Working in a shop I've seen burst disks on occasion, it's an attention getter. One thing I've seen that you didn't mention is that occasionally when they age they develop a miniscule pin hole at pressure. This results in you filling a tank to 3000 psi and putting it in the rental rack. 2 weeks later you test it before it goes out and it's at 2200 psi. What's happening, and you need to find it is fill the tank to pressure and submerge it is a tiny stream of fine bubbles from the disk. At some point the pressure drops enough for that the hole reseals and stay stable at that lower pressure. Can be a bit frustrating to trouble shoot. (Trust me on that) As always, top notch content from you.
Didn't want to cover disk leaks as that may be a follow-up video if this is well received. I serviced thousands of tank valves but never came across a leaking disk. Thanks for sharing Steve.
Very informative and never dry, as always. But there's something v e r y special about this vid. FINALLY we see Kevin, may be not in detail, but at least enough to prove he exists! How long have we been waiting for this. Look at the blue shiny surface of that compressor or what it is, starting at 08:53! Hooray Kevin!! You're not forgotten!!
SO I asked Kevin since he's the expert behind the camera. He said it's not him but a customer watching us. Kevin is like Bigfoot, everyone knows he exists but has never seen or filmed him. Keep watching Markus you may get him one day.
Thanks!, I read about it on the PADI Manual for Recreational Diving and could not imagine what it looked like and every other feature it has. Great zooms haha!
Went on a dive in Lake Jocassee SC yesterday, water temp 80 F spent 65 mins @ 25 feet or so; beautiful dive. The summer is ending too quick. I need to progress to dry-suit diving. Love the chan; something relaxing about a scuba instructor giving a lesson. Thanks Alex
Search for and watch my video on the "Vintage Scuba" playlist were I explain where the K and H valve reference actually come from. Hint, its a part number.
I knew you had to have a burst disc video! I heard recently that some cave divers love to install higher burst discs on their steel LP’s to get super high pressures. Obviously not recommended but interesting all the same.
Hey Alec, Miguel from the Conch republic. Wanted to point out, that tanks should be stored either full or empty, since in case of fire, like I saw in Rotan, they had a boat fire, full of scuba tanks half full, and they blew up, since they were not full enough to burst the disk, or empty enough, to not cause an explosion.
That was a one off event. No one plans to store a tank empty, its just left after the last dive. The tank your thinking of is at CoCo View resort as Kevin said its there in the dining room.
the burst disc is a major safety feature in the case the tank is caught in a fire, this will avoid a destructive explosion . It is a safety feature that protect from a destructive explosion in the case an overfilled tank left in an overheated automobile trunk. If you figure that a the tank contains the energy of a powerful compressor running for as much as 1/2 hour to fill one tank, you can imagine the energy accumulated. When this energy is sudently released ( say 1/100 second) you can imagine the power of the blast and the shock wave that is sufficiently powerful to blast you in a packet of miced meat .
I am currently finishing cave training in North Florida. In getting all of my own gear straight, my instructor has asked that I place 5000 psi rated burst disk into two Faber LP Steel 85s. They have been filling these tanks to around 3600 psi each (on average). Do you know why they have us use low pressure tanks for this? Is it a weight thing? And since I have to install these disk replacements myself (my local shop refuses to do it), do I need to add any type of lubrication before installing?
First, congratulations on taking cave training. It's a fun and demanding sport with no room for errors. Fabers LP's are rated 2400+10% (2,640), PSI fill pressure in North America. Why overfilling to 3600 is not something I can relate to but tech divers may. Suggest posting your question on www.scubaboard.com for expert tech divers input. May assure you all is OK or not but you decide what is right. A
Hello, quick question! Is it legally acceptable to have a cylinder valve without a burst disc? I have seen brand new aluminum cylinders with a new valve that doesn't seem to have a burst disc, and I am wondering if that is safe
All scuba tanks must have a burst disk of some sort. If you saw a new tank and valve it will have it but may be recessed and not as visible as older models. When it doubt, ask the tank owner to confirm it. A
I had a burst disk blow right next to me once. My ears were ringing for the next 3 hours and the valve was completely frozen. It was especially nice for making my drink cold. Still scared me to death though!
