| 摘要 |
A storage tank for cryogenic liquids incorporates an ullage vessel that provides for an ullage space. The ullage vessel is in communication through an ullage line to a fill line that provides cryogen to a cryogen space. The junction where the ullage line and fill line meet is of a certain cross-sectional area. Downstream of the junction, the fill line is of a greater cross-sectional area than at the junction. This creates a pressure reduction at the junction during filling, which causes a net flow of material from the ullage space over the course of filling. Once the tank is liquid full, causing cryogen to be redirected down the ullage line, the smaller cross-sectional area of the ullage line compared to the fill line causes a reduction in flow of cryogen which is detected by the fill pump causing filling to stop.
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