Schedule 40S Pipe 18 Inch (DN450) is a stainless steel pipe size commonly used in industrial piping systems that require corrosion resistance, dependable wall thickness, and large flow capacity. This pipe size is often used in process plants, utility systems, water treatment projects, and stainless steel fabrication work.
This dimension data is based on ANSI/ASME B36.19, which is the standard commonly used for stainless steel pipe dimensions.
18 Inch Schedule 40S Pipe Dimensions
- Pipe Schedule: 40S
- Nominal Pipe Size: 18 Inch
- DN Size: DN450
- Outside Diameter (OD): 457 mm
- Inside Diameter (ID): 437.94 mm
- Wall Thickness: 9.53 mm
- Pipe Weight: 105.5 kg/m
- Pipe Weight Including Water: 150.55 kg/m
- Standard: ANSI/ASME B36.19
Schedule 40S Pipe 18 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 40S | 18 | 450 | 457 | 437.94 | 9.53 | 105.5 |
What Is 18 Inch Schedule 40S Pipe?
A 18 inch Schedule 40S pipe is a stainless steel pipe with a nominal size of 18 inches and a wall thickness defined by the 40S schedule. For this size, the outside diameter is fixed at 457 mm, while the inside diameter is 437.94 mm based on a wall thickness of 9.53 mm.
The letter S in 40S is commonly used for stainless steel pipe dimensions under ASME B36.19. This makes Schedule 40S pipe a common reference for design, drafting, fabrication, and procurement in stainless piping systems.
Where Is Schedule 40S Pipe 18 Inch Used?
This pipe size is commonly used in applications that need both large flow capacity and the corrosion resistance of stainless steel. Typical uses include:
- Process piping in industrial plants
- Water treatment and utility systems
- Food and beverage piping lines
- Chemical service piping
- Large stainless steel header systems
Why Pipe Dimensions Matter
Accurate 18 inch Schedule 40S pipe dimensions are important for piping layout, fabrication, support design, transport planning, and material takeoff. Engineers and designers often check OD, ID, wall thickness, and weight before selecting flanges, fittings, supports, and installation methods.
The outside diameter is important for matching clamps, flanges, and pipe supports. The inside diameter helps estimate flow capacity and internal area. The wall thickness is a key factor for specification compliance and mechanical strength, while the pipe weight per meter is useful for structural loading and handling calculations.
18 Inch Schedule 40S Pipe Weight Information
The nominal weight of this pipe size is 105.5 kg/m. When filled with water, the combined weight becomes approximately 150.55 kg/m. This information is useful for lifting plans, support design, and pipe rack load calculations in industrial projects.
Difference Between NPS 18 and DN450
NPS 18 is the inch-based nominal pipe size, while DN450 is the metric designation used in international drawings and specifications. Both terms refer to the same nominal pipe size, and users may search by either inch or DN format depending on project standards.
Common Search Terms for This Pipe Size
Users may also search for this pipe using related keywords such as 18 inch Schedule 40S pipe dimensions, DN450 Schedule 40S pipe dimensions, 18 inch stainless steel pipe weight, DN450 pipe dimensions, or DN450 sch 40s pipe dimensions.
Conclusion
Schedule 40S Pipe 18 Inch (DN450) has an outside diameter of 457 mm, an inside diameter of 437.94 mm, a wall thickness of 9.53 mm, and a weight of 105.5 kg/m. It is a useful stainless steel pipe reference size for design, drafting, fabrication, and procurement work.
This page provides a quick reference for engineers, drafters, fabricators, and buyers who need reliable 18 inch Schedule 40S pipe dimensions and DN450 pipe dimensions in one place.