[Dsg-rich] Ventilation Purge presentation

[Marco Mirazita]

Hi George,
the test in my mind would be planned for next week. Together we would 
also make some light-tightness check.
However, there is a big preparatory work to be done:
1) Drill the holes on the cable raceways, reinstall them on the RICH and 
seal with silicone. The size of the holes for the N2 inlet and outlet 
have been fixed, we are still discussing on the holes for the 
temp/humidity sensors and fibers and on their location. I hope this will 
be defined soon.
2) Install the exit panel and the stiffening tool.
3) Make the EPanel region on the RICH light- and gas-tight with plastic 
and some black cloth.
4) Rotate the RICH.
5) Install the frontal panels. It would be good if we could do this 
operation with the dedicated frame, but I don't know when the stiffening 
profiles will be delivered by 8020. If they are not available, we can do 
this operation as it has been already done in the past.
6) Look for big leakages in the RICH structure and seal with silicone.
Then, we can start filling the RICH.
My opinion is that the test will likely occupy the whole week, but the 
main point is when we can start with the operation 1).
We can discuss more in details tomorrow at the installation meeting.
And from next Monday I will be at JLab.
Marco



Il 2017-10-12 14:57 George Jacobs ha scritto:
> HP bottles would work, but, at 40 slm, it will empty in <4 hours. So,
> the plan is to use 2 dewars in parallel. What is the time line on this
> test?
> 
>  George
> 
> On 10/12/2017 6:01 AM, Marco Mirazita wrote:
> 
>> Hi Amanda,
>> thank you for your report, I have a couple of comments on the
>> Nitrogen system.
>> - The 8 hours to fill the RICH are calculated assuming a perfectly
>> sealed detector, which most likely is not. Thus I will say we need
>> at least 8 hours, but, depending on the gas leak rate, the time
>> could be much longer. We can only try and see.
>> - If the present dewar is not able to provide 40 slm, do we have an
>> alternative solution, like bottles for example?
>> Best regards,
>> Marco
>> 
>> Il 2017-10-11 22:07 Amanda Hoebel ha scritto:
>> 
>>> Hi,
>>> 
>>> Attached is a presentation given during the DSG weekly meeting
>>> regarding calculations and questions on the N2 purge and e-panel
>>> air
>>> pressure.
>>> 
>>> Regards,
>>> Amanda
>>> 
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> 
> --
> George Jacobs
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