Rupture Disc

A rupture disc is a non-reclosing pressure relief device used as a safety component in chemical manufacturing systems. It is a sacrificial membrane installed in the pressure boundary of a vessel or piping system. Its primary function is to protect equipment from overpressure by rupturing at a precisely calibrated set pressure, creating a full-bore opening for rapid pressure discharge. Once ruptured, the disc must be manually replaced; it does not reseal. The disc is typically a thin, scored, or formed membrane made from materials such as stainless steel, Inconel, Hastelloy, graphite, or composite materials. The burst pressure range is 0.1–10 MPa with a tolerance of ±5%, per ISO 4126-2. Operating temperature range is -40 to 200 °C, and nominal diameters range from 15 to 600 mm. The maximum operating pressure ratio is 0.9, meaning the operating pressure should not exceed 90% of the burst pressure to avoid fatigue. The flow coefficient ranges from 0.62 to 0.73, depending on type and size, per ISO 4126-1. Leak tightness is helium leak tested to 1×10^-6 mbar·L/s, and cyclic life is 10,000 cycles at 80% of burst pressure. Weight varies from 0.5 to 50 kg. These values are reference ranges; model-specific values must be verified with the manufacturer. The disc is selected based on system design parameters, including burst pressure, temperature, diameter, and material compatibility. It is often used in conjunction with a safety valve, but it can also be used alone. The rupture disc is a critical safety component that must be installed correctly and replaced after activation. Standards such as ISO 4126-2 and ASTM A240 are procurement references; compliance must be confirmed with the supplier.

The rupture disc is a thin membrane with pre-weakened points, installed in the pressure boundary. When system pressure exceeds the disc's burst rating, the membrane fails along these weak points, creating a full-bore opening for rapid pressure discharge. The disc remains open until manually replaced. The burst pressure is precisely calibrated, and the disc is designed to rupture at that pressure to prevent catastrophic failure of the protected equipment. The disc does not reseal after activation.