Abstract: Pressure relieving fluid containers which provide a controlled rupture and pressurized fluid release when the pressure exerted on the container reaches a predetermined level. A substantially frustum-shaped indentation is included in a wall of the container and at least one score is formed on the part of the wall containing the indentation defining a rupture detachable blowout area. The frustum-shaped indentation is of a size with respect to the thickness of the wall containing it whereby when a predetermined fluid pressure is exerted on the wall, the indentation inverts and tears along the line of weakness created by the score thereby opening the portion of the wall corresponding to the blowout area and relieving fluid pressure therethrough.

Abstract: A two-way rupturable pressure relief apparatus adapted to be clamped between a pair of connection members connecting first and second pressure zones is provided. The apparatus is comprised of a rupture member including a plurality of openings therein, a support member including one or more arcuate slots defining a circular blowout portion and a hinge portion connected to the blowout portion therein positioned adjacent the rupture member and a flexible sealing member positioned adjacent the side of the support member opposite the rupture member. The sealing member is adhered to the support member whereby during the operation of the apparatus, the support member and the sealing member function as a single part and the sealing member is prevented from flexing except in the areas of the one or more arcuate slots in the support member.

Abstract: Rupturable pressure relief apparatus are provided which are less subject to damage and premature failure as a result thereof and which reliably rupture at very low pressure differentials. The apparatus are adapted to be clamped between conventional pipe flanges or annular support members and are basically comprised of a first circular rupturable member formed of solid flexible material and a second circular rupturable member also formed of flexible material positioned adjacent the first rupturable member. The second rupturable member includes a solid annular flange portion and a plurality of arcuate slots circumscribing a substantially circular central portion wth rupture tabs between the arcuate slots. Knife means having a cutting edge forming at least a portion of a circle are positioned adjacent the second rupturable member on the side thereof opposite from the first rupturable member so that when the second rupturable member ruptures, the first rupturable member is severed by the knife means.