Floating Roof Tank Grounding

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.

Floating roof tank grounding.

108 v to 125 v 220 240 v 50 60 hz system supply voltage range. Lec has developed a roof shell bonding mechanism that fulfills all of these requirements. 1 tank connected without insulating joints to a grounded metallic piping 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.

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. As opposed to a fixed roof tank there is no vapor space in the floating roof tank. 110 120 v 50 60 hz system supply voltage range. 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. Studies by the api american petroleum institute have shown these shunts often fail to provide the required contact between the roof and wall. 216 v to 250 v power rating. 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.

Groundguardian floating roof tank monitor reel. It is easy to install on both new and existing tanks. 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. The roof rises and falls with the liquid level in the tank.

Poor tank turnaround practices with inadequate checking of roof supports. They are prone to wear issues as well as being sensitive to tank deformation. 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. Storagetech storage tank internal floating roofs storagetech has been proudly innovating designing manufactiring and installing external and internal pon.

The lec retractable grounding assembly rga provides the lowest possible impedance bond between the floating roof and tank shell. 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. The source of ignition is often atmospheric electricity. Temperature rating 25 c to 55 c.

Failures of floating roof primary and secondary seals foam filled or liquid filled have been a significant concern.