Gas Pipeline Installation Steps

Prior to laying gas pipelines, the pipeline‑laying foundation must be properly prepared to ensure its stability and prevent damage caused by foundation settlement.

　　Foundation Treatment

　　Prior to laying gas pipelines, the pipeline‑laying foundation must be properly prepared to ensure its stability and prevent damage caused by foundation settlement.

　　Pipeline installation

　　• Trenching for pipelines: Perform trenching operations in accordance with design specifications, ensuring that trench depth and width comply with relevant code requirements.

　　• Pipeline installation:

　　① Steel pipes: First, connect the pipes and secure them using either welded or flanged joints. During welding, ensure high-quality welds by employing professional welding procedures.

　　② Polyethylene pipes: Use hot-melt or electrofusion connections to ensure the watertightness of the joints.

　　• Pipeline Protection: Protect installed pipelines to prevent damage from external forces during construction.

　　Pipeline connection

　　The main methods of pipe connection are as follows:

　　• Welding: Suitable for steel pipes; during welding, attention should be paid to factors such as temperature and atmosphere to ensure weld quality.

　　• Flanged connection: A flange-and-bolt assembly, suitable for applications requiring frequent disassembly.

　　• Hot-melt connection: Suitable for polyethylene pipes; during connection, the heating temperature and duration must be carefully controlled to ensure joint quality.

　　Pipeline testing

　　After pipeline installation is complete, a pressure test must be conducted to ensure the pipeline’s tightness and structural integrity.

　　• Air-tightness test: Apply a specified pressure to detect leaks in the piping and ensure safety.

　　• Pressure Testing: Conduct pressure testing on the pipeline to verify its ability to withstand the design pressure.