Bruchscheibe

Bruchscheibe, in English commonly referred to as a rupture disk or bursting disk, is a one-time safety device used to protect pressure vessels and piping from overpressure. It consists of a circular metal or composite disk that is pre-designed to fracture at a specified pressure, providing rapid relief of internal pressure by venting the process contents.

Operation and purpose

When the process pressure reaches the disk’s designed burst pressure, the weakened rupture area fractures and the disk collapses, creating an opening for venting. The device does not reseal after activation, so the disk must be replaced or reseated in a new assembly. It serves as a primary or backup relief element in systems where a fast, predictable release is required and where moving parts or springs would be undesirable.

Design and materials

Rupture disks are manufactured in metal or composite forms. Common materials include stainless steels and nickel alloys, as well as copper for certain fluids, chosen for chemical compatibility and temperature range. The disks are manufactured with predefined rupture geometries and tolerances to achieve accurate burst pressures. They are installed in rupture disk holders or assemblies that seal between flanges or fittings and may include features for venting, back-pressure management, or rupture indication.

Ratings and installation

Rupture disks are selected by burst pressure, temperature rating, material compatibility, and back-pressure considerations. Accurate installation requires matching the disk to its holder and to the connected piping or vessel, ensuring proper orientation and support. After a disk has ruptured, it must be replaced with a new disk to restore relief capability.

Applications and standards

Bruchscheiben are used across chemical, oil and gas, pharmaceutical, power, and water treatment industries for overpressure protection. They are commonly paired with secondary relief devices and are designed to meet industry standards and manufacturer specifications to ensure safety and reliability.