Blow out plugs

[standingup]

A house fire with Scuba tanks inside is probably one of those nightmares firemen don’t want to think about.

Our volunteer fire dept always did an interview before going into structures. On one garage fire I asked the owner if there was anything hazardous being stored in the garage. Absolutely not was the reply. While trying to reduce the smoke to gain some visibility my hose partner ran out leaving me with the nozzle. After reducing the smoke I was able to see several 5 gal gas containers- tires- spray paint cans- keroscene-and propane tanks. I guess the owner thought I meant NUCLEAR WAR HEADS when I asked about hazardous materials. The point in all of this is any info you can provide to the fire dept is really appreciated.

[Nemrod]

standingup, I am not especially fancy with my lettering. I just use a Sharpie with the thick point. If it wears off I just redo it. You might stencil and paint it if you like. I write it on the neck/shoulder just below the valve so it is in plain sight. This way the fill station people don't have to guess. I usually stay with my tanks anyways and the local shops let me fill them myself or at least assist.

James

[treasureman]

Are these plugs carried by any scuba supplier like marvel or anyone?

[eskimo3883]

Hi,

I need to replace the lead ones as well. have 1800 psi & 2250 psi tanks but am not clear on their availability. Do I need to buy 1800 psi burst disks and 2250 burst disks or just use 3000 psi disks? Would moving to the 3000 psi disks put someone in jeopardy?

[luis]

Hi,

I need to replace the lead ones as well. have 1800 psi & 2250 psi tanks but am not clear on their availability. Do I need to buy 1800 psi burst disks and 2250 burst disks or just use 3000 psi disks? Would moving to the 3000 psi disks put someone in jeopardy?

You should have no trouble finding burst disks /plugs for 2250 psi tanks. You also be able to find them for the 1800 psi ones but that may be harder.

I would definitely recommend against using burst disks for 3000 psi tanks on a 2250 tank (I realise cave divers did it, but then again that is cave diving ).

Using a disk for a 2250 on an 1800 psi tank is not ideal, but it is better than nothing.

My understanding is that bust disks are design to let go at 40% above working pressure. Hydro test pressure pressure is at 5/3 (or 66 % above working pressure) for most vintage steel tanks.

[treasureman]

I bid on the blow out plugs on e bay, and got them for a pittance. While the stiker says for use in Thermos 3000 psi valves, there was another sticker underneath that said for use in USD valves only.

In any event. the burst disk seems to not be a separate part, it seems to be integrated with the screw in plug.

Any comments on this last part. Am i missing something.??