Basic countermeasures for the leakage accident of

Basic countermeasures for liquefied petroleum gas tank leakage accident

liquefied petroleum gas is a flammable and explosive substance, which is easy to cause combustion and explosion under certain conditions in the process of production, transportation, use and storage, resulting in major accidents such as personal casualties and property losses. Dealing with LPG leakage and fire accidents is often encountered by fire forces. Therefore, it is an important topic for commanders at all levels of the fire forces to carefully study and correctly grasp the technical and tactical measures for handling LPG leakage accidents and fire fighting. Utilization of Yantai Huayin Rockwell hardness tester

I. physical and chemical properties of liquefied petroleum gas

the main components of liquefied petroleum gas contain propane, propylene, butene and other low molecular hydrocarbons. Under normal temperature and pressure, it is a colorless, flammable and low toxic gas. After adding odorant, it has a special odor; Relative density of gas: 1; At low temperature or pressure, it is a brownish yellow liquid with a relative density of about 0.5; Biomedical materials are the basis of its development. They are slightly soluble in water. LPG has a low ignition point and ignition energy of a few tenths of a milliJoule. It mixes with air to form an explosive mixture, which burns and explodes in case of sparks and high temperatures. Explosion limit: about 2% - 8%; It is toxic to a certain extent. There are 10 in the air. When Dell sold the new xps13% LPG on the eve of CES exhibition, people will be anesthetized in the gas for five minutes; Maximum allowable filling capacity of container: 85%

II. Leakage prone parts of LPG storage tank

first, the valve flange (sealing gasket) leaks due to aging, cracking and other damage. The leaking flange is divided into the front flange of the valve and the rear flange of the valve. Generally speaking, the leakage of the rear flange of the valve is easy to deal with, and the leakage of the front flange of the valve is difficult to deal with

second, the liquefied gas pipeline has cracks and leaks due to vibration and impact after aging. If the gas phase pipe leaks, the amount of leakage in a certain period of time should be less. If the liquid phase pipe leaks, the amount of leakage is larger

third, the root of the storage tank is prone to cracks and leakage due to material problems or other reasons. Fourth, the large opening of the tank leaks. Due to internal overpressure, or rapid pressurization by high temperature baking, the tear on the top bursts. This kind of leakage is large, the diffusion is fast, and the risk is great

III. leakage disposal measures

1. On site inquiry. After the fire brigade arrives at the scene, it is necessary to know whether there is a fire source in and around the leakage and diffusion area; Ask in detail whether there is leakage or combustion, and whether there is explosion; The amount of leakage, whether liquid phase or gas phase leakage can be helped; General layout of storage tank area, leakage tank capacity and actual reserves; Reserves of adjacent tanks, total storage capacity, whether leakage stoppage can be implemented, whether backflow measures can be taken, etc

2. Reconnaissance and detection. After the fire brigade arrives at the scene, use the detector to detect the gas concentration at the scene of the accident; Determine the wind force and direction around the site; Search for people in distress and trapped, and quickly organize rescue and evacuation

3. Set up alert. According to the situation of reconnaissance and detection, determine the warning range, set warning signs, arrange warning personnel, and strictly control the entry of personnel; During the whole disposal process, the gas concentration in the surrounding areas of wind and wind direction and diffusion shall be continuously detected, and the warning range shall be adjusted in time