sulaterase vakumeerimine valukopast vaakumkambrisse pideva imemisega üht ja väljalaskmisega teist toru pidi (vt vaakumdegasatsioon), the Ruhrstahl-Heraeus (RH) vacuum recirculation degassing process in which molten steel is allowed to circulate in the vacuum chamber continuously by special arrangement; focused on degassing and decarbonization of steel (see: vacuum degassing)