Apparatus to protect sealing surfaces of thief hatches are disclosed. An example apparatus includes a base attachable to a tank around an aperture in the tank. The example apparatus further includes a spacer supported by a support surface of the base. The example apparatus also includes a cover selectively moveable between a closed position covering the aperture and an open position providing access to the aperture, the spacer separating the cover from the base.

Apparatus to protect sealing surfaces of thief hatches are disclosed. An example apparatus includes a base attachable to a tank around an aperture in the tank. The example apparatus further includes a spacer supported by a support surface of the base. The example apparatus also includes a cover selectively moveable between a closed position covering the aperture and an open position providing access to the aperture, the spacer separating the cover from the base.

Apparatus to protect sealing surfaces of thief hatches are disclosed. An example apparatus includes a base attachable to a tank around an aperture in the tank. The example apparatus further includes a spacer supported by a support surface of the base. The example apparatus also includes a cover selectively moveable between a closed position covering the aperture and an open position providing access to the aperture, the spacer separating the cover from the base.

Apparatus to protect sealing surfaces of thief hatches are disclosed. An example apparatus includes a base attachable to a tank around an aperture in the tank. The example apparatus further includes a spacer supported by a support surface of the base. The example apparatus also includes a cover selectively moveable between a closed position covering the aperture and an open position providing access to the aperture, the spacer separating the cover from the base.

A gasket for sealing between the open end of a manway nozzle body of a containment vessel and an associated cover comprising a resilient annular ring member having a bail including a plurality of rigid arcuate inserts spaced about the bail that extends between radially inner and radially outer depending legs. The bail includes at least one annular upstanding chevron extending about an upper surface and at least one annular depending chevron extending about a lower surface. The inserts and bail have about the same thickness. A method includes compressing the gasket between the manway nozzle and cover, and the rigid inserts limit the compression of the gasket.

A gasket for sealing between the open end of a manway nozzle body of a containment vessel and an associated cover comprising a resilient annular ring member having a bail including a plurality of rigid arcuate inserts spaced about the bail that extends between radially inner and radially outer depending legs. The bail includes at least one annular upstanding chevron extending about an upper surface and at least one annular depending chevron extending about a lower surface. The inserts and bail have about the same thickness. A method includes compressing the gasket between the manway nozzle and cover, and the rigid inserts limit the compression of the gasket.

Disclosed is a closure for ducts or receptacles for pressurized fluids, including an annular supporting structure (10), which defines an opening (11) for accessing the duct or receptacle, and a hatch (30), connected in an articulated manner to the supporting structure (10), with the ability to move between a closed position and an open position, wherein the supporting structure (10) includes a sealing surface (13), characterized in that it includes a sealing element (20) that can be positioned in the opening (11), the sealing element (20) including an expansible portion (21) with an inner surface (24) facing the duct and an outer surface (23) facing the sealing surface (13), the expansible portion (21) being able to expand as a result of the pressure of the fluid that acts on the inner surface (24) so that the outer surface (24) is placed in contact with the sealing surface (13).

The invention relates to a melter, comprising a block (2) having a detachable shell (6), in which there is housed a melting chamber (3) provided with an upper opening that is closed with a hinged and detachable lid (11), the chamber (3) being arranged on lower supports (7), with the freedom to expand upwards, the opening of said chamber (3) incorporating a gasket (8) having an upwardly inclined flexible lip in the outer part on which the shell (6) rests, establishing sealed closure with respect to the chamber (3), whereas on the gasket (8) there is arranged a frame (9) having an upward vertical flange, with respect to which the lid (11) that closes on the gasket (8) is assembled, such that when the chamber (3) expands due to the temperature, the flexible lip allows the expansion maintaining leak-tightness.

The invention relates to a melter, comprising a block (2) having a detachable shell (6), in which there is housed a melting chamber (3) provided with an upper opening that is closed with a hinged and detachable lid (11), the chamber (3) being arranged on lower supports (7), with the freedom to expand upwards, the opening of said chamber (3) incorporating a gasket (8) having an upwardly inclined flexible lip in the outer part on which the shell (6) rests, establishing sealed closure with respect to the chamber (3), whereas on the gasket (8) there is arranged a frame (9) having an upward vertical flange, with respect to which the lid (11) that closes on the gasket (8) is assembled, such that when the chamber (3) expands due to the temperature, the flexible lip allows the expansion maintaining leak-tightness.

Disclosed is a closure for ducts or receptacles for pressurized fluids, including an annular supporting structure (10), which defines an opening (11) for accessing the duct or receptacle, and a hatch (30), connected in an articulated manner to the supporting structure (10), with the ability to move between a closed position and an open position, wherein the supporting structure (10) includes a sealing surface (13), characterized in that it includes a sealing element (20) that can be positioned in the opening (11), the sealing element (20) including an expansible portion (21) with an inner surface (24) facing the duct and an outer surface (23) facing the sealing surface (13), the expansible portion (21) being able to expand as a result of the pressure of the fluid that acts on the inner surface (24) so that the outer surface (24) is placed in contact with the sealing surface (13).