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[videbaek <videbaek AT bnl.gov>]

Thanks,

that was indeed one of the concerns and why the tubes (har/soft) were 
selected both for compatibility with Novec as manufactory, and for rad 
hardness (NCKU tests).
we have to be careful.

-F

On 2021-05-27 16:51, Xu Sun wrote:
> Hi Flemming,
>
> Bob and Rahul told us the novec will eat up the materials and the
> leaking rate will increase with time.
>
> Best,
>
> Xu
>
> On Thu, May 27, 2021 at 4:48 PM videbaek <videbaek AT bnl.gov> wrote:
>
> > Hi
> >
> > Did Rob indicate the rationale for exchange every year. Possible Rad
> >
> > damage ?
> > It would be good to know.
> >
> > best F.
> >
> > On 2021-05-27 16:37, Zhenyu Ye wrote:
> > > This is good news, indeed.
> > >
> > > If it works, it would solve our problem for the upcoming Run.
> > > But it also brings a new potential issue, that we need to replace
> > the
> > > cooling tubes every year.
> > > If we can avoid it, it will be the best.
> > >
> > > Zhenyu
> > >
> > > > On May 27, 2021, at 2:33 PM, Tribedy, Prithwish
> > <ptribedy AT bnl.gov>
> > > > wrote:
> > > >
> > > > Hello everyone,
> > > > We have good news to share with you. With a new kind of tube that
> > was
> > > > previously used by Phenix, we might have a solution to our leak
> > > > problem. We need to do more tests, but I think this is a good
> > > > progress.
> > > >
> > > > Remember we had the following issues:
> > > > • The hard tubes were very stiff, bending radius was large
> > but had
> > > > less leak.
> > > > • The soft tubes had major leaks between layers.
> > > > A solution came after Bob/Rahul contacted Robert Pisani from
> > Phenix.
> > > > From them we got this third type: Tygon 2001 plasticizer free"
> > tubes.
> > > > With our pressurized air setup, we see NO LEAKS. No more bubbles
> > with
> > > > soap.
> > > >
> > > > Also, it's much cheaper. It costs like $2.5 c per ft (compared to
> >
> > > > $20-80 for the previous soft tube we were using).
> > > > According to PHENIX experts, they should be replaced once every
> > year
> > > > -- I think that is feasible.
> > > >
> > > > So, we'll get 25 ft of these tubes tomorrow and this way we have
> > the
> > > > full weekend to do the testing.
> > > > If things look good in next couple of days and no leaks are
> > found‚ WE
> > > > MIGHT HAVE A SOLUTION.
> > > >
> > > > We will keep you updated.
> > > > Best,
> > > > Yu, Xu and 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
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> >
> > --
> > Flemming Videbaek
> > senior scientist
> > videbaek @ bnl.gov [1]
> > Brookhaven National Lab
> > Physics Department
> > Bldg 510D
> > Upton, NY 11973
> >
> > phone: 631-344-4106
> > cell     :  631-681-1596
> > _______________________________________________
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>
>
> Links:
> ------
> [1] http://bnl.gov

--
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