r.becker (mit) 15/10/02 ugbs main plate patrick schmid (left) of ethz did the cnc machining of the...

R.Becker (MIT) 15/10/02

UGBS Main Plate

Patrick Schmid (left) of ETHZ did the CNC machining of the plate.

Urs Horisberger (ETHZ) Completed follow up machining


UGBS Plate Machining

• Back (top) & Front (right) sides of plate


UGBS Subassemblies


UGBS Plumbing Model

• Model was made to:

• perform a Fit check of the subassemblies

• Weld the whole system

• Test the valves & system


MV197 Bracket


MV197 Bracket Tube welding

• The full assembly looks like this • Easier to look at half! The welding procedure will look at only half since the other side is mirror symmetrical


2 Step Construction

• First the “U” (welding steps 1,2,3) are welded not mounted in the bracket.

• Then the xv254 and the filter are mounted and welded (steps 4-6)

• The GP50 is installed and all remaining welds performed.

• The welded components are now removed to allow for the welding of the MV197 valves

• The MV197’s are installed and secured as shown

• The “U” (steps 1,2) is pre-welded and then welded to the valves (steps 3,4)

• the 1/4”-1/8” reducers are pre-welded to the T-junctions and then welded to the valves (steps 7,8)

• The “U’ is then welded (steps 9,10)

• The “U” to the xv234is then welded per step 11.

Step 1 Step 2


Step 3

• The Step 1 components are then mounted and welded (It may be more practical that all 4 mv197 are mounted before installing the pre-welded pressure and filter units)

• Perform same steps for mirror side

• Note also, all 1/8” tubes going to the buffer volumes or otherwise (NOT SHOWN -but at the ends of all 1/4-18” reduction pieces) need to be pre-welded -the welding head will not fit later.


4 Valve Bracket Welding Sequence

• Follow sequence as shown

• Welds 1 & 5 need attention since they may need to be done first


4 Valve Bracket


2 Valve Bracket


2Valve Bracket Welding Sequence

• Welding follows the sequence above.

• Step (12)* is welded after inserting the filter into the bracket.

• Weld 4 in the 2nd step should be performed after the oriface/filter unit is loosely fitted into the bracket

• After welding is copleted RTV is injected in the Filter cavity

Step 1 (Oriface/Filter Unit)

Step 2 (valves)

2 valve bracket Completed


Venting Valve Bracket


TRD Gas System Mechanics StatusR.Becker (MIT) October 30, 2002

Radiator not shown

• UGBS design done, commercial version being assembled

• Flight main plate ordered, & most flight brackets manufactured

• UGBS kit including welding procedures being prepared for ARDE

• UGBC design needs to be finalized

• UGBC to TRD manifold plumbing & bracketry designs needed


UGBC (Circulation System)

Status:• Sealed cylindrical container design

feasible– CERN welding experts state that

such a cylinder can be welded cleanly.

• Rough mechanical design done (Right)

– components arranged within boundaries (wasn’t easy)

– 4-valve bracket adapted from UGBS

• Detailed design foreseen by early December

r.becker (mit) 15/10/02 ugbs main plate patrick schmid (left) of ethz did the cnc machining of the...

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