PE water supply pipes, PE gas pipes, and PE oil pipes are all types of polyethylene (PE) piping systems. They are primarily made from high-density polyethylene (HDPE) and typically use hot-melt welding for connections. While they share some similarities in material and installation methods, their applications, structures, and characteristics differ significantly. Let's explore the key differences between them.
One of the most noticeable differences is the color of the pipe. Although all three are generally black, each has a distinct colored stripe on the outer surface. PE water supply pipes are marked with a blue line, PE gas pipes have a yellow line, and PE oil pipes feature a green line. This color coding helps in quick identification during installation or maintenance.
Another distinction lies in the number of lines or layers. PE water and gas pipes are usually single-layer systems, while PE oil pipes can be either single-layer or multi-layer. Single-layer oil pipes often have two sets of four green stripes per set, while casing-type oil pipes feature six green stripes. This design helps in identifying the type of fluid being transported.
The structural composition also varies. PE water and gas pipes are typically single-layer, whereas PE oil pipes may consist of multiple layers. For example, double-layer oil pipes might have an EVOH (ethylene-vinyl alcohol) oxygen barrier layer as the inner layer, with an outer layer of PE or PEX. A hot-melt adhesive layer is placed between the two. Other configurations include a PE or PEX inner layer with an EVOH outer layer, or a three-layer structure with EVOH in the middle and PE/PEX on both sides. These layered designs help prevent contamination and ensure safe transport of sensitive fluids like fuel.
Diameters also vary depending on the application. PE water supply pipes come in larger sizes, ranging from 32mm up to 1200mm. PE gas pipes are slightly smaller, with common diameters starting at 20mm up to 630mm. PE oil pipes, on the other hand, are generally smaller, with typical sizes ranging from 63mm to 110mm. The size of the pipe is determined by the flow requirements and pressure conditions of the system.
In summary, while all three types of PE pipes are made from similar materials and use similar connection techniques, they are designed for different purposes and environments. Understanding these differences helps in selecting the right pipe for the right application. If you're unsure about which type to choose, it's always best to consult with a professional who can guide you based on your specific needs.
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