Low burst pressure corrosion resistant rupture disc assembly

A non-fragmenting, low burst pressure rupture device assembly for mounting between opposed, releasably interconnected flange members presenting a pressure relief orifice for a confined area under pressure, said assembly comprising:

• a relatively thin, flexible, fluid impervious sealing element adapted to be mounted between said flange members across said orifice in fluid release blocking relationship to said confined area;
• a support member for the element configured to be mounted between said flange members in supporting relationship to the element downstream of the confined area,
• said support member being provided with relieved areas defining a section which gives way and opens up when the fluid pressure, as sensed by the section by virtue of translation of the fluid pressure to the section through the sealing element bearing thereagainst reaches a pre-determined level only slightly greater than an acceptable operating pressure within said confined area,
• said element having an integral, peripherally extending deflected part presenting a bulge joining the portion thereof engaging said section of the member with the remainder of the element and extending substantially around the perimeter of said section which allows said portion of the element to freely move with said section during any shifting thereof that may occur upon sensing of pressurization of the area or of fluctuations of pressure therein below said pre-determined level thus assuring that opening of the section by a rise of pressure in said area is substantially independent of and essentially unaffected by the inherent burst pressure characteristics of the sealing element;
• and
• plate means secured to the sealing element on the face thereof opposed to said support member and operable to effect full opening of the sealing element upon rupture of said section at least to the extent of the aperture presented by opening of said section.