![]() There is an interim time period between the liquid-expansion and the boiling-vapour relief during which it is necessary to relieve the mixtures of both phases simultaneously, either as flashing, bubble, slug, froth or mist flow until sufficient vapour space is available inside the vessel for phase separation. ![]() However, this rate is valid for a very limited time, after which vapour generation becomes the determining contributor in the sizing of the pressure-relief device. The hydraulic-expansion equations given in 5.14.3 may be used to calculate the initial liquid relieving rate in a liquid-filled system when the liquid is still below its boiling point. I read API 521 section 5.15.3.3, where it states Assuming the same mass flow rate as the vapor relief, due to high liquid density the liquid relief rate is significantly higher than vapor relief. Do I need to calculate the relief load assuming it full liquid relief. The relief load calculated is for vapor relief. After calculating the wetted surface area and came up with a relief load based on Q=21000*F*A^0.82 I am working on sizing psv for fire cases.
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