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low pressure (50 psi) rupture disk

low pressure (50 psi) rupture disk

low pressure (50 psi) rupture disk

(OP)
We're designing 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

RE: low pressure (50 psi) rupture disk

I would check with Fike

Fike Corporation World Headquarters
704 S. 10th Street
Blue Springs, MO 64015
USA
Tel: +1-816-229-3405
Fax: +1-816-228-9277
Email: fpssales@fike.com
http://www.fike.com/

David Baird
Sr Controls Designer
EET degree.
Journeyman Electrician.

RE: low pressure (50 psi) rupture disk

I don't have experience with "off-the-shelf" rupture discs so I'm not sure what might be available unless it is something like that used on gas cylinders.  You may want to do a search for CGA (Compressed Gas Association) type rupture discs to see if any of them suit your needs.  I do see that Oseco has a specialty line of "throw-away" units that you might consider.
http://www.oseco.com/pages/products/specialty/otu.html

Just be sure to select one that is suitable or certified for use on the equipment you are trying to protect.

RE: low pressure (50 psi) rupture disk

I would also consider a buckling pin device.  In my opinion, they are much preferred over a rupture disc since they have no fatigue issues and can operate closer to set pressure.

http://www.rupturepin.com/rpworks.html

RE: low pressure (50 psi) rupture disk

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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