OPERATIONS:
After only slight modification to the existing tank,
the lightweight dome is set in place to convert an
external floating roof system into a domed roof tank
with an internal floating cover. Operation of the tank

no longer requires attention to weather conditions.
Snow, ice and water accumulations are eliminated,
avoiding the expensive disaster of a sunken cover.
Seal systems are free to work efficiently, as
designed, without the hindrance of snow and ice
build-up. Labor and resources previously reserved in
anticipation of potential problems can be earmarked
for other terminal operation projects.
MAINTENANCE: Attractive aluminum
domes are resistant to the elements, virtually
eliminating the periodic expense of painting required
by steel roofs.
Additionally, maintenance costs previously experienced
with the external floater will be
reduced substantially. By eliminating pools of
standing water, the friction of ice and snow loads,
and high temperatures from direct sunlight, any
coating used on the steel floater will last much
longer.
Seal systems will last longer. In fact, less elaborate
rim seals may be considered when replacement becomes
necessary because the extra design requirement to
resist the
elements is eliminated, the seals will now serve the
simple purpose of product conservation.
ADVANTAGES: Additional environmental
advantages may be gained by converting an external
floating roof (EFR) system to a domed internal
floating roof (IFR) design.
Wind effects over the top of an EFR increases
evaporation loss through sealing systems. The same
wind effect is not experienced in an IFR, consequently
the expense of installing secondary seals can
sometimes be saved with a dome installation.
A domed roof prevents rain water from entering the
product, either around the floating roof seal or
through the floating roof drain systems.
Finally, the severe condition of an EFR heavily loaded
with ice and snow, sinking and perforating a tank
bottom with its legs is eliminated. The resulting
product loss, fire hazard and cleanup costs can be
avoided.