Gerardo M., Kyle R.

The modified annulus piping was finished being installed on GV11 today.  The new arrangement eliminated some unneeded joints and lengths (runs) of piping and  now everything is much "tidier".  As part of this exercise we vented the gate annulus volume with UHP N2 and observed that neither the inner nor the outer gate O-rings leak now.  Prior to baking CP4, both of GV11's gate O-rings leaked significantly, as well as, GV12's inner gate O-ring.  The assumption being that the Viton had become less compliant after 20 years exposure to vacuum but must have softened after 8 weeks of being compressed and heated.  We are pumping the annulus volume with a turbo overnight and will helium leak check tomorrow.

Next, we will repeat this exercise on GV12.