Galvanized steel pipes come in a variety of sizes, diameters, and wall thicknesses to suit different applications. The most common sizing standards are based on Nominal Pipe Size (NPS) in inches or millimeters, along with Schedule (SCH) numbers that indicate wall thickness.
1. Common Diameter Sizes
Galvanized pipes are available in standard nominal diameters, such as:
Small Diameter Pipes (for plumbing, electrical conduit, etc.):
1/2" (DN 15)
3/4" (DN 20)
1" (DN 25)
1-1/4" (DN 32)
1-1/2" (DN 40)
2" (DN 50)
Medium to Large Diameter Pipes (for structural applications, water distribution, etc.):
2-1/2" (DN 65)
3" (DN 80)
4" (DN 100)
6" (DN 150)
8" (DN 200)
10" (DN 250)
12" (DN 300)
Larger sizes (up to 48 inches or more) are available for industrial, water supply, and structural projects.
2. Wall Thickness & Pipe Schedules
Galvanized pipes come in different schedules (SCH), which determine the wall thickness:
SCH 10 – Thinner wall, lightweight applications
SCH 20 – Medium-duty applications
SCH 40 – Standard thickness, common for water pipes
SCH 80 – Heavy-duty applications requiring high pressure resistance
SCH 160 and above – Used in specialized industrial applications
3. Pipe Lengths
Galvanized pipes are typically available in standard lengths of:
6 meters (20 feet)
12 meters (40 feet)
Custom-cut lengths for specific project requirements
4. Selecting the Right Size
The choice of pipe size depends on the intended application, such as:
Plumbing & water supply → 1/2" to 2"
Scaffolding & structural support → 2" to 4"
Irrigation & drainage → 6" and above
Industrial piping → Varies based on pressure and flow requirements
