Will high pressure behind the rupture disc cause it to burst?
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Our company’s vent pipes are equipped with three levels of ventilation; both the second and third levels have positive-dome type rupture discs. The diameter of the pipes at the second level is 250 mm, while it is 400 mm at the third level. The burst pressure of these rupture discs at 40°C is 50 kPa ± 25%. A nitrogen gas shield is installed behind the rupture discs, with the normal pressure of this nitrogen gas being 0.5 Mpa. There are throttle orifice plates in the nitrogen gas pipeline; a few days ago, the pressure of this nitrogen gas reached 0.66 Mpa. Now, both the rupture discs at the second and third levels have burst. Upon checking the recent pressure curves, no abnormalities were found, so it’s unlikely that the high pressure of the nitrogen gas behind the rupture discs was the cause.
Check whether the vent on the other end under nitrogen protection is unobstructed; in any case, the rupture disc will burst whenever either side of it is under pressure
Ensure that the pipeline downstream of the rupture disc is unobstructed; additionally, checking the direction in which the rupture disc breaks can also provide information
The other end is unobstructed, the flame nozzle of the torch
Thank you. I’ve checked and it’s not reverse blasting; it probably isn’t due to high nitrogen pressure
Thank you; I haven’t found the reason yet. We’ll discuss it once it’s identified
In that case, it’s related to the pressure difference, right?
There might be an issue with the pressure selection; also, the blasting tolerance seems too high
Are rupture discs the only option for secondary and tertiary venting, or are they used only as bypasses for staged venting? It is recommended to study the rupture disc carefully, and determine whether it is a positive burst or a reverse burst based on the deformation of the rupture disc. It is possible that an explosive mixture was formed behind the rupture disc, which was ignited by the perpetual flame of the flare, resulting in a detonation; the shock wave then destroyed the rupture disc in the opposite direction.