Abstract: In an apparatus for separating gas from a high consistency fibre suspension, the apparatus comprising a rotor chamber (2) containing a first rotor (11) provided with blades (10), a gas space (3) containing a second rotor (13) provided with blades (12), a wall disposed between the rotor chamber and the gas space consititutes an annular gas discharge channel surrounding a shaft rotating the rotors. Rotating blades (14) are disposed in the gas discharge channel between the first and the second rotor.

Abstract: A method and apparatus allow the simple and effective attachment or detachment of a centrifugal pump to a tank while the tank is filled with a liquid or suspension. The pump rotor is axially movable from a first position where a portion of the rotor is inside the tank, to a second position where no portion of the rotor is inside the tank. With the rotor in the second position, a closing member mounted interiorly of the tank is actuated by an actuator exterior of the tank to effect movement of the closing member to close off a liquid or suspension discharge opening in the tank. The pump housing can then be flushed out, and detached from the tank. During reattachment, the pump housing is filled with fluid under pressure to substantially equalize the pressure on opposite sides of the closing member before the closing member is moved to uncover the tank discharge opening.