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Check that burst disk...

Discussion in 'Tanks, Valves and Bands' started by Fibonacci, Aug 27, 2018.

  1. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    623
    593
    93
    So I swapped out the damaged San-o-Sub valve on my recently purchased used Faber 15L tank (the one with the crimped-in DIN insert) and got it hydro tested without any further issues... tank was all good inside.

    However, I pulled down the original valve for overhaul and possible reuse as a yoke-only valve on my 'shop tank' and discovered the burst disk was heavily corroded in places.
    Who knows when it may have let go?!

    SoS_1.jpg
    SoS_2.jpg
    So from now on I will also replace the burst disk on every stem seal overhaul :wink:

    Kit DK-1 fits San-o-Sub and Thermo valves
     
    ladra, SleepySlipper and Akimbo like this.
  2. SleepySlipper

    SleepySlipper Divemaster

    # of Dives: 500 - 999
    Location: MN
    109
    89
    28
    @Fibonacci interesting. Do you know the year? Salt or fresh water?
     
  3. shurite7

    shurite7 Dive Shop

    # of Dives: 1,000 - 2,499
    Location: MT
    981
    408
    63
    The valve and burst disk are quite often neglected for servicing by many divers. In the U.S. CGA recommends the burst disc be replaced during hydro, in other words every five years. Most tank owners do not want to spend the money to replace the disc. They sure gripe, though, when it does go.
     
    SleepySlipper and Fibonacci like this.
  4. Fibonacci

    Fibonacci Manta Ray

    # of Dives: 500 - 999
    Location: Melbourne, Australia
    623
    593
    93
    Tank was manufactured by Faber in 2012, and San-o-Sub was the OEM valve used so it would be the same age.
    Only used in salt water, but originally from north Queensland.
    Obviously the valve area never got rinsed off, just left to dry in a humid sub-tropical coastal environment.
    Looking at the burst disk surface under a loupe shows all sorts of deep fissures where the copper has corroded away :eek:
     
    SleepySlipper likes this.
  5. SleepySlipper

    SleepySlipper Divemaster

    # of Dives: 500 - 999
    Location: MN
    109
    89
    28
    Good spot, thanks for sharing.
     
    Fibonacci likes this.

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