| 摘要 |
<p>PROBLEM TO BE SOLVED: To certainly close a nozzle to connect a valve of a low temperature tank. SOLUTION: A delivery nozzle 2 is sealed by lowering a liquid level below an opening part of the delivery nozzle 2 by delivering stored liquid in a storage tank 7, closing a main valve, removing a delivery pipe connected to the downstream side of this main valve, closing the delivery nozzle 2 inserting a bag body 14 as a primary seal in the delivery nozzle 2 by opening the main nozzle after installing an air lock chamber on an opening end of the main valve, thereafter removing the main valve from the delivery nozzle 2, providing a secondary seal to block the delivery nozzle 2 by extending its diameter on the delivery nozzle 2 on the downstream side of the first seal and installing a closing plate 41 on an installation flange of the main valve.</p> |
