BGV 03-nov-2015CERNMassimiliano Ferro-Luzzi 1 BGV cooling : status and TS3 installation plans Valdir & Massi

BGV 03-nov-2015CERNMassimiliano Ferro-Luzzi 2Status  Cooling installed for BOTTOM detectors  TOP lines from manifold are in closed loop with valve quasi-closed  Valdir reports a leak when circulating of about 21 to 36 ml/h –See BGV meeting #65, 8-sep-2015  Reports also: when OFF the leak seems smaller, < 1.78 ml/h –See BGV meeting #66, 22-sep-2015  Access on 14-oct-2015, –Level at ~1.4l, down from ~2.6l on 07-sep-2015, thus ~1.5 ± 0.4 ml/h –Refilled and restarted cooling circulation, set point 0.7bar 15C  Chiller turns OFF (failure) on 19-oct-2015 ? – “the relay lock of the safety mechanism is still active”  Need access to restart (we have no remote power cycle option)

BGV 03-nov-2015CERNMassimiliano Ferro-Luzzi 3 Plan for TS3  Prepare four distributors with all tubing and insulation –Leak-test in the lab  Set up a plateau just above the BOTTOM distributors, with brackets on the four poles of the BGV frame  Install distributors (when ?)  Connect TOP module cooling lines (when ?)  Circulation test, check flow and leaks at module connections  Finish insulation  Chiller will probably need a refill  If time enough: test with dry air interlock

BGV 03-nov-2015CERNMassimiliano Ferro-Luzzi 4 Remote power cycling of chiller  Chiller now on UPS-backed mains  How to make it remote power-cyclable ? Power Relay switch (Default closed) LAN-controlled mains sockets Solution 2 (no UPS backup) Solution 2 (no UPS backup) Solution 1 (with UPS backup) Solution 1 (with UPS backup) Where can we find one in RA43 ?