Abstract: This disclosure relates to a pump system for handling a slurry medium, the pump system comprising a pump unit (101) consisting of at least two reciprocating positive displacement slurry pumps, both pumps being arranged for alternating intake of slurry medium via a slurry suction inlet (103) and discharge of slurry medium via a slurry discharge outlet (103); a pump drive unit (104) for driving the at least two reciprocating positive displacement pumps of said pump unit; as well as a slurry damping pump unit (105) for damping discharge pulsations in the slurry medium being pumped.

Abstract: This disclosure relates to a pump system for handling a slurry medium, the pump system comprising a pump unit (101) consisting of at least two reciprocating positive displacement slurry pumps, both pumps being arranged for alternating intake of slurry medium via a slurry suction inlet (103) and discharge of slurry medium via a slurry discharge outlet (103); a pump drive unit (104) for driving the at least two reciprocating positive displacement pumps of said pump unit; as well as a slurry damping pump unit (105) for damping discharge pulsations in the slurry medium being pumped.

Abstract: A pump system using multiple reciprocating positive displacement pumps which phase shift is controlled by a phase shift controller. The phase shift controller uses a virtual master pump inside the phase shift controller which is used as a phase reference against which the phase shifts of the individual pumps is calculated. The phase shift controller adjusts the speed reference set-point for the variable speed drives of the individual pumps such that a desired phase shift is obtained and maintained. The operation of multiple reciprocating pumps using phase shift control can significantly reduce the pressure pulsation levels in the pump system. The use of a virtual master pump eliminates master slave scheduling and increases system reliability and availability as the operating of the phase control is not depending on the reliability of a real master pump.