Method for constructing a flotation apparatus, flotation apparatus, method and system for flotation and use

A method for constructing a flotation apparatus, the method comprising:

• providing a flotation vessel and a cover for closing an upwards open opening of the flotation vessel, wherein the cover and the vessel limiting a vessel space for receiving fluid,
• providing an agitating means having a rotatable shaft,
• arranging the rotatable shaft of the agitating means to extend through a first aperture in the cover,
• supporting the rotatable shaft at a bearing housing outside the vessel space,
• providing a connection arrangement that surrounds the rotatable shaft between the bearing housing and the cover,
• attaching the connection arrangement to the bearing housing and to the cover so that the connection arrangement hermetically sealing the rotatable shaft between the bearing housing and the cover,
• providing a connection arrangement comprising a connection piece surrounding the rotatable shaft between the bearing housing and the cover,
• the connection piece that is provided comprising at an end facing the bearing housing a first opening for the rotatable shaft,
• the connection piece that is provided comprising at an end facing the vessel space of the flotation vessel a second opening for the rotatable shaft,
• the connection piece that is provided comprising at least two connection piece parts releasable connected to each other so that division planes between said least two connection piece parts extending between the first opening and the second opening,
• providing a gas feeding means comprising a gas feeding duct in the rotatable shaft of the agitating means, outside the vessel space a gas inlet for feeding gas into the gas feeding duct, and inside the vessel space a gas outlet for feeding gas from the gas feeding duct into the vessel space,
• connecting the gas feeding means in fluid connection with the vessel space, and
• arranging the bearing housing between the gas inlet and the cover.