A door assembly for a pressure vessel includes a door, a hub to attach to the pressure vessel and to receive the door, and an annular seal to seal between the door and the hub. A hinge arm is coupled to the hub and to the door and is able to pivot relative to the hub about a hinge axis. A door actuator having an elongate member extending along an actuator axis is spaced-apart from the hinge axis and coupled to the hub and to the hinge arm. The elongate member travels with the hinge arm when the arm pivots relative to the hub, and rotates about the actuator axis. The door actuator is configured to cause the seal to engage sealingly the hub and the door.

Device (1) for closed systems for equalization of pressure surges, having an outlet nozzle (2), on which an impact plate (3) is provided and a hinged cover (4) is mounted pivotably, wherein the hinged cover (4) lies in a rest position (5) on the outlet nozzle (2) and in an open position (6) bears on the impact plate (3), wherein at least one holding-closed device (7) is provided, which presses the hinged cover (4) in the rest position (5) against the outlet nozzle (2) and in the case of a pressure surge releases the hinged cover (4), wherein the device has a control unit (8) that controls the holding-closed device (7).

Device (1) for closed systems for equalization of pressure surges, having an outlet nozzle (2), on which an impact plate (3) is provided and a hinged cover (4) is mounted pivotably, wherein the hinged cover (4) lies in a rest position (5) on the outlet nozzle (2) and in an open position (6) bears on the impact plate (3), wherein at least one holding-closed device (7) is provided, which presses the hinged cover (4) in the rest position (5) against the outlet nozzle (2) and in the case of a pressure surge releases the hinged cover (4), wherein the device has a control unit (8) that controls the holding-closed device (7).

Apparatus to protect sealing surfaces of thief hatches are disclosed. An example apparatus includes a first portion that is attachable to a tank, wherein the first portion includes a first opening, and a second portion that is pivotably coupled to the first portion. The example apparatus is structured to provide access to an aperture in the tank via the first opening when the second portion is in an open state and maintain a pressure of the tank within a specified range by selectively separating one or more seals from one or more corresponding sealing surfaces when the second portion is in a closed state, wherein the second portion includes the one or more seals and the one or more corresponding sealing surfaces.

Apparatus to protect sealing surfaces of thief hatches are disclosed. An example apparatus includes a first portion that is attachable to a tank, wherein the first portion includes a first opening, and a second portion that is pivotably coupled to the first portion. The example apparatus is structured to provide access to an aperture in the tank via the first opening when the second portion is in an open state and maintain a pressure of the tank within a specified range by selectively separating one or more seals from one or more corresponding sealing surfaces when the second portion is in a closed state, wherein the second portion includes the one or more seals and the one or more corresponding sealing surfaces.

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.

A vacuum system for use in excavation operations. The system uses a tank having an open end that is closed by a door. The door is opened and closed by a door lifting assembly made up of an upper linkage arm, a lower linkage arm and a hydraulic cylinder. A socket is formed in the upper linkage arm, and a shaft housing is formed in the lower linkage arm. The shaft housing engages with the socket to latch the door closed. The upper linkage arm is attached to the door at a first pivot axis and is attached to the lower linkage arm at a second pivot axis. The lower linkage arm is attached to a side of the tank at a third pivot axis. When the door is open, the second pivot axis extends below a reference plane that contains the first and third pivot axis.

A vacuum system for use in excavation operations. The system uses a tank having an open end that is closed by a door. The door is opened and closed by a door lifting assembly made up of an upper linkage arm, a lower linkage arm and a hydraulic cylinder. A socket is formed in the upper linkage arm, and a shaft housing is formed in the lower linkage arm. The shaft housing engages with the socket to latch the door closed. The upper linkage arm is attached to the door at a first pivot axis and is attached to the lower linkage arm at a second pivot axis. The lower linkage arm is attached to a side of the tank at a third pivot axis. When the door is open, the second pivot axis extends below a reference plane that contains the first and third pivot axis.

A davit system has a davit arm and a davit mount. The davit mount includes a mount body, a clamping mechanism for clamping the corner flange of the air conditioning unit, and an arm mounting element for pivotally mounting the davit arm on the davit mount. When the mount body is mounted on the corner flange of the air conditioning unit, the davit arm extends laterally over the head of the air conditioning unit, and pivots away from the air conditioning unit for removing the head during servicing.