1. LS1 SSD PLANS 1.Cooling always on 2.SDD/SSD Cooling plant under UPS 3.Counter flow cleaning 4.Removing Teflon 5.Check safety valves 4 Sept 2012ITS Cooling meetingAvdBrink1

2. COOLING ALWAYS ON To avoid problems such as algae formation, acidification of water and dried dirt after a long stop the system must running al the time. Short stops must be minimized. 4 Sept 2012ITS Cooling meetingAvdBrink2

3. SDD/SSD COOLING PLANT UNDER UPS Why: To avoid any kind of flow problems. Especially after a stop of more then a few hours several ladders get more and more flow problems. What: All the parts to get a controlled flow Remark: To reduce the needed power the SSD heaters will be removed. This also simplifies the PLC program significant 4 Sept 2012ITS Cooling meetingAvdBrink3

4. COUNTER FLOW CLEANING Why: The resistance of the loops are increasing by 10% 4 Sept 2012ITS Cooling meetingAvdBrink4

5. COUNTER FLOW CLEANING A-side: swap red and blue tube together with pressure sensors 4 Sept 2012ITS Cooling meetingAvdBrink5 C-side: swap transparent and blue tube

6. TELFON EN Division-Materials and Metrology CERN/EN/MME-MM/NJ-EDMS 1231362 4 Sept 2012ITS Cooling meetingAvdBrink6 During the examination of the Teflon filter disturbing large particles are found. This problem can be solved by removing all the Teflon in the system!

7. CHECK SAFETY VALVES AND REMOVING TEFLON ? 4 Sept 2012ITS Cooling meetingAvdBrink7 Supply side 64 fittings with Teflon Return side 64 fittings with Teflon 32 safety valves Supply regulator 4 fittings with Teflon