PE water supply pipes, PE gas pipes, and PE oil pipes are all types of polyethylene (PE) pipes. They are primarily made from high-density polyethylene (HDPE) material and are typically connected using hot-melt welding techniques. Although they share similar construction methods, their applications, colors, structures, and dimensions differ significantly. Let’s explore the key differences between them.
1. **Color of the Pipe**
While all three types of PE pipes are mostly black, the outer color markings help distinguish them. PE water supply pipes usually have a blue stripe, PE gas pipes feature a yellow stripe, and PE oil pipes are marked with a green stripe. These color codes make it easy to identify the pipe's purpose at a glance.
2. **Number of Stripes**
The number of colored stripes on the pipe also varies. PE water and gas pipes typically have four stripes, while PE oil pipes come in two types: single-layer pipes and casing pipes. Single-layer oil pipes have two sets of four green stripes each, whereas casing pipes have six green stripes.
3. **Pipe Structure**
The internal structure of these pipes differs as well. PE water and gas pipes are generally single-layer, while PE oil pipes can be either three-layer or five-layer systems. The multi-layer design is essential for preventing permeation and ensuring durability. For example, some oil pipes include an EVOH (ethylene-vinyl alcohol) oxygen barrier layer between two PE layers, with a hot-melt adhesive in between. This structure helps prevent fuel vapor from escaping and maintains system integrity.
4. **Diameter Range**
The diameters of these pipes also vary depending on their use. PE water supply pipes are available in larger sizes, ranging from 32mm up to 1200mm. PE gas pipes are slightly smaller, typically ranging from 20mm to 630mm. In contrast, PE oil pipes are generally smaller, commonly found in sizes like 63mm, 75mm, 90mm, and 110mm.
In addition to these differences, the choice of pipe depends on the specific application, pressure requirements, and environmental conditions. If you're unsure about which type of pipe to use, consulting a professional or the manufacturer is always recommended to ensure the best fit for your project. Understanding these distinctions can help you make informed decisions and avoid potential issues during installation or operation.
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