A cleaning in place, CIP, unit for cleaning a liquid food processing plant by means of a cleaning liquid, the CIP unit comprising: one or more control valves; a flow rate arrangement configured to control a flow rate of the cleaning liquid; a balance tank configured to balance a volume of the cleaning liquid at an atmospheric pressure; and a heat exchanger configured to transfer heat to and/or from the cleaning liquid; wherein the one or more control valves, the flow rate arrangement, the balance tank and the heat exchanger are connected in series thereby forming a main circuit section, the main circuit section being configured to be connected to the liquid food processing plant thereby forming a main circuit with the liquid food processing plant, a high pressure circuit section configured to bypass the balance tank, the high pressure circuit section comprising: a further control valve configured to control the liquid flow of the cleaning liquid to bypass the balance tank, characterised in that the CIP unit further comprises a pressure arrangement configured to control a pressure of the cleaning liquid, wherein the pressure arrangement is configured to increase the pressure of the cleaning liquid above atmospheric pressure, when the cleaning liquid is bypassing the balance tank, wherein the high pressure circuit section is connected to the main circuit section thereby forming a high pressure circuit with the main circuit while the high pressure circuit section bypasses the balance tank. one or more control valves; a flow rate arrangement configured to control a flow rate of the cleaning liquid; a balance tank configured to balance a volume of the cleaning liquid at an atmospheric pressure; and a heat exchanger configured to transfer heat to and/or from the cleaning liquid; wherein the one or more control valves, the flow rate arrangement, the balance tank and the heat exchanger are connected in series thereby forming a main circuit section, the main circuit section being configured to be connected to the liquid food processing plant thereby forming a main circuit with the liquid food processing plant, a high pressure circuit section configured to bypass the balance tank, the high pressure circuit section comprising: a further control valve configured to control the liquid flow of the cleaning liquid to bypass the balance tank, characterised in that the CIP unit further comprises a pressure arrangement configured to control a pressure of the cleaning liquid, wherein the pressure arrangement is configured to increase the pressure of the cleaning liquid above atmospheric pressure, when the cleaning liquid is bypassing the balance tank, wherein the high pressure circuit section is connected to the main circuit section thereby forming a high pressure circuit with the main circuit while the high pressure circuit section bypasses the balance tank. a further control valve configured to control the liquid flow of the cleaning liquid to bypass the balance tank, characterised in that the CIP unit further comprises a pressure arrangement configured to control a pressure of the cleaning liquid, wherein the pressure arrangement is configured to increase the pressure of the cleaning liquid above atmospheric pressure, when the cleaning liquid is bypassing the balance tank, wherein the high pressure circuit section is connected to the main circuit section thereby forming a high pressure circuit with the main circuit while the high pressure circuit section bypasses the balance tank.