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:
- there should be a red alarm on the Beta alarm panel for the channel
'DRC SOB LEAK';
- you should have heard some audio messages telling you that the water
has been dumped plus some loud noise coming from the 620 hall;
- several alarms should be visible in the ALH:
- DRC → DRC_GAS-WATER → SOB_WATER_SYSTEM → SOB dump
- DRC → DRC_GAS-WATER → SOB_WATER_SYSTEM → SOB water level
- DRC → DRC_GAS-WATER → DRC_GAS_WATER_SIAM → SIAM_8 → Channel 0: sob dump initiated
- there should be several other SIAMs tripped in the DRC →
DRC_GAS-WATER → DRC_GAS_WATER_SIAM panel. They are very important to
understand why the dump occured and so a snapshot of the
corresponding epics panel should be added in the logbook.
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
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.
- 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
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.
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
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
- 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.
- You can also warn the IR2 safety
officiers: Joe Kenny,
Frank O'Neill or
The SOB water must be released up to the top of the hill
using the blue mobile pump which is also located outside the
Unless there is an urgent need to drop the water, you
should not operate the pump yourself.
- Contact the Site Engineering and Maintenance Service (x8901) to request
that a tech. be sent to IR2 to operate the pump.
- Outside week day time, you can call MCC: they'll take care of your
- Mike Hug normally needs to come in IR2 to
estimate the amount of water to be released up-hill and to give the green
If you have to operate the pump yourself, use the two pictures below as a
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.
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.
Last modified: Sun Feb 5 21:32:17 PST 2006