Problem to be solved: to supply a city gas to a demand destination according to a demand in a city gas production system equipped with a plurality of city gas manufacturing apparatuses, and to make a city gas manufactured by suppressing the fluctuation of the heat quantity even when the operation of the switching of a city gas manufacturing apparatus is carried out, even if the operation is switched Problem to be solved: to provide a switching method of a city gas manufacturing apparatus capable of supplying to a demand destination in a stable state and a city gas production system.The switching method of the city gas manufacturing apparatus 10 isFrom the second city gas production device 12 for small flow rate to the first city gas production equipment 11 for large flow rate, the device is switchedThe first shut-off valve 31 is opened.The second shut-off valve 32 is closed.Before switching the supply path of liquefied petroleum gasBy opening the pre injection valveThrough liquefied petroleum gas branchLiquefied petroleum gasIt is distributed to the first city gas manufacturing equipment 11 which continues to supply natural gas.The first city gas producing apparatus 11 mixes with natural gas.Diagram
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