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Message ID: 1840     Entry time: Thu Aug 6 09:05:29 2009
Author: steve 
Type: Update 
Category: VAC 
Subject: large O-rings of vacuum envelope 

The 40m-IFO vacuum envelope doors are sealed with dual viton O-rings and they are pumped through the annulos lines.

This allows easy access into the chambers. The compression of the o-rings are controlled by the o-ring grooves.

The OOC (output optic chamber)'s west side door has no such groove and it is sealed by just one single O-ring.

We have to protect this O-ring from total compression by 3 shims as shown below.

There were control shims in place before and they disappeared.

Let's remember that these shims are essential to keep our vacuum system in good condition.


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