1" MPT x FPT Rupture Disc Assembly

Hansen rupture disc assemblies (RDAs) are used to indicate which pressure-relief valve has discharged. A pressure-relief valve will re-seat after discharging, however, a rupture disc remains open after bursting.

Rupture disc assemblies provide a hermetic seal to help eliminate any possibility of minute losses of refrigerant via pressure-relief valve seat materials. They are designed with a welded construction. There are no gaskets to leak.

These assemblies are required when using Hansen pressure-relief valves for halocarbon applications because the high cost of such refrigerants demands extreme tightness. They are typically used between a vessel (or 3-way valve) and a pressure-relief valve. They must be used for atmospheric, not differential, pressure-relief.

In accordance with ASME code, a pressure gauge, or pressure switch must be connected to the space between the rupture disc and the connected pressure-relief valve to enable detection. Two 1/8 ̋ NPT side ports are provided in Hansen’s rupture disc assemblies for this purpose.

When a rupture disc assembly is installed with a pressure-relief valve, the stamped capacity of the pressure-relief valve must be reduced 10% for sizing purposes.

There is no guarantee of rupture disc life, therefore, routinely check for the presence of pressure between the rupture disc and relief valve to ensure that no leakage or rupture has occurred. If leakage is discovered at any time, immediately remove from service.

There are no user-serviceable parts in the rupture disc assembly, pressure gauge, or pressure switch. If the gauge or switch indicates “burst,” the rupture disc assembly and relief valve must be immediately removed from service. The rupture disc assembly is a one-time-use item. Pressure switches and gauges can be reused after verifying proper operation.

These rupture disc assemblies are not for liquid applications, nor are they applicable to differential relief valves to a lower pressure vessel.

Available pressure settings are 150, 250, 300, 350 and 400 (if listed), and selection of rupture disc assemblies must be at or below the pressure relief valves set pressure. This product does not come with any accessories listed, and as such, must be purchased separately.