Procedure to be followed after a SOB dump

This document mainly describes the procedure to be followed after an accidental dump of the SOB water. If the dump is real, some DIRC experts are probably already on their way to IR2: if you are the shift leader, page immediately the DIRC oncall expert to make sure he's aware of the situation. Then, go to the procedure and try to complete its steps.

Additional useful information can also be found in the two other sections:


Make sure that the dump is real

In case of a real dump:

List of relevant DIRC experts to be contacted

The DIRC Water experts are Matt McCulloch, Jerry Va'Vra and Tom Weber. Their detailled contact information can be found in the DIRC expert webpage from the Care and Feeding manual which also lists all the other DIRC experts.


After dump procedure

First of all, if the dump occured while the DIRC HV was ON (at runnable or injectable voltage, the difference doesn't matter here), they should be turned OFF immediately.
To do this, open the 'DIRC POWER SCREEN': 'BABAR Online Detector Control' → 'DRC' → 'ON/OFF'. Then turn the HV crates off by pushing the 'OFF' button of item 3.c. Then, open the 'DIRC High Voltage Control' ('BABAR Online Detector Control' → 'DRC' → 'More' button on the 'High Voltage' panel) to see the 12 DIRC crates going 'OFF' one after the other.
If after few tens of seconds the 'ON' sign is still visible on some of the sectors, click the corresponding 'OFF' yellow buttons to turn them off manually.
When the DIRC oncall expert calls in or arrives in IR2, let him/her know about the HV status.

The DIRC SOB contains ultra-pure water which cannot be released in a drain ultimately ending in the Bay. That's a County law SLAC has to apply -- there are concerns about the fish health. Therefore, to avoid turning the SOB water dump into an environmental hazard, the following steps must be followed closely and as quickly as possible.

  1. Go outside the Cornelius room and turn off the two pumps running during standard operations. Use the panel which is on your left a few meters after the stairs.

    This action must be completed asap, even before letting ES&H know that the water has been dumped. No particular training is necessary to stop/start these pumps.

    In case of heavy rain, do not stop the pumps: a flood in or around IR2 is a more important concern. In such situation, it would be anyway too late to prevent the ultra-pure water from contaminating the water drains.

    Use the two pictures below as guidances.

    :Picture of the pump outside IR2
in 'ON' mode
    Pump panel outside IR2 during normal operations: the two pumps are set to the 'AUTO' mode (look at the black-grey buttons in the middle of the picture).

    :Picture of the pump outside IR2
in 'OFF' mode
    Pump panel outside IR2 in case of a SOB dump: the two pumps are set to the 'OFF' mode (look at the black-grey buttons in the middle of the picture).
  2. Notify Mike Hug from the ES&H Environment Protection that the SOB water has been dumped. His SLAC extension is 4042 and his pager number (650) 849-9625.
  3. You can also warn the IR2 safety officiers: Joe Kenny, Frank O'Neill or Sandy Pierson.
  4. The SOB water must be released up to the top of the hill using the blue mobile pump which is also located outside the Cornelius room.

    Unless there is an urgent need to drop the water, you should not operate the pump yourself.


    If you have to operate the pump yourself, use the two pictures below as a guidance.

    :View of the secondary blue pump
    General view of the secondary blue pump outside the Cornelius room. It is used to pump up-hill the SOB water. To tune its power one needs to slightly pull out the button in the bottom left of the picture (inside the red frame). If it is too tight one can slightly unscrew it.

    :View of the left side of the
secondary blue pump
    The key to turn ON/OFF the pump is on the left side of the pump -- see inside the red frame.

    Once all the water has been pumped up, just turn OFF the secondary pump and turn ON the main ones using the same panel as in step 1.


Nicolas Arnaud
Last modified: Sun Feb 5 21:32:17 PST 2006