[Clas12_rich] RICH Cooling system and nitrogen purge system THA

[George Jacobs]

You will not need a THA for ODH in Hall B. You are simply replacing a 
volume of C4F10 with the same volume of N2.

On 6/9/2016 7:31 AM, Marco Contalbrigo wrote:
> Dear Tyler, dear George,
> in one of our previous review, the committee recommended:
>
> The dry nitrogen volume, allbeit relatively small, shall have an
> approved oxygen deficiency hazard safety review per JLab ODH guidance.
>
> What I understood is that we would need a THA also for the oxygen
> hazard. Given the small N2 flow and the relative small RICH volume
> with respect the Hall-B volume I guess the risk is negligible.
> Can anyway George add a THA for this hazard ?
>
> Thanks, Marco.
>
> On Tue, 31 May 2016, Tyler Lemon wrote:
>
>> Dear Valery,
>>
>> Attached is the draft of the THA we have written for the RICH cooling 
>> system and nitrogen purge system. The attached document where George 
>> explains the interlocks for the cooling system should be included 
>> with the THA. Attached are also system diagrams for the cooling and 
>> nitrogen purge system.
>>
>> Best regards,
>> Tyler
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George Jacobs
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