sct hex prr (13-4-05)
DESCRIPTION
SCT HEX PRR (13-4-05). Layout & Installation of Barrel off-detector HEX circuits From barrel cooling loop to PPB1 Barrel Hex is a plain (non-coiled inlet tube) layout, 1.5m active length - PowerPoint PPT PresentationTRANSCRIPT
CLRC 1A.Nichols
SCT HEX PRR (13-4-05)
Layout & Installation of Barrel off-detector HEX circuitsFrom barrel cooling loop to PPB1
Barrel Hex is a plain (non-coiled inlet tube) layout, 1.5m active length
44 (with 11 sub-types, defined by angle of pipes only) barrel HEXs are required for installation in ATLAS during early 2006
Basic design layout is covered on drawing no O-TB-0049-741 (ATLICIS__0098)
Overall design, manufacturing drawings and tooling by Paul Barclay, RAL
First assembly drawing is TD-1056-501 HEX assembly, testing and cleaning by QMUL group
CLRC 2A.Nichols
SCT HEX PRR (13-5-05)
PPB1
Capillary layout
TE Bulkhead
HeaterInterconnect
Inlet PPB1
Outlet PPB1
Overall Barrel HEX layout – Drg no 0-TB-0049-741 ( ATLICIS__0098)
PPB1
HeaterOuterconnection
TE bulkhead ExhaustConnection(PPF0 equivalent)
Inlet-capconnection
CLRC 3A.Nichols
SCT HEX PRR (13-4-05)
4 Bunches of 5 or 6 HEXs Per side
PHI distribution of HEXs
Drawings are in CDD:
Side A – ATLICIS__0096
Side C – ATLICIS__0097
HEX trays have beenInstalled already in cryosatJuly 2004
CLRC 4A.Nichols
SCT HEX PRR (13-4-05)
Inlet PPB1 region
Heater outer connection
Serto couplings
Al BulkheadAttached to existingCable tray
Note – Serto st/stl couplings are standardWhere possible for ID fluid connections
PPB1
CLRC 5A.Nichols
SCT HEX PRR (13-4-05)
Heater interconnect region
Pre-installedExhaust heater
Custom HEX-HeaterConnector
HEX body
Electrical IsolatorCommercial ceramic
Inlet tubes
2:1 inlet manifold
PPB1
CLRC 6A.Nichols
SCT HEX PRR (13-4-05)
Layout of capillary
TE bulkhead
On-barrel coolingloop
Capillary
Space to storeSpare capillaryLength
Demountable exhaustconnections
Inlet-Capillary joint
Nominal capillary dimensions:ID 0.8mm, length 800mm, WT 0.2mm
Exhaust ‘spider’
CLRC 7A.Nichols
SCT HEX PRR (13-4-05)
Practical aspects of installation:
» The HEX is large (2.5*0.7m and it has no intentionally flexible parts
» It has to be installed between three points: the TE bulkhead, which cannot move, the heater, which has limited movement in Z only and the inlet PPB1, which can move in Z
» Main problem is we will not know exactly where the TE bulkhead will be until the barrel installation is done, but we have +/-2.5mm scope for positioning the HEX in R only
» So we will ‘plan for success’ by making the HEXs to size and assuming that the above conditions will apply, but
» We must have a contingency in case we get in a mess…….
» This is what we will do:
CLRC 8A.Nichols
SCT HEX PRR (13-4-05)
First step is to make a HEX template that is non-Functional, but accurate, then try it on the UCL Mock-up.
This can probably be done within the next twoMonths.
HEX service tray will be required
Cryostat
TRT Crackregion
TE bulkhead
CLRC 9A.Nichols
SCT HEX PRR (13-4-05)
Second step is to try the template on the final barrel installationAnd use it as a gauge to compare the real HEXs
Third step – in case we need to, the indium flange ‘A’ on the HEXExhaust tube can be de-soldered and re-positioned on the tubeThe flange has sufficient length of engagement with the tube to Allow this.
If we do this, the final leak test will have to beRe-done, so we need to make allowancesFor this
AA
Note – the exhaust ‘spiders’ and inlet capillariesWill be pre-installed as part of the 4-B assembly In 2005