HDPE Transition 3PE Steel Transition Adapter for Fuel Gas

Key Features

• 3-layer anti-corrosion coating (3PE) on steel interface
• Electrofusion or butt fusion connection for HDPE end
• Full-metal mechanical sealing system
• Pressure testing port integrated
• Cathodic protection compatibility

Typical Applications

• Municipal gas main rehabilitation projects
• LNG refueling station piping systems
• High-pressure gas transmission transition sections
• Industrial fuel gas supply lines
• Underground utility tunnel gas pipelines

Manufacturing Process

CNC precision machining + automated coating application line

• Steel substrate blast cleaning Sa 2.5 grade
• Epoxy powder coating thickness 200±30μm
• HDPE injection molding temperature 210–230℃
• Sealing surface flatness ≤0.1mm
• Coating peel strength ≥150N/cm

Raw Material Characteristics

• PE100 RC: MRS 10.0 MPa (ISO 9080)
• Steel yield strength ≥235 MPa
• Melt flow index (190℃/5kg) 0.2–0.4 g/10min
• Slow crack growth resistance >500h (ISO 13479)
• 3PE coating cathodic disbondment ≤8mm

• Legacy steel gas network to HDPE pipeline integration
• Transition connections for gas pipelines crossing railways/highways
• Inlet/outlet connections at gas pressure regulation stations
• High-pressure PE to steel valve transitions
• Liquefied petroleum gas (LPG) transfer station piping