[dsg-hallb_rich] [EXTERNAL] Re: Use of stiffening tool in rotation for RICH assembly?

[Sandro Tomassini]

Hi Tayler,

attached there is a photo to help in the explanation.

The rich detector  must be always rotated using the stiffening tool to 
avoid unwanted deformation of the shell especially after the mirror 
integration and alignment.

The rotation must be performed  by means of the gantry crane and the 
winch is there just for safety and for the final adjustment.

Cheers

Sandro and Marco



Il 18-Nov-21 16:36, Tyler Lemon ha scritto:
> Hello,
>
> We're compiling information for the necessary safety documentation for 
> RICH-II assembly. Part of this is evaluating the lift plan for 
> rotating RICH from horizontal to vertical (and back).
>
> In a recent meeting, INFN collaborators mentioned that for any RICH 
> rotations, the stiffening tool should be installed onto the detector 
> shell. Is the use of the stiffening tool necessary for rotations?
>
> For the previous RICH sector, we did not use the stiffening tool 
> during rotations, so its weight (an additional 625 lbs) was not 
> considered when developing the lift plan. If we do use the stiffening 
> tool during rotations, the entire process will have to be reevaluated 
> since a main concern would be that the winch used during rotation may 
> not be rated for the load of detector shell and stiffening tool together.
>
> I will plan to show more information on the lift plan from last RICH 
> assembly so we can discuss the matter more in tomorrow's RICH 
> collaborators meeting.
>
> -Tyler
>
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-- 
-----------------------------------------
Dr. Eng. Sandro Tomassini
Istituto Nazionale di Fisica Nucleare
Laboratori Nazionali di Frascati
---Research Division---
P.O.Box 13 00044 Frascati (RM) Italy
Tel. office: +39 06 9403 2919/8089
Fax: +39 06 94032256
e-mail:sandro.tomassini at lnf.infn.it
e-mail:sandro.tomassini at cern.ch
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