Abstract: A support ring adapted to support a rupturable rupture disc member in a rupture disc assembly. The support ring includes an upper surface, a lower surface, a central aperture defined by an inner peripheral edge and at least one tear-initiating projection, and having a cutting means extending inwardly from the inner peripheral edge and below the upper surface and adapted to cut the rupture disc member. The cutting means includes a plurality a curved cutting portions, each of the plurality of curved cutting portions including an inner arc section extending closer to the inner peripheral edge than other portions of the curved cutting portion.

Abstract: In combination with a rupture disc assembly, there is provided an improvement by using a support ring having a projection and a continuous, generally clover leaf pattern cutting edge.

Abstract: In combination with a rupture disc assembly, there is provided an improvement by using a support ring having a projection and a continuous, generally clover leaf pattern cutting edge.

Abstract: An explosion door including a frame and door panel includes an improved latch mechanism for releasably securing the door panel to the frame with a retainer bar. The latch includes a pivoting latch housing having at a free end a magnetic contact and latch stop for contacting the retainer bar. A seal between the door panel and frame includes a rigid door stop component and a resilient seal. The retainer bar is mounted to the frame to permit the spacing between the bar and door panel to be adjusted in a stepwise manner.