Abstract: A clean agent fire suppression system (10a, 10b) is provided that avoids mixing of the agent and propellant. A compartmentalized storage vessel (12) having two compartments (20, 22) separated by a membrane (24) maintains a propellant supplied by a propellant source (34) isolated from the fire suppressing agent. The fire suppressing agent may be stored at room temperature and/or under atmospheric pressure and, upon actuation of the system, delivered to the nozzles (16) installed within the protected space (18) at much lower pressures. This reduction in delivery pressure decreases noise generation as the suppressing agent is released into the protected space.

Abstract: A reverse-acting pressure relief device (10) is provided comprising buckling-control structures, namely pocket regions (20, 22) and belt regions (24) having differing material thicknesses. The pocket regions (20, 22) generally comprise areas of reduced material thicknesses and serve to weaken the structural integrity of the bulged section (12) of device (10) so that reversal can be initiated at lower pressures. Belt regions (24) generally comprise areas of enhanced mechanical properties that assist with reversal control and opening of bulged section (12) thereby ensuring complete opening of the device (10).

Abstract: A pressure relief device and method of making the same are provided. The pressure relief device includes an over-pressure relief area with a plurality of co-linear spaced apart recesses located thereon. Gap segments are interspersed between the recesses to define a line of opening having desired performance characteristics during opening of the over-pressure relief area.

Abstract: Pressure relief devices comprising circuitry for sensing operational conditions associated with the device are provided. The device generally comprises a nonconductive coating applied to at least a portion of a face of the device and an electrically conductive ink is applied there over. The electrically conductive ink is capable of carrying an electrical signal that is indicative of an operational condition associated with the device, such as device integrity, temperature, or pressure conditions.

Abstract: A reverse-acting pressure relief device (10) is provided comprising buckling-control structures, namely pocket regions (20, 22) and belt regions (24) having differing material thicknesses. The pocket regions (20, 22) generally comprise areas of reduced material thicknesses and serve to weaken the structural integrity of the bulged section (12) of device (10) so that reversal can be initiated at lower pressures. Belt regions (24) generally comprise areas of enhanced mechanical properties that assist with reversal control and opening of bulged section (12) thereby ensuring complete opening of the device (10).

Abstract: A pressure relief device and method of making the same are provided. The pressure relief device includes an over-pressure relief area with a plurality of co-linear spaced apart recesses located thereon. Gap segments are interspersed between the recesses to define a line of opening having desired performance characteristics during opening of the over-pressure relief area.

Abstract: A reverse acting rupture disc is provided having a laser defined electropolished line-of-weakness recess, and an improved method of forming an electropolished line-of-weakness recess in a reverse acting rupture disc that assures full opening of the disc upon reversal. A rupture disc blank is pre-bulged, final bulged, and then provided with a layer of resist material. A laser is used to remove at least a portion of the layer of resist material corresponding to a desired line-of-weakness recess in the concave face of the bulged rupture disc. The disc is then subjected to an electropolishing operation to remove metal from the lased area of the rupture disc, thereby forming a lustrous polished line-of-weakness recess in the disc of desired configuration and of a predetermined depth that is related to material thickness.