Pneumatic burst valve - what's it's real name?

Gallery, Projects and General > How do I??

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75Plus:
Google "Rupture Disc" then separate the mechanical from the medical.

Joe

Stilldrillin:

Would a toy steam engine safety valve do the job?

http://www.mamodparts.com/spares-Safety_Valve.asp

Usually rated at 15psi.

David D

David Jupp:

--- Quote from: daz on November 15, 2011, 06:12:12 PM ---Forgot to say that the size you will need will be 1.6 times your working pressure ...
--- End quote ---

1.6 times working pressure seems very high for a relief device. I'd expect the test pressure for the container to be something like that.

The relief device should be sized (discharge area) such that the container can't be overpressured (typically no more than 10% above max working pressure) - make sure it is big enough, remembering that there is less driving pressure to get the air out than you compressor could have available to force it in (unless fitted on inlet pipe).

Depending on the rupture disc style, there may be the potential for fragments to be ejected on operation. Consider where these might fly to.

John Rudd:
You could incorporate a bursting disc into a small pipe section such that if it ruptures then the air is dissipated to a safe location...

The bd need be no more complicated than a disc with score lines across the diameter to create the weak point, mount the bd between two flanges connected to your piping arrangement....the disc doesnt have to be made from metal! You could work out somewhere near the force required to rupture based on the surface are of the disc and the desired rupture pressure...
On other thing, the diameter of the relief line needs to be bigger than the supply...

daz:
:doh:You are right of course, I was getting a bit mixed up. Pressure test is 1.6 times max working pressure, safety valve should be around 10-15 percent higher than normal working pressure. It's been a while since I had to do anything like this.

Daz

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