The vent stack is equipped with a large bore flame arrestor fitted with temperature transducers to be employed when the vent stack is used as an atmospheric vent with a drill thru MGS.

In the event that a combustible mixture is present in an atmospheric gas line, the flame arrestor will prevent the flame from reaching the atmospheric MGS and causing an internal explosion. The temperature sensors send an alarm to the Managed Pressure Drilling (MPD) operator via the MPD SCADA control systems, and the flame can then be extinguished with a nitrogen purge of the flame arrestor.