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Таble 4  The losses of fuel in the tank, depending on the presence of a pontoon


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Таble 4 
The losses of fuel in the tank, depending on the presence of a pontoon 
The presence of the 
pontoon 
of 
the 
spheres floats in the 
reservoir storage with 
capacity 6 m
3
Loss of petrol, kerosene, diesel fuel, gas condensate in 
the reservoir during the summer, 3 months of exposure., 
kg 
petrol 
kerosene 
diesel fuel 
gas 
condensate 
Without pontoon
51.5 
32.2 
18.1 
49.1 
With pontoon 
8.2 
5.1 
2.2 
5.2 
The drawback of pontoon from the spheres floats was its ineffectiveness 
during the firefighting of fuel in the tank. In this connection, the pontoon was made 
of conoid floats with fire
-prevention function (Fig. 2). It was provided by filling 
the flask float with volume 1.85 l to 500 ml by solution composition, (weight. %): 
1) the fuel burning stabilizer: superphosphate or double superphosphate: 3%; 2) 
surfactant-foaming agent: 3-5%, 3) the rest is water. 
Fig. 2. Floats view from aside (on the left) and above during the 
immersion (on the right). 
During a fire, the foam is distributed to the interface «fuel-air». After 
pouring of a foaming solution into float carbon dioxide gas or nitrogen is pumped 
under pressure 0.2-0.25 MPa in the cap of the neck through the nipple there that 
does not support combustion. Filling of the area is 96-98% of liquid mirror. 


62 
Requirements TSh 64-1453781-002:2008 are met: 
- self-quenching of the flame at the sudden fire of petroleum products
- absence of jamming of the pontoon and material corrosion; 
- removal of the destruction’s danger of the tank’s bottom by hitting it by pontoon; 
- removal of the jamming threat by fragments of pipelines floats
- exclusion of electrified floats;
- high economy and ease of technology use
- low cost of manufacture and operation of the pontoons. 

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