Flame arrester technology

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1. Definition: A flame arrester is a safety device primarily used to prevent the spread of flames from flammable gases and vapors of flammable liquids. It is usually installed in pipes that transport flammable gases or on ventilated tanks to prevent flames from passing through. 2. The flame arrester is composed of a housing and a filter element; the housing must have sufficient strength to withstand the impact pressure generated by explosions, while the filter element is the key component that prevents the spread of flames. There are typically two types of filter elements: metal mesh filters and corrugated filters. 3. Classification 1) By performance: Flame arresters that prevent deflagration: Used to stop the spread of flames traveling at subsonic speeds. Deflagration-resistant flame arrester: Used to prevent the spread of flames traveling at sonic and supersonic speeds. 2) Classification by application: Vent flame arresters: Installed on the vent pipes of storage tanks or tank trucks, and are divided into end-mounted type and regular type. Piping flame arrester: Installed in closed piping systems to prevent flames from spreading from one end of the system to the other. 3) Classification by filter element structure: packed type flame arresters, plate type flame arresters, metal mesh flame arresters, corrugated type flame arresters, liquid-sealed type flame arresters. 4) Classification by gas classification: flame arresters suitable for Class I gases, flame arresters suitable for Class IIA gases, flame arresters suitable for Class IIB gases, flame arresters suitable for Class IIC gases. 4. Working Principle: The working principle of a flame arrester is based mainly on two mechanisms: heat transfer and the wall effect. Heat transfer is achieved by designing the flame arrestor’s internal components in such a way as to increase the contact area between the small flames and the wall of the channels, thereby enhancing heat transfer and reducing the flame temperature below its ignition point, and thus preventing the spread of the flame. The wall effect refers to the phenomenon where, as the burning combustible gas passes through the narrow passages of a flame arrestor, the probability of free radicals colliding with the walls of these passages increases, reducing the number of free radicals involved in the reaction and thereby preventing the combustion process from continuing. 5. Selection criteria 1) Flame arrestment performance: Depending on the application environment, an appropriate flame arrester should be chosen based on the possible speed of flame propagation. 2) Burn resistance: The flame arrester should have a certain level of burn resistance, so that in the event of an accident, operators have enough time to take emergency measures such as shutting off the gas supply or extinguishing the fire. 3) Pressure loss: The fluid pressure loss generated by the flame arrester during operation should not exceed the specified value to ensure the proper functioning of the system. 4) Air volume: The air volume of the flame arrester should meet the values specified by the manufacturing unit to ensure proper gas flow. 5) Test methods: The performance testing of flame arrestors should comply with relevant standards, such as GB/T 13347-2010 \"Flame-arresting performance and test methods for flame arrestors in petroleum and gas pipelines\", in order to verify their performance and reliability. 6) Safety performance: The flame arrester must pass explosion suppression tests, including continuous flame suppression tests and continuous detonation suppression tests, to ensure its safety under extreme conditions. 7) Static electricity bonding wires: The flame arrester should have appropriate static electricity bonding measures to prevent sparks from being generated due to static electricity accumulation. 8) Applicable media: The flame arrester should be suitable for the specific media in its installation environment, including gases, liquids, etc. 9) Environmental adaptability: The design of the flame arrester should take into account conditions such as temperature, humidity, and pressure in its installation environment. 10) Maintenance and upkeep: Choose flame arresters that are easy to maintain and service, in order to reduce operating costs and potential safety risks. 6. Maintenance and Care: When maintaining the flame arrester, it is necessary to regularly check whether there are any issues such as blockages, deformation, or corrosion in the flame arrestment layer, and to carry out any necessary cleaning or replacement. Furthermore, flame arrestors are safety devices, and enterprises should develop regular maintenance plans based on their own circumstances.