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Closed Drains Pressure Vessel be sized to accept drained fluids from the largest pressure vessel?

asked Jul 13, 2014 in Mechanical by lilianlope (2,330 points)
Should the Closed Drains Pressure Vessel be sized to accept drained fluids from the largest pressure vessel on the facility, plus an allowance for any liquids continuously routed to the drains system?

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answered Jul 13, 2014 by pasmith (3,320 points)
It is not typical to include a closed drain vessel sized to accept drained fluids from the largest vessel at low low level trip setting.  The required closed drain vessel to accept fluids from the treaters (dehydrator and desalter) which are liquid full and have high volumes of fluids even at low low level trip settings.

It is based on accommodating the fluids from the largest vessel at low low level trip setting that is connected to the closed drain system, excluding the treaters.
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