2 replies to this topic

[proinwv]

I have a client who wishes to use a burst disc as final protection on a low pressure tank. Burst pressure to be 2.5 psig with an air flow of 46,000 scfh.

The problem is that most manufacturers discs require a very large device, say about 20" to achieve this low pressure.

Does anyone know of a manufacturer who has discs of a smaller diameter for these parameters?

(I am going to recommend to my client that he consider a tank vent which will be a smaller device, and also re-seatable. But lacking his approval, I will need to see what I can find.)

Thanks

[djack77494]

Paul,
You have a pretty significant air flowrate with a small delta P to move that flow. The high flowrate/low dP combination invariably leads to large devices. Nonetheless, a rupture disc should be about the minimum size option since, once burst, it offers little resistance to flow. My guess is that a vent valve (conservation valve?) would be larger and more costly. Also, whatever rupture disc supplier you use should offer a wide variety of sizes, including quite small RD's. I would check with a second supplier for a size recommendation; if the two agree, then check with a supplier of an alternate device such as Protectoseal for conservation vents or a rupture pin device supplier for a comparison of prices & sizes. I'd be very surprised if the RD was not the low cost/minimum size device.
Good luck,
Doug

[JoeWong]

I just try to analyse from common sense...

When disc is opened, it is like an "orifice". This would be similar to other device i,e, PVSV...with such low dP, the "orifice" size won't be significantly small... if a vendor propose a significantly small device, i guess you may have to double check their calculation and basis...

On the hand, re-seatable device i.e weighted disc may be considered.