Method of and an arrangement for transferring a process liquid, an industrial facility and a method of simplifying the layout of such

A method of transferring a fiber suspension from a washing and thickening device to a subsequent process stage, the method comprising the steps of:

• providing the stand pipe with measuring means with a surface level control range having an upper surface level control limit and a lower surface level control limit,
• washing and thickening the fiber suspension to a first consistency in a washing and thickening device,
• discharging the fiber suspension from the washing and thickening device at the first consistency,
• introducing the fiber suspension at the first consistency directly from the top part of the washing and thickening device into a stand pipe among the fiber suspension present in the stand pipe, the stand pipe having a cross section,
• diluting the fiber suspension into a second consistency by diluting means in the stand pipe by spreading and feeding dilution liquid by the diluting means to the cross section of the stand pipe in communication with the fiber suspension, the diluting means being positioned and dimensioned such that the average consistency of the fiber suspension in the surface level control range, i.e. a third consistency, is at least 1.5 times the second consistency, and
• discharging the fiber suspension in the second consistency from the stand pipe.