Repair and maintenance principles
1. In order to ensure that the performance of the flame arrester reaches the purpose of use, before installing the flame arrester, you must carefully read the instructions provided by the manufacturer, and carefully check whether the label and the installed pipeline are consistent.
2. The flow direction mark on the flame arrester must be consistent with the flow direction of the medium.
3. Check every six months. Inspect the fire barrier for defects such as blockage, deformation, or corrosion.
4. The blocked fire barrier should be cleaned to ensure that each eyelet is unobstructed, and the fire barrier that is deformed or corroded should be replaced.
5. When cleaning the flame arrester core, high pressure steam, non-corrosive solvent or compressed air should be used for cleaning, and no sharp hardware brushing shall be used.
6. When reinstalling the fire barrier, the gasket should be renewed and the sealing surface must be clean and free of damage, and no air leakage should be caused.
General selection principles
1. The flame arrester used should be safer than the flame propagation speed that can be achieved at the installation location.
2. The combustible gas transmission pipeline connected to the burner shall be provided with a flame arrester when there is no other flashback prevention facility.
3. To prevent flames propagating at subsonic speed, a deflagration flame arrester should be used, and its installation location should be close to the source of the fire;
4. To prevent flames propagating at sonic or supersonic speed, detonation detonation type flame arresters should be used, and their installation positions should be far from the source of fire.
5. Detonation detonation type flame arresters with different nominal diameters, see the table for the small installation distance from the source of fire.
6. For flame arresters used in cold areas, part or whole of the shell with heating jacket should be selected, and other heat tracing methods can also be used.
7. In special cases, a flame arrester with interfaces such as flushing pipes, pressure gauges, thermometers, and sewage outlets can be selected as required.
8. For flame arresters installed at the pipe end, threaded connections should be used when the nominal diameter is less than DN50; flange connections should be used when the nominal diameter is greater than or equal to DN50.
9. Flame arresters installed in pipelines shall be flanged.
10. The flame arrester installed at the end of the pipe shall be provided with a rainproof ventilation cover that can be automatically opened.
11. The flame arrester on each branch of the gas-phase communication pipeline between storage tanks should be detonation detonation type.
12. For the oil and gas discharge pipeline on the top of the storage tank, a detonation and detonation flame arrester should be selected at the connection with the tank top.
13. The detonation and detonation flame arrester should be used on the collecting pipe of the protective gas and oil and gas discharge pipeline on the top of the storage tank. Emergency venting tube should be set
14. Deflagration-resistant flame arrester.
15. A detonation detonation type flame arrester should be set between the gas and oil discharge (or recovery) header of the loading and unloading facilities and the gas phase pipelines of each branch line.
16. Before the flammable gas venting pipe is connected to the torch, if a flame arrester is installed, a detonation detonation flame arrester should be selected.