|STORAGE TANKS & VESSELS - Floating Roof Storage Tanks|
|Written by Norrie|
|Monday, 24 May 2010 21:43|
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FLOATING ROOF STORAGE TANKS
A 'Floating Roof', as its name implies, actually floats on the surface of the liquid in the tank. As the liquid level changes the roof is designed to move up and down with the liquid level - i.e. Filling, Emptying, Expansion and Contraction due to temperature changes. This type of tank roof minimises the vapour space between it and the liquid surface. Since there is no large vapour space for the liquid to evaporate into, vapour losses are also minimised.
1. The ' Pontoon ' Roof:
This consists of a series of pontoons - (closed compartments) around the outer edge of a central plate. This construction increases the floating stability. The roof is also sloped towards the centre to allow rain water to flow into a water drainage system.
2. The 'Double-Deck' Roof:
This is a development which employs two separate decks of steel plate over the entire tank area. The space between the upper and lower plates is divided into compartments. With this type, the liquid is never in contact with the underside of a plate whose top surface is directly exposed to the sun's rays, as is the centre section area of the pontoon roof and the full area of the pan type roof.
|Last Updated on Monday, 24 May 2010 21:47|