Double-walled polyethylene three-way junction

A Double-walled polyethylene three-way junction is a specialized pipe fitting (or "tee") used to connect three segments of double-walled high-density polyethylene (HDPE) pipes, primarily in drainage, sewer, or hazardous liquid transfer applications. It ensures that the integrity of both the primary (inner) and secondary (outer) containment walls is maintained at a intersection point. Key Characteristics and Components Structure: It consists of a T-shaped connector, which typically features a smooth inner wall for efficient flow and a corrugated outer wall for high ring stiffness. Three-Way Design: It connects three pipes, usually in a "T" configuration, allowing a branch line to join a main line. Double-Wall Protection: The fitting maintains an annular space between the inner and outer walls. This structure prevents environmental release by containing leaks from the inner pipe, or protects the inner pipe from external damage. Material: Made from High-Density Polyethylene (HDPE), which is highly resistant to corrosion, chemicals, and soil stress, ensuring a long service life. Connection Type: These are commonly connected to pipes via electrofusion welding (creating a monolithic, leak-free seal), heat shrink sleeves, or socket-type rubber ring joints.