>>> 'n2' problem from evan -- Wed Jan  3 08:57:12 1990 <<<

delivery scheduled for tonight

>>> 'n2' problem from jwalker -- Tue Jan  9 19:29:56 1990 <<<

MBE N2 use:
1/9	4" over 4 Hrs

>>> 'n2' problem from bob -- Fri Jan 12 15:35:25 1990 <<<

A quick calculation shows we will consume about 50% more N2
when we use the N2 as a backup for the air in the lab. We will
be in this mode during the power shutdown Jan 20th for 8
hrs.  It looks like this won't be any problem.

>>> 'n2' problem from harshman -- Tue Jan 16 23:33:53 1990 <<<

The MBE lab ran from 6:00pm until 11:00pm today, and the n2
tank level dropped 5" (57" to 52").  Thanks.

>>> 'n2' problem from bob -- Thu Jan 18 15:17:57 1990 <<<

Two LN cylinders were filled for the MIcrolab after lunch
today.
ML tank#1 and ML tank#4.
The heatexchanger was also deiced.

>>> 'n2' problem from jwalker -- Fri Jan 19 06:52:36 1990 <<<

I plan on running the MBE today.  The tank is now at 37".

Jeff

>>> 'n2' problem from jwalker -- Tue Jan 23 04:15:37 1990 <<<

mbe use
1/22/89
		11" over 19 hours

>>> 'n2' problem from jwalker -- Thu Jan 25 14:53:45 1990 <<<

mbe use:
1/24/90		6" over 8 Hrs

>>> 'n2' problem from harshman -- Sun Jan 28 01:12:21 1990 <<<

The MBE lab used n2 today from 10:00am to 1:00am; the tank level
dropped 8.7", from 67.4" to 58.7", during this time. 
Thanks.

>>> 'n2' problem from jwalker -- Mon Jan 29 09:16:06 1990 <<<

I plan on growing today.
Jeff

>>> 'n2' problem from tom -- Wed Jan 31 16:05:38 1990 <<<

Filled LN tank #3 and put it back on the cssem.

>>> 'n2' problem from pnelson -- Thu Feb  1 09:27:14 1990 <<<

Filled tank 2 with ln

>>> 'n2' problem from bob -- Fri Feb  2 07:16:14 1990 <<<

The LN tank was filled this morning and is at 110 inches.

>>> 'n2' problem from harshman -- Sat Feb  3 10:25:48 1990 <<<

The MBE ran on 2/2 from 4:00pm until 12:00am; the n2 level
dropped 4.4", from 108" to 103.6", during this time.
Thanks.

>>> 'n2' problem from jwalker -- Mon Feb  5 08:50:23 1990 <<<

We are running....
Started Sunday pm @96.5"

>>> 'n2' problem from harshman -- Wed Feb  7 20:31:06 1990 <<<

The MBE ran from 5:30pm on 2/4 until 10:00pm on 2/5 (28.5hrs),
during which time the tank level dropped 16.5", from 96.5"
to 80".

>>> 'n2' problem from harshman -- Wed Feb  7 23:25:31 1990 <<<

The MBE ran for 3 hours (8:20pm to 11:20pm) today, and the tank
level dropped 2.7", from 71.1" to 68.4", during this time.

Also, we plan to grow sometime during the coming weekend.
Thanks.

>>> 'n2' problem from harshman -- Sat Feb 10 22:43:40 1990 <<<

The MBE ran 12.5 hrs today (10:10am to 10:40pm); the n2 level 
dropped 7.7", from 55.2" to 47.5", during this time.
Thanks.

>>> 'n2' problem from bob -- Fri Feb 16 10:36:32 1990 <<<

Cylinder #3 has been filled and installed on the cssem.

>>> 'n2' problem from evan -- Fri Feb 23 14:55:51 1990 <<<

Liquid Carbonics has taken over a plant in Vacaville which will be our source
for LN.  The new number for scheduling deliveries is: 1-800-544-7811.  The
new dispatcher is Mike.  

>>> 'n2' problem from jwalker -- Sat Feb 24 21:25:30 1990 <<<

2/24	7.5" over 10 Hrs.

External tank now at 36"

>>> 'n2' problem from evan -- Mon Feb 26 08:03:21 1990 <<<

We are now working with a new dispatcher and delivery location (and new driver?)and were unable to get a Sunday night delivery.  The delivery is scheduled for
Monday night.  I was not aware that MBE was going to run over the weekend and
so this mornings level is lower than I had predicted.  We should be fine after
the delivery tonight.

>>> 'n2' problem from harshman -- Tue Feb 27 21:14:08 1990 <<<

The MBE ran today from 1:30pm to 6:30pm, and the tank level dropped
to 105".

>>> 'n2' problem from jwalker -- Wed Feb 28 16:09:14 1990 <<<

2/28	3.5" in 6 Hrs

>>> 'n2' problem from phillip -- Thu Mar  1 12:53:45 1990 <<<

the dewar that feeds the cssem has been filled.
pnelson

>>> 'n2' problem from jwalker -- Sat Mar  3 01:58:11 1990 <<<

3/2	12" over 17 Hrs

>>> 'n2' problem from jwalker -- Sat Mar  3 08:29:13 1990 <<<

3/3	4.5" over 6.5 hrs

>>> 'n2' problem from harshman -- Sun Mar  4 23:48:46 1990 <<<

The MBE lab used n2 from 8:40pm (n2 level 66") until 10:15pm (62.9")
today.

>>> 'n2' problem from phillip -- Mon Mar  5 10:44:16 1990 <<<

ln tank number 1 has been filled and is currently in the gas storage 
room.
pnelson

>>> 'n2' problem from harshman -- Tue Mar  6 09:27:55 1990 <<<

The MBE ran yesterday from 11:40am (n2 level=58.4") until 12:40am
(13 hours).

