Abstract: A marine wet exhaust system (10) which injects water into the exhaust flow for cooling and attenuating noise includes a particulate capture and containment system (14) for removing particulates and fluid contaminants from the exhaust gas and the waste cooling water of the discharge. With a first embodiment, this is accomplished by separating the waste cooling water and entrained particulates from the exhaust gas in a muffler/separator (912); accumulating the waste cooling water and entrained particulates in a reservoir (52); and separating the entrained particulates from the waste cooling water in a filter (50). The system further includes a reservoir discharge pump assembly (54), a reservoir drain line (86) and a bleed line (74) to maintain water levels in the reservoir and the filter. With a second embodiment, a condensate trap (56) separates particulates and condensates from the de-watered exhaust gas and returns them to the reservoir (52).

Abstract: The invention relates to a marine wet exhaust system and a method for treating the exhaust from a marine engine. The system comprises a first conduit for receiving an exhaust flow including gaseous, liquid and particulate solid components, a separator for separating the liquid and particulate components from gaseous component, and a second conduit for expelling the gaseous component. A third conduit is provided for receiving from the separator the liquid and particulate solid components, which then pass to a filter for separating the particulate solid component from the liquid component, and the liquid component is discharged via a fourth conduit.

Abstract: A wet marine exhaust muffler includes a metallic housing and a polymeric jacket substantially encapsulating the metallic housing. The metallic housing defines one or more chambers in the interior of the housing. An inlet pipe and an outlet pipe each extend through openings in the polymeric jacket and communicate with at least one chamber in the interior of the housing. The metallic housing is preferably formed from stainless steel and the polymeric jacket is preferably formed from a thermoplastic material having a thickness of approximately 0.001 inch to 0.1 inch, and more preferably of approximately 0.005 inch to 0.060 inch.

Abstract: A combined wet marine exhaust muffler and water separator comprises a housing having a tangential inlet for inducing the exhaust flow to rotate about a lengthwise axis of the housing, a first outlet positioned along the axis for conducting dried exhaust gas from the housing, and a second outlet positioned near a bottom end of the housing and spaced from the tangential inlet and the first outlet for draining water from the housing.

Abstract: A wet marine exhaust muffler comprises a housing, an inlet pipe and an outlet pipe. The housing includes end walls each transverse with respect to an imaginary plane and converging side walls connecting converging edges of the end walls such that the converging side walls are symmetrical with respect to the imaginary plane. The inlet pipe extends through a first of the end walls, while the outlet pipe extends through a second of the end walls. Preferably, the converging side walls of the housing are so dimensioned as to conform to a converging lower hull portion of a boat to minimize the space occupied by the wet marine exhaust muffler. In an especially preferred form of the invention, at least one of the pipes in the wet marine exhaust muffler includes a notched upstream end portion and a cap positioned against the upstream end portion to define a radial opening to impart a swirling type vector to the flow as it enters the pipe.