Pump arrangement with two pump units, system, use and method

A pumping arrangement system comprising:

• a continuous chemical reactor;
• a pump arrangement for pumping fluids, comprising at least a first and a second pump unit, each pump unit comprising:
• a pumping cylinder,
• a reciprocally movable pumping piston in said pumping cylinder, said pumping piston delimiting a pumping chamber in the pumping cylinder, said pumping chamber being in communication with one or more pump ports for the fluids to be pumped,
• a pneumatic actuator connected to the pumping piston and operated by control valves for moving said pumping piston, and
• a transducer for determining a value dependent on the continuous position of the pumping piston in the pumping cylinder,
• said pump arrangement further comprises:
• a set of inlet valves connecting each pump unit to a source line and a set of delivery valves connecting each pump unit to a delivery line,
• a regulating valve positioned in the delivery line downstream from the delivery valves,
• at least one regulating unit for regulating the force applied to respective pumping pistons via the control valves, and
• a control unit configured to send and receive signals for regulating the volume of the flow of the fluids to be pumped from each pump unit, the control unit controlling operation of the control valves of each pump unit as well as the at least one regulating unit, the control unit also being configured to control the regulating valve for regulating the flow from the pump units;
• wherein the delivery line is connected to a continuous chemical reactor port.