METHOD FOR COLLECTING GRANULAR REFRIGERATING MATERIAL FOR MULTI-SHELL TANK

摘要

PURPOSE:To enable collecting refrigerating material without dispersing outside by taking out the granular refrigerating material charged between bulkheads from a tank by an absorption pump and collecting the refrigerating material taken out as a block type collected body. CONSTITUTION:A tip portion of an absorption pipe 16 is inserted between internal and external tubes from a manhole 5 to operate an absorption pump 6. As the pressure in a negative pressure chamber 11 becomes negative by operation of the absorption pump 6, refrigerating material 4 charged between the internal and external tubs is absorbed into a bag body 15 in the negative pressure chamber 11 through the absorption pipe 16 and collected as a block type collected body 7. Thus, the refrigerating material between the tubs can be collected sequentially into the bag body 15 without dispersing outside.