Classification of storage tanks (internal floating roof storage tanks)

a. Metal disc-type internal floating roof, metal bulkhead-type internal floating roof, metal floating boat-type internal floating roof, metal double-disc type internal floating roof, metal internal floating roof on buoy tanks, sandwich-type metal interlayer plate internal floating roof, hybrid internal floating roof

The fire separation distance for internal floating roof storage tanks is related to the type of floating deck. May I ask which types have the same fire separation distance as those with fixed roofs, and which ones differ?

If I knew, I wouldn’t be asking here :(

"A floating roof tank with a steel floating disk, no floating cabin, and an edge plate height of not more than 0.5 M is known as a shallow-disk type floating roof tank. A shallow tray is, to put it vividly, like a footbath placed on the surface of a liquid; under normal conditions it can provide some level of sealing and help reduce the effects of vaporization and absorption. However, its resistance to sinking is much lower than that of buoyant-type trays. If the liquid level rises during processes such as filling the tank and overflows the edge of the footbath, the tank will sink. Shallow-tray type trays were phased out long ago. " The above is excerpted from the forum. As a new generation of oil workers at the new refinery, I have never seen this type of shallow-dish internal floating roof; it seems to have been phased out by now. So far, most of those seen are pontoon-type.

Since your definition specifies a steel floating roof, aluminum ones certainly aren’t shaped like shallow trays.

Question 1: An internal floating roof tank is simply that – an internal floating roof tank; there is no difference in the tank itself. There are several structural types for modular internal floating roofs, with the triangular shape being the most common, followed by the grid structure, as well as other variations such as the liquid-contacting type (also known as the sandwich type) and the box-shaped floating roof. Question 2: The shallow-disk type features a steel inner floating disk, which is an integrated inner floating disk made by welding steel plates; it is prefabricated and installed on-site, and is basically a product that has been phased out. The internal floating discs mentioned above are all made of aluminum alloy or stainless steel; they are internal floating discs that are produced by accessory factories and assembled on-site. Experts in internal floating disk manufacturing – welcome for technical consultations.

The standard fire separation distance is relatively small; fire safety requirements dictate the use of floating pads made from materials with high melting points, such as steel or stainless steel floating pads. Aluminum alloy floating pads, with their low melting points, cannot be used.

The steel internal floating discs manufactured on-site are generally of the shallow-disc type or double-disc type.