1. Dielectric Oil Installations
Environmental & FIRE PROTECTION
EDMS No
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2. Summary Dielectric oil systems overview
Major environmental & fire issues
Regulations to be CERN
Actual environmental & fire safety situation
Leak trays inventory in installations and storage
External audit on environmental & fire safety issues
Budget estimates
Conclusion
EDMS No
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3. Dielectric oil systems overview
Use of dielectric oil in HV pulse generators components:
Insulation of HV components
Temperature regulation
Different oil systems types:
Static (basic)
Circulation
Generator switches
Hydraulic units (cooling & oil circulation)
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4. Dielectric oil systems overview
Example of Circulating Oil System:
Safety elements in red color
Vacuum circuit
Building Fire detection
```
Flow switches
HV pulse generator``
Temperature switch
Pressure safety valves
Water cooling circuit
Slave Tank
Oil Pumping unit
Leak tray
Low level switches
Leak tray detector
EDMS No
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5. Dielectric oil systems overview
Some figures:
Near 200m3 of oil
(more than 90m3 in storage)
11 oil installations in CPS
9 oil installations in SPS
4 oil installations in LHC
Details in Edms
3 Dielectric oil types:
Shell DIALA B or S2 mineral oil (O -> fire point <170°C)
Rhodorsil 604V50 silicone oil (K3 -> fire point >300°C)
Midel 7131 synthetic ester oil (K3 -> fire point >300°C)
+ Some unknown oil types in old capacitors & transformers
EDMS No
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6. Major Fire & Environmental issues
Fire issues:
Fire ignition on big volumes of oil in equipment packed areas (up to 10m3)
Check:
Presence of fire detection systems
Mechanical fire protection for leak trays, pipes and cables
Necessity of fire-walls between important oil volumes and cables
Leak, pressure & temperature detection with interlocks
Environmental issues:
Oil spill leading to water pollution or people injury
Check:
Leak tray design (volumes)
Leak trays tightness
Leak , pressure & flow detection systems
Procedures for oil handling & transfer
EDMS No
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7. Regulations to be applied @ CERN
Regulations to be CERN are under study by HSE, in particular for leak trays (ongoing meetings with SIG-Geneva & European firms consultants)
CERN:
SSI-M-2-3: Safety accessories for pressurized vessels (Edms )
C-1-0-1: Storage of hazardous chemical agents (Edms )
Safety Code E: Fire protection (Edms )
European or French:
EN : Power Installations exceeding 1kV
NFC 13100/200: Installations électriques à haute tension
Decret : Loi sur l’eau
Swiss :
CFST 1825: Entreposage et manipulation de liquids inflammables
SN EN : Systèmes de revêtements sur béton
Others:
EDMS No
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8. Actual environmental & fire safety situation
Environmental situation:
Absence of leak trays for equipment , storage or handling
Leak tray tightness uncertainty (sumps, concrete with paint or resin)
Inadequate leak tray sizes: minimum 100% of largest volume or 50% of total volumes for indoor installations if >250l
Vessels & piping are OK on new systems (well defined mechanical CERN)
EDMS No
R. NOULIBOS – 31/05/2016

9. Actual environmental & fire protection situation
Fire detection in buildings
Proximity of Fire Brigade
Ester or Silicone oil are classified K3 (fire point is >300°) reducing safety distances between equipments
Fire protection (-):
Equipment with > 1000 liters of oil are not separated by fire walls (REI 60/90) or sufficient distance (1.5m)
Leak trays without auto-extinguishing systems or detection
Spark detection (pressure switch) in tanks
Uncovered HV cable channels
EDMS No
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10. Leak trays inventory in installations and storage
For 256 leak trays required:
138 leak trays “missing”
75 leak trays with “insufficient capacity”
9 leak trays with “tightness uncertainty”
34 leak trays with “well adapted volume”
Details in Edms
EDMS No
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11. Audit on environmental & fire safety issues
Preliminary audit done by AKHELEC (TE-EPC recommendation) based on EN ; NFC 13100/ décret n° started on CPS systems.
Recommendations for Environmental Protection :
Install metallic leak trays (foldable sides) under equipment (only 2mm clearance under equipment needed)
Remove old resin in concrete leak trays and cover with new resin with glass fiber layers (as PS MTE1 & AD-Elena)
Platforms with false-floors above leak trays least have 1/3 of area covered by grating
Details in Edms
EDMS No
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12. Audit on environmental & fire safety issues
Preliminary audit done by AKHELEC (TE-EPC recommendation) based on EN ; NFC 13100/ décret n° started on CPS systems (continued).
Recommendations for Fire Protection :
Install metallic leak trays with “V” plates under equipment
Platforms with false-floors above leak trays least have 1/3 of area covered by grating
Install removable fire protection panels EI90 (type Promatec 500) betwwen equipment with > 1000 L of oil
Protect valuable HV cable in with EI90 housings
Details in Edms
EDMS No
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13. Budget estimates (for leaktrays only)
---> Details in Edms
EDMS No
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14. Conclusions
In order to reduce fire & environmental risks in oil systems & storage and preserve CERN public image, we should
On short term:
Perform “in depth” audit on installations and storage (external + HSE).
Remove dielectric oil Diala B from installations ASAP ( still 3 systems in CPS).
Continue installation of metallic leak trays (V plates?) under equipment & containers according to budget & resources availability.
Apply safety rules for oil handling & transfer (workers & environment safety).
On long term :
Study repair of concrete leak trays: resin + glass fiber or metallic trays (V plates).
Improve leak and fire detection (instrumentation sensors & switches).
Study protection of valuable equipment & cables with EI90 fire resistant panels.
EDMS No
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15. Thank you for your attention!
Questions?
Thank you for your attention!
EDMS No
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