[Hallb-engineering] [New Logentry] Follow-up Re: Hall B Cryogenic Problem - PLC/Comms/Blowing Reliefs
kashy at jlab.org
kashy at jlab.org
Thu Sep 14 02:20:03 EDT 2017
Buffer Dewar put on warm return. Its current level is 49%
RV8120 sealed itself after the pressure dropped due to 4K supply and return shutoff.
I manually opened EV8670BY by lifting the actuator up ~0.2" to allow a bypass around the solenoid heat shield. This helped drop the pressure on RV8670 and I used the hair dryer (hot air gun) to melt the ice and get the relief to seal.
We should do the following ASAP
1) add a 30/30 gage to the guard vac pump line (PT8677)
2) Find and position the EV manual control box
3) Get a new on-call list to the guard shack (theirs is from 2012)
4) Determine how we will get 24/7 on-call support for PLC's of the new cryo system (both short and long term)!
1) remount EV8670BY before starting the cooldown
We should consider doing the following before starting the cooldown:
1) installing the new flow meters on the magnet warm return gas panel, this is not needed now and can wait for a future warm up of the solenoid, but if time allows it can be down now...
In the not to distant future we must:
1) make a drip tray around RV8670
2) make a drip tray around the Torus service tower
3) figure out how to get the guard shack involved in cryo alarms for Hall B. The automatic text/e-mail to cell phones is not sufficient! there were lots of mails/texts last night to phones including my own but the only reason I knew of this was a phone call to my home phone from a person. Thanks Jonathan Creel! He got the notice that there was a cryostat leaking in Hall B from the crew chief who got the message from a guy on the PSS team. Then the guard shack will be able to call down the list including home numbers until someone is reached!!!
This is a plain text email for clients that cannot display HTML. The full logentry can be found online at https://logbooks.jlab.org/entry/3484401
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