> Products > Floating Roof Tank
- Single Deck Type
- Double Deck Type
Max. Capacity / Unit
- 200,000m3 (1,200,000BBL)

STE's floating roof tank provides great advantage in retaining volatile liquids and will reduce evaporation loss to a greater degree. It will also insure safety from possible fire hazards. The roof of the tank is unique in that it covers the entire surface of the liquid, rising as liquid is pumped into the tank and lowering as liquid is drawn out, eliminating vapor space between the liquid and the roof.

As an example, over ninety-four percent of this loss could be saved by using STE's flat bottom floating roof tanks, thereby effecting tremendous cost reduction to the user and saving valuable fuels.
Single Deck Type
A single deck type floating roof has an annular pontoon around the edge and a deck of single thickness in the center as seen in the diagram. The annular pontoon is divided into several chambers by radial bulkheads.
The upper surface of the pontoon is slanted down toward the center for drainage purposes and the lower surface of the pontoon is inclined upward to the center of roof in order to accumulate vapor in the single deck part.
The ratio of pontoon area to the total area varies according to the size of the tank, storing product and the accessories.

Double Deck Type
A double-deck type floating roof has two complete decks covering the entire liquid surface. The roof is consisted of a portion divided by the ring and radial bulkheads into several compartments and a portion called the flexible bay.
The flexible bay can be inflated according to filling operations or as rainwater accumulates on the top deck of the roof sloping downward.
The bottom deck slopes upward toward the center so that accumulated vapor is trapped at the center of the roof.

Covered Floating Roof Tank
The covered floating roof tank features affixed roof in addition to the floating roof. Due to the simplicity in design and high strength materials used in manufacture, many years of trouble-free service can be expected.
By the utilization of affixed roof, the floating roof is well protected from the elements, thereby, drastically reducing maintenance costs and preventing evaporation loss. In addition, hardly any accessories are required, permitting the floating roof to be used at lower levels which is almost impossible with conventional floating roof tanks. Even if vapor accumulates, it will not exceed the explosion point since the space above the floating roof is well ventilated.