Gas fuel supply piping system

摘要

The leakage inspection for a compressed natural gas (CNG) supply piping system where a filling passage 4 and a supplying passage 5 are provided in a valve body 3 which serves as a block of a CNG fuel container. The filling passage 4 and the supplying passage are provided with a manual stop valves 13 and 7. A solenoid valve 8 is disposed at an open end of the supplying passage 8. A CNG filling inlet 10 is provided at an outer end of a filling conduit 9 communicated to the filling passage 4. A conduit 12 extending to an engine is provided with an inspection gas inlet 14. For the leakage inspection, the stop valves 7 and 13 are closed and an inspection gas is introduced from a leakage inspection gas inlet 14 and the filling inlet 10. It is examined by measuring a pressure change in the conduits 9 and 12 whether or not a leakage occurs.