~1050 hrs. local -> Started pumps at West end of BSC6 

~1110 hrs. local -> Began heating RGA.  

RGA is isolated from BSC6 via a closed 2 1/2" metal-sealed valve.  The RGA is being pumped via a small (bolted to RGA) turbo (4.5" CFF) backed by a 2nd turbo which is backed by a scroll pump.  Vent protection is provided via an electropneumatic isolation valve in-line between the two turbos.  This valve closes upon a pressure signal or a loss of power.  A second isolation valve (spring/electric solenoid) is mounted at the scroll inlet.  This valve closes only at the loss of power.  Neither turbo utilizes a vent valve.  Backing pumps are clamped to each other and to BSC6 stand weldment.