1. Check the Lumen and Wall Thickness
Firstly, observe whether the lumen is regular and the wall thickness is uniform. For high-quality steel wire pipes, their inner cavity and outer edge are evenly distributed within the standard circular pipe wall. Take a large steel wire pipe with an inner diameter of 89mm and a wall thickness of 7mm as an example. In contrast, for poor-quality pipes, the wall thickness can reach 7.5mm at the thickest part, while the thinnest part is only 5.5mm. As a result, when these pipes work under high pressure, they are likely to burst or deform because the stress on the pipe wall is uneven.
2. Examine the Pipe Wall for Flaws
Secondly, check if there are bubbles or other visible objects on the wall of the steel wire pipe. The wall of high-quality steel wire pipes is crystal clear and free of impurities. However, due to aging or long-term improper storage, the color of defective steel pipes may turn yellow.
3. Smell the Pipe
Thirdly, take a whiff of the steel wire pipe. High-quality ones have only a slight plastic smell, with no odor of other petrochemical products. In contrast, low-grade steel pipes emit a diesel smell, especially during summer.
4. Feel the Surface Texture
Fourthly, touch the steel wire pipe. High-quality ones have smooth inner and outer walls, providing a good hand feel. On the contrary, inferior pipes have a rough surface.
5. Measure the Wall Thickness Correctly
When measuring the wall thickness, follow these steps. First, cut off both ends of the large steel wire tube. Then, select the middle part of the pipe as a sample for testing. This approach is to prevent some unethical manufacturers from manipulating the two ends of the pipeline, as the actual wall thickness in the middle is often thinner than at the two ends.