Important measures taken by double-layer oil tanks in terms of safety and explosion prevention

Emergency treatment methods for sudden dangers in double-layer oil tanks

With the continuous improvement of people's living standards, safety is the most concerned thing in the current production and operation, especially the fire prevention of gas stations has been strictly required. Although the current gas stations have added barrier explosion-proof materials, we still have to be prepared and take remedial measures in case of danger. Today we will explain to you the emergency treatment measures for the dangers of double-layer oil tanks.

Use multiple DC fire hoses to spray from all directions (appropriately avoid the upwind direction) to focus on the open area, seal the flame on the top of the tank, isolate the oil and gas, and suffocate due to lack of oxygen. After the oil tank explodes, if there is oil spillage and burning in the fire dike, the oil fire in the fire dike should be extinguished first, and cooling water should be used to cool the outer wall of the oil tank.

If the oil tank explodes and the top cover is lifted off, the above procedures shall be followed. If the nozzle of the fixed foam fire extinguishing device has been damaged, a temporary nozzle should be installed, and then the foam fire extinguishing agent should be injected into the tank for fire fighting. If the above methods do not work, a certain amount of foam, dry powder or 1211 fire trucks must be concentrated to spray from around the oil tank to the center of the flame to extinguish the fire.

To prevent the burning oil tank from spreading to the surrounding oil tanks, use multiple DC fire hoses to spray between the burning oil tank and the adjacent oil tank to form a water curtain to isolate the flame and smoke. At the same time, cover the breathing valve and air vents of the adjacent oil tanks with wet asbestos cloth to prevent sparks from entering the tank.

If conditions permit, the oil in the burning oil tank should be transferred to a safe oil tank, but it must be noted that the oil level of the burning oil tank should not be lower than the height of the output pipeline. After the fire is extinguished, continue to spray with foam or fire water to prevent re-ignition.

Barrier explosion-proof principle

With the continuous improvement of industry and society's awareness of safety, gas stations are gradually converting to barrier explosion-proof skid-mounted stations, so some relevant knowledge of skid-mounted stations has become a necessary technical common sense for skid-mounted station manufacturers. Today we will introduce the barrier explosion-proof principle of skid-mounted stations to you.

Barrier explosion-proof principle: After placing special aluminum alloy mesh explosion-proof materials in the oil storage tank, the mesh in the explosion-proof material stack forms a honeycomb structure, which divides the inner cavity of the container into many small "small compartments". These "small compartments" can curb the spread of flames. At the same time, this honeycomb structure has good thermal and electrostatic conductivity per unit volume, eliminates static electricity, prevents static electricity accumulation, and can quickly absorb most of the heat released by combustion, greatly reducing the temperature after the combustion reaction, greatly reducing the expansion of the reaction gas, and the pressure value of the container does not increase much, achieving the purpose of suppressing explosions. Effectively prevent oil storage tanks from exploding under open flames, static electricity, welding, shooting, collisions, etc.

The increase in the filling of the two materials makes the barrier explosion-proof material explosion-proof effect

The barrier explosion-proof materials on the market currently use the flame obstruction effect and the free radical "wall adsorption" effect. This material is already relatively mature in explosion protection. However, with the continuous improvement of safety requirements, adding metal filling materials and non-metal filling materials to barrier explosion-proof materials can make the barrier explosion-proof material The explosion-proof effect of the material is even better.

Both metal filling materials and non-metal filling materials will play a good role in explosion-proof and explosion-proofing of the fuel tank, and will not produce the phenomenon of charge accumulation during use, but the advantages and disadvantages of the two are also obvious.

The advantages of mesh aluminum alloy filling materials are long life and easy maintenance; good compatibility with oil products; good thermal conductivity; no pollution after scrapping; but the oil product device filled with explosion-proof materials will be slightly heavier.

The advantages of mesh polyurethane filling materials are light weight; low cost; but compared with aluminum alloy materials, their own volume and fuel adsorption residues will occupy part of the available device capacity.

Application of barrier explosion-proof materials in other fields

After placing special aluminum alloy mesh barrier explosion-proof materials in oil storage tanks, the mesh in the explosion-proof material stack forms a honeycomb structure, which divides the inner cavity of the container into many small "small compartments". These "small compartments" can curb the spread of flames. At the same time, this honeycomb structure has excellent thermal and electrostatic conductivity per unit volume, eliminates static electricity, prevents static electricity accumulation, and can quickly absorb most of the heat released by combustion, greatly reducing the final temperature after the combustion reaction, greatly reducing the expansion of the reaction gas, and the pressure value of the container does not increase much, achieving the purpose of suppressing explosions. Effectively prevent explosion accidents in oil storage tanks under open flames, static electricity, welding, shooting, collisions, etc. Timely monitor the oil tank's oil leakage test mirror to observe whether there are existing seepage and leakage in the inner tank wall.

Aluminum foil honeycomb for barrier explosion-proof materials is a mesh structure material made of alloy aluminum foil through mechanical processing. It is filled in a container for storing flammable and explosive liquids according to a certain density and method. When the air in the container is mixed with the corresponding liquid vapor to reach the explosion limit range, there will be no explosion accident when encountering open flames, static electricity impact, lightning strikes and accidental violent impact accidents, which fundamentally solves the inherent safety of flammable and explosive liquid and gaseous dangerous chemicals in the storage and transportation process. Daily observation of whether the nuts and bolts of the pump, coupling, and motor can be tightened.

Several common reasons for static electricity generated by explosion-proof refueling devices

Generation of static electricity in oil pipelines and refueling areas When oil flows from the oil storage tank through the oil pipeline, the explosion-proof refueling device is prone to flow electrification and form a rush current. Generation of static electricity in oil tankers During the process of loading, transporting and unloading oil, the oil tankers that enter and exit the gas station all year round repeatedly wash, contact and rub against the oil tank wall, the crane pipe used for unloading and loading oil, which causes the charge to accumulate and generate static electricity. When the charged body of the explosion-proof refueling device reaches a certain electrostatic potential (generally greater than 300V) due to charge accumulation, electrostatic discharge will occur. In addition, there is an explosive mixture in the surrounding space, and an explosion accident may occur at this time.

The generation of static electricity in the oil tank area. When the oil tank is filled with oil or the oil products are poured between tanks, the bottom oil filling method is generally used. Although this method is more reasonable than the upper oil filling method, when the oil products are ejected from the oil filling pipe at high speed, due to the large number of facilities in the explosion-proof refueling device in the gas station area, static electricity is mainly generated and accumulated in the oil tank area, oil pipeline and refueling area, and tank trucks. Due to the different structures and locations of various explosion-proof refueling devices, the links and causes of static electricity are also different.

Written by

TAIAN SHENGDING METAL CONTAINER MANUFACTURING CO., LTD.

Editor Wang

www.self-bunded-tank.com

WhatsApp : +86 152 5486 3111

Email :shengdingtank@126.com