1. David Mcfarlane1 CMS Gas Systems (Nitrogen, Argon & CO2)

2. David Mcfarlane2 Overview Different types Uses Layout of individual systems Consumption figures so far Operational troubling shooting Final Comments

3. David Mcfarlane3 Different types Experimental gases –Experimental gases required for specific experiments. Experimental primary gases –Nitrogen –Argon –CO2 Flushing gases (Permanent inertion) –Nitrogen Fire Suppression gases (Temporary inertion) –Nitrogen Compressed air system –Nothing to do with this group!!!!!!!!

4. David Mcfarlane4 Experimental gases SF6, CF4, C2H2F4, Ar/H2 & I-C4H10 These gases are used by RPC, CSC, DT and TOTEM. Supplied from the SGX5 gas building. –Via the USC55 gas room into the UXC55 cavern

5. David Mcfarlane5 Experimental Primary gases Argon, CO2 & Nitrogen. To be used by the detectors groups for use directly related to the operation of the detectors themselves and operation of control racks. –Eg, Argon is used as part of the mixture of the CSC system –Eg, Nitrogen is used to operate pneumatic valves within the control racks. Supplied from the SGX5 building. Stored in bottles, batteries (Argon has a dewar) This system is controlled and operated by TS/LEA

6. David Mcfarlane6 Primary gas layout

7. David Mcfarlane7 Current Consumption figures (2007)

8. David Mcfarlane8 Flushing gases (permanent inertion) Nitrogen. Used by several experiments to flush areas between detectors to insure an inert,dry and helium free atmosphere is maintained. –Eg, Tracker. Supplied from a 50m3 dewar located just outside SDX5. The Dewar is controlled and operated by AT. This system is controlled and operated by CMS.

9. David Mcfarlane9 Flushing gas layout

10. David Mcfarlane10 Fire Suppression gases (Temporary inertion) Nitrogen. Used only in the event of a fire being detected inside the detector. Supplied from 2 tanks located just outside the SGX5 building. This system is controlled and operated by PH.

11. David Mcfarlane11 Fire Suppression layout

12. David Mcfarlane12 Operational troubling shooting No piquet is forseen from TS/LEA Who to contact? –TS/LEA – Mats Wilhelmsson –CMS –Christoph Schäfer/ Gerd Fetchenhauer –AT – Goran Perinic –PH – Stefan Haider / Mar Capeans Possible failure areas? –Unreported increases in consumption

13. David Mcfarlane13 Final comments The 3 Nitrogen systems are completely separate. They are supplied from different sources Different people are responsible for different systems DO NOT “MIX & MATCH!!!!!” If the experimental Nitrogen system fails, then all of the detector control racks will stop working!!! Before using any of these systems, make sure you inform the correct operator of your estimated consumption and flow rate figures.