UT)
   
   
   5. Coil Deep Space Inspection Device
   
   
   
   
3. Inspection Results Evaluation:
   
   

   
   

   Inspection results are evaluated, based on the 'RISK' calculated from the 'Likelihood of Damage' and the 'Possible Consequences of Failure'.
   
   RISK = LIKELIHOOD x CONSEQUENCE
   
   The evaluation is conducted using RBM methodology, which is a product of Babcock-Hitachi's years of experience in the boiler business.
   
   A long-term maintenance plan is produced to provide the customer with timing for replacement and inspection according to the evaluated risks.