PRESSURE VESSEL, METHOD AND DEVICE FOR PROVIDING INTERNAL PRESSURE INTO PRESSURE VESSEL, METHOD FOR SUPPLYING PRESSURE VESSEL, AND METHOD FOR PROVIDING SERVICE THEREAFTER

摘要

PROBLEM TO BE SOLVED: To provide a means for providing a proper internal pressure into a pressure vessel. SOLUTION: Air bubble-containing particles having independent air bubbles kept at a higher pressure than the atmospheric pressure air filled into the inside of the pressure vessel to adjust an internal pressure of the pressure vessel.