2. Activities of the ME section during LS2 (2019-2021)
Preventive & corrective maintenance
Consolidations
Projects
Conclusion

3. Mechanical Maintenance
Compressors
Oil Pumps
Filters (gas, oil, coalescers, separators, adsorbers)
Heat exchangers
Valves, safety valves, bursting disks
Vacuum components (pumps & valves)
Requalification of pressurized equipment by AET (80 P8)
General mechanical support to other preventive tasks (Cold CP, MAPAG, motors, pressure tests, …) and corrective activities (CB repair, valves repair, …) Inventory and resource to be consolidated
Managed by CRG-ME, with CRG-ME and S176 resource
Managed by CRG-ML and S176.
Less resource from CRG-ME
Managed by ME with OP
Managed by OP/ML/CE.
No input now. Heavy impact on CRG-ME resource

4. Compressors : preventive maintenance
Based on last year measured operation hours
Spares are used as buffer
Major overhauling of all CPs were performed in less than 1 year at the LS1 with a planning based on batch / installation
Final assessment -> maintenance windows needed from OP
Coherent strategy with motors ? -> OMP

5. Oil pumps : maintenance / consolidations
LS2 maintenance
Preventive maintenance for oil pumps (various PMs @ 8’000 / 24’000 / 40’000 h) -> S176
Pumps with shaft seal issues (KRAL, Allweiller) -> upgrade/consolidations to new pumps with magnetic coupling
-> VFD from CRG-CE
Coherent strategy with motors ? -> OMP
LS2 consolidations :
LHC KRAL : replacement with magnetic coupling + VFD
LHC IMO pumps : improvement of support (#14/15)
LHC DESMI pump : final consolidation
ATLAS SR : upgrade of one oil pump (magnetic coupling)
ATLAS MR CP6 : replace centrifugal oil pump by volumetric one ?
Impact on ME resource:
Relatively low

6. LS2 consolidations Impact on ME resource: Low
High
Medium
Medium/High
High - TBD
TBD
Additional oil fine filters in // of the present oil pump filter (QSCA-4/6, QSCB, QSCC-Mayekawa)
QSCA : elastomer under concrete blocks (# 32 skids)
QSDH-18 (and QSDH-4 ?) (TBC) :
Swap of supply TLs CV061 to CV062
Removal of air HX and new return to LP TL
QUI : purge collectors, instrum (TT, 600 kW, …)
QUI : additional DN250 «MAPAG» valves ?
By-Pass QUI lineD/LineD and/or QSRa-b return line D ?
Sectorization valve outlet turbines TU2&4 on QSRA-4/6
1 or 2 QRL compensators ?
QRL valves ? QSV valves ?
QSCA-2 new compressors ?
Oil cleaning LHCA P4/P6 adsorbers and HX and/or other LHC ORS consolidation ?
ATLAS ? CMS ? LHC tunnel ?

7. Main projects during LS2
Impact on ME resource:
High
Low
Medium/High
Medium
TBD
LHC sector pressure tests
QRL access platform modification in RH87. (Others ?)
SM18: new liquefactor & cryo infrastructure
B163/B165 upgrade
AD cryoline
LHC P4 upgrade
«Orphan» projects :
TCF-20 and cryoplants for QSDH
Isolde LN2 shield system
North Area consolidations ?

8. Projects

9. CRG-ME LS2 activities conclusion
Preventive maintenance :
Strategy to be validated (OMP)
Maintenance plans to be reviewed and assessed (ME/ML- OMP)
LS2 maintenance windows
In order to define and assess the necessary CRG-ME resources, more details are needed for the maintenance (support and corrective), and from the consolidations and projects