A vessel for removing at least particulates from a multiple-phase fluid stream containing at least gas and entrained particulates, the vessel comprising: a fluid inlet for discharging said fluid stream generally horizontally into the vessel; an outlet tube comprising an intake opening at a bottom of the outlet tube in the vessel for receiving a particulate-free, desanded gas stream and a discharge end at the top of the outlet tube which extends out of the top of the vessel to discharge the desanded gas stream from the vessel; and characterised in that the vessel further comprises: an internal, generally upright spiral plate baffle located below the top of the vessel 102 for receiving the fluid stream from the fluid inlet and directing the fluid stream generally horizontally along an elongated flow path from the fluid inlet to the intake opening of the outlet tube, the length of said flow path being longer than the direct distance between the fluid inlet and the intake opening of the outlet tube, the baffle having an open top along the elongated flow path at an elevation above the fluid inlet, and an open bottom at an elevation below the fluid inlet, wherein the at least particulates fall through the open bottom; and wherein the intake opening of the outlet tube is within a central portion of the baffle at an elevation below the open top of the baffle wherein the intake opening of the outlet tube determines a horizontally extending freeboard interface, said freeboard interface separating a freeboard portion formed adjacent an upper portion of the vessel above the interface, for collecting the desanded gas stream, and an accumulator portion therebelow. a fluid inlet for discharging said fluid stream generally horizontally into the vessel; an outlet tube comprising an intake opening at a bottom of the outlet tube in the vessel for receiving a particulate-free, desanded gas stream and a discharge end at the top of the outlet tube which extends out of the top of the vessel to discharge the desanded gas stream from the vessel; and characterised in that the vessel further comprises: an internal, generally upright spiral plate baffle located below the top of the vessel 102 for receiving the fluid stream from the fluid inlet and directing the fluid stream generally horizontally along an elongated flow path from the fluid inlet to the intake opening of the outlet tube, the length of said flow path being longer than the direct distance between the fluid inlet and the intake opening of the outlet tube, the baffle having an open top along the elongated flow path at an elevation above the fluid inlet, and an open bottom at an elevation below the fluid inlet, wherein the at least particulates fall through the open bottom; and wherein the intake opening of the outlet tube is within a central portion of the baffle at an elevation below the open top of the baffle wherein the intake opening of the outlet tube determines a horizontally extending freeboard interface, said freeboard interface separating a freeboard portion formed adjacent an upper portion of the vessel above the interface, for collecting the desanded gas stream, and an accumulator portion therebelow. an internal, generally upright spiral plate baffle located below the top of the vessel 102 for receiving the fluid stream from the fluid inlet and directing the fluid stream generally horizontally along an elongated flow path from the fluid inlet to the intake opening of the outlet tube, the length of said flow path being longer than the direct distance between the fluid inlet and the intake opening of the outlet tube, the baffle having an open top along the elongated flow path at an elevation above the fluid inlet, and an open bottom at an elevation below the fluid inlet, wherein the at least particulates fall through the open bottom; and wherein the intake opening of the outlet tube is within a central portion of the baffle at an elevation below the open top of the baffle wherein the intake opening of the outlet tube determines a horizontally extending freeboard interface, said freeboard interface separating a freeboard portion formed adjacent an upper portion of the vessel above the interface, for collecting the desanded gas stream, and an accumulator portion therebelow.