Floating Roof Tank Grounding

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.

Floating roof tank grounding.

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. They are prone to wear issues as well as being sensitive to tank deformation. Most fires on floating roof tanks are small rim fires caused by vapor leaking through the seals. Failures of floating roof primary and secondary seals foam filled or liquid filled have been a significant concern.

As opposed to a fixed roof tank there is no vapor space in the floating roof tank. 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 roof rises and falls with the liquid level in the tank. 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. Storagetech storage tank internal floating roofs storagetech has been proudly innovating designing manufactiring and installing external and internal pon. In principle this eliminates tank breathing loss and greatly reduces the evaporative lo. Poor tank turnaround practices with inadequate checking of roof supports.

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 is also easy to inspect test and maintain. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. The lec retractable grounding assembly rga provides the lowest possible impedance bond between the floating roof and tank shell.

Lec has developed a roof shell bonding mechanism that fulfills all of these requirements. 216 v to 250 v power rating. It is easy to install on both new and existing tanks. Groundguardian floating roof tank monitor reel.

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. Temperature rating 25 c to 55 c. 110 120 v 50 60 hz system supply voltage range. An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate.

1 tank connected without insulating joints to a grounded metallic piping system.