This type of system allows to recover and therefore recirculate a part of the service liquid, whether it comes from the process or it is fed by a closed circuit dedicated to this service. The remaining part of the service liquid that is necessary for the correct pump functioning comes from an external source. The liquid mixture got from the two sources must have a suitable temperature for the proper pump functioning. The below P&I refers to a typical full-optional system with recirculation of the service liquid from a dedicated closed circuit. There is also the possibility to engineer its parts following the customer’s requests. The system can be entirely supplied including the control panel or, as alternative, it is possible to require only the necessary components.