An apparatus for separating solid particles from a hydrocarbon-containing fluid produced from an oil and/or gas production facility, the apparatus being adapted to be supported on a wellhead or a riser connected to a wellhead, the apparatus comprising: a conduit for conveying a hydrocarbon-containing fluid from a wellhead, the conduit being adapted to be connected to the wellhead or a riser connected to the wellhead; a solids separator in fluid communication with the conduit, the solids separator being adapted to separate solid particles from the hydrocarbon-containing fluid, the solids separator having an inlet, coupled to the conduit, for the hydrocarbon-containing fluid, a solids outlet for outputting solid particles separated by the solids separator from the hydrocarbon-containing fluid, and a fluid outlet for outputting hydrocarbon-containing fluid separated by the solids separator from the solid particles; and an output conduit, coupled to the fluid outlet, for conveying the hydrocarbon-containing fluid from the fluid outlet into a production line attached to the wellhead, characterised by the apparatus further comprising a flow adaptor which is adapted to be installed in the wellhead, wherein the flow adapter provides a first flow conduit for passage therethrough of a first flow comprising the hydrocarbon-containing fluid containing solid particles passing through the wellhead to the conduit and a second flow conduit, connected between the output conduit and the production line, for passage therethrough of a second flow comprising the hydrocarbon-containing fluid which has been separated from the solid particles, wherein the first and second flow conduits are configured to prevent mixing of the first and second flows (101, 114). a conduit for conveying a hydrocarbon-containing fluid from a wellhead, the conduit being adapted to be connected to the wellhead or a riser connected to the wellhead; a solids separator in fluid communication with the conduit, the solids separator being adapted to separate solid particles from the hydrocarbon-containing fluid, the solids separator having an inlet, coupled to the conduit, for the hydrocarbon-containing fluid, a solids outlet for outputting solid particles separated by the solids separator from the hydrocarbon-containing fluid, and a fluid outlet for outputting hydrocarbon-containing fluid separated by the solids separator from the solid particles; and an output conduit, coupled to the fluid outlet, for conveying the hydrocarbon-containing fluid from the fluid outlet into a production line attached to the wellhead, characterised by the apparatus further comprising a flow adaptor which is adapted to be installed in the wellhead, wherein the flow adapter provides a first flow conduit for passage therethrough of a first flow comprising the hydrocarbon-containing fluid containing solid particles passing through the wellhead to the conduit and a second flow conduit, connected between the output conduit and the production line, for passage therethrough of a second flow comprising the hydrocarbon-containing fluid which has been separated from the solid particles, wherein the first and second flow conduits are configured to prevent mixing of the first and second flows (101, 114).