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["Visser, Gerard" <gvisser AT indiana.edu>]

Flemming was the limit stated from 3M specifically in connection with high voltage breakdown? I thought it was just a general purpose guideline from them. I am not​ doubting it is a good limit, expecially the fact that newly opened container had about same about 40 ppm water assay as the opened drum is very comforting. But was the 90 ppm limit specifcally a recommendation for the situation in STAR?

    Gerard

---

From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of videbaek <videbaek AT bnl.gov>
Sent: Wednesday, October 20, 2021 4:27 PM
To: Ye, Zhenyu <yezhenyu AT uic.edu>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] NOVEC from the opened drum is good to use

 

Hi Zhenyu,

I am not sure what additional tests you are proposing? 3M gave a limit
for water content, and measurements by experts found it was very low. So
do you trust this advice and measurements or not?

best Flemming



On 2021-10-20 16:20, Ye, Zhenyu wrote:
> The reason that I propose to use the new barrels in Run22 is to avoid
> having any potential problem in the middle of the run.
> The opened drum has been in its current status in 6 years so it will
> not make a big difference to let it sit for another 6 months (let me
> know if you think otherwise). We will have plenty of time to test use
> it in the summer and continue using it in Run23 and beyond if no
> problem is found.
>
> Zhenyu
>
>> On Oct 20, 2021, at 3:13 PM, Sharma, Rahul <rsharma AT bnl.gov> wrote:
>>
>> I agree with Elke
>>
>> * Rahul
>>
>> From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> On Behalf Of
>> Aschenauer Elke-Caroline
>> Sent: Wednesday, October 20, 2021 4:12 PM
>> To: Ye, Zhenyu <yezhenyu AT uic.edu>
>> Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
>> Subject: Re: [Star-fst-l] NOVEC from the opened drum is good to use
>>
>> sorry, maybe I’m on the wrong track, but would it not be better to
>> use the open NOVEC as fast as possible to avoid that it gets water
>> in it.
>>
>> Cheers elke
>>
>> On Oct 20, 2021, at 15:59, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
>>
>> Thank you for the efforts, Prithwish.
>>
>> I would propose to continue using the small barrels of new NOVEC for
>> run 22, and use the NOVEC from the opened drum from PHENIX towards
>> the end of the run or in the summer.
>>
>> Zhenyu
>>
>> On Oct 20, 2021, at 2:34 PM, Tribedy, Prithwish <ptribedy AT bnl.gov>
>> wrote:
>>
>> Hello Everyone,
>>
>> Good news!! The report from the chemistry lab has arrived. The
>> water contamination in the remaining NOVEC liquid from the opened
>> drum is well below 90 ppm (as required for safe operations according
>> to the 3M experts).
>>
>> We provided the chemists with three samples: 1) from the top layer
>> of the opened drum (Sample A TOP), 2) from the bottom of the opened
>> drum (Sample B BOT) and, 3) from a newly opened small NOVEC
>> container (Sample C SML). All the samples have been checked twice
>> and found to have water contaminations at the level of 41-44 ppm.
>> This level of contamination is permissible for safe operations as
>> per our previous communication with the 3M experts.
>>
>> So, we can go ahead and use the NOVEC from the opened drum for the
>> upcoming run.
>>
>> We're grateful to our colleagues from the Neutrino and Nuclear
>> Chemistry group of the Chemistry Department at BNL.
>>
>> Regards,
>>
>> Prithwish
>>
>> Prithwish Tribedy
>>
>> Physics Department, Brookhaven National Laboratory
>>
>> Upton, NY 11973, USA
>>
>> Phone: 631-344-8904, 631-344-3853
>>
>> E-mail: ptribedy AT bnl.gov
>>
>> Begin forwarded message:
>>
>> From: "Gokhale, Sasmit" <sgokhale AT bnl.gov>
>>
>> Subject: Water content analysis of C4F9OC2H5 coolant liquid
>>
>> Date: October 20, 2021 at 2:28:28 PM EDT
>>
>> To: Prithwish Tribedy <ptribedy AT icloud.com>, "Yeh, Minfang"
>> <yeh AT bnl.gov>
>>
>> Cc: "Hu, Yu" <yuhu AT bnl.gov>
>>
>> Hello Prithwish,
>>
>> I hope you are doing well. I have finished analyzing the three
>> samples that you gave us. I ran two Karl Fischer titration
>> measurements for each of the three bottles that you provided i.e.
>> one sample was collected from the top and bottom of the each bottle.
>> Below are the results:
>>
>> Sample A BOT:
>>
>> Measurement 1: water content = 43.98 ppm
>>
>> Measurement 2: water content = 44.89 ppm
>>
>> Sample B TOP:
>>
>> Measurement 1: water content = 42.22 ppm
>>
>> Measurement 2: water content = 43.23 ppm
>>
>> Sample C SML:
>>
>> Measurement 1: water content = 41.98 ppm
>>
>> Measurement 2: water content = 41.79 ppm
>>
>> To check the accuracy, I also ran a sample of one of our organic
>> solvents which should have a water content between 60 to 80 ppm and
>> the measured water quantity for that liquid was 63.18 ppm. So it
>> seems the measured values can be trusted.
>>
>> Please let me know if you have any further questions.
>>
>> Best Regards,
>>
>> Sasmit
>>
>> Sasmit Gokhale
>>
>> Research Associate
>>
>> Brookhaven National Lab
>>
>> Building 555
>>
>> Upton, NY 11973
>>
>> Phone: 631-344-4992
>>
>> Email: sgokhale AT bnl.gov
>>
>> <image001.png>
>>
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--
Flemming Videbaek
senior scientist
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596
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