1. Q: What is black steel pipe?
A: Carbon steel pipe with a dark iron oxide scale coating formed during manufacturing. It's used for non-corrosive applications like gas and water lines.
2. Q: What is galvanized steel pipe?
A: A carbon steel pipe coated with a layer of zinc (by hot-dip galvanizing) to protect against corrosion. Common in plumbing and outdoor applications.
3. Q: What is a major disadvantage of galvanized pipe for potable water?
A: Over time, internal corrosion can release zinc and rust, potentially affecting water quality and causing reduced flow.
4. Q: What does "DOE" or "DOM" pipe mean?
A: Drawn Over Mandrel. It's a cold-drawn ERW tube with the weld seam annealed, offering excellent dimensional accuracy, smooth surface, and high strength. Used in hydraulic cylinders and precision applications.
5. Q: What is spiral welded pipe?
A: A pipe made by helically winding and welding a steel coil. It allows for large diameters and is often used for water transmission, piling, and slurry lines.
