Differences Between Type A and Type B PE Wound Structural Wall Pipes

Polyethylene (PE) wound structural wall pipes are mainly divided into two types: Type A and Type B (according to the GB/T19472.2-2017 standard, Type C pipes have been gradually phased out). Here are the key differences between Type A and Type B pipes:

1. Name

Type A Pipe: Underground PE structural wall pipe Type A, also known as Hollow Wall Wound Pipe, or simply Wound Pipe.
Type B Pipe: Underground PE structural wall pipe Type B, also called Krah Pipe.

2. Appearance

Type A Pipe: Has smooth inner and outer surfaces.
Type B Pipe: Smooth inner wall with a spiral reinforcing rib on the outer wall.

3. Manufacturing Process

Type A Pipe: Manufactured by winding pre-formed square pipes through spiral welding. The square pipe is extruded, cooled, and then wound into a circular pipe.
Type B Pipe: Made from high-density polyethylene resin, using a hot winding process on a preheated steel drum mold, fused with a spiral “O” shaped ribbed polypropylene (PP) hollow pipe on the outer surface.

4. End Type

Type A Pipe: Features a plain end.
Type B Pipe: Features a spigot and socket end.

5. Electrofusion Wire

Type A Pipe: Does not have an electrofusion wire at the end.
Type B Pipe: Has an electrofusion wire at the end.

6. Connection Method

Type A Pipe: Connected using heat-shrink sleeves, rubber ring spigot-socket connections, or stainless steel clamp-type flexible connections.
Type B Pipe: Connected using spigot-socket electrofusion connections.

7. Applications

Type A Pipe: With a thinner wall and lower cost, Type A pipe is suitable for areas with lower soil pressure and lighter loads, primarily used for underground sewage and drainage systems.
Type B Pipe: With a thicker wall and better pressure resistance, Type B pipe is ideal for complex geological conditions, especially areas with high soil pressure or heavy loads. It is a perfect replacement for reinforced concrete and cast iron pipes.

Summary

Type A and Type B PE wound pipes have their own advantages and disadvantages. The choice should depend on the specific application environment and requirements. Type A pipes are suited for low-load and low-pressure areas, while Type B pipes are better suited for more demanding conditions and high-load environments.

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