Abstract: A closure safety interlock system is provided for a pressure vessel having a closure assembly with a primary locking system. The closure safety interlock defines a secondary locking system for assuring that the primary locking system may be opened only by following a proper sequence, thereby minimizing misuse of the primary locking system. The closure safety interlock includes a blocking member movable between an engaged position and a disengaged position for blocking movement of a primary lock when in the engaged position and until a release mechanism in the primary lock has been activated. A mechanism is provided for moving the blocking member from the engaged position to the disengaged position once the release mechanism has been activated. A locking plate is movable between a locked and closed position for prohibiting access to the blocking member and an open position for gaining access to the blocking member.

Abstract: A ladder assembly defines a work station for a tank having a vertically extending side wall and a top of a convex curved profile, with an access point near the top center of the convex curved top, the ladder having a pair of parallel side rails, each side rail having a straight section at one end and a curved section at the other end, the curved section extending over the top of the tank and toward the access point, with plurality of rungs extending between and secured to the side rails, with at least one rung positioned in the straight section of the side rails and at least one rung positioned in the curved section of the side rails. A separate hand grip is provided and may be mounted on the tank between the ladder and the access point of the tank.

Abstract: A cover assembly for an access opening in a pressure vessel is held in sealing position at least partially by the positive pressure in the pressure vessel by engaging an interior wall of the pressure vessel when the pressure vessel is under pressure. A peripheral rim on the housing is adapted for engaging the interior wall of the pressure vessel, and positioning tabs on the housing engage and position the housing and the peripheral rim relative to the access opening in the pressure vessel.

Abstract: A ladder is designed for a tank having a vertically extending side wall and a top of a convex curved profile, with an access point near the top center of the convex curved top, the ladder having a pair of parallel side rails, each side rail having a straight section at one end and a curved section at the other end, the curved section extending over the top of the tank and toward the access point, with plurality of rungs extending between and secured to the side rails, with at least one rung positioned in the straight section of the side rails and at least one rung positioned in the curved section of the side rails.

Abstract: A closure safety interlock system is provided for a pressure vessel having a closure assembly with a primary locking system. The closure safety interlock defines a secondary locking system for assuring that the primary locking system may be opened only by following a proper sequence, thereby minimizing misuse of the primary locking system. The closure safety interlock includes a blocking member movable between an engaged position and a disengaged position for blocking movement of a primary lock when in the engaged position and until a release mechanism in the primary lock has been activated. A mechanism is provided for moving the blocking member from the engaged position to the disengaged position once the release mechanism has been activated. A locking plate is movable between a locked and closed position for prohibiting access to the blocking member and an open position for gaining access to the blocking member.

Abstract: A hopper system for both delivery and reclamation of bulk abrasives includes a closed, vacuum rated container with an inlet port with a hatch which is moveable between an open position for gaining access to the interior of the container and a closed position for closing the container. At its lower end there is an outlet port for releasing the contents of the container. The outlet port includes a valve which is moveable between open and closed positions for controlling the flow of contents from the container. The hopper system includes a connector for attaching a vacuum source to the container and in communication with the interior of the container and a reclamation inlet in the container and communicating with a reclamation line for drawing abrasives into the interior of the container when the vacuum source is attached to the container.

Abstract: A ladder is designed for a tank having a vertically extending side wall and a top of a convex curved profile, with an access point near the top center of the convex curved top, the ladder having a pair of parallel side rails, each side rail having a straight section at one end and a curved section at the other end, the curved section extending over the top of the tank and toward the access point, with plurality of rungs extending between and secured to the side rails, with at least one rung positioned in the straight section of the side rails and at least one rung positioned in the curved section of the side rails. A separate hand grip may be mounted on the tank between the ladder and the access point of the tank.

Abstract: A ladder is designed for a tank having a vertically extending side wall and a top of a convex curved profile, with an access point near the top center of the convex curved top, the ladder having a pair of parallel side rails, each side rail having a straight section at one end and a curved section at the other end, the curved section extending over the top of the tank and toward the access point, with plurality of rungs extending between and secured to the side rails, with at least one rung positioned in the straight section of the side rails and at least one rung positioned in the curved section of the side rails.

Abstract: A ladder is designed for a tank having a vertically extending side wall and a top of a convex curved profile, with an access point near the top center of the convex curved top, the ladder having a pair of parallel side rails, each side rail having a straight section at one end and a curved section at the other end, the curved section extending over the top of the tank and toward the access point, with plurality of rungs extending between and secured to the side rails, with at least one rung positioned in the straight section of the side rails and at least one rung positioned in the curved section of the side rails.

Abstract: A hopper system for both delivery and reclamation of bulk abrasives includes a closed, vacuum rated container with an inlet port with a hatch which is moveable between an open position for gaining access to the interior of the container and a closed position for closing the container. At its lower end there is an outlet port for releasing the contents of the container. The outlet port includes a valve which is moveable between open and closed positions for controlling the flow of contents from the container. The hopper system includes a connector for attaching a vacuum source to the container and in communication with the interior of the container and a reclamation inlet in the container and communicating with a reclamation line for drawing abrasives into the interior of the container when the vacuum source is attached to the container.

Abstract: A closure safety interlock system is provided for a pressure vessel having a closure assembly with a primary locking system. The closure safety interlock defines a secondary locking system for assuring that the primary locking system may be opened only by following a proper sequence, thereby minimizing misuse of the primary locking system. The closure safety interlock includes a blocking member movable between an engaged position and a disengaged position for blocking movement of a primary lock when in the engaged position and until a release mechanism in the primary lock has been activated. A mechanism is provided for moving the blocking member from the engaged position to the disengaged position once the release mechanism has been activated.