1. CV maintenance works during YETS 2017-2018
S. Deleval

2. Content Cooling annual maintenance for SF, SU, UW Constraints
Surface annual maintenance
Resources
Plan
Conclusion

3. Reminder SF
SU or SUX
UW, USA or USC

4. SF: cooling towers

5. SU / SUX: chilled and mixed water production

6. UW: Sectors +TI + RF + Experiments

7. Coolig: annual maintenance works
Complete drainage of primary circuits
Mechanical cleaning of cooling towers
Check of safety relief valves
Filters cleaning
Oil replacement (pumps, gear boxes, ..)
Greasing
Check of motors, pumps, valves, actuators, sensors, air vents,..
Replacement of ions exchangers and regeneration of resins
Check of control and power cubicles
Control updates, bugs fixing
Repairs / replacement of broken components

8. Example: cleaning filters

9. Constraints
Drainage of primary circuits cannot be done locally. Water must be rejected in Switzerland through the reject loop.
Filling must be done with the raw water loops.
For closed circuits: water has to be recuperated and or rejected in the waste water circuit.
Several services have to keep running during maintenance

10. Surface ventilation
255 air handling units to maintain (only surfaces units)
Filters check / replacement
Belts replacement
Greasing
Check of motors, fans, valves, actuators, sensors, coils,..
Check of control and power cubicles
Control updates, bugs fixing
Repairs / replacement of broken components

11. Resources 5 staffs for LHC 2 maintenance contractors
1 water treatment contactor
Resources needed from other services: HE, EL, DGS-RP, BE-ICS, SMB
Work during closure and several Saturdays
Work in parallel
YETS
YETS
With cryo running

12. Maintenance re-organised
First two weeks
First two weeks

13. Plan All resource can’t work at the same time in the SF (coactivity)
Maintenance
Reduction
Mitigation
Drainage and mechanical cleaning of cooling towers No
Check of safety relief valves
Oil replacement (pumps, gear boxes, ..), greasing
Check of motors, pumps
Valves
Yes
Valves for cryo and general process
Actuators
Actuators for regulation
Sensors
Sensors for regulation and interlocks
Check of control and power cubicles, control updates, bugs fixing
Repairs / replacement of broken components

14. Conclusion
Reduction of maintenance will concern the SF in the last two points that will be planned. SU and UW will undergo the standard maintenance. Risk to affect the reliability is very hard to evaluate. Mitigation by maintaining the most important components.

15. Thank you for your attention

16. SF cooling plants 2 first weeks 2 first weeks 2 first weeks

17. 2 first weeks + cryo cooling plant in US
UW: cooling plants
2 first weeks + cryo cooling plant in US