In a pressure relief with a set point at 50 psig and I was looking at using a rupture disk as an alternative to a spring seated design. The device will have to be small (<.875" OD) so finding an off the shelf has been difficult If you really want a rupture disc, Dbaird is correct to contact directly the manufacturer(s) of discs to solicit their recomendations. Others are Oseco (Tulsa, I think) and Continental Disc Corporation (Kansas City). Putting a special rupture disc on a 3/4" nozzle, buying spare discs, etc., will probably wind up being more expensive than buying a small safety-relief valve. Also TD2K brings up an interesting point about fatigue: a tension-type rupture disc typically has an operating to burst ratio of 70 percent. If you go over 70% of burst in service it probably won't burst the first time, but the next time you exceed 70% it will probably blow. A SRV or a buckling pin will not experience that AND a SRV will reseat so there is less mopping to do after the event.

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