A railway tank car including a protective structure for the top of its cargo tank and surrounding both a valve group mounting nozzle and a pressure-relief safety valve nozzle, to protect the associated valves against damage resulting from the car being overturned, particularly while the railcar is m
A railway tank car including a protective structure for the top of its cargo tank and surrounding both a valve group mounting nozzle and a pressure-relief safety valve nozzle, to protect the associated valves against damage resulting from the car being overturned, particularly while the railcar is moving along a railway. The protective structure includes protective housings including upstanding walls of metal plate construction surrounding the nozzles yet not attached directly to the nozzles, so that the protective housings afford convenient access to the valves associated with the nozzles.
대표청구항▼
1. A railway tank car comprising: (a) a cargo tank for containing fluid cargo and having a tank wall of an elongate, generally cylindrical configuration including a vertical longitudinal central plane, a pair of opposite ends, and a tank top, the tank wall having an exterior surface and an interior
1. A railway tank car comprising: (a) a cargo tank for containing fluid cargo and having a tank wall of an elongate, generally cylindrical configuration including a vertical longitudinal central plane, a pair of opposite ends, and a tank top, the tank wall having an exterior surface and an interior surface;(b) a first opening defined through the tank wall at the tank top of the cargo tank;(c) a flange attachment skirt located within the first opening and extending through and around the first opening and upward above the tank top to a planar upper margin of the flange attachment skirt, the flange attachment skirt having an interior surface adjacent its planar upper margin;(d) an annular valve group mounting flange having an upper surface and a bottom surface spaced apart from the upper surface by a flange thickness, the mounting flange being located within the flange attachment skirt and being fastened to the interior surface of the flange attachment skirt;(e) a valve group and fittings mounting plate;(f) a plurality of mechanical fasteners attaching the mounting plate to the upper surface of the flange; and(g) a protective structure attached to the tank top and surrounding the first opening and the valve group mounting flange. 2. The railway tank car of claim 1, the tank top including a doubler plate, and the protective structure including a protective housing including an upstanding wall of metal plate material attached to the tank top, surrounding the first opening defined through the tank wall, and spaced radially outwardly apart from the flange attachment skirt. 3. The railway tank car of claim 2, including a pressure-relief valve and a pressure-relief valve nozzle at a separately located second opening spaced apart from the first opening in a longitudinal direction with respect to the cargo tank, and wherein the upstanding wall of the protective housing has a lower margin welded to the doubler plate, the protective structure also including an auxiliary protective housing for the pressure-relief valve in the form of an upstanding wall of metal plate material spaced apart radially outward from the pressure-relief valve nozzle and having a pair of opposite side portions, each attached to the upstanding wall of the protective housing and extending on opposite lateral sides of the pressure-relief valve nozzle, and a portion interconnecting the side portions and extending around the pressure-relief valve nozzle. 4. The railway tank car of claim 1 including a separate pressure-relief valve nozzle at a separately located second opening spaced apart from the first opening in a longitudinal direction with respect to the cargo tank, the tank car further including a reinforcing pad including a doubler plate attached to the tank top of the cargo tank, extending in the longitudinal direction with respect to the cargo tank and surrounding the first opening, the separately located second opening through the tank wall, and the pressure-relief valve nozzle. 5. A protective structure for protecting a nozzle and a tank top part of a fluid cargo tank including a first opening, a valve group nozzle, and a valve mounting plate covering the first opening, and including a second opening and a pressure-relief valve nozzle mounted on the tank top and spaced apart longitudinally of the cargo tank from the first opening, the protective structure comprising: (a) a nozzle reinforcement pad including a doubler plate attached to the tank top and surrounding the first opening, the doubler plate extending to the second opening and surrounding the second opening and the pressure-relief valve nozzle;(b) a protective housing including an upstanding wall of metal plate material surrounding the first opening and the valve mounting plate and having a lower margin welded to the doubler plate; and(c) an auxiliary protective housing for the pressure-relief valve nozzle, attached to the nozzle reinforcement pad and including an upstanding wall of metal plate material, the upstanding wall of the auxiliary protective housing having a pair of opposite side portions each attached to the upstanding wall of the protective housing surrounding the first opening and extending on opposite lateral sides of the pressure-relief valve nozzle and having a portion interconnecting the side portions and extending around the pressure-relief valve nozzle. 6. The protective structure of claim 5 wherein the protective housing includes a reinforcing doubler plate welded to the upstanding wall surrounding the first opening, the reinforcing doubler plate being located upwardly adjacent to the nozzle reinforcement pad and facing toward an end of the fluid cargo tank. 7. A railway tank car comprising: (a) a cargo tank for containing fluid cargo and having an elongate generally cylindrical configuration including a pair of opposite ends and a tank top;(b) a first opening defined in the tank top of the cargo tank and a smaller second opening defined in the tank top and spaced a distance apart from the first opening;(c) a valve group nozzle communicating with an interior of the cargo tank and extending through the first opening and having a portion located above the tank top;(d) a closure member associated with the valve group nozzle;(e) a protective housing attached to the top of the cargo tank, the protective housing being spaced apart from and surrounding the valve group nozzle and the associated closure member, the protective housing including a first upstanding wall of metal plate construction;(f) a pressure-relief safety valve connected with the tank top and communicating with the interior of the cargo tank through the second opening defined in the tank top;(g) an auxiliary protective housing attached to the tank top and to the first upstanding wall of the protective housing, the auxiliary protective housing including a second upstanding wall of metal plate construction having a pair of ends, spaced apart from each other laterally of the car and attached to the first upstanding wall of the protective housing, and having an intermediate portion, spaced apart from the first upstanding wall and interconnecting the ends of the second upstanding wall and extending around the pressure-relief safety valve, the second upstanding wall having a lower margin attached to the top of the cargo tank, and the second upstanding wall defining an upwardly-open space surrounding the pressure-relief safety valve. 8. The railway tank car of claim 7 wherein the valve group nozzle includes a flange attachment skirt located within the first opening and extending through the first opening and upward above the tank top to an upper margin, the flange attachment skirt having an interior surface adjacent its upper margin, and the tank car including an annular valve group mounting flange having a horizontal upper surface and a bottom surface spaced apart from the upper surface by a flange thickness, the valve group mounting flange extending radially inward within the flange attachment skirt and having an upper margin fastened to the interior surface of the flange attachment skirt adjacent the upper margin thereof. 9. The railway tank car of claim 8 wherein the valve group mounting flange has a bottom surface attached to the interior surface of the flange attachment skirt and has at least a portion of its bottom surface located no higher than an interior surface of a tank wall of the cargo tank. 10. The railway tank car of claim 7 further including a nozzle reinforcement pad in the form of a doubler plate welded to an exterior surface of the tank top and extending around and between the first opening and the second opening in the tank top.
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