Abstract: The fire extinguishing performance of compressed gas foam based on different types of gas on 120# solvent oil fires was compared by pool fire tests using a laboratory compressed gas foam system. The types of gas source and gas supply equipment suitable for ordinary class B fire were investigated. The results indicate that both compressed nitrogen foam and compressed air foam can extinguish 120# solvent oil standard fuel fires and have good anti-burning and anti-reburning performances under the condition of the foam solution foam application rate was 2.5 L/(min·m²). Compared with compressed air foam, compressed nitrogen foam has a slightly improved fire-fighting performance. However, the difference between them was not significant.For ordinary class B fire, it is recommended to directly use the existing nitrogen supply equipment as the gas supply source for places with nitrogen source in the actual project.

Key words: fire protection, compressed gas foam, class B fire, fire extinguishing performance