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    #1

    cracking ..... that it is in proper working condition

    Hello all forum users!

    WARNING! As per SOLAS-requirements, check-lifting must be carried out before loading, discharging and ballasting is commenced. If the valve disc does not move freely, the cause should be determined and corrected immediately. If a lever is used, cracking the valve open would not be adequate evidence that it is in proper working condition. It is likely clogged.

    In my opinion, the underlined fragment in bold type means the following:

    If a lever is used, opening the valve (by force) would not provide adequate evidence that the valve is in proper working condition.


    The fragment is taken from operating/maintenance instructions for HS-ISO pressure valve.

    I am particularly interested in the meaning "to crack something open. I think it means "to open something by force" and is similar in meaning to "to break something open". I may be wrong.

  1. MikeNewYork's Avatar
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    #2

    Re: cracking ..... that it is in proper working condition

    Yes, it would mean opening the valve by force.

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    #3

    Re: cracking ..... that it is in proper working condition

    Quote Originally Posted by JACEK1 View Post
    Hello all forum users!

    WARNING! As per SOLAS-requirements, check-lifting must be carried out before loading, discharging and ballasting is commenced. If the valve disc does not move freely, the cause should be determined and corrected immediately. If a lever is used, cracking the valve open would not be adequate evidence that it is in proper working condition. It is likely clogged.

    In my opinion, the underlined fragment in bold type means the following:

    If a lever is used, opening the valve (by force) would not provide adequate evidence that the valve is in proper working condition.


    The fragment is taken from operating/maintenance instructions for HS-ISO pressure valve.

    I am particularly interested in the meaning "to crack something open. I think it means "to open something by force" and is similar in meaning to "to break something open". I may be wrong.
    To "crack open" doesn't imply force. It usually means just to open something. "Let's go to the beach and crack open a couple of beers", merely means that we will open a couple of beers. The bit about using a lever confuses the issue as using a lever implies that more force is needed than another method - which is not disclosed in the text.

  2. MikeNewYork's Avatar
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    #4

    Re: cracking ..... that it is in proper working condition

    It requires force to "'crack open" a beer. And then there is crack open a safe, a coconut, etc. In addition, the lever also implies force.

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    #5

    Re: cracking ..... that it is in proper working condition

    While certainly not familiar with the operation, in the context provided I would agree with your interpretation.

  3. 5jj's Avatar
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    #6

    Re: cracking ..... that it is in proper working condition

    Quote Originally Posted by MikeNewYork View Post
    It requires force to "'crack open" a beer.
    I don't think many people would associate cracking open a beer with force.

  4. emsr2d2's Avatar
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    #7

    Re: cracking ..... that it is in proper working condition

    I don't associate force with opening beer cans either. If you crack open the door, you open the door a crack.
    I assumed that "cracking the valve open" meant only opening it a tiny bit.
    Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.

  5. Route21's Avatar
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    #8

    Re: cracking ..... that it is in proper working condition

    Quote Originally Posted by emsr2d2 View Post
    I don't associate force with opening beer cans either. If you crack open the door, you open the door a crack.
    I assumed that "cracking the valve open" meant only opening it a tiny bit.
    Spot on!

    As a retired NES chemical engineer (oil, gas and petrochemical industries), but not a teacher:

    Cracking a valve open very specifically means opening it a small amount. It does not, per se, imply any significant force is used.

    Almost all 1/4-turn on/off valves (e.g. ball/plug valves) have a lever, which is, traditionally in line with the pipe when open and at right angles to it when closed. Those that don't have a physical lever would likely have an actuator to perform the same duty.

    Regards
    R21
    Last edited by Route21; 18-May-2013 at 12:38. Reason: added "per se".

  6. Route21's Avatar
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    #9

    Re: cracking ..... that it is in proper working condition

    Quote Originally Posted by emsr2d2 View Post
    I don't associate force with opening beer cans either. If you crack open the door, you open the door a crack.
    I assumed that "cracking the valve open" meant only opening it a tiny bit.
    Rising stem valves, such as "gate valves", are, by their nature, hand-wheel rather than lever-operated. They are opened either by hand-wheel, chainwheel or a "wheel-key". They are more likely to get stuck in the closed position, if fouled, which is where the wheel-key comes in handy to provide additional leverage beyond the radius of the hand-wheel.

    Regards
    R21

    PS SOLAS stands for Safety of life at sea. In situations where timing is critical, I would expect to see primarily ball valves used as they are quick to operate.
    Last edited by Route21; 18-May-2013 at 12:54.

  7. Route21's Avatar
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    #10

    Re: cracking ..... that it is in proper working condition

    The OP mentions "pressure valve" and "disc".

    If, by that, the OP actually means a "Pressure Relief Valve" (PRV), that might explain the reference to a "disc".

    What the O&M manual could be saying is that, just because you can actually "lift" (move) the spring-loaded disc, it doesn't mean that the PRV will be able to open sufficiently to relieve any overpressure. Without details of the system from the OP, it's not possible to see where any overpressure or fouling would come from.

    The thing that I find confusing from the OP was that I would not expect to see an unprotected, fouled relief valve, particularly in a SOLAS situation, where lives are at risk. I would expect the inlet of the relief valve to be protected by a carbon or metal "rupture/bursting disc", with a pressure gauge between the disc and the PRV, to identify if the disc had blown. If it has, the PRV should be removed, cleaned and "popped", to ensure it opens and closes at the correct pressures.

    Regards
    R21

    PS The OP should be able to understand the technicalities in these posts.

    See:
    http://en.m.wikipedia.org/wiki/Pressure_relief_valve
    Last edited by Route21; 18-May-2013 at 14:22. Reason: added wiki reference to relief valves and comments on bursting discs.

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