Weixing,
In my experience, this usually happens as a result of a change in the level
of "ground water" wrt to the foundation of the building.
If there is an architectural issue, change, or cause, or if there has been a
change in the land around your lab, it is possible that correcting that
problem, might solve your problem.
Otherwise, in my experience, there is no way to "stop" the water from coming
into the pit, from within your lab, in any durable way from 'inside'.
Traditionally in architecture, the only "solution" to this problem is to
ramp the magnet down, have contractors drill a ~2 ft dia hole on the bottom
of your pit, and install a "sump pump" to eject the water via a pipe before
it rises to a point that poses a problem.
I think you will find that any attempt to 'coat the walls' with 'waterproof
paint' will simply fail repeatedly.
(You may want to put the pump on a timer instead of a float actuation so
that it doesn't run during experiments.).
Best,
Richard Hullihen
m2m Imaging
From: Zhang, Weixing [mailto:Weixing.Zhang_at_STJUDE.ORG]
Sent: Wednesday, April 14, 2010 3:11 PM
To: ammrl_at_ammrl.org
Cc: Structural Biology - NMR
Subject: AMMRL: Water seeping into the pit of the 800 MHz magnet
Hello:
Recently we found some water seeping into the pit of our 800 MHz magnet.
The magnet is about 7 years old, but the seeping water was just found
recently.
There are two possibilities:
1) Water leaking from a drainage pipe nearby.
2) Underground water seeping into the pit because the pit is lower than
the ground level.
Has anybody seen this kind of problem?
If it is underground water, what is the best method to stop it?
Thanks,
Weixing Zhang
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Received on Sun Apr 18 2010 - 17:48:28 MST