Using the illustrated chart giving the boiling point of moisture at various depths of vacuum, with an ambient temperature of 72 °F, what depth of vacuum would be associated with the BEST chance of achieving a dehydration evacuation with a deep vacuum pump? Illustration GS-RA-56

Illustration GS-RA-56: the U.S. Coast Guard has not released this illustration.

Question

Using the illustrated chart giving the boiling point of moisture at various depths of vacuum, with an ambient temperature of 72 °F, what depth of vacuum would be associated with the BEST chance of achieving a dehydration evacuation with a deep vacuum pump? Illustration GS-RA-56

Illustration GS-RA-56: the U.S. Coast Guard has not released this illustration.

Accepted Answer

Option D: 29.99" Hg or 254 microns of Hg absolute. Achieving thorough system dehydration requires boiling off moisture at low temperatures. A deep vacuum of 29.99" Hg or 254 microns absolute drastically lowers the saturation boiling point of water, ensuring rapid evaporation and complete moisture removal during system evacuation.