| 摘要 |
<p>A passive pressure control method and system for controlling pressure in the ullage vapor space (U) of a volatile liquid fuel underground storage tank (12) temporarily, during periods of increasing ullage vapor space pressure, allows vapor to flow into an auxiliary vapor space (46) of variable volume, defined at least is part by a resilient wall member (44), thereby to reduce the volume of vapor otherwise released to the environment.</p> |
