Island in maintenance strategy

Transcription

1 Island in maintenance strategy Siebe Rooseboom de Vries, Tengfei Sun, Sander Smit, Anouk Dijkman /01/2018 1

2 Why is this case study performed? The energy transition Lack of space to build wind farms closer to shore 31/01/2018 2

3 Animation of the vision of Tennet 31/01/2018 3

4 The North Sea Wind Power Hub Doggerbank, North Sea Artificial island 30 GW wind farm 30 clusters of 1 GW, consisting of MW turbines 27 sub transformer stations around the island Estimated investment costs for wind farm: 70,5 billion euro 31/01/2018 4

5 Maintenance Equipment Transportation Access systems Rope Access Heavy lifting Safety 31/01/2018 5

6 Transportation CTV 20 kn crew 2m & 15 m/s SOV 15 kn crew 3m & 17 m/s Helicopter 120 km/h 6 crew 20 m/s 31/01/2018 6

7 Access systems Helideck Tower access Gangways (Motion compensated) Rope access 31/01/2018 7

8 The jack-up vessel 31/01/2018 8

9 Maintenance visions Corrective Run to failure Maximum lifetime usage Preventive Inspect, Detect, React Higher costs and maint. hours Predictive Experience / Testing Data storage Strategic Opportunity based Correlation 31/01/2018 9

10 Offshore wind farm maintenance Scheduled maintenance Inspection Components replacement Minor repair Unscheduled maintenance Major replacement Major repair Minor repair Remotely repair 31/01/

11 Offshore wind farm maintenance Scheduled maintenance Once per year 3 technicians work onsite for 2 days (12-14 hours) No crane or heavy equipment need Scheduled maintenance yearly Daily Technicians Down time (hour) 108, Crane 0 0 Heavy equipment /01/

12 Offshore wind farm maintenance Unscheduled maintenance is not ideal, it will increase Loss of production Logistic cost Spare part inventory Number of vessel & equipment Number of technician 31/01/

13 Simulation model Input Output Failure rate per failure category for offshore wind turbine Whether data Equipment specification Technician salary information Number of defect in failure category Total downtime Number of technician needed Logistics distance 31/01/

14 Simulation model 31/01/

15 Simulation model Unscheduled maintenance Theoretical (Yearly) Simulated (Yearly) Simulated (Daily) Major replacement Major repair Minor repair Non-cost repair Technicians Repair time (hour) Crane Heavy components /01/

16 Simulation model Logistic distance Total logistic distance year KM daily logistic distance KM average logistic distance KM Chance of defect at same cluster 3% Logistics time (One way) CTV-small (Minutes) CTV-large (minutes) SOV (Minutes) Crane (Minutes) 60 helichopter (minutes) prepair time crane (minutes) 83 prepair time (minutes) 30 31/01/

17 Simulated strategy Use mature technology and equipment Keep redundant equipment as less as possible 24/7 always ready technician team High flexibility for further development 31/01/

18 Simulated strategy More vs less Trade-off Crew numbers reduced downtime (hour/day) energy profit/year (million Euro) cost/year (million Euro) net profit (million Euro) Crane CTV-small CTV-XL SOV Helichopter /01/

19 Simulated strategy Just enough Strategy 31/01/

20 Simulation model Minimum number of equipment require Crane Heavy components vessels The number of defect can a vessel Amoun Availabili handle per day t ty CTV-small 4 53% CTV-large 5 53% SOV 10 75% Helicopter 15 93% Crane 1 75% 31/01/

21 Simulated strategy Just enough Strategy Equipment Amount remarks Crew numbers scheduled maintenance. 480 unscheduled maintenance. Crane CTV-small CTV-XL SOV Helicopter 3 One additional crane is advised 7 53% of the unscheduled maintenance workload 5 3 for 22% unscheduled maintenance work. 2 for 100% of scheduled maintenance work. 1 18% of the unscheduled workload 1 The rest unscheduled maintenance work 31/01/

22 Simulated strategy Just enough Strategy Maximum profit High availability Low maintenance cost High flexibility Equipment Total million Euro Total personal cost million euro Total material cost per year Total maintenance cost per year Million Euro Million Euro 31/01/

23 Defining the best maintenance strategy(1) The Just enough strategy The bigger is better strategy The small and quick strategy The high tech strategy 31/01/

24 Simulated strategy (just enough strategy) The Just enough strategy The bigger is better strategy The small and quick strategy The high tech strategy 31/01/

25 Defining the best maintenance strategy(2) Criteria Weight factor 1. Just Enough 2. Bigger is 3. Small and 4. High tech Better Quick Scaling 1 and up 1 to 5 1 to 5 1 to 5 1 to 5 Logistic hours 1, Logistic availability 1, Total downtime 1, Technical difficulty Technicians required Crew comfort Environment 1, Initial investment Safety 1, Total score Total score including wf 25 36,8 35,8 41,3 31/01/

26 The high tech strategy Logistics Inspection & repair Condition monitoring (Big Data) The island 31/01/

27 Conclusion 31/01/