1. A. Perin TE-CRG, 06 April 2009 1 LMC 08 April 2009 Consolidations related to pressure protection on DFBs and DSLs A. Perin, TE-CRG

2. A. Perin TE-CRG, 06 April 2009 2 Pressure relief devices to be installed on DFBs and DSLs EquipmentProtectionRemarks# DFBM (1)1 DN100 + 1 DN200 (link) All DFBMs but DFBMD/H 19 DFBM (2)1 DN100 + 1 DN100 (link) DFBMD / DFBMH 4 DFBL1 DN200 5 DFBA HCM4 DN230 32 DFBA LCM1 DN200 (+ 1 DN200 on link when powering Q6) 12-15 DSL (P1, P5)/ Covered by DFBL and SAM/Semi-SAM / DSLC (P3)3 DN 200 3 L. Tavian

3. A. Perin TE-CRG, 06 April 2009 3 Pressure relief for the DFBM / DFBA LCM links 1 x DN 200 valve on interconnection sleeve relief of DFBM box: 1 x DN100 valve special cases: DFBMH & DFBMD, DFBAD, DFBAC/O Interface to Quadrupole Busbar interconnection 1 x DN200 1 x DN100

4. A. Perin TE-CRG, 06 April 2009 4 Pressure relief device DFBM / DFBA LCM link Hydraulic plug Pipe diam 54 mm Link with spacer Spacers Pipe int diameter 213 mm Cross section of BB duct: 23 cm 2 Cross section of link with spacers: approx. 80 cm 2 MCI: 4.5 K, DP = 1.3 bar, Mass flow (MCI): 10 kg/s @ 4.5 K 1 x DN200 Busbar interconnection

5. A. Perin TE-CRG, 06 April 2009 5 Pressure relief for the DFBM / DFBA LCM links: "standard" and special cases "standard" DFBM link (19) DFBMD/H link (4) DFBAC/O/D links (3+3)

6. A. Perin TE-CRG, 06 April 2009 6 Practical implementation Reuse existing flanges / springs DN 200 : same as the ones installed on the dipoles DN 100 : same as used on the rest of LHC (ISO K + springs) Installation on the link rectangular cut in the interconnecion sleeve saddle "patch" with DN200 port welded onto the interconnection sleeve. Validated on prototype. Helium discharge direction for DN100 on DFBM CL module: horizontal discharge will need a deflector. Installation of elbow is impractical and would require demounting of the service chimney. for DN200: two possibilities (see next slide): short duct with deflector Relief valve installed on link of DFBMM.5L6

7. A. Perin TE-CRG, 06 April 2009 7 Pressure relief for the DFBM / DFBA LCM "standard" links DN200 valve DN100 valve DN200 valve DN100 valve Short duct + deflectorLong duct Deflector for DN100 valve Deflector for DN200 valve Short duct + deflectorLong duct +- Reduced risk of interference with other equipment / survey - applicable with small variants to all DFBMs - better access during welding - no mechanical risk to the link - No need of deflector on DN200 - More defined flow during discharge - Only one item. Cannot be demounted. -- Needs an additional deflector (but can be done later) - flow of helium less controled - deflector can be demounted - possible interference with other equipment. Needs to be checked for each DFBM. Possible variants. (time !!!) - not applicable for DFBMD & DFBMH - reduced access during welding - momentum on link if bad handling Preferred solution

8. A. Perin TE-CRG, 06 April 2009 8 Pressure relief devices for a DFBA 1 x DN100 High current module (HCM) SHM-HCM Interconnection Shuffling module (SHM) Low current module (LCM) HCM - LCM Interconnection 4 x DN230 1 x DN200 Prototype valve under test

9. A. Perin TE-CRG, 06 April 2009 9 Deflectors in front of the relief valves Objective: avoid jet of cold helium below approx. 1.5m from ground 75 mm 400 mm 1500 mm 200 mm With deflector

10. A. Perin TE-CRG, 06 April 2009 10 Work distribution: work on the vacuum tanks for equipment at atm. pressure Equipment atm. pressure ProtectionResponsible of production / installation# in 2009 DFBM + DFBA LCM linkDN100 + DN200 / DN 100 (link) TE-CRG: tunnel operations TE-VSC: springs for DN100 EN-MME: supply of components TE-MSC: DN200 valves 23 (DFBM) 6 (DFBA LCM) DFBL1 x DN200TE-CRG: tunnel operations + logistics TE-VSC: springs for DN200 EN-MME: workshop operation + components TE-MSC: DN200 valves 5 DFBA HCM4 x DN230TE-CRG: tunnel operations EN-MME: workshop machining + supply of all components 32 (8 DFBA) DFBA LCM1 x DN200 on chimneyTE-CRG: tunnel operations TE-VSC: springs for DN200 TE-CRG: tunnel operations + logistics EN-MME (to be confirmed) 6 DSL (P1, P5) magnetCovered by DFBL and SAM/Semi-SAM/ DSLC (P3)3 x DN 200TE-CRG: tunnel operation EN-MME: possible supply of components 3

11. A. Perin TE-CRG, 06 April 2009 11 Work distribution: work on deflectors and supports Equipment at atm. pressure Protection measuresResponsible of production / installation # in 2009 DFBA HCMDeflector for DN230EN-MME8 DFBA LCMDeflector on DN200TE-CRG6 DFBLDeflector for DN200EN-MME5 DFBMDeflector for DN200 Deflector on DN100 TE-CRG29 Equipment under vacuum Protection measuresResponsible of production / installation # in 2009 DFBA HCMReinforcement of supports EN-MME8 DFBA HCMDeflector for Chimney?EN-MME8 DFBA LCMDeflector for DN100TE-CRG6

12. A. Perin TE-CRG, 06 April 2009 12 Estimation of durations for work on cryostats EquipmentProtectionEstimated duration / DFB or DSL# in 2009 DFBM + DFBA LCM linkDN100 + DN200 / DN 100 (link) 0.5 day tunnel operation (confirmed) + production of components 23 (DFBM) 6 (DFBA LCM) DFBL1 x DN2006 days - demounting : 1 day - machining (workshop): 1 day - remounting: 1 day - logistics: 3 days 5 DFBA HCM4 x DN2307 days - demounting : 1 day - machining (workshop): 2 days - remounting: 1 day - logistics: 3 days 32 (8 DFBA) DFBA LCM1 x DN200 on chimney2 days - machining (workshop): 1 day - demounting / remounting: 1 day 6 DSL (P1, P5) magnetn.a./ DSLC (P3)3 x DN 200 10 days3