Inline deflagration flame arresters should be used only where the L/D ratio is less than 50 for hydro- carbon/air mixtures and less than 30 for hydrogen/air mixtures; detonation flame arresters are used with longer lengths or where the location of the ignition source is not known.

Do I need a flame arrestor?

If the flame could occur from either direction then a bi-directional flame arrester is required. In-line flame arresters can be either deflagration or detonation arresters depending on the conditions under which they are to be used.

Where are flame arrestors used normally?

Flame arrestor technology is widely used across the process industries: … including refining, pharmaceutical, chemical, petrochemical, pulp and paper, oil exploration and production, sewage treatment, landfills, mining, power generation, and bulk liquids transportation.