Associated detection/extinction systems D. Swoboda

14 February 2007 D. LHC safety system review2 Scope  Cold smoke extraction  Flood detection/protection  High expansion foam system  Other fire extinction systems

14 February 2007 D. LHC safety system review3 acknowledgements  High expansion foam system  Courtesy S. Fratianni  Cold smoke extraction  Courtesy B. Pirollet

14 February 2007 D. LHC safety system review4  Concept  UX... experimental caverns.  US... protected areas - technical caverns Cold smoke extraction

14 February 2007 D. LHC safety system review5 Cold smoke extraction Detection All the air handling units of the area concerned are automatically stopped by TS/CV Smoke extraction mode activated by fire men (fire men cubicle) Fire men Air handling units in normal mode restarted by TS/CV End of fire men action During extraction mode extraction filters will be by-passed No action with RP Material designed to 400°C/2h

14 February 2007 D. LHC safety system review6 Cold smoke extraction  Controls status in TI room -start/ stop status of ventilation system controlled by fire men cubicles -status of each air handling unit ( on/off/fault). -status of each external components (dampers).

14 February 2007 D. LHC safety system review7 LHC experimental areas. Cold smoke extraction Experimental cavern; 2 separate & independent areas:  Experimental caverns (UX pts 1/2/8 or UXC55 pt5)  Protected areas- technical caverns (USA 15 pt1 UX 85 pt8 USC55 pt5)

14 February 2007 D. LHC safety system review8 Pt1 Ventilation Principle

14 February 2007 D. LHC safety system review9 Experimental cavern – Pt2 Concrete cap open

14 February 2007 D. LHC safety system review10 Experimental cavern – Pt2 Concrete cap closed

14 February 2007 D. LHC safety system review11 US... - technical caverns. Ventilation Extraction Supply

14 February 2007 D. LHC safety system review12 US...technical caverns. Cold smoke extraction

14 February 2007 D. LHC safety system review13 UAEX 892 UAEX 893 UAPE831 UAPE832 Wall UX85 experimental area UX85 protected area - technical caverns. Cold smoke extraction

14 February 2007 D. LHC safety system review14 Smoke Extraction Capacity PointAreaModePulsionExtraction 1UX 15Normal2x Smoke extraction (*)2x USA 15Normal1x x Smoke extraction1x x UX 25Normal1x Smoke extraction (*)2x UXC 55Normal1x Smoke extraction (*)2x USC 55Normal1x Smoke extraction2x UX 85Normal1x Smoke extraction (*)1x UX 85 PANormal1x Smoke extraction (*)1x x *Extraction gas = smoke extraction

14 February 2007 D. LHC safety system review15 Cold smoke extraction M & O  Included in TS-CV maintenance plan

14 February 2007 D. LHC safety system review16  Each experimental cavern equipped with a sump.  Leak detection sensors and sump pumps installed at low point.  Action:  L2 alarm to 2 nd pump starts  L3 alarm to both pumps at 100% and/or high water level Flood Detection/Protection

14 February 2007 D. LHC safety system review17 Water Evacuation System

14 February 2007 D. LHC safety system review18 Water Evacuation Schematics

14 February 2007 D. LHC safety system review19 Pumping Station Equipment

14 February 2007 D. LHC safety system review20 ATLAS/CMS Foam Injection  TWO main requirements:  1) passive; i.e. no pumps to pressurize the system at the working pressure, no electric components, everything should be manual  Point 1 water is provided by the pumps of the LHC ring, but even without them the 100m pressure head provides enough pressure to run the system  Point 5 equipped with 150 m3 pool for HP foam system & hydrants.  2) static foam blowers = very low maintenance !  no fan turning inside the blowers to generate the foam  Specification to code NFPA11  successfully demonstrated by the commissioning test of CMS UX55 Feb 2006

14 February 2007 D. LHC safety system review21 Foam injection Details  foam loss factor:1.2  foam shrinkage factor:1.4  foam destruction factor:1.2.  expansion rate:≥ 700:1  Fill time:2 + 5 mins.  Static foam generators  Delivery date:≤ Aug Experimental CavernsFree Volume [m3] CMS (UXC5)16500 ATLAS (UX1)18100

14 February 2007 D. LHC safety system review22 Foam system M & O  Weekly inspection  Monthly inspection  Annual maintenance  Manually open/close all valves  Remove & clean filters of the system  Take foam sample and have it analyzed by authorized lab.

14 February 2007 D. LHC safety system review23 ATLAS schematics

14 February 2007 D. LHC safety system review24 CMS HE foam Test Feb 2006

14 February 2007 D. LHC safety system review25 Other fire extinguishing systems  N2+H2O mist high pressure (100 bar)  H2O mist high pressure (70 bar)  N2+H2O mist low pressure (10 bar)  N2 injection  CO2 injection (previous talk)

14 February 2007 D. LHC safety system review26 Other fire extinguishing systems (cnt’d)  CMS, LHCb high pressure N2+H2O control room, PC farms  CMS high pressure H2O counting room false floor, UXC trenches  ATLAS low pressure N2+H2O UG PC farms & false floors  ALICE, CMS N2 injection in detector  Min. 3 volume changes ≥ 5 – 10 mins (O2 ≤ 15 %)  ALICE  120 m3??  CMS  2 x bar

14 February 2007 D. LHC safety system review27 N2-H2O systems operation  activation can be made by:  remote control with solenoid valve by DSS default operation mode  manually using the lever on the top of the gas actuator.  activation by remote control means a detection system sends an activation command to the solenoid valves (24VDC).  For each system both solenoid valves must be activated.  As soon as the solenoid valves are open, the N2 will pressurize the accumulator unit and the gas actuator valve on the other N2 cylinders.  The water mist – nitrogen mixture is discharge into the barrack by a network system.  The system discharge is divided into two phases by a change in the water-nitrogen ratio in the discharge mixture.  The initial phase has a high water-nitrogen ratio.  The second phase has a much lower water-nitrogen ratio and produce a finer airborne mist.  The two phases cannot be strictly separated.

14 February 2007 D. LHC safety system review28 N2-H2O systems M & O  Semi-Annual Inspection  Carry out functional actuation checks.  Replace the actuator valves to the gas cylinder valves.  Visual check the DAU-R units  Re-commissioning the entire system in accordance with the system commissioning procedure.  Annual Inspection  Carry out all the procedure as for the semi-annual inspection.  Change the water inside the accumulator units. Follow the filling procedure. In case the client permit a real discharge test, the N2 cylinders must be also replaced.