April 12 2018

From: "Edward Daly" <edaly@jlab.org> To: "Nusair Hasan" <hasan@jlab.org>, "Joe Wilson" <jwilson@jlab.org>, "Kevin Jordan" <jordan@jlab.org>, "Joe Gubeli" <gubeli@jlab.org>, "James Henry" <jhenry@jlab.org>, "Keith Harding" <kharding@jlab.org>, "Joshua Armstrong" <ajoshua@jlab.org>, "Matt Marchlik" <marchlik@jlab.org> Cc: "Kelly Dixon" <kdixon@jlab.org>, "Jonathan Creel" <creel@jlab.org> Sent: Thursday, April 12, 2018 4:53:26 PM Subject: Note from LERF Cryo System Mtg - 12APR2018 Dear All, Here are notes from the meeting: - Jim provided a description of the system. Josh and Keith described details of their systems. - Need to add tee for 3 atm He supply; consider adding isolation at LERF vault for the 3 atm warm He line. Nusair to check where 3 atm warm He supply line can be isolated in CHL. Kevin will check in the LERF. - P&ID needs to be signed. - Warm gas flow maximum is 3 g/s. - Use a bellows sealed manual valve for cooldown line. Nusair to provide part number. - Cryo recommends a relief valve that has guard vacuum for the cooldown line. This requires a change to the P&ID. Cryo has a design for the guard vacuum relief valve drawing. Nusair to provide to Keith. - Relief system on Cryo Can includes two ASME stamped reliefs. - Guard vacuum line has all-metal valve to isolate the wall lines from the Cryo Can and CM. - Remove valve and tee from guard vacuum line. Guard vacuum will be at atmospheric when connection between Cryo Can and transfer lines. (Keith) - We reviewed some of the comments from the 15-Mar email. - Need to consider how to manage the heat from the cryomodules during steady state operation. - Pumpdown control will need to use the heaters. - Ensure no interferences with the dummy beam pipe. (Jim)

Need to plan a future meeting to review P&ID and detailed operational procedures.

Please let me know if there are any corrections. Thanks, Ed