Overview of Mechanical Design Nate Laverdure LCLSII 2

Overview of Mechanical Design Nate Laverdure LCLS-II 2 K Cold Box FDR March 9, 2017

Outline Design overview and interfaces Configurations and bayonet installation/removal Design details - Thermal reliefs Cold compressor installation Bellows/straightener assembly Heater assembly Central support column Mechanical drawing package LCLS-II 2 K CBX FDR, Mar 9, 2017 2

Mechanical design overview LCLS-II 2 K CBX FDR, Mar 9, 2017 3

Mechanical design overview LCLS-II 2 K CBX FDR, Mar 9, 2017 4

Cold box configurations High flow configuration (CC-1 through CC-5) From linac To 4 KCB From LHe dewar LCLS-II 2 K CBX FDR, Mar 9, 2017 5

Cold box configurations Low flow configuration (CC-2 through CC-6) To 4 KCB From linac From LHe dewar LCLS-II 2 K CBX FDR, Mar 9, 2017 6

Cold box configurations – u-tubes Configuration U-tubes High flow IBX-CC 1 I-2 KPR-1 CC-1 through CC-5 CC 1 O-CC 2 I-2 KPR-1 Size 9 -1/4” CC 5 O-2 KCB-CCR-1 5 -3/16” 2 KCB-4 KCB-CCR-1 5 -3/16” LHD-2 KCB-4 KVAP-1 3 -1/8” Low flow IBX-CC 2 I-2 KPR-1 CC-2 through CC-6 CC 5 O-CC 6 I-2 KPR-1 9 -1/4” 5 -3/16” 2 KCB-4 KCB-CCR-1 5 -3/16” LHD-2 KCB-4 KVAP-1 3 -1/8” Used in both configurations LCLS-II 2 K CBX FDR, Mar 9, 2017 7

Top plate and work platform Access requirements - Around bayonets for system configuration changes - Around control valves, relief valves, and feedthroughs for maintenance - Sufficient aisle width for egress from work areas LCLS-II 2 K CBX FDR, Mar 9, 2017 8

Cold box configuration control Bayonet installation/removal procedure LCLS-II 2 K CBX FDR, Mar 9, 2017 9

Bayonet installation/removal procedure LCLS-II 2 K CBX FDR, Mar 9, 2017 10

Thermal relief assembly All 2 K Cold Box cryogenic reliefs are: - Thermal reliefs - ASME reliefs - Protected against air contamination via guard vacuum enclosure - Exhausted to header which is protected against moisture entry and vented outdoors LCLS-II 2 K CBX FDR, Mar 9, 2017 11

Thermal relief assembly LCLS-II 2 K CBX FDR, Mar 9, 2017 12

Thermal relief assembly Relief inspection/replacement process: - Warm up 2 K Cold Box and bring to 1 atm Backfill relief exhaust header with 3 atm He purge Break fittings around relief shroud and remove Disconnect relief flange and install blank while under purge Inspect/test relief on bench or replace Disconnect blank and install relief while under purge Re-install relief shroud Pump relief exhaust header to guard vacuum and backfill with 3 atm He purge LCLS-II 2 K CBX FDR, Mar 9, 2017 13

Mechanical details – cold compressor installation LCLS-II 2 K CBX FDR, Mar 9, 2017 14

Mechanical details – bellows/straightener assembly Used in CC-1 and CC-2 inlet piping spools LCLS-II 2 K CBX FDR, Mar 9, 2017 15

Mechanical details – bellows/straightener assembly Cleanup of stagnant annular volume - Recommendation: Large virtual leak exists between flex ID and process piping. Need to address this. - Response: 12 x 1/8” holes to facilitate pump and backfill of annular space LCLS-II 2 K CBX FDR, Mar 9, 2017 16

Mechanical details – heater assembly Based on SNS and earlier heater designs LCLS-II 2 K CBX FDR, Mar 9, 2017 17

Mechanical details – control valves LCLS-II 2 K CBX FDR, Mar 9, 2017 18

Mechanical details – internal piping support Configurable support - Pinned in 2 places for shipping - Pinned in 1 place for normal operation LCLS-II 2 K CBX FDR, Mar 9, 2017 19

Mechanical details – internal piping support LCLS-II 2 K CBX FDR, Mar 9, 2017 20

Mechanical details – manway Based on 30” design used at JLab 4 K Cold Box LCLS-II 2 K CBX FDR, Mar 9, 2017 21

Mechanical details – central support column Maintains flatness of top plate during assembly - Threaded rods and nuts for leveling during installation - Shims inserted between flanges to carry large compression load And during operation - Encased in passive copper conductor - Insulated with MLI - Thermal deflection limited to a few thousandths LCLS-II 2 K CBX FDR, Mar 9, 2017 22

Mechanical details – vacuum pumping system LCLS-II 2 K CBX FDR, Mar 9, 2017 23

Mechanical drawing package structure Final integration - 79222 -0020 top level assembly - Assembled on SLAC site - Includes all installation, outfitting of all external piping and external instrumentation - Responsibility of final construction subcontractor Initial construction - 79222 -0027 top level assembly - Shipped to SLAC - Includes vacuum shell, internal piping, internal instrumentation - Responsibility of initial construction subcontractor LCLS-II 2 K CBX FDR, Mar 9, 2017 24

Mechanical drawing package LCLS-II 2 K CBX FDR, Mar 9, 2017 25

Mechanical drawing package LCLS-II 2 K CBX FDR, Mar 9, 2017 26

Mechanical drawing package LCLS-II 2 K CBX FDR, Mar 9, 2017 27

Mechanical drawing package LCLS-II 2 K CBX FDR, Mar 9, 2017 28

Documentation Document No. 79222 -D 6001 Title 2 K Cold Box Drawing List LCLS-II 2 K CBX FDR, Mar 9, 2017 Author D. Rath Status Under review 29

Summary 2 K Cold Box design documentation - P&ID released - Mechanical drawings for initial construction of the 2 K Cold Box primarily in checking or released - Drawings to be complete by 10 Apr 2017 Access requirements are well defined Maturity of design is commensurate with FDR LCLS-II 2 K CBX FDR, Mar 9, 2017 30

Overview of Mechanical Design Nate Laverdure LCLS-II 2 K Cold Box FDR March 9, 2017

9 -1/4” bayonet interference Background - Used for subatm He connections at CC suction - SNS experience with this component: seized during installation - Outer male bayonet tube observed out-of-round - Interference between OD of outer male bayonet tube and ID of lantern ring or valve flange body - Not observed at JLab LCLS-II 2 K CBX FDR, Mar 9, 2017 32

9 -1/4” bayonet interference Mitigation - Purchase tube meeting ASTM A 269 - From this tubing, select and use only sections meeting additional imposed tolerance - Verify clearance using purpose designed gauge or lantern ring - Inspect ID of all lantern rings and valve flange bodies LCLS-II 2 K CBX FDR, Mar 9, 2017 33