Hello, I have a question please get back to me,I have a kenko delphinus ce-05 underwater housing for camera full set up, with lights and all made and from japan do you know how much it would be all worth?
You don't tend to see burst discs on steel tanks? I suspect this is because being steel they hold there mechanical strength up to a much higher temperatiure, so are less likely to fail in a fire, which is really the main case for a burst disc activating? (most modern valves use a plastic tank valve seat, so in a fire this actually melts and acts to release the air pressure in a controlled way)
All tank valves should have a burst disk, steel or aluminum, does not matter its the safety aspect to prevent a tank bursting. Thanks for watching Max.
My cylinders have a hydro test pressure 50% above the working pressure, so the burst pressure is some way above that. My regular ones are tested at 350 and the 300Bar cylinder at 450 so I'd guess the burst pressures are North of 400/500Bar. Also, living in the UK and having EU spec kit, none of my cylinder valves have burst discs; I guess the Eurocrats decided no-one would try or even be able to fill a tank to over 5800 psi, let alone 7000!
I have not dived European waters but all the tank valves I have seen in my travels have a burst disk, yoke and DIN. It maybe a specific country regulation but having filled thousands of tanks, It is possible to overfill to 400+ easily if not watching the gauges. Thanks for watching Tim.
Yokes can't handle more than 3500 psi, so going any higher requires threaded DIN connectors. If you offer a tank for sale with a pressure of >3442 psi, you can't sell it with a yoke valve, which would greatly limit the market for it. Here in Europe, DIN connectors and 300 bar (4500 psi) tanks are much more common than in North America.
@@jacquespoirier9071 cave fills have been the standard in cave country for 40 years. It's been ok so far. Besides, if I fail a hydro after 20+ years of good service, yet got a puss ton more gas for dives for 20+ years I call that a win.
Not having dived in Europe, I can't say but in North America and the warm water dive travel I did, always had tank valves with burst disks in them. Like to know if your country has them.
@@AlecPeirceScuba_SeaHunter The fear is that the disk will burst. At 300 feet that could be very bad. Replacing the disk often is probably better idea.
Working in a shop I've seen burst disks on occasion, it's an attention getter. One thing I've seen that you didn't mention is that occasionally when they age they develop a miniscule pin hole at pressure.
This results in you filling a tank to 3000 psi and putting it in the rental rack. 2 weeks later you test it before it goes out and it's at 2200 psi. What's happening, and you need to find it is fill the tank to pressure and submerge it is a tiny stream of fine bubbles from the disk. At some point the pressure drops enough for that the hole reseals and stay stable at that lower pressure. Can be a bit frustrating to trouble shoot. (Trust me on that)
As always, top notch content from you.
Didn't want to cover disk leaks as that may be a follow-up video if this is well received. I serviced thousands of tank valves but never came across a leaking disk. Thanks for sharing Steve.
I think this has happened to mine.
Thank you for for posting this information.
It fell on good ground. Thank you.
The most charismatic scuba guy EVER. Your voice is honey, pouring down our ears!
Thank you for that Verrux.
The OG SCUBA master. Always enjoy your videos.
Legend!
Very informative and never dry, as always. But there's something v e r y special about this vid.
FINALLY we see Kevin, may be not in detail, but at least enough to prove he exists!
How long have we been waiting for this. Look at the blue shiny surface of that compressor or what it is, starting at 08:53!
Hooray Kevin!! You're not forgotten!!
SO I asked Kevin since he's the expert behind the camera. He said it's not him but a customer watching us. Kevin is like Bigfoot, everyone knows he exists but has never seen or filmed him. Keep watching Markus you may get him one day.
Once again, very informative. I love your Tech Tip videos… I’ve learned so much from them!
Thanks for watching Seven.
