{Kyle, Gerardo, Chandra}

Installed the first new main turbo pump station on main volume today at mid-y station. All went smoothly. We hard closed GV10 and GV11 and performed a full visual inspection on the actuator per Q1800019 and will make notes in the google sheet.

All vacuum seals are leak tight with the leak checker bottomed out at 1e-10 Torr-L/s of He, except for the manufacturer turbo vent valve which leaked in mid -9 range. We plan to replace those components with blanks and added an after market vent valve on 6-way cross. 

We spun up the turbo and tested a few controls functions. The new three-position switch mod works as intended. The pressure fell to 1e-7 Torr.

This task took most of the day and GVs were closed from about 8:30 am to 4:30 pm. Gerardo and Kyle bumped them open to slowly peel away the o-rings.

The new safety valve is a spring closed, electro-magnetic style, so no more need for instrument air. We found a small air leak in the instrument air line in mechanical room and notified Bubba.

Good work, team!

Work permit 8250 closed.