A system for monitoring a floating roof of a liquid storage tank and a method for use of the system are described. The system includes linear position measuring devices to determine the vertical location and orientation of the floating roof within the storage tank and one or more transmitters to relay such information to a monitoring, recording, or control device, or to a remote computer network location. Typically, three measuring devices are used, positioned at or near the top of the storage tank and generally equally spaced around the perimeter of the tank. The system and method are useful to monitor the position and inclination of a liquid storage tank floating roof, such as may be used in the petrochemical, chemical and other industries where such storage tanks are in use.

A float floating in a liquid has a spherical body having a spherical shape from which parts are cut off so as to form a regular hexagonal shape when viewed from one direction. In addition, the float is shaped so as to form a regular hexagonal shape when viewed from the above-mentioned one direction, and the floats are arranged in a honeycomb geometry to thereby reduce the contact area between the liquid and air.

A float floating in a liquid has a spherical body having a spherical shape from which parts are cut off so as to form a regular hexagonal shape when viewed from one direction. In addition, the float is shaped so as to form a regular hexagonal shape when viewed from the above-mentioned one direction, and the floats are arranged in a honeycomb geometry to thereby reduce the contact area between the liquid and air.

A number of implementations of an apparatus for supporting a floating roof in a storage tank are described. In one implementation, the apparatus includes at least two vertical support members coupled together at the top and bottom by spans members.

A number of implementations of an apparatus for supporting a floating roof in a storage tank are described. In one implementation, the apparatus includes at least two vertical support members coupled together at the top and bottom by spans members.

A sulfur storage tank includes a bottom plate, an outer wall, and a cleanout door. The outer wall surrounds and is coupled to the bottom plate. The cleanout door is installed on the outer wall. The cleanout door includes an edge and a drain nozzle. The edge abuts the bottom plate. The drain nozzle is installed on the cleanout door. The drain nozzle defines a centerline offset from the edge. The drain nozzle is configured to gravity drain fluid from the sulfur storage tank.

A sulfur storage tank includes a bottom plate, an outer wall, and a cleanout door. The outer wall surrounds and is coupled to the bottom plate. The cleanout door is installed on the outer wall. The cleanout door includes an edge and a drain nozzle. The edge abuts the bottom plate. The drain nozzle is installed on the cleanout door. The drain nozzle defines a centerline offset from the edge. The drain nozzle is configured to gravity drain fluid from the sulfur storage tank.

Tank lids include a first coated substrate including a first part having a first thickness, a first elastomer coating the first part, a second coated substrate positioned adjacent to the first coated substrate, the second coated substrate including a second part having a second thickness, and a second elastomer coating the second part. A first seam can be formed between the first and second coated substrates to allow for moisture to pass between the first and second coated substrates so that moisture is allowed to seep away from the top of the tank lid.

Tank lids include a first coated substrate including a first part having a first thickness, a first elastomer coating the first part, a second coated substrate positioned adjacent to the first coated substrate, the second coated substrate including a second part having a second thickness, and a second elastomer coating the second part. A first seam can be formed between the first and second coated substrates to allow for moisture to pass between the first and second coated substrates so that moisture is allowed to seep away from the top of the tank lid.

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.