Flow rate of flammable and explosive gas vent pipes
Thread Content
A chemical processing unit is being designed that does not have a flare; instead, the gas released from safety valves and rupture disks is collected and discharged directly through an exhaust main. The gas being discharged is flammable and explosive. What flow rate is appropriate for this exhaust main? The main concern is static electricity generated in the pipes causing an explosion. Are there any standards I can refer to?
Can flammable and explosive gases be released directly?
Flammable and explosive gases cannot be vented directly.
However, many small chemical processing units these days do not have flares; instead, a flame arrester is installed on the main pipeline for direct venting.
Generally not exceeding 0.5 Mach, usually around 0.2 Mach； The velocity at the hydrogen vent outlet shall not exceed 100 m/s.