PURPOSE:To enable the use of a tank truck for liquefied natural gas used for normal work in ordinary times as a truck for the supply of emergency gas in the case of emergency by attaching an emergency gas supplying port to an evaporated gas supply line connecting a vaporizer and an engine of the truck. CONSTITUTION:In the case of necessitating emergency gas, an emergency gas supplying port 9 is connected to an emergency gas receptor 12, a shut-off valve 13 is closed, an emergency gas supplying valve 10 is opened and, as necessary, the vaporization capability of a vaporizer 5 is increased and the operation of an engine 3 is continued. A part of gas evaporated by the vaporizer 5 is transferred through an evaporated gas supplying line 7 to an engine and used as a fuel for the engine 3. The remaining part of the gas is introduced through a supplying port 9 and a receiving port 12 to a city gas pipe 11 and supplied to gas utensils and apparatuses.
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