| 摘要 |
PROBLEM TO BE SOLVED: To detect surely and easily gas leak from a connection part between a gas cylinder and a gas pipe. SOLUTION: This connecting mechanism 40, which is a mechanism connecting a gas pipe 26 to a gas outlet nozzle 16 of a particular high pressure gas cylinder 10, comprises a nitrogen gas flow path 42 as a supply means of nitrogen gas and a pressure detection means, distribution ring 44 distributing nitrogen gas to the nitrogen gas flow path 42, nitrogen gas pipe 46 supplying nitrogen gas to the distribution ring 44, and a pressure gage 48 measuring a nitrogen gas pressure in the nitrogen gas pipe to output a pressure measured value. The nitrogen gas flow path 42 is four flow paths arranged with a 90 deg. space in a peripheral direction of a gap pipe to be inserted in a lengthwise direction in a pipe wall. A collar washer has a protruded part having an opening communicating with the gas pipe 26 in the center, inner side annular surface between the protruded part and an annular groove, and an outer side annular surface extended outward from the annular groove to be made lower than the inner side annular surface by a height difference (H) of 0.05 mm, the inner side annular surface functions as a packing touch surface. A gas outlet of the nitrogen gas flow path 42 is provided in the annular groove.
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