Floating Roof Tank Grounding

Internal floating roofis where the roof floats on the product in a fixed roof tank.

Floating roof tank grounding. 1 tank connected without insulating joints to a grounded metallic piping system. Comprehensive lightning strike protection for floating roof tanks. External floating roofis where the roof floats on the product in an open tank and the roof is open to atmosphere. Floating roof tank grounding method eliminates rim fires 21st february 2013 paul boughton oil industry engineers must be aware of bound charge and secondary arc risk to oil facilities since secondary lightning effects such as bound charge and secondary arc can be 1000 times more common than direct lightning strikes.

The external floating roof tank has a floating roof deck which is covered on the surface of oil and floats up and down with the oil level. As opposed to a fixed roof tank there is no vapor space in the floating roof tank. New aluminum cable originally developed for marine use greatly improves corrosion resistance and is highly resistant to hydrogen sulfide h2s. Active floating roof tank monitoring system.

Floating roof tanks are especially vulnerable to the direct and indirect effects of lightning. In principle this eliminates tank breathing loss and greatly reduces the evaporative lo. Floating roof tanks seals on floating roof fr shall be bonded to the shell by shunts type 302 28 gauge 2 inch wide stainless steel straps at maximum 10 ft spacing all metal tanks all must be grounded by one of the following. Uses patented innovative active monitoring technology to detect any change in electrical bond resistance between a floating roof and the storage tank s grounding system.

An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate. The roof rises and falls with the liquid level in the tank. The rga is able to do this better than other methods because designers analyzed and found ways to overcome the weaknesses of other traditional devices for grounding floating roof tanks. When these lightning currents arc across the roof shell interface they can ignite any flammable vapours present with devastating effect.

Direct or a nearby lightning strike can cause electrical current to flow across the tank shell and roof. Floating roof tank fires are common there are 15 to 20 tank fires per year and over half of them involve floating roof tanks frt. As there is almost no gas space between floating roof deck and oil level the evaporation loss of stored oil can be greatly reduced. There are 2 types of floating roof.

The atex approved patented retractable grounding assembly rga substantially reduces the risk of tank fires by subduing sustained arcs during lightning events and other electrical phenomena. The rga is able to do this better than other methods because designers analysed and found ways to overcome the weaknesses of other traditional devices for grounding floating roof tanks. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. Retractable grounding assembly 750 rga 750 product overview comprehensive lightning strike protection for floating roof tanks.