detank

de- +‎ tank

detank (third-person singular simple present detanks, present participle detanking, simple past and past participle detanked)

1. (aerospace, transitive) To empty (some substance) from a tank.
   • 1974, NASA technical note (part 7612, page 53)

     During the test, the conformal skin heaters were operated and exercised to simulate various thermal conditions; the cabin was pressurized and depressurized; simulated propellant was detanked; […]

2. (aerospace, transitive) To empty (a vehicle or equipment, or its tanks).
   • 1970, Society of Experimental Test Pilots, Symposium Proceedings, volumes 14-15, page 127:

     The number two oxygen tank in the Service Module could not be detanked properly after the countdown demonstration test.

• tanked