Floating Roof Tank Grounding

The roof rises and falls with the liquid level in the tank.

Floating roof tank grounding.

Storagetech storage tank internal floating roofs storagetech has been proudly innovating designing manufactiring and installing external and internal pon. 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. They are prone to wear issues as well as being sensitive to tank deformation. Studies by the api american petroleum institute have shown these shunts often fail to provide the required contact between the roof and wall.

An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate. Most fires on floating roof tanks are small rim fires caused by vapor leaking through the seals. 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 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.

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. Temperature rating 25 c to 55 c. Groundguardian floating roof tank monitor reel. Poor tank turnaround practices with inadequate checking of roof supports.

In principle this eliminates tank breathing loss and greatly reduces the evaporative lo. 216 v to 250 v power rating. 110 120 v 50 60 hz system supply voltage range. It is also easy to inspect test and maintain.

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

It is easy to install on both new and existing tanks. As opposed to a fixed roof tank there is no vapor space in the floating roof tank. 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. Failures of floating roof primary and secondary seals foam filled or liquid filled have been a significant concern.

The source of ignition is often atmospheric electricity.