Liquefied gas Liquefied gas generally refers to liquefied petroleum gas, which is a mixture of various low-boiling light hydrocarbons (C3~C5). The main characteristics of liquefied gas are: the boiling point range from -42.7 °C to -0.5 °C at normal temperature and pressure. From liquid to gas, the volume increases by about 250 times while absorbing a large amount of heat. The liquefied gas explosion limit is about 1.5% to 10%, the ignition energy is small, and a Mars can ignite. The relative density of the liquefied gas in the gaseous state is 1.5 to 2. Due to the large specific gravity, the liquefied gas will accumulate in the low-lying area when it leaks, or it will spread along the ground. Once the explosive concentration is reached, it will explode when it encounters the fire source. At the same time, liquefied gas has low toxicity. When the air content reaches 10%, people will be anesthetized in this environment for 2 minutes. Due to these dangerous characteristics of liquefied gas, liquefied gas has great risks in the production, storage and transportation. In recent years, a number of major fire and explosion accidents occurred during the loading and unloading process of liquefied gas tanks and liquefied gas tankers, which is shocking. . Accident: Shandong Linyi Jinyu Petrochemical "6.5" major explosion fire accident At about 1 am on June 5, 2017, Jinyu Petrochemical Co., Ltd., located in Lingang Economic Development Zone, Linyi City, Shandong Province, had a major explosion and fire accident. The accident killed 10 people and injured 9 people. The initial direct cause of the accident is: when a liquefied gas tank car is unloaded at the unloading stack, the quick joint bayonet is not firmly connected, the joint is broken, causing a large amount of leakage of liquefied gas, and the liquefied gas and the air form an explosive mixed gas. The ignition source exploded, causing other tankers in the loading and unloading area to explode one after another, and the explosive fragments hit and ignite multiple devices or equipment in the plant area. The accident is fiercer than the tiger, and the safety of the liquefied gas automobile tanker must be taken seriously! The liquefied gas automobile tanker is connected with the liquefied balloon tank during loading and unloading. The tanker or tank area has a large storage capacity and high pressure. The liquefied gas is flammable and explosive. It has combustion accompanied by explosion, large destructiveness, high flame temperature and strong radiant heat. The fire has a large initial area and is prone to a secondary explosion. In the event of an accident, it is extremely easy to cause serious harm or threat to people's lives and property. To ensure the safety of liquefied gas car tankers, you need to know more than that! Overview 1. Liquefied gas automobile tanker (hereinafter referred to as automobile tanker) refers to a tank car that is suitable for transporting liquefied gas with a maximum working pressure of 0.1 MPa or more and a design temperature of not more than 50 °C, and is a steel tank body; 2. The design, manufacture, use, transportation, inspection, repair and modification of automobile tankers shall comply with the requirements of industry standards and drawings, and shall comply with the State's regulations on automobile, transportation and other aspects; Use and transportation 1. The use and loading and unloading units of automobile tankers shall, in accordance with the relevant regulations of the public security, transportation and other departments, and the specific conditions of their own units, formulate corresponding safety operation procedures and management systems, and ensure the safety of personnel involved in operation, transportation and management. Technical education; 2. The escorts and drivers of automobile tankers should be familiar with the physical, chemical properties and safety precautions of the medium they are transporting, understand the relevant requirements for loading and unloading, and have the ability to handle faults and abnormal conditions; they must be trained and qualified. Qualification 3. The use unit of the automobile tanker must have the certified escort and driver of the unit, and the escort and driver should be equipped with special protective equipment and work clothing, special maintenance tools and necessary spare parts and spare parts; 4. The user must formulate and conscientiously implement the daily inspection and maintenance system of the automobile tanker according to the requirements of the instruction manual for the automobile tanker. Regularly check the safety accessories (including safety valves, rupture discs, pressure gauges, liquid level gauges, thermometers, emergency cut-offs). Performance of equipment, pipe joints, manholes, pipeline valves, static conducting devices, etc., with or without leakage, damage, etc.; 5. The loading and unloading unit of the automobile tanker shall have the following conditions before it can be engaged in loading and unloading operations: 1). Have familiar with the safety management personnel of automobile tanker transportation and loading and unloading, be responsible for the safety technical work of automobile tanker loading and unloading; have the operators who have passed the professional training and assessment; 2) have the loading and unloading operation management system of automobile tanker; 3). Special site for fire prevention or anti-virus and explosion-proof regulations, and a sufficient number of protective equipment and spare parts; 4). Regular inspection system for loading and unloading equipment and pipelines; reliable connection method for loading and unloading pipelines; rated working pressure of loading and unloading pipelines is not lower than loading and unloading 4 times the maximum working pressure of the system; 5). There must be a measuring device that has been inspected by the metrological department and issued a certificate of conformity or periodic inspection certificate; 6). A special person must be responsible for the inspection and recording before loading and unloading, and establish a file for reference; 7) . According to the fire hazard and the degree of medium poisoning in the production process, set up the necessary exhaust, ventilation, pressure relief, explosion prevention, tempering prevention, static electricity discharge, emergency discharge and automatic alarm and fire protection. Safety accessory 1. Safety valves, rupture disc devices, emergency shut-off devices, liquid level gauges, thermometers, pressure gauges, loading and unloading valves, etc. used in automobile tankers shall comply with the corresponding national standards and professional standards. The use unit must use the rupture disc device produced by the manufacturing license unit and the emergency cut-off device qualified by the relevant department; 2. A set of built-in emergency shut-off devices must be installed at the interface between the tank body and the liquid phase pipe and the gas phase pipe to make an emergency stop when a large amount of leakage occurs in the pipeline; the emergency shut-off device includes an emergency shut-off valve, a remote control system, and The fuser automatic cutting device requires flexible operation, reliable performance and easy maintenance. The closing operation of the remote control system shall be installed at a position that is easily accessible to personnel. The automatic disconnecting device of the fusible plug shall be set to automatically close the position of the emergency shut-off valve when the ambient temperature rises. The emergency shut-off valve shall not be used for other purposes. When the tanker is running, the emergency shut-off valve shall be in a closed state; 3. For automobile tankers carrying flammable and explosive media, a reliable static conducting grounding device must be installed. The resistance at the junction between the tank piping, valves and the vehicle chassis should not exceed 10mΩ. It must be well grounded during parking and loading and unloading operations. Iron chains are strictly prohibited. When loading and unloading, connect the grounding conductor of the tank and ground equipment, and the cross-sectional area should be no less than 5.5mm2. Isolation Clothing,Sterile Protective Clothing,Plastic Protective Clothing,Cheap Protective Clothing GUANGZHOU HTD INTERNATIONAL , https://www.maskhtd.com
To "play" the liquefied gas car tanker, you need to know more than that!