| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas pressure monitoring device enabling to relax traffic control and reduce construction cost by reducing a gas pipe construction region on a road, and to provide a gas grid constructing method. SOLUTION: The gas pressure monitoring device 10 includes a bypass pipe 21 connected at both ends to a pair of gas pipe terminal portions 47, 47 on both sides of a shut-off part 46 of a gas grid 50. A normally-closed manual valve 24 and a motor driven valve 25 are arranged in parallel to each other on the midway of the bypass pipe 21. A pair of pressure sensors 27, 27 detect gas pressure in the pair of gas pipe terminal portions 47, 47. When the gas pressure in one of them is lower than a predetermined reference value, the motor driven valve 25 is opened to open the bypass pipe 21. COPYRIGHT: (C)2010,JPO&INPIT
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