Welcome to ScubaBoard, an online scuba diving forum community where you can join over 205,000 divers diving from around the world. If the topic is related to scuba diving, this is the place to find divers talking about it. To gain full access to ScubaBoard (and make this large box go away) you must register for a free account. As a registered member you will be able to:

  • Participate in over 500 dive topic forums and browse from over 5,500,000 posts.
  • Communicate privately with other divers from around the world.
  • Post your own photos or view from well over 100,000 user submitted images.
  • Gain access to our free classifieds marketplace to buy, sell and trade gear, travel and services.
  • Use the calendar to organize your events and enroll in other members' events.
  • Find a dive buddy or communicate directly with scuba equipment manufacturers.

All this and much more is available to you absolutely free when you register for an account, so sign up today!

NEW for 2014 Access SBlogbook for members. It allows you to directly upload data from your dive computer, validate your logs digitally, link your dives to photos, videos, dive centers (9,000 on file), fishes (14,000 on file) and much more.

If you have any problems with the registration process or your account login, please contact the ScubaBoard Support Team.
Page 2 of 9 FirstFirst 1234567 ... LastLast
Results 11 to 20 of 88
Like Tree70Likes

Thread: 20 year shelf life for Aluminum dive cylinders


  1. #11

    Finally reached 25 dives and
    it only took 2 years...

    fjpatrum's Avatar
    Join Date
    May 2010
    DC area
    25 - 49
    Quote Originally Posted by Jim Lapenta View Post
    He is not telling you the truth at all. There are lots of stories about shops pulling this kind of crap to try and sell you something else. I seriously hope you inform him of your findings and then inform him that you will be posting the name of his operation here and on your facebook page if you have one. May save someone else from being screwed over. Shops like this do not deserve to make it. They should be shut down.

    Sent from my DROID X2 using Tapatalk
    While I agree that shops knowingly doing this deserve to be shut down, if the guy is genuinely misinformed it might be best to just inform him properly before tarnishing him with a bad brush.

    OP, let the guy know you found his information to be inaccurate first and then decide whether he was being dishonest or just misinformed.
    Never judge a day by the weather. The best things in life aren't things. He who dies with the most toys still dies. There are 2 ways to be rich - make more or desire less. No rain, no rainbows. Take it easy.
    -Hawaiian rules to live by

  2. #12
    Tech Instructor

    Somewhere hanging at 20'

    Teller's Avatar
    Join Date
    Dec 2009
    Sarasota, Florida, United States
    I'm a Fish!
    That is a false statement and I dont agree with this but his compressor his rules. Find a new shop.
    Culcuhain likes this.
    Brent Teller
    Technical Scuba Diving Instructor


  3. #13
    ScubaBoard Supporter

    Go Red - Support SB!

    Trying to stay out of trouble

    DandyDon's Avatar
    Join Date
    Jul 2003
    One kilometer high on the Texas High Plains
    200 - 499
    Mistakes and misunderstandings happen. I once received a message from a shop I still generally trust that my 5 year old pony needed extra testing at hydo - eddy current test I think it was, but there was a mistake in info transfer along the way. It didn't. It was made in 2001, now up for another hydro, and I am taking it to the facility myself - then to the shop for viz.

    Tanks produced prior to 1990 are subject to more scrutiny. Some of those do require the eddy current test, but determining which often require the dealer to check further as it's not an every day thing. Some stations will not fill them at all.
    beaverdivers likes this.
    You can test the tanks you breathe or - dive on hope.
    Testing is safer...

    Great news for vacation divers who cannot talk themselves into buying a personal CO tank tester!

    >> Rent one for a week or longer here <<

    Yeah it's just the air we breath - at depth!

  4. #14

    has no status, but we
    knew that already.

    Bob DBF's Avatar
    Join Date
    Oct 2009
    Sonoma County, CA
    I just don't log dives
    Quote Originally Posted by DandyDon View Post
    Tanks produced prior to 1990 are subject to more scrutiny. Some of those do require the eddy current test, but determining which often require the dealer to check further as it's not an every day thing. Some stations will not fill them at all.
    The 6351-T6 AL and some other alloys of AL tanks were found to have problems on many tanks prior to 1990, because of the problem of that alloy the tanks have an eddy current test as well as a hydro and viz. By 2010 it was getting harder for a dive shop to sort this out so a lot of them decided to make a cutoff of 20 years to make it easier on their staff than actually finding out which tank needed what. A mistake might end in an explosive failure so I understand their thinking.

    Anyone not knowing why this was instituted in 2010 might think 20 years is the rule.

    I may be old, but I’m not dead yet.

  5. #15

    is an entanglement hazard

    DaleC's Avatar
    Join Date
    Jul 2008
    Leftcoast of Canada
    500 - 999
    The problem with basing decisions on easy instead of fact is that it allows the mind to stop paying attention to reality. I've had a shop refuse to fill my 20 year old steel tank and another give me 3000psi fills in my 2250 rated tanks.

    If the OP wants more info they can go here and read a lot about aluminum tanks from the people who train people who work on them PSI-PCI - Home
    If no one reinvented the wheel we'd still be driving around on stone wheels.

    My personal website: http://www.manfish.ca/
    Fraser Valley Scuba Club: http://www.fvscuba.org/
    Cultus Lake Project:Cultus Lake Project

  6. #16

    Has not set a "status"

    Join Date
    Aug 2010
    Haines City, Florida
    0 - 24
    As others have said, find another shop. My shop had no issues doing visual/eddy current testing on my 2 1987 AL tanks a few months ago.