>>> 'n2' problem from phillip -- Tue Mar  6 12:42:01 1990 <<<

Tank#4 (the silver tank) has been replenished with
LN2. 
pnelson

>>> 'n2' problem from jwalker -- Tue Mar  6 13:58:04 1990 <<<

We would like to run the MBE over the weekend so it would be
convenient for us if nitrogen is delivered by friday.  Also, I plan
on growing tomorrow and we would like to run on Thursday as well.

Also, please add Pat Harshman to your n2 mailing list

Jeff

>>> 'n2' problem from jwalker -- Thu Mar  8 11:44:08 1990 <<<

3/7/90		8.5" over 9 Hrs.

>>> 'n2' problem from bob -- Fri Mar  9 20:28:31 1990 <<<

We have received our n2 delivery. The tank is now full and ready for use
by both the Microlab and MBE.

>>> 'n2' problem from phillip -- Mon Mar 19 11:03:37 1990 <<<


The rental dewar in the 143lab has been replenished
with LN2.

>>> 'n2' problem from evan -- Tue Mar 20 10:57:38 1990 <<<

LN delivery scheduled for Thursday night, 3/22/90.

>>> 'n2' problem from pnelson -- Thu Mar 22 12:51:56 1990 <<<

ln2 tank number 3 has been filled.
pnelson

>>> 'n2' problem from pnelson -- Mon Mar 26 08:17:41 1990 <<<

Ln2 tanks 1 & 4 have been filled.
pnelson

>>> 'n2' problem from bob -- Tue Mar 27 10:59:00 1990 <<<

A 160 litre liquid dewar was filled today by jef@argon. He is in the 
cryo group, acct pending and will be recharged for this fill.

>>> 'n2' problem from evan -- Wed Mar 28 12:41:29 1990 <<<

The charge for filling a 160L dewer:
	160L = 42.3 gal
              + 8.5 gal for spill and flash loss
              ----------
               50.8 gal X 0.93 CCF/gal = 47.24 CCF @ $0.21 = $9.92/dewer

>>> 'n2' problem from evan -- Wed Mar 28 13:04:46 1990 <<<

MBE LN usage for 2/27/90 thru 3/27/90:

49.9" over 58.5 hrs. = 38.2" X 26 gal/" = 993.2 gal X .93 CCF/gal = 924 CCF.

>>> 'n2' problem from jwalker -- Mon Apr  2 20:32:30 1990 <<<

MBE use:
4/2/90		7" over 6 Hrs.

>>> 'n2' problem from harshman -- Sun Apr  8 23:28:45 1990 <<<

MBE ran 4/8: 6" drop (56" to 50") over 8 hrs.

>>> 'n2' fix from pnelson -- Mon Apr  9 10:32:31 1990 <<<


ln2 tank number 3 has been filled, this is the dewar located in CN1.
pnelson

>>> 'n2' fix from pnelson -- Thu Apr 12 12:47:14 1990 <<<

ln2 dewar number 1 has been filled and is currently in the old lab.
pnelson

>>> 'n2' fix from evan -- Fri Apr 13 12:39:04 1990 <<<

A 160liter LN dewer was filled for Van Duzer's project.

>>> 'n2' fix from pnelson -- Wed Apr 18 09:55:47 1990 <<<

The ln2 dewar in the EE 143 lab has been filled.
pnelson

>>> 'n2' fix from pnelson -- Mon Apr 23 11:20:07 1990 <<<

ln2 dewars 1,3 & 4 have been filled and are back in their appropriate places.
pnelson

>>> 'n2' fix from pnelson -- Tue Apr 24 13:12:31 1990 <<<

ln2 dewar number 2 has been filled and is in the gas storage room.
pnelson

>>> 'n2' fix from evan -- Mon Apr 30 10:49:29 1990 <<<

MBE n2 usage for 3/38/90 thru 4/30/90

6" over 8hr = 4.4" X 26gal/" = 114.4 gal X .93 CCF/gal = 106.4 CCF

>>> 'n2' fix from pnelson -- Wed May  2 11:57:31 1990 <<<

ln2 dewar number 3 has been filled and returned to AN2d.
pnelson

>>> 'n2' fix from pnelson -- Mon May  7 11:38:19 1990 <<<

ln2 dewar number 4 has been filled and is currently in the gas storage room.
pnelson

>>> 'n2' problem from jwalker -- Tue May  8 22:39:26 1990 <<<

I noticed a possible problem with the pressure relief valve which follows
the main outside valve that controls the MBE liquid N2 line.  Since we
now have a new shut-off valve on this line inside the MBE lab, we have
been keeping this outside valve open all the time (the last month or so).
Tonight, about an hour or so after the external tank was filled, the
outside pressure relief valve on our line was releasing considerable
amounts of liquid n2 into the parking lot.  External tank pressure is just 
over 120 psi now and everything is stabilized, but we probably lost
several inches of liquid (5 in.?).  Is this release of pressure normal after
a fill, and is it just a matter of our valve popping before the
main pressure relief valve on the tank, or is this a problem?  It 
seems to me that the problem with our valve going first it would dump
liquid into the parking lot, whereas the main pressure relief valve
presumably dumps gas into the parking lot. 

If this is a problem and it is difficult to fix, we could probably be
talked into simply keeping the outside valve closed when we are not
running. 

Jeff

>>> 'n2' problem from pnelson -- Wed May  9 11:11:55 1990 <<<

ln2 dewar number 3 has been filled and is currently in CN1.

pnelson

>>> 'n2' fix from pnelson -- Fri May 11 11:37:36 1990 <<<

ln2 dewar number 2 has been filled and is currently in the gas storage rm.
