Burst disks???

[Reef]

So tonight I had a burst disk let go while in my hotel room. I had the tank filled at 9am and it let go 14 hours later. The tank is a HP100 and it had hydro and VIP 3 months ago. What concerns me the most is this had also happened with another one of my HP100’s a month ago. Ironically after staying at the same hotel and filled by the same people. The tanks were at 3600 psi after the fill each time. Is it normal to check the burst disk at hydro and VIP? The first tank is 12 years old, and the one today has a born on date of 6 years. After having this happen twice in a month I’m tempted to have all my tanks burst disks replaced. Advice?

 

[Bob DBF]

Is it normal to check the burst disk at hydro and VIP? The first tank is 12 years old, and the one today has a born on date of 6 years. After having this happen twice in a month I’m tempted to have all my tanks burst disks replaced. Advice?

There is no way to check a burst disk. I replace them at hydro.

 

[Searcaigh]

So tonight I had a burst disk let go while in my hotel room

How hot was that room?

 

[rx7diver]

When the cylinders went back to your LDS after hydro, and your LDS VIP'd them, weren't their cylinder-to-valve O-rings replaced and their burst discs replaced, too? Isn't this "normally" done?

If so, I wonder if the burst discs were replaced with the wrong "strength" burst disc.

rx7diver

 

[Tracy]

I replace them at hydro. For $5, it is a no brainer.

 

[Fibonacci]

In Australia, we are required to hydro test SCUBA tanks every year... but the burst disks are not routinely changed as part of the test unless you pay extra for a 'valve service'.
I change mine immediately if buying a second hand tank then every three years when overhauling the valve:

Check that burst disk...

So I swapped out the damaged San-o-Sub valve on my recently purchased used Faber 15L tank (the one with the crimped-in DIN insert) and got it hydro tested without any further issues... tank was all good inside. However, I pulled down the original valve for overhaul and possible reuse as a...

scubaboard.com

 

[Reef]

The room is 70 degrees. At my next trip to my LDS they will be replaced. It’s not worth the risk not doing it.

 

[rx7diver]

@Reef,

FWIW, there is an old thread (by @2airishuman, I'm almost sure) that contains a lot of useful info about burst discs and why they might go bad.

rx7diver

 

[Couv]

The room is 70 degrees. At my next trip to my LDS they will be replaced. It’s not worth the risk not doing it.

Were the disc replaced at last hydro? If so, were they replaced by the same shop and then had the same issue? Burst disk must:
A) Be matched to the working pressure of the tank. I.e. typically 5/3rd of the working pressure.
B) Be installed correctly. Correct installation includes one smooth operation and the proper torque.

BTW: (you did not hear this from me.) Sometimes one can give a slowly leaking disk a clockwise tweak and shut off the flow. I would only do this if I had a recreational dive to follow and then replace the disk.

 

[Johnoly]

... have all my tanks burst disks replaced. Advice?

So common Burst devices come in :
A ) 3360
B ) 4000
C ) 5000
D ) 5250
E ) 3/8-24 UNF
Which one will you choose if doing it yourself ?