Fire hazard classification of R134a systems
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R134a is produced from hydrogen fluoride and trichloroethylene through a two-step reaction. The fire hazard of trichloroethylene is classified as Category B; R143a is generated during the reaction process, and there are recovery facilities for R143a (towers, storage tanks, condensers). The lower explosion limit of R143a is 9.5%, so it should be classified as a Category A flammable gas. Then should the fire hazard category of the R134a production facility be classified as Class A?
Yes, it must definitely follow the principle of choosing the higher option rather than the lower one.