Hubei Municipal Gas Pipeline Reconstruction | PE Gas Pipe Trenchless Construction Scheme

Performance Advantage of PE Gas Pipe Adapted to Municipal Gas Retrofit

The renovation of gas pipelines in old urban areas and dense sections of business districts in Hubei generally faces the pain points of staggered underground pipelines and large road traffic flow. Large-scale excavation construction will not only affect residents' travel, but also easily destroy the original underground pipelines. PE gas pipes have the characteristics of corrosion resistance, strong flexibility, long service life, and good hot melt sealing performance of interfaces. They can withstand the pulling and bending stresses during trenchless construction, and will not crack and deform. Compared with traditional steel pipes and cast iron pipes, they are more suitable for the complex construction scenarios of municipal gas transformation.

Key points of preparation and selection for trenchless construction

Before construction, it is necessary to complete the underground pipeline survey of the reconstructed section, clarify the drilling path to avoid water supply, power supply, and communication pipelines, and then select the corresponding wall thickness and specification PE gas pipe according to the project pressure level requirements, and verify in advance that the appearance of the pipe is not damaged and the interface flatness is up to standard. Simultaneously, traffic guidance and publicity of the construction section are done to reduce the impact of construction on residents' lives.

Core Process of Trenchless Construction of PE Gas Pipe

During construction, drilling and reaming operations are completed according to the preset path. Multi-sections of PE gas pipes are spliced into whole sections through hot melt docking. After passing the interface sealing test, the whole section of pipes is slowly pulled into the borehole with traction equipment to complete the laying. After the laying is completed, the air tightness test and pressure test need to be carried out in sequence. After the indicators meet the industry standards, they are connected to the existing gas pipe network, and finally the road surface repair is completed.

Construction acceptance and operation and maintenance precautions

In the acceptance stage, a full set of materials such as pipe test reports and stress testing records need to be retained. In the later operation and maintenance stage, PE gas pipes do not need additional anti-corrosion treatment, and only need to carry out regular pipe network pressure inspections. Compared with traditional pipes, it can reduce the operation and maintenance costs by more than 30%. Meet the long-term use needs of municipal gas pipelines.