It was mainly used to dredge Gloucester Docks and the Sharpness canal to a depth of 16ft and to dredge the dock at Sharpness to 24ft. At times SND No.4 also worked in the entrance and tidal basin at Sharpness. These operations typically removed 35,000 to 40,000 tons of mud from the canal and docks each year until 1981, when SND No.4 was replaced by a diesel-electric powered dredger. It is now a working exhibit in the Gloucester Waterways Museum.