A floating cover system for a container with an open top includes a plurality of floating cover sections with cover connector devices spaced along a periphery of each at a connector spacing. A ballast tube has tube connector devices spaced along the exterior thereof at the same connector spacing. The ballast tube is open at each end and longer ballast tubes also define access holes along a length thereof. Water enters an interior of the ballast tube through the open ends thereof and the access holes, if any. When all the cover sections are installed in the container, the open top of the container is substantially covered by cover sections joined together at seams where adjacent cover connector devices are connected together, and the tube connectors are connected to the cover connectors along a ballast seam such that the ballast tube is located under the ballast seam.

A full contact pontoon floating deck is revealed. An upper and a lower assembly grooves are disposed concavely on an upper and a lower ends of each of two sides of a pontoon respectively. A connecting rod is connected to the two pontoons by upper connecting members and lower connecting members. One end of the upper connecting member and one end of the lower connecting member are connected to the upper and the lower assembly grooves of the pontoon respectively by upper and lower assembly members while an upper and a lower connecting portions on the other end of the upper and the lower connecting members are connected to an upper and a lower connecting grooves of the connecting rod respectively. Thereby the tight connection forms a fully-sealed design with good support strength. No vapor space is formed so that environmental requirements are met.

A full contact pontoon floating deck is revealed. An upper and a lower assembly grooves are disposed concavely on an upper and a lower ends of each of two sides of a pontoon respectively. A connecting rod is connected to the two pontoons by upper connecting members and lower connecting members. One end of the upper connecting member and one end of the lower connecting member are connected to the upper and the lower assembly grooves of the pontoon respectively by upper and lower assembly members while an upper and a lower connecting portions on the other end of the upper and the lower connecting members are connected to an upper and a lower connecting grooves of the connecting rod respectively. Thereby the tight connection forms a fully-sealed design with good support strength. No vapor space is formed so that environmental requirements are met.

A floating cover for a body of water has a flexible, impermeable substrate with a bottom face and a top face opposite the bottom face. The substrate is secured laterally across the surface of the body of water while being permitted to move vertically as the level of the body of water changes. A float is affixed to the bottom face of the substrate and a structure is rigidly mounted above the float. The structure extends above the top face of the substrate. The substrate is sealed between the float and the structure. The buoyant force of the float acts against the weight of the structure to maintain the substrate immediately adjacent to the float above the top surface of the body of water so as not to interfere with precipitation drainage.

A system for providing a flexible cover in a storage tank is provided that reduces the amount of vapors released from a hydrocarbon liquid and other liquids and reduces the amount of product (liquid) lost to the atmosphere. The flexible cover is, in some embodiments, comprised of one or more membranes joined together along their respect perimeter edges. The membranes are made from a material or materials that allow the cover to roll up, or otherwise reduce the cross sectional diameter or area of the cover, to allow the membrane to pass through a port in a storage tank. Once inside the storage tank, the cover may return to its normal and/or predetermined dimensions to cover the upper surface of the hydrocarbon or other liquid, which reduces the release of vapors from the hydrocarbon liquid and other liquids.

A system for providing a flexible cover in a storage tank is provided that reduces the amount of vapors released from a hydrocarbon liquid and other liquids and reduces the amount of product (liquid) lost to the atmosphere. The flexible cover is, in some embodiments, comprised of one or more membranes joined together along their respect perimeter edges. The membranes are made from a material or materials that allow the cover to roll up, or otherwise reduce the cross sectional diameter or area of the cover, to allow the membrane to pass through a port in a storage tank. Once inside the storage tank, the cover may return to its normal and/or predetermined dimensions to cover the upper surface of the hydrocarbon or other liquid, which reduces the release of vapors from the hydrocarbon liquid and other liquids.

A method for forming a sealed floating roof for a storage tank is disclosed. A plurality of roof panels are positioned adjacent to one another such that respective depressions of adjacent roof panels disposed adjacent to one another form a walled trough at interconnections of the plurality of roof panels. A self-propelled automatic welder is positioned and guided within the walled trough to make a weld joint at the walled trough, and thus forming the sealed floating roof.

A method for forming a sealed floating roof for a storage tank is disclosed. A plurality of roof panels are positioned adjacent to one another such that respective depressions of adjacent roof panels disposed adjacent to one another form a walled trough at interconnections of the plurality of roof panels. A self-propelled automatic welder is positioned and guided within the walled trough to make a weld joint at the walled trough, and thus forming the sealed floating roof.

A scarifying rig may be mounted on the surface of a floating roof to move about the perimeter of the roof. The rig comprises a trolley, one or more support rails fixed on the trolley, and a horizontal arm mounted on the support rails for controlled movement along the support rails. A vertical rail is attached substantially to the end of the horizontal arm for reciprocating vertical movement (up and down) about the end of the horizontal arm. A nozzle assembly is mounted to the vertical rail.

A scarifying rig may be mounted on the surface of a floating roof to move about the perimeter of the roof. The rig comprises a trolley, one or more support rails fixed on the trolley, and a horizontal arm mounted on the support rails for controlled movement along the support rails. A vertical rail is attached substantially to the end of the horizontal arm for reciprocating vertical movement (up and down) about the end of the horizontal arm. A nozzle assembly is mounted to the vertical rail.