Hello and welcome to our community! Is this your first visit?
Register
Results 1 to 9 of 9

Thread: Tank weights

  1. #1
    TDF Member
    Join Date
    Apr 2019
    Location
    Pontypridd
    Posts
    117
    Likes (Given)
    31
    Likes (Received)
    23

    Tank weights

    I have 2 tanks, both 15L both 232, both Faber!

    One weights 19.9 KG other weights 21.2Kg - Used decanting hose on them prior to weighing to balance air.

    I noticed last week the on my second dive my safety stop was all over the place, using the heavier tank.........

    Is this normal?

  2. #2
    TDF Member
    Join Date
    Apr 2019
    Location
    Pontypridd
    Posts
    117
    Likes (Given)
    31
    Likes (Received)
    23
    Rewighed, 21kg and 19.7 so 1.3kg diff

  3. #3
    Established TDF Member witchieblackcat's Avatar
    Join Date
    Dec 2012
    Location
    Penwortham
    Posts
    1,755
    Likes (Given)
    1708
    Likes (Received)
    518
    A cylinder's weight is usually stamped onto it near the neck with all the other information.
    Are the two weights different or the same when you look at the stamping?

  4. #4
    TDF Member
    Join Date
    Apr 2019
    Location
    Pontypridd
    Posts
    117
    Likes (Given)
    31
    Likes (Received)
    23
    Quote Originally Posted by witchieblackcat View Post
    A cylinder's weight is usually stamped onto it near the neck with all the other information.
    Are the two weights different or the same when you look at the stamping?
    The heavier on is marked 18kg, theres about 80 bar in it

    The lighter one i cant read the markings properly

  5. #5
    TDF Member
    Join Date
    Apr 2019
    Location
    Pontypridd
    Posts
    117
    Likes (Given)
    31
    Likes (Received)
    23
    Ok, 16.7kg and 18kg - guess I need to either adjust weight between dives......... Or get a diff tank!

  6. #6
    Established TDF Member
    Join Date
    Jan 2013
    Posts
    1,537
    Likes (Given)
    154
    Likes (Received)
    599
    In reality 1.3kg shouldn’t throw you off... but you could use a trim weight pocket on the lighter tank

  7. #7
    bottlefish Stuart Keasley's Avatar
    Join Date
    Dec 2012
    Location
    London (sometimes)
    Posts
    2,258
    Likes (Given)
    1389
    Likes (Received)
    1647
    Quote Originally Posted by Madocks View Post
    I noticed last week the on my second dive my safety stop was all over the place, using the heavier tank.........

    Is this normal?
    You're measuring dry weight (at the start of the dive?) , what really matters is the wet weight, ie the buoyancy characteristics of the tank at the end of the dive when it has less/minimal air/gas in it.

    But expand a bit, what do you mean by all over the place? And how much air/gas was left in the tank after the 2nd dive, how did that compare to the amount of air left in the other tank after the 1st dive?
    Please visit bottlefish for my personal web site, Quay Cameras to chat to me about the cameras and kit that I sell

  8. #8
    Sorry for being a dick jb2cool's Avatar
    Join Date
    Dec 2012
    Location
    Bracknell, Berkshire
    Posts
    1,481
    Likes (Given)
    88
    Likes (Received)
    394
    This may sound harsh but to me it sounds like you are looking for excuses. The buoyancy shift for a full to empty cylinder is already more than this 1.3kg difference you state.

  9. #9
    TDF Member
    Join Date
    Apr 2019
    Location
    Pontypridd
    Posts
    117
    Likes (Given)
    31
    Likes (Received)
    23
    Thanks, maybe im just over analysing diving

    Ill recheck buoyancy at end of dive on weekend


 

Posting Permissions

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