Rupture Disc Applications
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ASME CODE requires that when a Rupture Disc is used as a standalone safety device, the set burst pressure must be set to be less than the MAWP of the pressure vessel and be sized to prevent the pressure from increasing by more than 10% of the MAWP of the pressure vessel or 3 psi.
The ASME Code requires that when multiple safety devices are used, only one safety device must be set below the MAWP. The remaining safety devices, excluding the fire case, must not exceed 105% of the MAWP.
The pressure vessel must also be sized to prevent pressure from rising by more than 16% above the MAWP, or 4 psi.
A rupture disc device can be installed between the safety valve and the process or on the outlet side of the safety valve, provided sufficient discharge capacity is guaranteed.
This prevents leakage and water leakage through the pressure relief valve and protects the safety valve from corrosion. If installed on the inlet side, the actual discharge capacity is recognized as 90% of the discharge capacity stamped on the safety valve (or the actual capacity if tested under identical conditions).
When combined with a safety valve, the rupture disc must not impair the safety valve's function in the event of a rupture. Sufficient space must be secured between the safety valve and the rupture disc, and a device capable of detecting any pressure buildup (such as a pressure gauge, excess flow valve, or pressure switch) must be installed.
If additional hazards such as fire or other unexpected external heat sources could arise, additional pressure relief devices must be installed to protect against damage from overpressure.
In such cases, the relief device must have sufficient capacity to prevent pressure increases exceeding 21% of the MAWP. The set pressure must not exceed 110% of the MAWP.
For ambient temperature storage of liquefied compressed gases without a permanent supply connection, the primary purpose of the pressure relief device, which protects the pressure vessel from fire or other unexpected external heat sources, must be capable of preventing pressure increases exceeding 20% of the MAWP.
