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Question dive bottle markings?

Discussion in 'Anything Airgun Related' started by nick2303, Feb 8, 2014.

  1. nick2303

    nick2303 Engaging Member

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  2. Tadpole

    Tadpole Super Moderator Staff Member Mod/Admin

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    imo no ................. :coffee:
     
  3. nick2303

    nick2303 Engaging Member

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    its just that i have seen quite a few advertised like this..

    i think its because a 232bar wp (working pressure) is tested to 300 bar and 300 bar is also stamped on the cylinders as the test pressure..

    just for anyone whose looking for a cylinder, as i am, make sure they are 300bar wp...
     
  4. Tubs

    Tubs Active Member

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    It is indead a 232 bar tank the WP232 stands for 'working pressure' 232 bar, also you only get international Din fitting valves for 300 bar and that has a aclamp valve in the picture
     
  5. DenTB

    DenTB Donator

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    A clamp

    The a clamp on the cylinder is the pressure fill reading valve which is used after the bottle has been filled normally to 200 220 bar, thats a normal dive fill. Because thats what scuba is rated for. Test pressure on normal steel bottles is indeed normally 300 bar,


     
  6. Clubshot

    Clubshot Clubshot

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    Midland Diving Equipment Web site covers this issue

    They are a major importer -

    Might be tested up to 300 Bar - but will not hold 300 Bar

    300 Bar has normally got a 410 Working Preasure

    Difference in bottles is metal thickness and more threades -

    BOB/R
     
  7. DenTB

    DenTB Donator

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    Spot on matey, more geared towards Tech Divers twinsets,with more run time at depth and Or,using a rule of thirds as a fudge factor. Or if you dive youll understand the Heavy breather on your ass!!
     
  8. landymick

    landymick Keyboard Hero

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    Some good info there,on new bottles should it come with any paperwork about test date ecetra only i've had 4 bottles 3 new & never had no documents.Also is there a manufactured date separate to test date or is it same from new?
     
  9. Ruddles

    Ruddles Engaging Member

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    WP stands for working pressure and is the maximum that a dive shop will fill the bottle to. When the bottle undergoes a full hydrostatic test, they pump it (with water, I believe) up to 50% over the WP and measure any deflection in the size of the metal: if it's too great, the bottle fails the test. A bottle with a WP of 232bar will be stamped "TP348BAR".
     
  10. Ruddles

    Ruddles Engaging Member

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    There's a typo here somewhere. I've never heard of a scuba tank with a WP in excess of 300bar.

    (My quals: PADI AI, TDI Adv Nitrox, BSAC Dive Leader.)
     
  11. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Agree, that's a 232bar cylinder that's been mis-listed.


    Yup; my assumption was a working pressure of 300bar / test pressure of 450bar..
     

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