Hi Roberto et. al.,
Below is what Ray told me this morning. They were waiting for the
C-AD vacuum group for the tech / leak detector. I talked with
Mike Mapes and
he's not sure whether he'll be able to help Ray today as they have
a bake-out event in NSRL (though he said he'd try). ( And not all
the vacuum group
staff would come back immediately on Tuesday. ) I'll ask Ray and
the vacuum group next Tuesday or so ...
I think Ray is working along with your "philosophy" (checking the
outside/lower portion before tearing anything apart) ... And if
needed, we'll use air
or nitrogen to flush the not-very-big vacuum system (inside Valve
Box).
Kin
-------- Forwarded Message --------
Subject:
RE: checking with you
Date:
Fri, 4 Sep 2015 10:59:02 -0400
From:
Ceruti, Raymond B <rayc AT bnl.gov>
To:
Yip, Kin <kinyip AT bnl.gov>
Hi
Kin,
We were in 912 early this morning and opened up the curved
door by the scaffold. I sent a request to the CAD vacuum
group to once again borrow a tech and leak detector. When
they get back to me we will first attempt to pressurize the
lines and sniff suspect areas inside the can. There are
many people using up vacation time so I can’t say how long
this will take but will keep you posted as to any progress.
Regards,
Ray
From:
Kin Yip [mailto:kinyip AT bnl.gov]
Sent: Friday, September 04, 2015 10:49 AM
To: Ceruti, Raymond B
Subject: checking with you
Dear Ray,
I went to the Valve box area around 10:30 am today and I
didn't see any of you .... So, I'm just trying to check
with you ...
I saw that the bottom part is open and are you trying to let
the He go away naturally ? ( We can use air/nitrogen,
instead of HD that our
safety people are worried. )
Will you try to do what Roberto is suggesting ("Can
we bag them individually and then insert the sniffer
probe?") ??
In any
case, can you please let us know the status (by the end of
today) ?? ...
Kin
On 09/03/2015 02:27 PM, Ceruti, Raymond B
wrote:
Hi
Kin,
I’m out this afternoon on personal business. I’ll be back
tomorrow morning as usual. We don’t have to resort to
anything major until we do more testing which we intend to
do. See you all tomorrow.
Regards,
Ray
From:
Kin Yip [mailto:kinyip AT bnl.gov]
Sent: Thursday, September 03, 2015 2:03 PM
To: Ceruti, Raymond B; Than, Yatming (Roberto)
Subject: Re: [Sphenix-magnet-l] leak in the He
pipeline of Valve Box (2nd trial)
Hi Ray,
I can't find you on the phone and so I type this email. Do
you think what Roberto suggests make sense and do what he
suggests before
we start the difficult "surgery" into the valve box ?
( Or, we need to have a meeting to talk about it ?? )
Kin
On 09/03/2015 01:23 PM, Than, Yatming
(Roberto) wrote:
Ray,
Before
we move upward, let’s double check the leak check at
the lower capped joints.
Can
we bag them individually and then insert the sniffer
probe?
Helium
will accumulate in the high points, so it is natural to
see a higher readout when you move into the chimney.
You
have a -3 range leak is what I read, which is a large
leak.
When
we move upward we need to remove all the MLI insulation
in order to bag and sniff the joints.
Roberto
From:
sphenix-magnet-l-bounces AT lists.bnl.gov
[mailto:sphenix-magnet-l-bounces AT lists.bnl.gov]
On Behalf Of Ceruti, Raymond B
Sent: Thursday, September 03, 2015 11:59 AM
To: Yip, Kin; sphenix-magnet-l AT lists.bnl.gov
Subject: Re: [Sphenix-magnet-l] leak in the
He pipeline of Valve Box (2nd trial)
Hi
All,
After our unsuccessful pressure leak test this morning
we dropped the lower vacuum can (the easy one to remove)
and sniffed all the joints that were accessible. Those
joints were found to be not leaking but with the probe
inserted up into the heat shield from below, the leak
detector dropped down a decade. This seems to indicate
that our leek is more than likely in the upper area. I
would suggest that we remove at least one door and pump
on the helium line in an attempt to locate this leak.
Regards,
Ray
From:
sphenix-magnet-l-bounces AT lists.bnl.gov
[mailto:sphenix-magnet-l-bounces AT lists.bnl.gov]
On Behalf Of Kin Yip
Sent: Thursday, September 03, 2015 10:59 AM
To: sphenix-magnet-l AT lists.bnl.gov
Subject: [Sphenix-magnet-l] leak in the He
pipeline of Valve Box (2nd trial)
Hi,
After gathering M. Gaffney and the safety people, Ray
Ceruti and his team pumped in He (to the max. of 6.6
bar) to do the pressure test.
Before the pressure test, the vacuum pressure was at the
level of something like 7*10-9 mbar or so. But after
pumping in He, the pressure
reached 10-3 mbar in about 10 minutes. So, there is a
leak (though may not be huge). [ In the process, they
found a O-ring outside that
was burst but that's not the reason as it's between
the outside atmosphere and the valvebox (not between the
He pipeline and inside valvebox. ]
Ray et. al. now need to find it (by breaking up the
system piece by piece) ... I have the impression that
it's not easy ......
Kin
|
