1. Users apply to the company and inform the village community and contact telephone number. 2. Arrange personnel to inspect the site and point out the direction of trench excavation. 3. Farmers dig ditches by themselves. 70 centimeters deep. 4. The staff will check the site again, mainly to check the excavation depth of the pipe trench, and then arrange the installation time after it is qualified. 5, after the installation, pressure test. 6, the pressure is normal, well ventilated. 7. Explain the knowledge of safe gas use.