Thanks for your responses. I did mean vacuum. My information is also that we need to pull a sustained vacuum of .1 kPa. We can pull a vacuum to .5 Torr which is about .0667 kPa. I have also reviewed the pipeline drying information and it was very helpful in pointing me in the right...
Does anyone have a procedure for drying a pressure vessel to a -20C dew point and then purging with nitrogen?. What pressure is required for a -20C dew point? Is there a table of dew points and pressures required to meet them? Thanks