Air Venturi Blew out the 6K Burst Disc.

[Freddy J]

While changing out the Bottle on my Avenge X. I blew out the Burst Disc that is rated at 6K. Pressure in the bottle was less than 4K. What could have caused this.
This is the second Burst disc while doing this.

 

[TMH]

Burst disks flex every time the gun fills and empties. Over time this can fatigue the metal and the disk will rupture, even though the burst pressure was not achieved. I saw this all the time many moons ago when I worked in a SCUBA shop and was filling tanks. No matter how often it happened, you still jumped every time one let go.

Alternatively, if this is happening too often (in your mind), there might also be maybe a machining blemish on the seat or on the hollow bolt which holds the disk in place. If a burr or something is damaging the burst disk just a little bit when it is being installed, this will also lead to a shorter service life.

Or, since all burst disks you seem to be able to get these days come from China, it might just be a disk quality issue.

Just don't get to the point where you are tired of replacing them, and move to some with a higher rated pressure - DANGEROUS!

 

[6gun]

Burst disks flex every time the gun fills and empties. Over time this can fatigue the metal and the disk will rupture, even though the burst pressure was not achieved. I saw this all the time many moons ago when I worked in a SCUBA shop and was filling tanks. No matter how often it happened, you still jumped every time one let go.

Alternatively, if this is happening too often (in your mind), there might also be maybe a machining blemish on the seat or on the hollow bolt which holds the disk in place. If a burr or something is damaging the burst disk just a little bit when it is being installed, this will also lead to a shorter service life.

Or, since all burst disks you seem to be able to get these days come from China, it might just be a disk quality issue.

Just don't get to the point where you are tired of replacing them, and move to some with a higher rated pressure - DANGEROUS!

Fantastic points, plus corossion from moisture.

I've moved up 1k psi before, but still under the bottles test pressure. Safety is a personal choice here. I tend to pay attention and have redundant measuring of fill systems and have regulators for filling all of it.

 

[PumaCarl]

Your gauges could also be wrong too. Lately I have been seeing some really inaccurate gauges showing up on new guns and replacement gauges that I bought, that were supposedly checked.

 

[Freddy J]

My Compressor has a hard time reaching 4K.

 

[Freddy J]

Burst disks flex every time the gun fills and empties. Over time this can fatigue the metal and the disk will rupture, even though the burst pressure was not achieved. I saw this all the time many moons ago when I worked in a SCUBA shop and was filling tanks. No matter how often it happened, you still jumped every time one let go.

Alternatively, if this is happening too often (in your mind), there might also be maybe a machining blemish on the seat or on the hollow bolt which holds the disk in place. If a burr or something is damaging the burst disk just a little bit when it is being installed, this will also lead to a shorter service life.

Or, since all burst disks you seem to be able to get these days come from China, it might just be a disk quality issue.

Just don't get to the point where you are tired of replacing them, and move to some with a higher rated pressure - DANGEROUS!

The latest one to burst, was just received from PA. Since this has happen to two in a week, I think its time to send it to Air Ventori for a seal job. It had worked fine for over a year.

 

[6gun]

If its brand new and blowing 6k discs there's a problem. The bourbon tubes on all import guages are going to get a memory or are completely inaccurate(depending on your thresholds) ime so maybe the compressor is achieving higher psi than it's showing. Budget burst discs are a headache too. Ive blown plenty of 5 and 7k discs, but only from leaving 100% cool air filled cylinders in a hot vehicle. The more chinesium the discs the farther on the low side of their rating they tended to be, and the faster small amounts of moisture corroded them.At least for me. This isn't dogma it's only my anecdotal experiences.

 

[Mike_OH]

“ The bourbon tubes on all import gauges are going to get a memory or are completely..”

Did spell check get you or is there another aspect to this hobby I don’t know about yet?!