cryo piping & inter-module connections yun he, daniel sabol, joe conway external review of mlc...

Daniel Sabol, MLC External Review

CRYO PIPING & INTER-MODULE CONNECTIONS

Yun He, Daniel Sabol, Joe Conway

External Review of MLC

10/3/2012

2

2K supply Sub-cooled liquid @1.2 bar

40K supply Gas @ 20 bar

HGRP1.8K Gas

2K

10/3/2012 Daniel Sabol, MLC External Review

Cryogenic Piping Layout

40K Shield Gas @ 20 bar

4.5K SupplyLiquid @ 3 bar

6K ReturnGas @ 3 bar

80K ReturnGas @ 20 bar

2K-2Phase

Precool Liquid @ 1.2 bar

5K Forward

40K Local

3Daniel Sabol, MLC External Review

5K Fixed Supports

Fixed pipe supports will be used near the valves for the 2K, 4.5K and 6K pipes. We will use tabs welded to HGRP, G-10 brackets and SS retainers tack welded to the 50 mm pipes. Pressure is 3 bar. HGRP will move 7.5 mm relative to valves.

SS retainers welded

10/3/2012

HGRP


40/80K Support Structure

The 40K & 80K pipes will be anchored to the radiation shield on the valve end. Substantial force will be transmitted to the 40K shield (1560 lbs.) by each line due to the 20 bar internal pressure. Forces may tend to balance until the end modules. We have not analyzed the structure yet. Thoughts?

Fixed pipe anchors

10/3/2012

Pipes will move 15.5 mm relative to the valves


Cryogenic Valve Connections

10/3/2012

JT

PC

40K

5K

40K

5KPCJT

Axial displacement of ports relative to valves (Fixed center post to fixed valve location)

HGRP (4K) 7.5 mm

40K Shield 15.5 mm

• The jumpers between the valves and various pipes will need bellows or loops to accommodate the thermal contraction (final version not shown).

• All orbital welded connections.


Cryogenic Valves & Connections

Cryogenic Valves: (4) Weka bellows sealed valves and positioners per

module. 10 mm bore, 10 mm travel. 600 mm length. Available 10 or 25 bar models. Heat leak .28 watts with thermal intercept (300 – 4k). Shown with 90 degree orbital weld elbow. ~ $9k each.

10/3/2012

Transitions: Explosion bonded transitions used for the 40K

shield (Al – SS) & HOM’s (Ti – SS).


50mm Bellows

The 50mm (pipe ends) x ~355mm (14”) bellows will have a single braid shield to handle the 20 bar pressure and will be compressed warm ~ 32mm for the SS lines and 35mm for the Al extrusion line to compensate for contraction when cooled. We have added a inner tube on the bellows to eliminate vibrations. Should we be considering alternate bellows designs (external tube retainer, no braid, pre-pipe fixed point offsets)

Components Material Temperature ∆L/L ∆L Bellows

HGRP Ti 300K-2K 0.172% 17 mm Ti

2K,5K, 40K SS 300K-2K 0.319% 31.5 mm SS

40K extrusion AL 6063 300K-40K 0.350% 34.5 mm SS, SS-AL transition

Axial displacement due to thermal contractions of materials when cooled

10/3/2012

5K & Precool Jumpers

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5K jumper connects cooling of two ends of HOM absorbers and the coupler for each cavity 6 mm

LHe vessel pre-cool lines 6 mm

Local precool 20 mm

Local 5K supply 12.7 mm



Inter-module connections

• 270 mm TI HGRP - Field hand weld• (6) 50 mm SS pipes – Use fixture to align, hand

tack and orbital weld. Bellows will be pre-compressed.

• Beam line vacuum connection will use portable clean room.

• Bolted (one side) radiation shield insert, CM shield needs to extend beyond flanges on each end.

• Should all joints be aligned on one plane?

10/3/2012


Inter-module Connections

Inter-module connection point

10/3/2012

Space allowed for orbital weld head.

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Interconnection module &Beamline interconnection

Interconnection Module

Beamline Interconnection


HGRP Connection

12

Interconnection Module &Beamline Interconnection

Port for gate valve

Port for access to tuner

Pump-out portw/ RF screen of “shower drain” hole patterns

Flexible joint with RF shielding

Flexible section for making connection of two modules

Will be locked after connection is made Should we allow for expansion?

(vacuum incident when cold)


cryo piping & inter-module connections yun he, daniel sabol, joe conway external review of mlc...

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