Abstract: A multiple-dome, scored rupture disc presents opposing first and second disc faces, and is provided with a circular, central region and a flat annular flange surrounding the central region. An arcuate line of weakness is formed in the disc circumscribing the central area except for a portion of the circumference of the central area defining a hinge about which the central region pivots upon rupture. The central region is divided by a diametrical ridge into two side-by-side semicircular halves within which the disc is bulged to form a plurality of separate concavo-convex bulges in the body.

Abstract: A fluid pressure relief assembly for a system operating under an elevated pressure includes a support structure having means defining a bore therethrough of desired cross-sectional configuration, the support structure being provided with a shoulder extending transversely into the bore and presenting a peripheral abutment surface which divides the bore into a first zone an a second zone. The assembly further includes a bidirectional relief means having a central frangible section, and means mounting the relief means across the bore of the support structure in normal flow blocking relationship thereto. A peripheral portion of the central frangible section is disposed to engage the shoulder for support thereby. The central portion of the frangible section within the innermost margin of the shoulder is constructed to undergo rupture only when the pressue in the first zone exceeds the pressure in the second zone by a preselected first magnitude.