A manhole cover and a manhole management system are provided. A manhole cover according to one embodiment includes: a cover body; an electronic unit including at least one sensing unit configured to sense information inside a manhole and at least one communication module configured to transmit information which is obtained through the sensing unit to the outside, and embedded in the cover body; a battery providing driving power to the electronic unit; and a wireless power reception antenna embedded in the cover body to receive wireless power supplied from the outside and provide the wireless power to the battery.

A fractionation tray includes a manway unit positioned to cover a manway opening in the fractionation tray. The manway opening is framed by one or more fractionation tray panels having apertures therethrough adjacent to the manway opening. The manway unit includes a first manway panel having: perforations for the passage of fluid; first and second opposing side edges and two opposing end edges; and finger elements extending from the second side edge. The finger elements of the second side edge are received within the apertures adjacent to a first side of the manway opening. The manway unit is configured to open and close by rotation of the finger elements within the apertures.

In one embodiment, an electronically controlled hatch system for safe ingress, egress, hazard detection, and methods thereof are provided to reduce or eliminate hazards to personnel, including protection of people above and below a scuttle hatch, access port, skylight or elevated deck. Said hatch system reduces the risk of falls while ascending or descending a ladder through an access port. In certain embodiments, severe weather, hazard, security, and other safety information are detected and transmitted to a central control unit for processing and regulating the opening and closing of a hatch covering the access port and/or raising and lowering a safety railing system based on said information and/or user input. Said hatch system may include an actuator and guides for automatically locking/unlocking and opening/closing a hatch, an actuator and guides for automatically raising/lowering a railing system, safety monitoring detectors/apparatuses, and a centralized controller.

An exterior elevated assembly with a walking surface is described which has features for facilitating inspection of the interior support frame of the assembly. The assembly includes a support frame for the walking surface, which defines an interior space and a soffit covering an underside of the support frame. The soffit provided with an opening. A vent panel is provided for covering the opening and a vent panel retention mechanism is provided for reversibly holding the vent panel in place over the opening. Methods and kits for installing a vent panel in a soffit of an exterior elevated assembly with a walking surface are also described.

An exterior elevated assembly with a walking surface is described which has features for facilitating inspection of the interior support frame of the assembly. The assembly includes a support frame for the walking surface, which defines an interior space and a soffit covering an underside of the support frame. The soffit provided with an opening. A vent panel is provided for covering the opening and a vent panel retention mechanism is provided for reversibly holding the vent panel in place over the opening. Methods and kits for installing a vent panel in a soffit of an exterior elevated assembly with a walking surface are also described.

A shielded locking system for securely closing a lid on an enclosure, such as a grade level utility vault, including an L-bolt connected to a spring-biased slide member positioned on the underside of the lid that rotates in a slotted housing that securely retains the L-bolt under the lid, the slide member engaging an abutment on the inside of the enclosure when the lid is forced down over an opening in the enclosure by downward force on the lid which progressively causes the latch to retract against the spring-bias from contact with the abutment and then snaps the latch into a spring-biased locking position under the abutment, and a non-conductive cover positioned over and connected to the locking system to shield the L-bolt from electrical conductivity from within the enclosure.

Traffic-compatible vented precipitation guarding manhole cover assemblies may include a manhole cover having an exterior manhole cover surface and an interior manhole cover surface. At least one opening may extend through the manhole cover from the interior manhole cover surface to the exterior manhole cover surface. A flexible, resilient extension conduit having elastic recoil memory may extend from the exterior manhole cover surface at the at least one opening.

An exterior elevated assembly with a walking surface is described which has features for facilitating inspection of the interior support frame of the assembly. The assembly includes a support frame for the walking surface, which defines an interior space and a soffit covering an underside of the support frame. The soffit provided with an opening. A vent panel is provided for covering the opening and a vent panel retention mechanism is provided for reversibly holding the vent panel in place over the opening. Methods and kits for installing a vent panel in a soffit of an exterior elevated assembly with a walking surface are also described.

A manway open and close assist device that is operably connected to at least one upper hinge attachable to a manway cover and a lower hinge attached to a vessel or tank. The device comprises. A disc-like piston is mounted on a threaded input screw and at least one anti-rotation member to provide linear translation of the piston due to rotation of the input screw. A cylindrical and tubular housing that receives the threaded input screw, the anti-rotation member, and the piston, wherein the housing has a plurality of helical grooves disposed in its inner surface that receive teeth on the outer surface of the piston. The housing may be fixed to the upper hinge member(s) and a rotation of the housing and attached hinge member(s) is effectuated by rotating the input screw and resulting linear movement of the piston to open and close the manway cover.

In one embodiment, an electronically controlled hatch system for safe ingress, egress, hazard detection, and methods thereof are provided to reduce or eliminate hazards to personnel, including protection of people above and below a scuttle hatch, access port, skylight or elevated deck. Said hatch system reduces the risk of falls while ascending or descending a ladder through an access port. In certain embodiments, severe weather, hazard, security, and other safety information are detected and transmitted to a central control unit for processing and regulating the opening and closing of a hatch covering the access port and/or raising and lowering a safety railing system based on said information and/or user input. Said hatch system may include an actuator and guides for automatically locking/unlocking and opening/closing a hatch, an actuator and guides for automatically raising/lowering a railing system, safety monitoring detectors/apparatuses, and a centralized controller.