The invention relates to an arrangement for gas removal including a vertical cylindrical vessel (1) having an outlet (8) and a tangentially arranged inlet (6). The inlet includes means which bring an incoming fluid (4) into a jet which is sharply delimited in the radial direction and runs close to the vessel's (1) inner surface (5) at such a high initial velocity that an upwards open whirlpool (12) comprising a curved fluid surface (11) is formed. The outlet (8) is arranged tangentially at a level which is below the fluid surface (11). The invention also relates to a method for degassing a process fluid, wherein a deep whirlpool (12) including a curved fluid surface (11) is formed in a cylindrical vessel. At said fluid surface gas is brought to escape by means of centrifugal forces acting within the fluid. The invention further relates to the use of the above arrangement and method, respectively, for deaerating a process fluid in paper- or cellulose making.