Progress on Overpressure Relief including triplets, feedboxes and special magnets
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Progress on Overpressure Relief including triplets, feedboxes and special magnets
L. TavianLHC risk review, 5 March 2009
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Content
• Basic assumptions• Protection of inner triplets (IT)• Protection of standalone (SAM), Semi-SAM
and their current feed boxes (DFBM, DFBL)• Protection of Arc current feed boxes (DFBA)• Protection of SC link at P3 (DSLC)• Summary
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Basic assumption: He inventoryEquipment He inventory
[kg] Remark
Standard subsector 820Mid arc subsector 1230DS subsector 680Standalone magnet ~30 Directly connected to Line D (+ 180 kg)Semi-standalone magnet ~60 Directly connected to Line D (+ 180 kg)Inner triplet 150 - 180 Depending on SC D1Current feed box X 30Current feed box M & L 4 - 7Current feed box A 13 - 23 Directly connected to DS subsector Superconducting link (P3) 260 Directly connected to Line C (+3400 kg)Superconducting link (P1, P5) 25 Directly connected to Line C (+3400 kg)
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Basic assumption: He discharge T
• Stored energy in main buses: 1200 MJ He discharge temperature: ~ 80 K
• Stored energy in IT: 8.8 MJStored energy in SAM: 1-7 MJ a factor ~ 140 w/r to main buses lower He discharge temperature: ~ 10-20 K
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SV discharge capability
0
2
4
6
8
10
12
14
16
18
20
1 10 100
Mas
s-flo
w [k
g/s]
He discharge temperature [K]
DN200DN160DN100DN63
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IT MCI mass flowI nner Triplet - MCI s
• Bus fault rupturing interconnect bellows:- Up to 20 kg/ s helium fl ow into cryostat.- Cryostat pressurized to many bar, similar to 19 Sep event.- Anchors to floor will break
for P > 1.5~2 bar.- Superconducting D1 could also
be pushed off its stands. - DFBX (square cryostat) could
be severely damaged by internal pressure. No spare DFBX* => 1-2 years to build new f rom scratch.
• I nter-turn short puncturing/ rupturing cold bore tube.- Scaling f rom a similar incident with an SSC R&D magnet, such an
event could create a 20-30 mm diameter hole in the beam tube.- Up to 10 kg/ s high pressure helium released into vacuum tube,
adjacent to experiments, in presence of electrical arc.* There are 8 DFBX of 6 variants
LHC Performance Workshop - 2009 J. Strait 21
J. Strait
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Protection of Inner TripletSlice type
S He m MCI T He Vacuum
He inventory
Stored energy
Vacuum volume Vac buffering
[cm2] [kg/s] [K] [kg] [MJ] [m3] [Inv. %] [s]Q-Q 1 60 20 10-20 180 8.8 15 20 1.8Q-DFBX 2 30 10 10-20 180 8.8 15 20 3.6DFBX 3 30 10 10 30 8.8 15 100 3.0D1-DFBX 4 30 10 10-20 180 1 15 20 3.6
With acceptable cryostat hydraulic
impedance
Too high cryostat hydraulic
impedance
DN200 DN200 DN200
DN200DN200DN200
D1 Q3 Q2AQ2B Q1
D1 Q3 Q2AQ2B Q1DFBX
DFBX 11
24
3
11
24
3
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Positions of the safety valves (1/2)Longitudinally:
Radial:
On Q3:• DN 200 on top or bottom
In the interconnects:• DN 200 on top, bottom or enlarging the existing safety valve
On DFBX:• DN 160 on the dished cover
H. Prin
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IT Protection recommendation
• Installation of the SV at the bottom of the cryostat. minimize the work load (5 to 3 days per IT) but require specific flow deflector to protect personnel and the QRL equipment in carbon steel
• The cryostat hydraulic impedance and the MLI blanket resistance still to be confirmed. doubling of the SV can solve the problem
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SAM protectionSlice type
S He m MCI T He Vacuum
He inventory
Stored energy
Vacuum volume Vac buffering
[cm2] [kg/s] [K] [kg] [MJ] [m3] [Inv. %] [s]SAM-DFBM 1 23 8 10-20 30 2 4 32 1.3DFBM 2 8 3 10 4 2 4 100 1.5
DN200 2 DN160or DN200
SAM
DFBM 12
DN100DN200 2 DN160or DN200
SAM
DFBM 12
Variant A: 1 DN200 onDFBM service chimney
Variant B: 1 DN200 onInterconnect sleeve
