Roof Tank Drain Hose for Fuel Storage, floating roof, we couplings, nitrile, viton, aromatic, W.E.

This is how a roof tank drain hose should work, it operates using Gravity and Buoyancy, these are totally free and the calculation for either internal or external ballast aid weights is done to work with the specific gravity of the Product stored.
There are two basic types ... Nitrile Rubber with resistance to hydrocarbons and Aromatics to 70%.
Viton / FKM - Fluoroelastomers Rubber for resistance to 100% Aromatic.

There is a large Misconception of how this type of Tank Drain Hose works, everyone adds to much ballast, this holds the hose down to the floor, it can damage the internal coating and be washed around with agitators, inward and outward flow. This will create dangers of the hose getting trapped behind / underneath legs. If the hose is not on the floor,, it cannot get trapped.
Other problems of the hose being on the floor are holding water and silt / debris (causing blockage) also in cold climates if the hose holds water it can freeze, again causing a blockage.

Due to heavier rainfalls all over the world and bigger volume of downpours the bore of the drain system is better kept clear to evacuate water from the roof faster. The OBJECTIVE of a roof drain hose is to evacuate water as efficiently as possible.

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