Fluid separator apparatus comprising at least one cyclone (16A) for separating a fraction of less dense component(s) from predominantly fluid mixtures having at least one predominantly liquid component, said cyclone/s being provided with means defining at least one feed inlet (64), means defining at least one overflow outlet (72) for discharge of overflow comprising predominantly less dense component(s) of fluid mixtures, means defining at least one underflow outlet (66) for discharge of underflow comprising predominantly denser component(s) of said fluid mixtures, overflow conduit means (74) to receive and conduct said overflow away from said cyclone, said overflow conduit means (74) being connected securably to said overflow outlet means (72) of said cyclone (16A), support means (54) for supporting said cyclone/s in the form of a plate of pre-selected dimensions adapted to securably but releasably receive the body/bodies of said cyclone/s (16A) and receiving and transport means (78) to receive and transport said overflow away from said overflow conduit means (74) said receiving and transport means (78) being connected securably but releasably to said overflow conduit means. Additionally, said support means may form part of or be located on or within a pressure retaining vessel enclosing at least part of said cyclone/s.