Cyclonic separator

A multiphase metering device comprising a vessel, a first stage cyclone separator within said vessel including a first separation chamber having an inlet for mixture of fluids of differing densities to be separated, an underflow outlet for a more dense fluid phase separated from said mixture, and an overflow outlet for a less dense fluid phase separated from said mixture, said overflow outlet of said first cyclone separator discharging said less dense fluid phase in use into a second chamber within said vessel, and including a vortex finder and means for deflecting the flow which issues from the vortex finder to promote separation therefrom of any entrained more dense phase, whereby said overflow outlet and said second chamber define a second stage cyclone separator, said second chamber having a less dense fluid phase outlet, and the device including first means for measuring the less dense fluid phase issuing from said less dense fluid phase outlet and second means for measuring the total of the more dense fluid phase leaving the underflow outlet of the first chamber and the more dense fluid phase collected in the second chamber.

A cyclonic separator for separating the phases of a three phase mixture of components of differing densities including a more dense phase, an intermediate density phase and a less dense phase, comprising a vessel having a common outer wall enclosing a first stage cyclone separator including a first separation chamber having an inlet for the mixture to be separated, an underflow outlet for a second mixture of the more dense phase and the intermediate density phase separated from said three phase mixture, and an overflow outlet for the less dense phase separated from said three phase mixture, said overflow outlet of said first cyclone separator discharging said less dense phase into a second chamber, and including a vortex finder and means for deflecting the flow which issues from the vortex finder to promote separation therefrom of any entrained more dense phase, whereby said overflow outlet and said second chamber define a second stage cyclone separator, said second chamber having a less dense phase outlet, said first stage underflow passing to a further separation stage where the more dense phase separates from the intermediate density phase and is collected under gravity, the intermediate density phase flowing through an intermediate density phase outlet.