Staged pressure relief assembly

Details Staged pressure relief assembly Staged pressure relief assembly

1987-11-27

1988-10-18

Rivell, John

Fluid handling

Processes

Involving pressure control

137 681, 220 89A, F16K 1740

Patent

active

047779748

ABSTRACT:
A pressure relief panel assembly for rupture discs, explosion vents and the like has a plurality of frangible panel portions which burst at different pressures to present a pressure relieving aperture having a cross-sectional area which varies in accordance with the number of panel portions which have ruptured. In one embodiment of the invention, the assembly comprises two frangible panels positioned in face-to-face relationship in covering disposition to a vent opening, and the innermost panel has an orifice which functions as a pressure relieving aperture once the outermost panel ruptures; subsequently, further build up of pressure causes the innermost panel to burst and present a pressure relieving aperture larger than the orifice so that the structure to be protected is fully vented. In certain forms of the invention, a discontinuous pattern of perforated lines of weakness in the innermost panel serve as pressure relieving apertures once the outermost panel ruptures. In another embodiment, the assembly comprises a single panel having one set of weakness lines defining a first frangible panel portion and a second set of weakness lines surrounding the first set and defining a second frangible panel portion.

REFERENCES:
patent: 1584523 (1926-05-01), Egbert
patent: 2766904 (1956-10-01), Philip
patent: 2954897 (1960-10-01), Hausen
patent: 3362742 (1968-01-01), Sanderson
patent: 3445032 (1969-05-01), Raidl
patent: 3698598 (1972-10-01), Wood
patent: 4498261 (1985-02-01), Wilson
Abstract Ouger, Pressure relief, 97051, 1-22-52.

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