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    User name brads

    Log entry time 16:01:49 on December 09, 2008

    Entry number 252738

    This entry is a followup to: 252729

    keyword=Re: MWDC outflow bubbler not bubbling

    I noted that this was happening again this morning and talked to Jack about it a little. His best guess is that the inflow pressure at the regulator on the BB stack is marginal (I guess there's significant back-pressure on the line running down to the hall) -- but that can not be the whole story.

    However, back pressure doesn't explain the fact that it's bubbling in fridge, but not in the Hall. The gas is flowing into the system, but is not flowing out where it's supposed to ==> there is a leak.

    It's probably worth checking the gas connections in the shed with some Snoop -- maybe there's a leaking connection there that the temperature changes are aggravating.

    Next access we should try the following:
    1) Squirt some Snoop at any gas fitting joints in the Hall, and
    2) (if no culprit is found), try to increase the inflow rate at the fridge in the shed while monitoring the flow rate down at the chambers.
    Jack's offered to give us a hand with this.

    AFAIK, Xin has not noted any problems with the chamber performance, but having the flow through the chamber vary by factors of 30 seems an unnecessary risk.

    A copy of this log entry has been emailed to: kalyan, xqian, segal