A railroad car hatch cover assembly including a replaceable combined hatch cover protector and gasket that can be quickly and easily mounted to a hatch cover of the vented hatch cover assembly and easily and quickly removed therefrom. In certain embodiments, the combined hatch cover protector and gasket includes an outer sealing member configured to be positioned in a pocket of the hatch cover, an inner protector element holder, a protector element held by and secured to the protector element holder, and a dual connector connecting the outer sealing member and the inner protector element holder, and configured to partially facilitate connection to the hatch cover.

A railroad car hatch cover assembly including a replaceable combined hatch cover protector and gasket that can be quickly and easily mounted to a hatch cover of the vented hatch cover assembly and easily and quickly removed therefrom. In certain embodiments, the combined hatch cover protector and gasket includes an outer sealing member configured to be positioned in a pocket of the hatch cover, an inner protector element holder, a protector element held by and secured to the protector element holder, and a dual connector connecting the outer sealing member and the inner protector element holder, and configured to partially facilitate connection to the hatch cover.

A vent structure for large volume liquid storage tanks having a double gooseneck shape with vent openings facing downward, formed as a single structure from a mold tool with multipart extractable cores for forming the structure from corrosive resistant materials without a need for substantial post machining.

A vent structure for large volume liquid storage tanks having a double gooseneck shape with vent openings facing downward, formed as a single structure from a mold tool with multipart extractable cores for forming the structure from corrosive resistant materials without a need for substantial post machining.

A vent valve includes an outer frame, a ventilation box movable in the outer frame, a sealing cover, a buoyant box and elongate sliding members. The ventilation box has an interior space. The sealing cover has a cover opening, and closes/opens a surrounding space defined by the ventilation box and the outer frame. The buoyant box is disposed within the interior space. When the buoyant box abuts the sealing cover and closes the cover opening, the cover opening is disconnected from the interior space. When the buoyant box moves away from the sealing cover, the interior space communicates the cover opening. The sliding members slidingly contact the outer frame and ventilation box to guide sliding movements.

A vent valve includes an outer frame, a ventilation box movable in the outer frame, a sealing cover, a buoyant box and elongate sliding members. The ventilation box has an interior space. The sealing cover has a cover opening, and closes/opens a surrounding space defined by the ventilation box and the outer frame. The buoyant box is disposed within the interior space. When the buoyant box abuts the sealing cover and closes the cover opening, the cover opening is disconnected from the interior space. When the buoyant box moves away from the sealing cover, the interior space communicates the cover opening. The sliding members slidingly contact the outer frame and ventilation box to guide sliding movements.

A bulk fluid storage container has a top wall structure and a bottom wall structure held in spaced relation by a side wall structure. An internal baffle assembly is disposed in the fluid storage volume between the side wall structure for reducing fluid sloshing. A fill port formed in the top wall structure has a fill flange for coupling with a source of the fluid. A vent port formed in the top wall structure has a pressure vacuum value. A drain port formed in the side wall structure in a lower region adjacent the gutter region has a drain valve assembly is coupled to the drain port. A frame assembly includes an upper rectangular frame member and a lower rectangular frame member arranged in spaced relation by a plurality of post; wherein the frame assembly surrounds and supports the fluid storage vessel.

A bulk fluid storage container has a top wall structure and a bottom wall structure held in spaced relation by a side wall structure. An internal baffle assembly is disposed in the fluid storage volume between the side wall structure for reducing fluid sloshing. A fill port formed in the top wall structure has a fill flange for coupling with a source of the fluid. A vent port formed in the top wall structure has a pressure vacuum value. A drain port formed in the side wall structure in a lower region adjacent the gutter region has a drain valve assembly is coupled to the drain port. A frame assembly includes an upper rectangular frame member and a lower rectangular frame member arranged in spaced relation by a plurality of post; wherein the frame assembly surrounds and supports the fluid storage vessel.

According to some embodiments, a pressure relief valve system comprises a valve body coupled to a pressure chamber. The valve body defines a vapor flow path between the pressure chamber and the atmosphere. A valve orifice in the valve body is configured to allow vapor to flow between the pressure chamber and the valve body. A vapor conduit comprises a vapor conduit first end coupled to the valve orifice and a second end opening into the pressure chamber. The vapor conduit forms a passageway between the vapor conduit first and second end. The vapor conduit also comprises a vapor conduit orifice near its first end. The vapor conduit orifice is configured to allow the vapor to flow from the pressure chamber into the vapor conduit. A gravity-operated valve positioned near the vapor conduit first end is configured to control the flow of vapor through the vapor conduit orifice.

According to some embodiments, a pressure relief valve system comprises a valve body coupled to a pressure chamber. The valve body defines a vapor flow path between the pressure chamber and the atmosphere. A valve orifice in the valve body is configured to allow vapor to flow between the pressure chamber and the valve body. A vapor conduit comprises a vapor conduit first end coupled to the valve orifice and a second end opening into the pressure chamber. The vapor conduit forms a passageway between the vapor conduit first and second end. The vapor conduit also comprises a vapor conduit orifice near its first end. The vapor conduit orifice is configured to allow the vapor to flow from the pressure chamber into the vapor conduit. A gravity-operated valve positioned near the vapor conduit first end is configured to control the flow of vapor through the vapor conduit orifice.