Rupture disk tail pipe routing?
Rupture disk tail pipe routing?
(OP)
I have seen a tail pipe on a rupture disk directed within the same dike as the tank it protects. The tank contains class 1B flammables, it is the only tank in the dike and the disk will be set at 13 psig (15 psig tank). The only source filling the tank is from periodic transfers from a tank truck.
A fire that might result in the overpressure would be from a leak involving that tank or the pumping system associated with that tank. What makes this practice acceptable or not acceptable?
A fire that might result in the overpressure would be from a leak involving that tank or the pumping system associated with that tank. What makes this practice acceptable or not acceptable?





RE: Rupture disk tail pipe routing?
API RP-521 gives criteria to meet when venting flammable vapors such as ensuring dispersal so a flammable mixture isn't created at grade or in surrounding structures. Generally, it is not recommended to vent flammable liquids to atmosphere and there are other methods of disposal which are discussed for liquid relief events.
It is unclear from your description if the rupture disc tail pipe is directed upwards or downwards. I would have concerns if it were directed down even if there was not a possibility for liquid relief.
RE: Rupture disk tail pipe routing?
Hope this helps.
The more you learn, the less you are certain of.
RE: Rupture disk tail pipe routing?
Hope this helps.
The more you learn, the less you are certain of.
RE: Rupture disk tail pipe routing?
Since the flammable could be from the pump seal, and fumes can find ignition sources, I presume a fire could heat the vessel (uninsulated) and burst the rupture disk.
Once popped, I would think the gas from the tail pipe would catch on fire and the fire might propogate into the vessel along with air, if the heat rate was not great enough to have a high velocity jet(or when a water hose begins to cool that tank. What happens next, deflagration?, explosion?
RE: Rupture disk tail pipe routing?
RE: Rupture disk tail pipe routing?
On the flame arrestor, that depends on the flash point for the liquid, class of fluid, etc. It may be advisable.
The more you learn, the less you are certain of.