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Maintenance for DRP-05

Sunday, October 8, 2017
Full rebuild
Equipment/Beam Line: 

Pump found not performing to sufficient levels.  Pump had previously had tip seals changed, hence it was due for a full rebuild.  Nothing unusual noticed.  Full rebuild performed and orbiting plate set to .069".  Test showed excessive heat, 72C.  Pump disassembled and 1st stage was shown to be hotter than the second stage.  No evidence of the second stage tip seals wearing in.  Orbiting plate set to .068 to engage second stage more and to relieve 1st stage.  Pump currently being tested.  Vacuum leveled out at 20mTorr, but calibration of the Convectron gauge suspected to be off.

It should be noted.  The orbiting plate bearings have been in the oven before.  They have not been used, but the grease has seen 400F for 1 hour.

Deepak Vyas