flame arrester

Rupture discs and Safety valves may be used independently as primary safety devices or in conjunction.
Flame arresters (arrestors) are safety devices whose principal purpose is to prevent a flame entering or leaving a pipe or vessel or to prevent it travelling further down a pipe. Different types of flame arresters, designed to handle different types of flame events:

End-of-Line Flame Arresters
In-Line Deflagration and Detonation Arresters