A hydrocarbon tank system environment corrosion inhibitor includes use of inert gas, preferably Nitrogen, to blanket ullage and interstice through the tank system. Blanket gas is provided via controller into coupling to access ullage. Blanket gas is provided upon fueling events to stabilize the pressure in the system and prevent entry of atmospheric air and water (vapor). Blanket gas may be continuously run into the ullage and/or other spaces in tank system. A controlled system allows for monitoring of pressures in the tank, and thereby identifies pressure events and even leaks in system due to unusual events, or general loss of pressure.

A subgrade vault system and method of forming the same is provided. Specifically, a subgrade vault suitable for housing utility and similar equipment is provided, the vault comprising a main body portion, a cap, and a lid that may be selectively secured to prevent or deter unauthorized access to vault contents.

A subgrade vault system and method of forming the same is provided. Specifically, a subgrade vault suitable for housing utility and similar equipment is provided, the vault comprising a main body portion, a cap, and a lid that may be selectively secured to prevent or deter unauthorized access to vault contents.

The invention provides an underground thermal energy storage having a shape selected from substantially cylindrical and an n-gonal prism, having an axial direction that in use is vertical, and comprising an inner volume for holding a liquid, said energy storage device comprising a peripheral outer wall, a peripheral inner wall around said inner volume, and a filling layer between said inner wall and said outer wall, said inner wall comprising a series of modular wall parts provided with a heat exchanger for exchanging thermal energy with said liquid, said modular wall parts arranged in rings and said modular wall parts each having opposite radial surfaces that are in use vertical, an inner tangential surface contacting said inner volume, an outer tangential surface directed towards said outer wall, and opposite axial surfaces that are in use horizontal, said modular wall parts comprising an elastic sealing between a joint of adjacent radial surfaces for limiting liquid flow between the inner volume and the filling layer and taking up thermal expansion of the modular wall parts, and said filling layer comprising an insulating layer extending over at least part of a height of the underground energy storage, having an R value designed for providing said outer wall at a temperature of below 30 C. when said inner volume is at a temperature of at least 90 C., and a structural layer for maintaining said insulating layer and said prefab inner wall parts in position.

The invention provides an underground thermal energy storage having a shape selected from substantially cylindrical and an n-gonal prism, having an axial direction that in use is vertical, and comprising an inner volume for holding a liquid, said energy storage device comprising a peripheral outer wall, a peripheral inner wall around said inner volume, and a filling layer between said inner wall and said outer wall, said inner wall comprising a series of modular wall parts provided with a heat exchanger for exchanging thermal energy with said liquid, said modular wall parts arranged in rings and said modular wall parts each having opposite radial surfaces that are in use vertical, an inner tangential surface contacting said inner volume, an outer tangential surface directed towards said outer wall, and opposite axial surfaces that are in use horizontal, said modular wall parts comprising an elastic sealing between a joint of adjacent radial surfaces for limiting liquid flow between the inner volume and the filling layer and taking up thermal expansion of the modular wall parts, and said filling layer comprising an insulating layer extending over at least part of a height of the underground energy storage, having an R value designed for providing said outer wall at a temperature of below 30 C. when said inner volume is at a temperature of at least 90 C., and a structural layer for maintaining said insulating layer and said prefab inner wall parts in position.

An anti-slip bowl is described herein. A bowl can include a rigid first shell including a base and an outer wall continuously attached to the base, a rigid second shell including a base and an outer wall continuously attached to the base, and an anti-slip material positioned between the rigid first shell and the rigid second shell and protruding through a number of openings on the rigid second shell.

A subgrade vault system and method of forming the same is provided. Specifically, a subgrade vault suitable for housing utility and similar equipment is provided, the vault comprising a main body portion, a cap, and a lid that may be selectively secured to prevent or deter unauthorized access to vault contents.

A subgrade vault system and method of forming the same is provided. Specifically, a subgrade vault suitable for housing utility and similar equipment is provided, the vault comprising a main body portion, a cap, and a lid that may be selectively secured to prevent or deter unauthorized access to vault contents.

A sulfur pit that mitigates water ingress may include a concrete slab roof that comprises a first concrete slab and a second concrete slab; a polymer sealant disposed on an exterior surface of the concrete slab roof; a refractory layer disposed on an interior surface of the concrete slab roof; and at least one expansion joint located in the gap between the first concrete slab and the second concrete slab. The expansion joint may include a fiber rope disposed in the gap between the first concrete slab and the second concrete slab; a fluoroelastomer caulk located (a) in a first spacing between the fiber rope and the first concrete slab and (b) in a second spacing between the fiber rope and the second concrete slab; and a steel plate spanning the gap between the first concrete slab and the second concrete slab.

A sulfur pit that mitigates water ingress may include a concrete slab roof that comprises a first concrete slab and a second concrete slab; a polymer sealant disposed on an exterior surface of the concrete slab roof; a refractory layer disposed on an interior surface of the concrete slab roof; and at least one expansion joint located in the gap between the first concrete slab and the second concrete slab. The expansion joint may include a fiber rope disposed in the gap between the first concrete slab and the second concrete slab; a fluoroelastomer caulk located (a) in a first spacing between the fiber rope and the first concrete slab and (b) in a second spacing between the fiber rope and the second concrete slab; and a steel plate spanning the gap between the first concrete slab and the second concrete slab.