Thanks!, I read about it on the PADI Manual for Recreational Diving and could not imagine what it looked like and every other feature it has. Great zooms haha!
Glad it was helpful and Kevin got the zoom right.
A
I always learn something new from you Alec. Cheers!
Thanks Ed.
Went on a dive in Lake Jocassee SC yesterday, water temp 80 F spent 65 mins @ 25 feet or so; beautiful dive. The summer is ending too quick. I need to progress to dry-suit diving.
Love the chan; something relaxing about a scuba instructor giving a lesson. Thanks Alex
Your very welcome Gramit.
@@AlecPeirceScuba_SeaHunter sorry for misspelling your name it was voice to text
Thanks Alec and Kevin. Always something interesting on your videos.
Thanks Rick. Appreciate your support.
And I thought a burst disc is what I get for not using good body mechanics when lifting all my heavy gear! Good video, sir!
Almost burst my own disk lifting a twin 72 rig once. Dive smart not cool!
I am going to do my advanced open water course this weekend, just been learning about H valves. Thanks for great videos and useful informations !
Search for and watch my video on the "Vintage Scuba" playlist were I explain where the K and H valve reference actually come from. Hint, its a part number.
I am amazed to always learn something .
Me too!
Awesome, such great Information, thank you!!!!
Glad you picked up something useful.
That’s great to know about that desk. Thanks
Welcome Will.
Great info
Thanks DC.
I knew you had to have a burst disc video! I heard recently that some cave divers love to install higher burst discs on their steel LP’s to get super high pressures. Obviously not recommended but interesting all the same.
Funny has scuba tries to be safe in every way but some bypass safety for other purposes.
Great video 👍🏽, that’s my dive shop I go too. Friendly people there
Loved shooting at Aquarius, have to go back and do another series soon.
@@AlecPeirceScuba_SeaHunter I was actually there today picking up some goodies for my dive on Sunday 👍🏽 love your content
Hey Alec, Miguel from the Conch republic. Wanted to point out, that tanks should be stored either full or empty, since in case of fire, like I saw in Rotan, they had a boat fire, full of scuba tanks half full, and they blew up, since they were not full enough to burst the disk, or empty enough, to not cause an explosion.
That was a one off event. No one plans to store a tank empty, its just left after the last dive. The tank your thinking of is at CoCo View resort as Kevin said its there in the dining room.
the burst disc is a major safety feature in the case the tank is caught in a fire, this will avoid a destructive explosion .
It is a safety feature that protect from a destructive explosion in the case an overfilled tank left in an overheated automobile trunk.
If you figure that a the tank contains the energy of a powerful compressor running for as much as 1/2 hour to fill one tank, you can imagine the energy accumulated. When this energy is sudently released ( say 1/100 second) you can imagine the power of the blast and the shock wave that is sufficiently powerful to blast you in a packet of miced meat .
Don't mess with safety items like burst disks. They are to safe you from doing something silly.
Thank you
Glad you enjoyed it.
I am currently finishing cave training in North Florida. In getting all of my own gear straight, my instructor has asked that I place 5000 psi rated burst disk into two Faber LP Steel 85s. They have been filling these tanks to around 3600 psi each (on average). Do you know why they have us use low pressure tanks for this? Is it a weight thing? And since I have to install these disk replacements myself (my local shop refuses to do it), do I need to add any type of lubrication before installing?
First, congratulations on taking cave training. It's a fun and demanding sport with no room for errors. Fabers LP's are rated 2400+10% (2,640), PSI fill pressure in North America. Why overfilling to 3600 is not something I can relate to but tech divers may. Suggest posting your question on www.scubaboard.com for expert tech divers input. May assure you all is OK or not but you decide what is right.
A
Hello, quick question!
Is it legally acceptable to have a cylinder valve without a burst disc?
I have seen brand new aluminum cylinders with a new valve that doesn't seem to have a burst disc, and I am wondering if that is safe
All scuba tanks must have a burst disk of some sort. If you saw a new tank and valve it will have it but may be recessed and not as visible as older models. When it doubt, ask the tank owner to confirm it.
