SOB degasing pump problem
(experts Matt McCulloch and Jerry Va'vra)

Note: a recipe to restart the SOB circulating pump is available here.

The pump degasing the water going to the SOB is not working.


This problem is not critical for the SOB water quality. Therefore, our response should depend on when the problem occurs. In any case, fixing it is not really urgent and it should not interfere with data taking.


Go to the DIRC water plant. First, check the following points :

  1. The power button is in the ON position, the "power" light (green) and "run" light (orange) are ON as well
  2. The "Vacuum Pump" switch is set to manual
  3. Check directly the degasing pump (on the ground below the panel): if it is working it should be noisy and you can feel vibrations when you touch it.

:Picture of the panel of the degasing pump:

Here is the procedure to restart the degasing pump (from Matt McCulloch, x3288, pager 650-849-9626).
Please follow all steps with caution to avoid further problems and possible safety violations... Thank you!

Please note that if the GFCI outlet will not reset (or trips) at any point in the restart procedure, NO SECOND ATTEMPT SHOULD BE MADE! Further investigations should be let to experts...

  1. Put the "Vacuum Pump" switch on OFF position.
  2. Turn the power OFF using the "power disconnect" switch.
  3. Unplug all the power cords at the outlet #2PB620-01 BR-38.The power cords include 1 cord for the pump control, 1 cord for the leak detector (normally off), and 1 cord for the pump fan ( unswitched).
  4. Check to see if the outlet tripped. If so, reset the trip by pushing the largest button.
    :Picture of the outlet:
  5. Plug all the power cables in one at a time to outlet (2PB620-1 BR-38).
  6. Turn the power ON using the "Power Disconnect" switch.
  7. Put the "Vacuum Pump" switch to the MANUAL position.
  8. The degasing pump should be running now. IF NOT, TURN THE "VACUUM PUMP" SWITCH TO OFF POSITION: THIS PROBLEM SHOULD BE ADRESSED BY WATER PLANT EXPERTS AND/OR SLAC ELECTRICIANS.
Last modified: Tue Feb 7 23:25:08 PST 2006 Nicolas Arnaud

Web Page created on Summer 2005 by Nicolas (thanks Matt!)