What is the main function of an internal floating roof in the petrochemical industry? Do gasoline storage tanks also require an internal floating roof?

What is the main purpose of an internal floating roof?
The floating inner floating roof is a floating cover that moves up and down with the oil level inside the tank. The inner floating roof inside the storage tank is an energy-saving and environmentally friendly device that covers the liquid surface and rises and falls with the liquid level of the tank through buoyancy. To reduce the volatilization of the medium inside the tank, lower losses, save energy, and protect the environment, an inner floating roof is added inside the tank. The main material for the unloading crane pipe product is low-carbon steel, stainless steel, aluminum alloy, etc., while the sealing material for the crane pipe is oil-resistant nitrile rubber and fluororubber. Using this inner floating roof to cover the liquid surface is currently recognized as an ideal, economic, and simple method to reduce oil evaporation losses. Data shows that within 3-6 months, the economic value of the reduced oil vapor emissions is equivalent to the installation and procurement cost of the inner floating roof, meaning the cost can be recouped within six months.
The system is suitable for various sizes of对接 tanks and搭接 tanks, it itself does not contaminate oil or chemicals, reduces medium volatilization loss, prevents air pollution, and is an ideal internal floating roof. The loading arm's balancing system includes counterweights, torsion springs, compression springs, tension springs, and screw jacks, as well as hydraulic and pneumatic balancing, all of which can be operated with minimal force. It boasts low costs, short construction periods, corrosion resistance, non-occupancy of volume, and a long service life.
The purpose of using an internal floating roof on oil tanks is to minimize volatile loss during storage, conserve energy, reduce safety hazards, and decrease environmental pollution.
Without floating roofs on gasoline storage tanks
1. Excessive volatilization loss
2. High oil and gas concentrations at the top of the drum are also unsafe. When using nitrogen blanketing, factors such as nitrogen usage, pressure maintenance, concentration, replenishment, and moisture prevention must be considered. It seems that there are no strict regulations in the relevant design specifications. Of course, if conditions permit, using nitrogen blanketing would definitely have an advantage over internal floating roofs in preventing losses.