Kyle, Chandra

We ran all QDP80 roughing pumps on site today for maintenance and for refresher (WP 6269); checked for gross leaks in foreline/turbo volumes. Found one at MX.

EY
as found pressure
foreline = 14 Torr
turbo = 0.58 Torr
after rough pump down and following valve isolation
foreline = 0.040 Torr
turbo = 0.036 Torr

MY
as found pressure
foreline = 2.3 Torr
turbo = 0.60 Torr
after rough pump down and following valve isolation
foreline = 0.013 Torr
turbo = 0.022 Torr

LVEA - vertex
as found pressure
foreline = 2.2 Torr
turbo = 0.67 Torr
after rough pump down and following valve isolation
foreline = 0.017 Torr
turbo = 0.022 Torr

LVEA - Xbeam manifold
as found pressure
foreline = 12 Torr
turbo = 0.63 Torr
after rough pump down and following valve isolation
foreline = 0.021 Torr
turbo = 0.039 Torr

LVEA - diagonal
as found pressure
foreline = 5.4 Torr
turbo = 0.54 Torr
after rough pump down and following valve isolation
foreline = 0.026 Torr
turbo = 0.039 Torr

LVEA - Ybeam manifold
as found pressure
foreline = 5.4 Torr
turbo = 0.48 Torr
after rough pump down and following valve isolation
foreline = 0.025 Torr
turbo = 0.034 Torr

MX
as found pressure
foreline = 780 Torr
turbo = 1.0 Torr
after rough pump down and following valve isolation
foreline = leaking
turbo = 0.084 Torr

EX
as found pressure
foreline = 6.6 Torr
turbo = 0.43 Torr
after rough pump down and following valve isolation
foreline = 0.017 Torr
turbo = 0.026 Torr


The leak in the X-mid fore line is between the Turbo Header isolation 
valve and the Turbo fore line Safety Valve. Removed and examined the 
NW seals but nothing obvious.

We verified each QDP80 shuts down with the absence of N2 purge seal gas supply except the Y-end QDP80 which did not shut down.

Y-mid pump turned off due to overheating because cooling water was not valved in initially. It leaked a small puddle of coolant and ran OK upon cooling.

We pumped down the purge air line in LVEA unintentionally.