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Thread: Sizing of relief valve for LPG bullet

  1. #1

    Join Date
    Jan 2013
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    Sizing of relief valve for LPG bullet

    Dear all,
    Please help me. I have an issue with basics.

    Problem follows:
    Make a spreadsheet for the sizing of relief valve for commercial LPG bullet (mainly propane) using API 520. Temperature of atmosphere where the bullet is kept (above ground) varies from 10°C to 35°C (50°F to 95°F).
    Which procedure in API 520 should I use?
    >procedure for liquid OR
    >the procedure for vapor-liquid?

    As u know, in API 520, different procedures are given for - critical, sub-critical flow, liquid relief, sizing for two phase liquid or vapor etc. So I am confused:-(
    The LPG bullet would be filled 85% of their water capacity, the remaining space being taken up with vapor (as I read from some websites).

    (I already made the spreadsheet for various conditions given in API 520. But I need to choose which procedure to use specifically for LPG bullet )

    If I haven't given enough info to solve the problem, please let me know.

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  3. #2

    Join Date
    Feb 2009
    Thanked 16 Times in 5 Posts

    Re: Sizing of relief valve for LPG bullet

    This depends on the overpressure scenario's you have identified and quantified, for fire you would use the vapour sizing equations but for overfilling you would use the 2-phase equations.

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    chen4 (11-25-2013)

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  6. #3

    Join Date
    Feb 2009
    Thanked 40 Times in 26 Posts

    Re: Sizing of relief valve for LPG bullet

    So, was this part of your job/work or you're doing it for school or for fun?

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