1. CAVLAR ® Ilse Pieterse-Quirijns

2. 400 mm NGIJ Valve failure III 500 mm GGIJ Valve failure II 300 mm GGIJ Known valve failure Mains replacement Failure of valves: – I (known): 2 extra valves, no extra customers – II: 4 extra valves plus extra customers – III: 5 extra valves plus extra customers Valves can fail

3. CAVLAR ® Quantifying the contribution of valves (or the fialure of valves) to the supply of drinking water

4. CAVLAR ® CAVLAR ® : Criticality Analysis Valve Locations And Reliability Location valves: section analysis of distribution network Reliability of valves: calculate performance distribution net critical sections critical valves Effect of valve maintenance: improvement valve reliability improvement of performance distribution net 1 2 3

5. CAVLAR ® : required input Required information: LIS data: Failure data: Maintenance data: Volendam number of connections, length, diameter failure probability supply interruption durance valve reliability

6. Insight in existing distribution net 0 50 100 150 200 012345678910 Number of sections Number of valves per section 0 50 100 150 200 0100200300400500600 Connections per section Number of sections 0.001 0.01 0.1 1 10 100 1000 0100200300400500600 Volume per section (m3) Number of sections

7. Location of valves Section: number of connections diameter length failure probability Valve: Reliability Section diagram

8. Adjust valve configuration

9. Adjust valve configuration (2)

10. New valve locations: comparison of configurations Original configuration New configuration less dependent sections new config.: less valves in a section 50% of valves more connections in a section norm Groningen:< 200 33% of sections

11. Reliability of valves: critical sections (1) For each section CAVLAR ® calculates performance indicators at a certain valve reliability: Impact : number of connections Ratio : impact/number of connections in section CML (min/section/year): minutes that costumer does not have water CI (1/year): customer interruptions highest CML critical sections

12. Performance indicator: Impact Ratio CI CML critical section critical valves Reliability of valves: critical sections (2)

13. 159 conn. 3 valves I = 181 Ratio = 1.138 CML = 06:54:08 CI = 0.042 vave rel.=0.90 Critical section 1: A_123Y Reliability of valves: critical sections (3)

14. Reliability of valves: critical sections (4) First 10 (5%) sections: 24% of total CML First 22 (10%) sections: 40 % of total CML

15. Reliability of valves: critical sections (5) Judge new valve configuration based on CML number of valvesreliabilitynumber of sectionsCML [min] original configuration7120.905555:01 new configuration3330.9018311:56 new configuration + maintenance 3330.951839:42 x 0.5x 0.33x 2.3 CML improvement : 18.7% weight reduction operational costs and CML increase optimalisation valve configuration

16. Influence of increased valve reliability 0:00:00 0:07:12 0:14:24 0:21:36 0:28:48 0:36:00 0:43:12 0:50:24 0.70.80.850.90.950.981 valve reliability [-] CML [min/conn./year] original configuration new configuration

17. Effect of valve maintenance: Judge maintenance scenarios Maintenance of valves: increase of valve reliability 0.90 0.95 effect maintenance for Winschoten: improvement CML with 18.7% CAVLAR ® determines prioritization of valves (ranking valves with diminishing effect on performance of distribution net) input for maintenance scenarios

18. Effect of maintenance on CML maintain 50% of most critical valves 75% of max. possible result same effect with maintenance of 22% of most critical valves to higher reliability btbh 0.95 btbh 0.98 willekeurig naar 0.95

19. Conclusion Roll of CAVLAR ® : tool for optimisation of distribution network tool for prioritisation of sections and valves tool for advise in maintenance plans 1 2 3 Smart maintenance:good maintenance of critical valves results in same performance Smart configuration:judgement and optimisation of valve configuration