Burst disk rupture while filling 6351

[divezonescuba]

So, I was filling a 6351 tank that just passed hydro / visual eddy / VIP. The compressor was at about 2950.

The "failure" was quite startling. At first I thought the cylinder had ruptured as it was a 6351. Turns out that it was the burst disk.

So, the question is how many of you who fill tanks, regularly change out burst disks? Should this be done every five years at every hydro?

I don't recall this coming up at either my cylinder inspection or gas blending courses.

 

[Wookie]

So, I was filling a 6351 tank that just passed hydro / visual eddy / VIP. The compressor was at about 2950.

The "failure" was quite startling. At first I thought the cylinder had ruptured as it was a 6351. Turns out that it was the burst disk.

So, the question is how many of you who fill tanks, regularly change out burst disks? Should this be done every five years at every hydro?

I don't recall this coming up at either my cylinder inspection or gas blending courses.

I do it every year when I O2 clean my valves. That's when I scrap my 6351 cylinders too.

 

[tbone1004]

burst discs should be replaced at hydro as part of the full valve rebuild. I've never understood why the industry thinks regulators need to be serviced every year but valves don't....

 

[rjack321]

replace mine every few years, (less often than annual, more often than every 5yrs)
all my 6351 tanks are long gone - you won't ever mix up one of them exploding with a burst disk rupture

 

[redacted]

I have 7 tanks that I have had for 15+/- years and have never replaced a burst disk.

 

[Wookie]

I have 7 tanks that I have had for 15+/- years and have never replaced a burst disk.

How often do you rent them out?
Or put O2 in them?
Back when we did air only we didn't replace burst discs either. When you are in the business, the standards are a little higher, if only that you have a target on your back.

 

[rjack321]

I have 7 tanks that I have had for 15+/- years and have never replaced a burst disk.

Once you lose a $100 worth of trimix or arrive at a site many hours away and find you can't dive then you might decide to change them.

 

[redacted]

Yes, I do understand where certain risk factors may impact the decision to replace burst disks as a preventative measure, but I suspect they just do not apply to an overwhelming majority of recreational divers.

 

[shurite7]

I agree with tbone, replace the burst disc every 5 years when the valve is rebuilt, which is recommended by CGA. Sadly, most people whom I've spoken with stated if it isn't required then there is no need to rebuild a valve let alone change the burst disc.

 

[rjack321]

Eventually they are just welded into the brass with green copper goo and rebuilding is more hassle than its worth at that point. Although some valve parts are so expensive that replacing is almost more cost effective for some things like older OMS valves.