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Message ID: 13     Entry time: Thursday, October 18, 2012, 08:26
Author: Keith C Ng 
Category: M9 
Type: Repair 
Subject: M9 T2 joint repair cont. 

Yesterday:

Installed indium blank off at M9 T2 joint and pumped down at 15:20 to 15:45 overnight. 1ACG7 (T2 vacuum pressure) reads between 6.0E-3mT and 2.0E-2 mT as of 8:15 today.

- Before installing, an attempt was made to set the bellows in a position to correct for some of the misalignment. This was done by closing the joint with no ring and pinning the east flange ear and leaving it for ~1 hour.

- Blank off installation began at 12:30

- A universal joint installation tool was used to install the East pin. This was due to the very small gap available to install the pin on the East side. The east side of the flange was also pried upon in order to close the east side of the joint. As a result the pin leans North once installed. West pin was installed with no issues.

- Installation finished at 14:30 (roughly two hours, not including flange prep work)

- An inspection after installation revealed the lower lug to be in tension an hour after installation of the pins and blank off.

- Spring eye gaps on installation appeared to be 0.05" to 0.06" on the west side and ~0.2" on the east side.

 

Will be doing inspection and leak check later today.

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