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

A. Perin TE-CRG, 06 April 2009 2

Pressure relief devices to be installed on DFBs and DSLs

Equipment Protection Remarks #

DFBM (1) 1 DN100 + 1 DN200 (link) All DFBMs but DFBMD/H  19

DFBM (2) 1 DN100 + 1 DN100 (link) DFBMD / DFBMH 4

DFBL 1 DN200   5

DFBA HCM 4 DN230   32

DFBA LCM 1 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

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

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

Spacers

Pipe int diameter 213 mmCross section of BB duct: 23 cm2

Cross section of link with spacers: approx. 80 cm2

MCI: 4.5 K, DP = 1.3 bar, Mass flow (MCI): 10 kg/s @ 4.5 K

1 x DN200

Busbar interconnection

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)

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

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 + deflector Long duct

Deflector for DN100 valve Deflector for

DN100 valve

Deflector for DN200 valve

Short duct + deflector Long 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

A. Perin TE-CRG, 06 April 2009 8

Pressure relief devices for a DFBA

1 x DN100 High current module (HCM)

SHM-HCMInterconnectionShuffling module (SHM)

Low current module (LCM)

HCM - LCMInterconnection

4 x DN230

1 x DN200

Prototype valve under test

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

A. Perin TE-CRG, 06 April 2009 10

Work distribution: work on the vacuum tanks for equipment at atm. pressure

Equipmentatm. pressure

Protection Responsible of production / installation # in 2009

DFBM + DFBA LCM link DN100 + DN200 / DN 100 (link)

TE-CRG: tunnel operationsTE-VSC: springs for DN100EN-MME: supply of componentsTE-MSC: DN200 valves

23 (DFBM)6 (DFBA LCM)

DFBL 1 x DN200 TE-CRG: tunnel operations + logisticsTE-VSC: springs for DN200EN-MME: workshop operation + componentsTE-MSC: DN200 valves

5

DFBA HCM 4 x DN230 TE-CRG: tunnel operationsEN-MME: workshop machining + supply of all components

32 (8 DFBA)

DFBA LCM 1 x DN200 on chimney TE-CRG: tunnel operationsTE-VSC: springs for DN200TE-CRG: tunnel operations + logisticsEN-MME (to be confirmed)

6

DSL (P1, P5) magnet Covered by DFBL and SAM/Semi-SAM /

DSLC (P3) 3 x DN 200 TE-CRG: tunnel operation EN-MME: possible supply of components

3

A. Perin TE-CRG, 06 April 2009 11

Work distribution: work on deflectors and supports

Equipment at atm. pressure

Protection measures Responsible of production / installation

# in 2009

DFBA HCM Deflector for DN230 EN-MME 8

DFBA LCM Deflector on DN200 TE-CRG 6

DFBL Deflector for DN200 EN-MME 5

DFBM Deflector for DN200Deflector on DN100

TE-CRG 29

Equipment under vacuum

Protection measures Responsible of production / installation

# in 2009

DFBA HCM Reinforcement of supports

EN-MME 8

DFBA HCM Deflector for Chimney? EN-MME 8

DFBA LCM Deflector for DN100 TE-CRG 6

A. Perin TE-CRG, 06 April 2009 12

Estimation of durations for work on cryostats

Equipment Protection Estimated duration / DFB or DSL # in 2009

DFBM + DFBA LCM link DN100 + DN200 / DN 100 (link)

0.5 day tunnel operation (confirmed)+ production of components

23 (DFBM)6 (DFBA LCM)

DFBL 1 x DN200 6 days - demounting : 1 day- machining (workshop): 1 day- remounting: 1 day- logistics: 3 days

5

DFBA HCM 4 x DN230 7 days - demounting : 1 day- machining (workshop): 2 days- remounting: 1 day- logistics: 3 days

32 (8 DFBA)

DFBA LCM 1 x DN200 on chimney 2 days- machining (workshop): 1 day- demounting / remounting: 1 day

6

DSL (P1, P5) magnet n.a. /

DSLC (P3) 3 x DN 200 10 days 3