    I ran into another shop that was closing up a few weeks ago and asked him what his fill costs were and if he cared about thsoe tanks. He said he wouldn't touch them. Good luck with your closing, guy...

  7. #17
    Mental toss flycoon
    Go Red - Support SB!

    still looking for a clue

    NWGratefulDiver's Avatar
    Join Date
    Feb 2002
    2,500 - 4,999
    I think this is probably more a case of misinformation than disinformation ... ignorance rather than malfeasance, if you will. I have seen several references in scuba training materials and other texts that say the typical lifetime for an aluminum cylinder is 15-20 years. Now, ask yourself what does "typical" mean in this instance? Is it referring to rental cylinders that get heavily used and not particularly well cared for? Or would this be for cylinders that are privately owned and may go weeks or months between uses? Or would it be referring to cylinders that are used as deco bottles that may be getting chronically overfilled?

    Also, does it take into consideration the different types of aluminum alloys that tanks can be made from?

    There's a tendency among some dive professionals to read things like that and apply it indiscriminately, without really considering those questions ... and I suspect you just ran into one of those people. He may have been completely well-meaning, but just applying a rule of thumb in a way that doesn't take all those factors into consideration. There's a great deal of that happening in our industry, and it tends to take on a mythological life all its own.

    FWIW - one of the two AL80 cylinders I currently own was "born" in 1988, and just passed hydro last year ... meaning it's good until at least 2016. I expect that come that date, it will pass hydro once again.

    ... Bob (Grateful Diver)
    It was just below freezing and snow was falling steadily. As we stepped toward that portal separating a cold and dreary world from the tranquility and wonder of another dimension teeming with life and color a passer-by shook his head and muttered "crazy". Poor fool. If he only knew. (Airsix)

    Come visit me at http://www.nwgratefuldiver.com/

  8. #18

    self-aggrandizing fool

    Scared Silly's Avatar
    Join Date
    Apr 2006
    Up a river of excrement in a native american water vessel without any means of propulsion
    500 - 999
    To the OP, if you want to continue to use the shop you try to talk to the owner again about his information. For instance, when the rules regarding cylinders made from AL6251 were being formed it was proposed but NOT implement

    "a 40-year service life for cylinders manufactured
    of aluminum alloy 6351-T6 and used in SCUBA, SCBA, oxygen and carbon dioxide services."

    You can read a bit about it here:


    As for the 20 year lifetime - a specious argument that I have heard but found the origin. But I have seen several shops have such rules. Instead of trying to educate the owner I have noted the mfg of the cylinders being sold in their shop and called the mfg directly and told the sales reps that they need to educate their sellers as the dive shop is damaging their product reputation. NOt sure how affective my efforts have been as the shop was one I used while on vacation in Florida.
    4 out of 3 people have trouble with fractions

  9. #19
    The Lorax for the Kelp Forest

    Has not set a "status"

    drbill's Avatar
    Join Date
    Mar 2003
    Santa Catalina Island, CA
    2,500 - 4,999
    I have Al (and steel) tanks dating back to the 1970s. Haven't had a problem getting any of the Als VIPed or hydro'ed.
    Dr. Bill: I once had a 6-pack but now I have a full keg... well, maybe just a pony!
    Dr. Bill: Not THAT kind of doctor... but I'll take a look at it anyway!

    Kelp forest marine life images, DVD's for sale, and archived "Dive Dry with Dr. Bill" newspaper columns
    Single or Buddyless? Check out SingleDivers.com or PM me!

  10. #20

    Cleverly disguised as a

    Rich Keller's Avatar
    Join Date
    Feb 2011
    Long Island NY
    5,000 - ∞
    Quote Originally Posted by DandyDon View Post
    Look in the phone book for Fire Extinguishers, then call to ask about Hydroing a scuba tank. More work, less cost, straight scoop. You keep the valve and give them the tank.
    This site will help. Not all of these places deal with scuba tanks but the ones that do can hydro, VIP and fill your tanks. In my opinion the shop that told you that 20 years was the limit is either ignorant or trying to sell you new tanks. In either case I would find a new shop or bypass shops altogether. Buy your gear on line, get your instruction from an independent and have your tanks filled at one of these locations.

    PHMSA - Cylinders - Authorized DOT Cylinder Retesters: Domestic
    DandyDon likes this.
    LDS Tank Fill Rules http://www.scubaboard.com/forums/bas...ill-rules.html


    Learning is easy but understanding takes time.

Page 2 of 9 FirstFirst 1234567 ... LastLast

Similar Threads

  1. Life insurance for technical diving
    By Jake in forum Basic Scuba Discussions
    Replies: 19
    Last Post: November 5th, 2011, 09:59 PM
  2. Australia - need tips for the dive of my life
    By NirtakSretep in forum Introductions and Greets
    Replies: 4
    Last Post: February 22nd, 2010, 12:27 PM
  3. shelf life for air?
    By fookisan in forum Basic Scuba Discussions
    Replies: 0
    Last Post: June 4th, 2005, 07:48 PM
  4. Why use aluminum doubles for ocean diving???
    By JT2 in forum Technical Diving Specialties
    Replies: 70
    Last Post: February 25th, 2003, 02:32 PM
  5. PDA for Tech diving, and for life
    By Campana in forum Technical Diving Specialties
    Replies: 11
    Last Post: April 24th, 2002, 11:37 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts