[Dsg-rich] RICH gas system questions

[Marc McMullen]

Amrit,

Tom did respond with a phone call. They use nitrogen boil-off for the 
Bcal and will be using it for the DIRC. For filtering  they use a staged 
approach because they are worried about clogging their final stage 0.01 
micron.

13 micron oil/water filter

7 micron particulate filter

0.5 micron particulate

0.01 micron for the final stage.

I have requested technical documentation on their system.

We use a charcoal purifier and then a high flow 0.01 micron filter 
(60scfm at 100psi), which removes oil vapor, particles, smoke and water. 
Filter change is possible and straight forward, We will look into the 
change out frequency.

George is working on providing answers to Tyler's questions.




On 10/3/2017 9:45 AM, Amrit Yegneswaran wrote:
> excellent questions tyler.
> george, marc, and brian please start answering as many questions as 
> you can.
> we'll discuss these questions this in the dsg meeting.
> i suggest that george/marc make a simple specs document of what we 
> have currently so that it becomes a basis for a comprehensive gas 
> system document for the RICH.
>
> i suggest that some questions be discussed in the weekly RICH meeting.
>
> marc, did tom respond to your e-mail.
> if not please go meet with him in person.
>
>
>
> ------------------------------------------------------------------------
> *From: *"Tyler Lemon" <tlemon at jlab.org>
> *To: *"dsg-rich" <dsg-rich at jlab.org>
> *Sent: *Tuesday, October 3, 2017 8:18:36 AM
> *Subject: *[Dsg-rich] RICH gas system questions
>
> Hello,
>
> We have the following questions in regards RICH's gas systems:
>
> *Nitrogen Purge*
> 1.)    How pure should the nitrogen supplied to RICH be?
> 2.)    How many ppm of water can the nitrogen supply have?
> 3.)    What is the purity of Hall B's nitrogen boil-off?
> 4.)    What is the purity of the RICH nitrogen after it passes through 
> the filtering on the RICH gas panel?
> 5.)    What is the procedure to swap the nitrogen filters on the RICH 
> gas panel?
> 6.)    How often do we need to change the nitrogen filters on the RICH 
> gas panel?
> 7.)    How do we know that the filter is working correctly and the 
> nitrogen supplied to RICH is pure?
> 8.)    For a back-up nitrogen system in case we lose supply from Hall 
> B's main boil-off source, how can we fill the dewar?
>         8.1.)    Could the dewar be placed outside in an area where it 
> could be easily filled and then have a line run into Hall B?
>         8.2.)    Would it be best to use high purity nitrogen bottles 
> instead of a dewar to avoid having to refill a dewar?
>
> *Transportation to Hall B*
> 9.)    How will we ensure RICH aerogel does not absorb moisture as 
> RICH is transported to Hall B? We could set up a high-purity nitrogen 
> gas bottle to supply nitrogen to RICH on its trip to Hall B.
> 10.)    What is the purity of the nitrogen in a high-purity nitrogen 
> bottle?
> 11.)    What is the cost and lead time for buying high-purity nitrogen 
> bottles?
>
> *Air-cooling*
> 12.)    Do we need any filtering on air supplied by the Atlas Copco 
> compressor?
> 13.)    Could/should we install a desiccant on the gas panel to make 
> sure that the cooling air is dry?
> 14.)    Will we need a chiller to make the supplied cooling air colder 
> to increase cooling capacity?
> 15.)    Do we plan to monitor for condensation on the air-cooling 
> manifold?
> 16.)    Do we plan to install anything near the air-cooling manifold 
> to absorb any condensation to prevent it dripping on the electronics?
>
> Please let us know any thoughts on the above questions.
>
> Best regards,
> Tyler
>
>
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-- 
Marc McMullen
Detector Support Group
757-269-7738

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