Pressure Testing in Urban Gas Pipeline Construction
Gas pipelines are vital lifelines in modern cities, ensuring safe and stable energy supply. To prevent leakage after installation, strict pressure testing must be carried out during construction. This is a key step to guarantee long-term safety.
What Is Pressure Testing?
Pressure testing involves injecting air or water into the pipeline, holding it at a specified pressure for a set period to check for leakage. Gas pipelines are usually tested at 0.6 MPa, with a holding time of at least 48 hours.
Testing Procedure
Pipe Welding
HDPE pipes are joined using butt fusion, forming strong and reliable joints.
Pipe Laying
Pipes are welded into long sections and sealed with end caps.
Pressure Application
Specialized equipment gradually raises the pressure to the target level.
Holding Pressure
The pressure gauge is monitored to confirm stability during the holding period.
Result Evaluation
If no pressure drop occurs within the required time, the pipeline passes the test.
Pressure Standards for Different Pipelines
Gas pipelines: 0.6 MPa, ≥48 hours
Water supply: 0.4–1.0 MPa, depending on building height
Firefighting pipelines: ≥1.6 MPa, up to 2.5 MPa in some regions
Advantages of HDPE Pipes
HDPE pipes provide excellent pressure resistance and sealing performance, making them highly suitable for urban gas networks. They remain stable over long-term use, resisting corrosion and aging, ensuring successful pressure testing and safe pipeline operation.
Conclusion
Pressure testing is a critical step in ensuring the safety of urban gas supply. With scientific construction and strict testing, pipeline systems can operate safely for years. Welping remains committed to providing high-quality welding equipment and solutions to support reliable urban infrastructure.