Enhanced reverse buckling rupture disc

Details Enhanced reverse buckling rupture disc Enhanced reverse buckling rupture disc

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 17/16 (2006.01)

Patent

CA 2560499

An improved reverse rupture disc for use as a safety pressure relief device is provided. The disc is defined by an annular flat flange region, a concave-convex disc dome region and a transition region that joins the disc-shaped flat flange region to the concave- convex disc dome region. One or more deformations may be formed at or near the apex of the disc dome region for weakening the disc to the point that incidental damage to the disc will not weaken the disc any further, thereby ensuring that the disc will reverse at a certain pressure, and no lower. The disc may also formed with one or more irregular transition regions at the base of the disc and a partial circular groove in the transition region. The irregular transition region of the disc cooperates with a shear enhancing means such as a protrusion or notch formed in a support ring or disc holder disposed downstream of the disc to sever the disc dome from the annular flat flange region along the groove in the transition region. A back pressure support means extends over the transition region and potentially over the dome region to prevent vacuum and forward to reverse cyclical pressures in the convex direction from damaging or destroying the disc. An ungrooved region of the transition region acts as a hinge holding the ruptured disc dome to the flat flange region after the disc has ruptured. The ruptured disc dome hangs over an arcuate projection formed in the support ring or disc holder, which helps to prevent the disc from fragmenting.

L'invention concerne un disque de rupture inverse perfectionné pour servir de dispositif de protection contre la surpression. Le disque est défini par une zone bride annulaire plate, une zone dôme de disque concave-convexe et une zone de transition qui joint la zone bride annulaire plate à la zone dôme de disque concave-convexe. Une ou plusieurs déformations peuvent être formées au sommet de la zone dôme de disque au point qu'un dommage accidentel subi par le disque ne l'affaiblira pas encore plus, ce qui garantit que ledit disque va s'inverser à une certaine pression, et non au-dessous de cette pression. Le disque peut également posséder une ou plusieurs zones de transition irrégulières à sa base et une rainure circulaire partielle. La zone de transition irrégulière du disque coopère avec un moyen favorisant le cisaillement tel qu'un élément saillant ou une encoche formés dans une bague de support ou porte-disque placé en aval dudit disque. Un moyen de support de contre-pression s'étend sur la zone de transition et potentiellement sur la zone dôme pour empêcher que la pression à vide et les pressions cycliques inverses dans la direction convexe endommagent ou détruisent le disque. Une partie non rainurée de la zone de transition agit comme une charnière destinée à maintenir le dôme de disque rompu. Le dôme de disque rompu est pendu sur une projection arquée formée dans la bague de support ou le porte-disque, ce qui empêche le disque de se fragmenter.

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