Floating Roof Tank Grounding

Studies by the api american petroleum institute have shown these shunts often fail to provide the required contact between the roof and wall.

Floating roof tank grounding.

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. It is easy to install on both new and existing tanks. 216 v to 250 v power rating. The source of ignition is often atmospheric electricity.

110 120 v 50 60 hz system supply voltage range. The lec retractable grounding assembly rga provides the lowest possible impedance bond between the floating roof and tank shell. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. 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.

Temperature rating 25 c to 55 c. 1 tank connected without insulating joints to a grounded metallic piping system. Most fires on floating roof tanks are small rim fires caused by vapor leaking through the seals. 108 v to 125 v 220 240 v 50 60 hz system supply voltage range.

As opposed to a fixed roof tank there is no vapor space in the floating roof tank. The roof rises and falls with the liquid level in the tank. Storagetech storage tank internal floating roofs storagetech has been proudly innovating designing manufactiring and installing external and internal pon. 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.

An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate. Failures of floating roof primary and secondary seals foam filled or liquid filled have been a significant concern. It is also easy to inspect test and maintain. 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. Poor tank turnaround practices with inadequate checking of roof supports. 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. Groundguardian floating roof tank monitor reel.

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.