LIQUEFIED HYDROGEN TANK AND TANK INTERNAL PRESSURE CONTROL METHOD THEREFOR

To restrain cavitation from occurring in a pump while reducing construction costs of a liquefied hydrogen tank.SOLUTION: A liquefied hydrogen tank 1 comprises a tank body 2, a pump 3 for delivering liquefied hydrogen LH in the tank body 2 to the outside, a liquid level detection part (26) for detecting the liquid level of the liquefied hydrogen LH in the tank body 2, and pressure increasing parts (4 and 5) for increasing a tank internal pressure that is the pressure of a gas phase part B in the tank body 2, in accordance with a decrease in the liquid level detected by the liquid level detection part (26).SELECTED DRAWING: Figure 1 【課題】液化水素タンクの工事費用を抑えながら、ポンプでのキャビテーションの発生を抑止する。【解決手段】液化水素タンク１は、タンク本体２と、タンク本体２内の液化水素ＬＨを外部に払い出すポンプ３と、タンク本体２内の液化水素ＬＨの液位を検出する液位検出部（２６）と、タンク本体２内の気相部Ｂの圧力であるタンク内圧を、液位検出部（２６）による検出液位の低下に応じて上昇させる昇圧部（４，５）とを備える。【選択図】図１