(Existing)
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SAM protection
27 cryo-magnets already need to be equipped with DN160 ports (He level capillary consolidation)
21 cryo-magnets needs port manufacturing : -2 DN160 ports per magnet- or 1 DN200 port per magnet
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Pressure relief for the DFBM
Variant A:1 valve DN200
Variant B:1 valve DN200
Interface to Quadrupole
Busbar interconnection
A. Perin
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Semi-SAM protectionSlice type
S He m MCI T He Vacuum
He inventory
Stored energy
Vacuum volume Vac buffering
[cm2] [kg/s] [K] [kg] [MJ] [m3] [Inv. %] [s]M-M 1 46 15 10-20 60 3 4 16 0.6M-DFBM 2 23 8 10-20 60 3 4 16 1.3DFBM 3 8 3 10 4 2 4 100 1.5
DN100 2 DN160or DN200
2 DN160or DN200
DFBMQ or D Q or D
123
DN200
2 DN160or DN200
2 DN160or DN200
DFBMQ or D Q or D
123
DN200
Variant A: 1 DN200 onDFBM service chimney
Variant B: 1 DN200 onInterconnect sleeve
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SAM / Semi-SAM / DSL protectionSlice type
S He m MCI T He Vacuum
He inventory
Stored energy
Vacuum volume Vac buffering
[cm2] [kg/s] [K] [kg] [MJ] [m3] [Inv. %] [s]M-M 1 46 15 10-20 60 3 17 68 2.7SSAM-DSL (HeI) 2 23 8 10-20 60 3 17 68 5.3SAM-DSL (HeI) 3 23 8 10-20 30 2 17 100 3.9SAM-DSL (SHe) 4 24 8 10-20 25 2 17 100 3.1DSL-DFBL (SHe) 5 24 8 10-20 25 7 17 100 3.1DFBL 6 8 3 10-20 7 7 17 100 2.6
DN2002 DN160or DN200
2 DN160or DN200
2 DN160or DN200
2 DN160or DN200
DFBL
DSL
SAMSAM Q or DQ or D13
6
3 24
5
44
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Pressure relief for the DSLs of IR 1 & 5: connections to magnets
Busbar interconnections
DN2002 DN160or DN200
2 DN160or DN200
2 DN160or DN200
2 DN160or DN200
DFBL
DSL
SAMSAM Q or DQ or D13
6
3 24
5
44
• pressure relief done through magnets
A. Perin
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DFBLbolted door
4 x 120A CL 8 x 120A CL11 x 6 kA CL
interface toSC link
interface to QRL
Pressure relief for the DFBLs
1 valve DN200
• 1 x DN200 valve
• installed on interface box cover• work in tunnel: remove cover, reinstall coverA. Perin
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DFBA protectionSlice type S He m MCI T He Vacuum He inventory Stored
energy Vacuum volume Vac buffering[cm2] [kg/s] [K] [kg] [MJ] [m3] [Inv. %] [s]
M-M 1 120 40 80 680 1200 67 6 1.0M-DFBA 2 60 20 80 680 1200 67 6 2.0DFBA (HeII) 3 60 20 80 680 1200 67 6 2.0DFBA (HeI) 4 24 8 80 13 1200 67 100 1.6HCM-LCM (HeI) 5 20 7 10-20 10 1 68 100 1.5LCM (HeI) 6 8 3 10 10 1 68 100 3.8LCM-Q6 7 23 8 10-20 10 1.5 72 100 1.3
2 DN100 DN200
2 DN100 DN2002 DN160
Q D
DFBAHCM
DFBALCM
Q D
DFBAHCM
DFBALCM
Q6
123456
12345
6
7
4 DN230
DN100
DN200DN200
4 DN230
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DFBA-HCM protection
75 mm
400 mm
1600 mm
100 mm – 150 mm
Ø3800 tunnel: interference between deflector and transport passage
A. Perin
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DFBLC-DSLC protectionSlice type
S He m MCI T He Vacuum
He inventory
Stored energy
Vacuum volume Vac buffering
[cm2] [kg/s] [K] [kg] [MJ] [m3] [Inv. %] [s]DSLC-DFB 5 20 7 10-20 260 1 15 29 11.1DSLC 6 40 13 10-20 260 1 15 29 5.6DFBLC 7 8 3 10-20 7 1 15 100 2.6
2 DN100 DN200
DN200
DN200DN200
DFBLC DSLCDFBAF
HCM
Q D123
4
55 6 67
DN200
4 DN230
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Summary• IT (8 units) 24 to 48 DN200 (depending on cryostat hydraulic impedance)• SAM & semi-SAM 48 magnets
– 27 to be equipped with 2 x DN160 on existing holes – 21 to be equipped with 2 x DN160 or 1 x DN200 – Remark: consolidation of two Q6 not possible during this SD
• DFBM 23 DN200 on service chimney or link• DFBL 5 DN200 on the end cover• DFBA HCM: 64 DN230 on access doors
LCM: 3 DN200 on service chimney– Remark: Consolidation of 8 DFBA not possible during this SD
• DSLC 3 DN200 on interconnect sleeves• Total for LSS ~200 to 250 relief valves (depending on open choices)
– Remark: 38 SV installation not possible with the present SD scenario: Mitigation measures under study for the protection of equipment (8 DFBA + 2 SAM) during the next run.