[Dsg-mvt] Mixing system

[mdefurne]

Hello,

If this is the most "convenient" back-up system, then I would say go for 
it. Nevertheless mixing system must be the priority. If it can be ready 
by the time we move the MVT in the Hall, then let's forget about this 
pre-mix gas supply.

I do not know the time scale. George, how long do you need to have this 
pre-mix system ready? Matt, how long to you need to approve this system 
if we need it? If you tell me X days, then let's check the mixing system 
status X days before the MVT installation. If we think the mixing system 
will be ready, then there will be no need to spend time on the premix 
supply in the Hall.

Apparently premix bottles will not be ordered anymore. But we will keep 
2-3 of them in case the mixing system is not ready (one bottle lasts 6 
days if no leak between the detector and the bottle).

Have a good day,

Maxime


Le 08/09/2017 à 13:35, George Jacobs a écrit :
> There was a plan earlier this year to test the FT with pre-mix, so I 
> produced the attached diagram for testing the FT with pre-mix in the 
> hall at that time. This setup uses the pre-existing lines that run 
> from the target gas pad to the downstream end of the space frame. 
> Replacing the FT chassis in the diagram with the MVT chassis is all 
> that is required to make it the MVT pre-mix gas supply. This setup is 
> quite similar to the one in EEL rm 124, but still requires a DA.
>
> George
>
> On 9/8/2017 12:14 PM, mdefurne wrote:
>> Hi Marc,
>>
>> Thank you for the update. Before inserting the MVT in the solenoid, 
>> we will have to check that everything has been plugged back properly. 
>> To do so, we will need gas.
>>
>> A back-up plan will be to have the gas line ready and plug a premix 
>> bottle on it. What is the procedure to follow to have this back up 
>> plan ready for the MVT installation in the Hall? Unfortunately it is 
>> necessary to prepare this back-up plan because we won t insert the 
>> CVT in the solenoid without checking that everything is OK.
>>
>> Kind Regards,
>>
>> Maxime
>>
>>
>> Le 08/09/2017 à 10:09, Marc McMullen a écrit :
>>> Hi Maxime,
>>>
>>> Currently the MVT mixing system is being evaluated by the Pressure 
>>> Systems authority and a location is being discussed by the fire 
>>> safety authority. If the location is moved outdoors, consideration 
>>> must be given for the mass flow controllers. The controllers 
>>> purchased are not specified to operate at a temperature lower than 50F.
>>>
>>> DSG is currently looking into another option for an MFC, while Hall 
>>> B is looking into locations and climate control possibilities for 
>>> the MFCs.
>>>
>>> With that said, Amrit and I have discussed the possibility for the 
>>> mixing system to be completed by 9/15 (possibly not even 10/15) and 
>>> we think it is not likely. George can provide further confirmation. 
>>> If it is necessary to run a premix by then, that option needs to be 
>>> expedited.
>>>
>>> Regards,
>>>
>>> Marc
>>>
>>>
>>>
>>> On 9/6/2017 1:41 PM, mdefurne wrote:
>>>> Dear George,
>>>>
>>>> Will the mixing system be ready for October 1st? If not when do you 
>>>> expect to have it ready?
>>>>
>>>> If it is not ready before the 15th, we will absolutely need the gas 
>>>> line ready so that we can plug a premix bottle to run tests: We 
>>>> will not be able to enter the CVT in the solenoid if we do not 
>>>> check the electronics connexion and gas lines. Indeed, once the CVT 
>>>> inside the solenoid, the micromegas tiles and disks will not be 
>>>> accessible anymore.
>>>>
>>>> If there is any administrative paperwork to have a premix bottle 
>>>> plugged on the gas line, please let me know.
>>>>
>>>> Thank you,
>>>>
>>>> Kind regards,
>>>>
>>>> Maxime
>>>>
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>>>
>>
>
> -- 
> George Jacobs
> Jefferson Lab (TJNAF)
> STE 12
> 12000 Jefferson Ave.
> Newport News, VA 23606
>
> (office) 757-269-7115
>
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>
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>
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>
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