A
I had a burst disk blow right next to me once. My ears were ringing for the next 3 hours and the valve was completely frozen.
It was especially nice for making my drink cold.
Still scared me to death though!
Lol I did something similar taking apart a paintball reg that still had some pressure in it lll
That must have cause a SSCE (Sudden Sphincter Closing Event).
@@AlecPeirceScuba_SeaHunter it definitely did! 🤣🤣
Hello, I have a question please get back to me,I have a kenko delphinus ce-05 underwater housing for camera full set up, with lights and all made and from japan do you know how much it would be all worth?
No idea, too many variable I don't know. Best to Google it or ask other divers on www.scubaboard.com for their feedback.
You don't tend to see burst discs on steel tanks? I suspect this is because being steel they hold there mechanical strength up to a much higher temperatiure, so are less likely to fail in a fire, which is really the main case for a burst disc activating? (most modern valves use a plastic tank valve seat, so in a fire this actually melts and acts to release the air pressure in a controlled way)
All tank valves should have a burst disk, steel or aluminum, does not matter its the safety aspect to prevent a tank bursting. Thanks for watching Max.
I always expected the burst disk to be big like a coin, I didn't think it would be that small!
The smaller that are the safer the disk because they are thin metal.
My cylinders have a hydro test pressure 50% above the working pressure, so the burst pressure is some way above that. My regular ones are tested at 350 and the 300Bar cylinder at 450 so I'd guess the burst pressures are North of 400/500Bar. Also, living in the UK and having EU spec kit, none of my cylinder valves have burst discs; I guess the Eurocrats decided no-one would try or even be able to fill a tank to over 5800 psi, let alone 7000!
I have not dived European waters but all the tank valves I have seen in my travels have a burst disk, yoke and DIN. It maybe a specific country regulation but having filled thousands of tanks, It is possible to overfill to 400+ easily if not watching the gauges. Thanks for watching Tim.
@@AlecPeirceScuba_SeaHunter I've certainly seen them in the Caribbean/US, but not in UK. Useful to know how they work though.
@@AlecPeirceScuba_SeaHunter As far as I know we don't have them in the Netherlands either. None of my 6 tanks have them
You want the tank to explode??!!! Ok, hold my beer!! xD
Yup, some think that way.
If a HP steel tank has a working pressure of 3414 PSI, but can take oh, 7500 PSI why are we limited to 3414 instead of say 5000?
Whats your first stage rated for?
In cave country LP steel stanks are regularly filled to 3800
Yokes can't handle more than 3500 psi, so going any higher requires threaded DIN connectors. If you offer a tank for sale with a pressure of >3442 psi, you can't sell it with a yoke valve, which would greatly limit the market for it. Here in Europe, DIN connectors and 300 bar (4500 psi) tanks are much more common than in North America.
@@KB-gd6fc the direct consequence is a greatly shortened fatigue life of the tank material and you,re more likely to encounter a failed hydrotest.
@@jacquespoirier9071 cave fills have been the standard in cave country for 40 years. It's been ok so far. Besides, if I fail a hydro after 20+ years of good service, yet got a puss ton more gas for dives for 20+ years I call that a win.
I don't believe we have burst discs in Europe, know how broad the usage is?
Not having dived in Europe, I can't say but in North America and the warm water dive travel I did, always had tank valves with burst disks in them. Like to know if your country has them.
Alec, I have to say the title of the video made me sweat thinking someone blew their back out.
The older you get the greater the possibility you can burst a spine disk. Be careful and let the young kids pick up the tanks!
A lot of tech divers get rid of it. I didn’t know you were supposed to replace them.
Ask them if the toss out the spare tire in their car too. Its one for safety so not really needed, right?
@@AlecPeirceScuba_SeaHunter The fear is that the disk will burst. At 300 feet that could be very bad. Replacing the disk often is probably better idea.