[Dsg-rich] RICH N2 Supply Corrective Actions

[Bob Miller]

Hi Marco,

The following corrective actions have been completed:

 1. Administrative tags have been placed on all valves, pressure
    regulator, and rotometer from the N2 dewar to the RICH detector to
    keep N2 flowing at the correct pressure and flow rate.
 2. Two banks of N2 bottles have been installed in the Hall and are on
    line.  Administrative tags have been placed on the valves also.
 3. During the Sep-Oct maintenance period, I will move the N2 gas panel
    supply valve to the N2 gas panel
 4. An alarm has been set up at 20 psi N2 supply pressure that will
        notify the engineering on call person.  Normal N2 supply
    pressure is 35 psi.
 5. An alarm has been set up at 10 psi for the back up bottles to know if
        they are ready to supply the RICH.  This alarm will also notify the
        engineering on call person.  Back up N2 pressure is 20 psi for
    bank 1, and 15 psi for bank 2.
 6. Tyler Lemon will determine the cost of the N2 back up bottles and we
    will decide if we should change the back up supply to our argon dewar.

Regards,

Bob


On 6/25/2019 6:45 AM, Marco Contalbrigo wrote:
> Dear Bob,
> thank you for the notice and the accurate mitigation measures.
> (Sorry if I answer now: I was distracted by the coll.
> meeting last week).
> Best regards, Marco.
>
> On Tue, 11 Jun 2019, Bob Miller wrote:
>
>> All,
>>
>> The following corrective actions will be taken to ensure the RICH N2 
>> supply is not interrupted:
>>
>> 1. The N2 supply valve is now locked open and has a lock out tag on it
>>    as shown in the pictures below
>> 2. Replacement back up bottles have been ordered by Tyler
>> 3. When the replacement bottles have been installed, I will move the
>>    supply valve to the RICH gas panel
>> 4. An alarm has been set up at 20 psi N2 supply pressure that will
>>    notify the engineering on call person
>> 5. An alarm will be set up at 10 psi for the back up bottles to know if
>>    they are ready to supply the RICH.  This alarm will also notify the
>>    engineering on call person.
>>
>> Regards,
>>
>> Bob
>>
>>
>>
>>
-- 
Bob Miller
Hall B Lead Engineer
Jefferson Lab
757 822-9586

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