Inventure Generic Storage Tank Rbi Presentation


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Inventure Generic Storage Tank Rbi Presentation

  1. 1. <ul><li>To set in place, and implement, the systems and processes to assure ongoing availability of storage tanks, without compromising Technical Integrity and HSE. </li></ul>Integrity Management Objectives
  2. 2. Storage tank RBI <ul><li>EEMUA 159 </li></ul><ul><li>API 581 Appendix O </li></ul><ul><li>Inspection plans </li></ul>
  3. 3. Storage tank RBI: goals <ul><li>Meet requirements from legislation </li></ul><ul><li>Cover risks that can be foreseen </li></ul><ul><li>Evaluate and improve operational maintenance plans </li></ul><ul><li>Reduce direct and indirect costs (consequences) of ineffective maintenance </li></ul><ul><li>Provide evidence for “good ownership” </li></ul>
  4. 4. Tank Maintenance Plan Tank Maintenance Plan Maintenance history Inventure best practice Norms and guidelines Inspection techniques Input client Inspection history Repairs and modifications Condition assesment and failures Availability Cleaning procedures NDT On stream methods Clustering Methodologies API 581, EEMUA 159, API 653
  5. 5. Closing the loop Maintenance RBI-based Maintenance planning Repair procedures RBI-based maintenance plan RBI re-evaluation Plan Do Check Act
  6. 6. Tank fixed inspection intervals years Cleaning Inspection Maintenance Production loss costs
  7. 7. Tank flexible inspection intervals years Cleaning Inspection Maintenance Production loss costs
  8. 8. API 581 appendix O <ul><li>Specifically developed for storage tanks </li></ul><ul><li>Statistical background </li></ul><ul><li>Very comprehensive </li></ul><ul><li>Worldwide accepted </li></ul><ul><li>Follows the API 653 </li></ul>
  9. 9. Statistical background API 581 Leak Rupture
  10. 10. Api 581: Leak and rupture scenarios
  11. 11. Api 581: Acceptable damage factor
  12. 12. Api 581: Status of tank Damage factor now Damage factor can grow to 630. The ar/t can grow to 0,88
  13. 13. Api 581: most important parameters <ul><li>Risk category </li></ul><ul><li>FFP acceptable wallthickness </li></ul><ul><li>Degradation mechanisms </li></ul><ul><li>Inspection rating </li></ul><ul><li>Product leakage scenario </li></ul><ul><li>Repair plan tankfloor </li></ul><ul><li>Coating tankfloor </li></ul><ul><li>Acceptable damage factor </li></ul>
  14. 14. Api 581: Risk matrix tank X A D C E 1 2 3 1000 5 4 B 100 20 2 Likelihood (Damage Factor) Likelihood (category) Consequence (category) Consequence ($) $10K $100K $1M $10M Low Risk Medium-High Risk High Risk Medium Risk
  15. 15. Api 581: Damage factors
  16. 16. EEMUA 159: example tankfloor <ul><li>Tank 44 </li></ul><ul><li>built in 1986 </li></ul><ul><li>56 meter diameter </li></ul><ul><li>Product is crude </li></ul><ul><li>Floor new 7 mm, annular 12 mm </li></ul><ul><li>One inspection from 1996, dataset with UT wallthickness measurements </li></ul><ul><li>Last inspection in 2006, new dataset with UT wallthickness measurements </li></ul><ul><li>An RBI analysis is carried out </li></ul>
  17. 17. EEMUA 159: example tankfloor <ul><li>Characteristics: </li></ul><ul><li>Risk analysis is carried out </li></ul><ul><li>In statistical analysis UT datasets extreme value fit is used. Corrosion rate is calculated </li></ul><ul><li>Fitness for service criteria are being established </li></ul><ul><li>Based on remaining lifetime calculation and criticality factor an inspection interval is determined </li></ul><ul><li>Based on the analysis a maintenance plan is made to maintain the integrity such that the inspection interval is 15 years </li></ul><ul><li>1) Guidelines for use of statistics for analysis of sample inspection of corrosion, HSE 2002 </li></ul><ul><li>2) Kowaka M: ‘Introduction to life prediction of industrial plant materials – application of extreme value </li></ul><ul><li>statistical method for corrosion analysis’. Allerton Press Inc, New York, 1994, </li></ul>
  18. 18. EEMUA 159: UT datasets tankfloor
  19. 19. EEMUA 159: RBI results tankfloor <ul><li>Corrosion rate 0,125 mm/year </li></ul><ul><li>Remaining life: 17 years </li></ul><ul><li>Rejection limit (fitness for purpose): 2,5 mm </li></ul><ul><li>Probability rating: Negligible </li></ul><ul><li>Consequence rating: High </li></ul><ul><li>Overall risk rating: Medium </li></ul><ul><li>Next inspection in years: 10; yr. 2016 </li></ul>
  20. 20. EEMUA 159: Handling the results Client wants to close the tank for 15 years, however the inspection term from the EEMUA RBI study is 10 years. Solution: weld patch plates on all areas with a wallthickness lower than 4,9 mm.
  21. 21. Added Value <ul><li>Regular ‘ health checks’ undertaken and documented </li></ul><ul><li>Strategies aligned to Client business drivers </li></ul><ul><li>Safe operation </li></ul><ul><li>Optimised inspection costs </li></ul><ul><li>Higher up time </li></ul><ul><li>Avoidance of losses to the environment </li></ul>
  22. 22. Zijn er nog vragen?