Floating Roof Tank Grounding

Floating roof tanks are designed to reduce emissions by eliminating the buildup of vapors above volatile liquids using decades old technology for sealed roofs that float up and down on top of the.

Floating roof tank grounding.

As opposed to a fixed roof tank there is no vapor space in the floating roof tank. It is also easy to inspect test and maintain. Poor tank turnaround practices with inadequate checking of roof supports. Groundguardian floating roof tank monitor reel.

The roof rises and falls with the liquid level in the tank. 108 v to 125 v 220 240 v 50 60 hz system supply voltage range. Most fires on floating roof tanks are small rim fires caused by vapor leaking through the seals. 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.

An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate. It can be eliminated as a source of ignition by fitting shunts strips of metal about every meter or so around the rim to ground the roof to the tank walls. Lec has developed a roof shell bonding mechanism that fulfills all of these requirements. It is easy to install on both new and existing tanks.

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. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. 216 v to 250 v power rating. The lec retractable grounding assembly rga provides the lowest possible impedance bond between the floating roof and tank shell.

Studies by the api american petroleum institute have shown these shunts often fail to provide the required contact between the roof and wall. 1 tank connected without insulating joints to a grounded metallic piping system. Floating roof tank shunts shown in the image above used for many years as the default method to earth out ground the roof to the tank wall. The source of ignition is often atmospheric electricity.

There was a fatality on a large diameter floating roof tank when a contractor died under the weight of the roof plates which collapsed on him. In principle this eliminates tank breathing loss and greatly reduces the evaporative lo. Temperature rating 25 c to 55 c. 110 120 v 50 60 hz system supply voltage range.

They are prone to wear issues as well as being sensitive to tank deformation.