>>> 'rodi' problem from bob -- Thu Dec 28 14:41:37 1989 <<<

New resin beds have been installed. 

The automatic backflush on the sand filter was serviced. The
timer and its functions were normal however the piston that
selects normal-backflush-resettle-normal, during the backflush cycle,
was allowing excessive water to flow in the resettle mode. Instead
of .5gpm being used, a full 15gpm continued to flow in this mode.
This depleted our stored volume.

The piston has been replaced, realigned and tested. The rodi
system is back up and running normally. The resistivity has
risen on sensor one substantially after the resin bed change
however sensorstat still shows 16.74 megs. The resistivity
monitor needs to be repaired or serviced to reflect real numbers.

>>> 'rodi' problem from evan -- Wed Jan  3 14:47:15 1990 <<<

Problem: chem pump not stroking fully at the speed of h2o meter pulses.
Cause: wear of piston; the pump runs at near top speed and the piston does
not recover to 'home' position after stroke.
Solution: removed every other magnet (5 of the 10) from the h2o meter pulse
generator.  This causes the pump to stroke at 1/2 the former rate.  The piston
can now easily stroke the full amount of the setting.  I have increased the
setting and should be delivering the proper amount of solution to the feed
h2o.  A new pump will be ordered since a loss of this pump would be very
bad for the RO membranes.

>>> 'rodi' problem from evan -- Wed Jan 17 15:34:06 1990 <<<

The Metronics chemical pump has been replaced.  The new model has a knob
for power setting which lets the user adjust the power applied to the driving
coil.  It is set to a point just past the stalling point.  Since the coil is
using only the power needed rather than full power at all times, the life of
the drive system should be longer. I will be fine tuning the stroke setting 
by close monitoring usage over the next few days.
Stroke is initially set at 40%.  I have also replaced the magnets in the flowmeter so that all ten are in place.

>>> 'rodi' problem from evan -- Thu Mar  1 11:31:55 1990 <<<

The di h2o loop is not running due to power transformer repair.

>>> 'rodi' problem from evan -- Wed Apr  4 13:29:16 1990 <<<

problem: alarms on low DI tank and low resistivity
cause: power interupted during YAG laser installation.
solution: reset breakers and checked rodi system
rodi is up

>>> 'rodi' fix from bob -- Sat Apr  7 21:35:36 1990 <<<

The reverse osmosis de-ionized water system has received it's
semi-annual preventative maintenance.

The system has been sterilized, all lines have been purged
and all the filters in the loop replaced. New resin beds are 
on line.

All of the equipment in the lab dependent on di is now up and
functioning. The current resisitivity is at 14 meg ohms. The
di should be at theoretical maximum, 18.2 megohms by Sunday
morning.

The di and the lab are back up and ready for use.

>>> 'rodi' problem from bob -- Mon Apr  9 14:22:34 1990 <<<

After 36 hours of operation the flow in all the di loops has
been adjusted to 1.75 gpm. The loop is balanced. A flow restrcitor
of 1.5 gpm needs to be added to the loop the custodians water comes
off of. This is not urgent and will be added to Evans techjobs.

>>> 'rodi' fix from phillip -- Fri Apr 20 06:31:43 1990 <<<

P: Many blimp messages stating low water in system.
S: The r.o.d.i. water is at 96 inches (full tank).
   I believe the water was simply used up at that time
   when user mail coincided with blimp mail.
As of this writing, the system is up and running.

>>> 'rodi' problem from phillip -- Fri Apr 20 09:00:35 1990 <<<

The top of the tank has come off. It might have
happened during the recent earthquake. A tank level
of ~72 inches makes it impossible to put it back on
at this time.
(It is resting on the top of the tank and not IN the tank.)

>>> 'rodi' problem from evan -- Mon Apr 23 09:23:00 1990 <<<

The loss of di h2o on thursday evening was probibly due to an unexpected
cycling of the sand filter back flush.  In responce to a problem of the
flush occuring too late in the morning two weeks ago, I checked the timer
and found it was running three hours slow.  On Thursday afternoon, I reset
the clock ahead three hours to the correct day/hour.  The cycle start must
have been tripped during this operation and a back flush cycle started a few
hours later (this is a week long mechanical timer so it's actions are very
slow).  The back flush uses a nearly 500 gal of h2o directly from the tank.
Combined with normal lab usage, it takes several hours to make-up enough
to restart the recirc pump.
Sorry for the inconvienience caused.  This is very unlikly to happen again.

>>> 'rodi' fix from bob -- Mon Apr 23 12:05:09 1990 <<<

The recovery of the rodi system has bee improved. We are now at
46% and will monitor quality and membrane life. This will cut
Microlab consumption of icw.

>>> 'rodi' fix from evan -- Mon Apr 23 15:21:23 1990 <<<

A 1.8 gpm flow restrictor has been installed in the di loop feeding the
custodial sink by the techroom.
