1 Fulvio TESSAROTTO the new RICH beam pipe - pipe production, gluing and tests - measurement and removal of the old pipe - fixation system - installation of the new pipe - characteristics of the new pipe COMPASS TB meeting, CERN, 12/04/2012 Fulvio Tessarotto
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1 Fulvio TESSAROTTO the new RICH beam pipe the new RICH beam pipe - pipe production, gluing and tests - measurement and removal of the old pipe - fixation.
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1Fulvio TESSAROTTO
the new RICH beam pipe
- pipe production, gluing and tests
- measurement and removal of the old pipe
- fixation system
- installation of the new pipe - characteristics of the new pipe
- RICH is a “confined space”: access is allowed to authorized persons only
- Authorization requires a confined space formation course and a medical certification
- New procedure: CERN asks for medical certification to be provided by the Institutes.- Inside the RICH we needed a scaffolding: the old scaffolding is not complying to the rules.- The new scaffolding can only be mounted by authorized people.- The authorisation requires ….
1) a general CERN confined space course was organized and people sent to attend it
2) a medical check and certification protocol was defined, agreed upon and applied in Trieste
3) the activity inside the RICH was defined in detail and an access protocol was produced
4) the supervisor was changed
5) special exception to allow access for radioprotection experts, scaffolding responsible, etc.
6) a scaffolding was borrowed / built and certified by the responsible in Clean Area
7) authorization to mount the scaffolding by ourselves was obtained
8) authorization to use the scaffolding (after check) with a use protocol was provided
9) … 10) …
All involved persons have been extremely collaborative!
Firenze, 22/03/2012
7Fulvio TESSAROTTO
RICH opening, old pipe removal1) Radiation level: < 0.2 μSv/h2) Surveying of the old pipe3) Large scaffolding installation4) Small scaffolding installation5) Removal of the old pipe4) Mirrors surveying
COMPASS TB meeting, CERN, 12/04/2012
8Fulvio TESSAROTTO
After the removal of the old pipe
- We confirmed it is not possible to access the area downstream of the mirrors
- We decided to change the fixation system and the gas pipes to reduce the material
1) We prepared two beam pipes of 1.6 m and tested them: measured leak rate: 0.5 ml/h
2) We decided to produce a unique pipe by gluing two halves on 1.6 m
3) The vertical middle gluing needed a special microflange and a system for vertical operation
4) We continued to put pressure on Lamina, despite the denials, to try producing a 3.2 m tube
5) One 3.5 m long tube arrived in Trieste just in time.
6) The microflanges and the system for gluing were ready: the long pipe was glued and
7) Tested together with the “Tygon” pipes and plastic strips for gas connection: 0.6 ml/h
8) Both long pipes (single piece and two-halves shipped to CERN)
9) We checked that two suspensions are enough (pipe rigidity better than expected)