An apparatus for converting rotation into fluid flow and/or fluid flow into rotation. The apparatus comprises a first stage including a coiled fluid conduit having an inlet and an outlet, a first fluid separator configured to receive batches of first fluid and batches of second fluid from the outlet of the coiled fluid conduit of the first stage and separate the first fluid and the second fluid, a second stage including a coiled fluid conduit having an inlet and an outlet, and a first interstage flow channel connecting the first fluid separator with the inlet of the coiled fluid conduit of the second stage for providing first fluid to the inlet of the coiled fluid conduit of the second stage.

An apparatus for converting rotation into fluid flow and/or fluid flow into rotation. The apparatus comprises a first stage including a coiled fluid conduit having an inlet and an outlet, a first fluid separator configured to receive batches of first fluid and batches of second fluid from the outlet of the coiled fluid conduit of the first stage and separate the first fluid and the second fluid, a second stage including a coiled fluid conduit having an inlet and an outlet, and a first interstage flow channel connecting the first fluid separator with the inlet of the coiled fluid conduit of the second stage for providing first fluid to the inlet of the coiled fluid conduit of the second stage.

An apparatus for converting rotation into fluid flow and/or fluid flow into rotation. The apparatus comprises a first stage including a coiled fluid conduit having an inlet and an outlet, a first fluid separator configured to receive batches of first fluid and batches of second fluid from the outlet of the coiled fluid conduit of the first stage and separate the first fluid and the second fluid, a second stage including a coiled fluid conduit having an inlet and an outlet, and a first interstage flow channel connecting the first fluid separator with the inlet of the coiled fluid conduit of the second stage for providing first fluid to the inlet of the coiled fluid conduit of the second stage.

An apparatus for converting rotation into fluid flow and/or fluid flow into rotation. The apparatus comprises a coiled fluid conduit having an inlet and an outlet, a support arrangement holding the coiled fluid conduit such that the inlet is higher/lower the outlet, a first fluid separator configured to receive batches of first fluid and batches of second fluid output from the outlet of the coiled fluid conduit and separate the first fluid and the second fluid, and an intrastage flow channel connecting the first fluid separator with the inlet of the coiled fluid conduit to allow second fluid separated by the first fluid separator to be transported back towards the inlet of the coiled fluid conduit.

An apparatus for converting rotation into fluid flow and/or fluid flow into rotation. The apparatus comprises a coiled fluid conduit having an inlet and an outlet, a support arrangement holding the coiled fluid conduit such that the inlet is higher/lower the outlet, a first fluid separator configured to receive batches of first fluid and batches of second fluid output from the outlet of the coiled fluid conduit and separate the first fluid and the second fluid, and an intrastage flow channel connecting the first fluid separator with the inlet of the coiled fluid conduit to allow second fluid separated by the first fluid separator to be transported back towards the inlet of the coiled fluid conduit.

System for transporting a liquid from a reservoir containing the liquid. The system includes a first and second conduit, each with a lower end and an upper end, a first pump, with an inlet end and an outlet end; wherein one of the lower end of the first conduit or the upper end of the second conduit is connected to a second pump; wherein a height difference between the first and second pump is within a maximum pumping height of a lower pump of the first and second pump. Further, the present invention relates to a method for operating a plurality of pumps in a system.

System for transporting a liquid from a reservoir containing the liquid. The system includes a first and second conduit, each with a lower end and an upper end, a first pump, with an inlet end and an outlet end; wherein one of the lower end of the first conduit or the upper end of the second conduit is connected to a second pump; wherein a height difference between the first and second pump is within a maximum pumping height of a lower pump of the first and second pump. Further, the present invention relates to a method for operating a plurality of pumps in a system.