Schedule 40S Pipe 12 Inch (DN300) is a stainless steel pipe size commonly used in industrial piping systems that require corrosion resistance, dependable wall thickness, and reliable 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.
12 Inch Schedule 40S Pipe Dimensions
- Pipe Schedule: 40S
- Nominal Pipe Size: 12 Inch
- DN Size: DN300
- Outside Diameter (OD): 323.9 mm
- Inside Diameter (ID): 304.84 mm
- Wall Thickness: 9.53 mm
- Pipe Weight: 73.88 kg/m
- Pipe Weight Including Water: 146.82 kg/m
- Standard: ANSI/ASME B36.19
Schedule 40S Pipe 12 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 40S | 12 | 300 | 323.9 | 304.84 | 9.53 | 73.88 |
What Is 12 Inch Schedule 40S Pipe?
A 12 inch Schedule 40S pipe is a stainless steel pipe with a nominal size of 12 inches and a wall thickness defined by the 40S schedule. For this size, the outside diameter is fixed at 323.9 mm, while the inside diameter is 304.84 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 designation is widely used by engineers, fabricators, and procurement teams when selecting stainless steel piping for industrial service.
Where Is Schedule 40S Pipe 12 Inch Used?
This pipe size is commonly used in systems that need both good flow capacity and the corrosion resistance of stainless steel. Typical applications include:
- Process piping in industrial plants
- Water treatment and utility systems
- Food and beverage piping lines
- Chemical service piping
- Stainless steel header systems
Why Pipe Dimensions Matter
Accurate 12 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 area and system capacity. The wall thickness is important for specification compliance and mechanical strength, while the pipe weight per meter is useful for structural loading, support design, and handling calculations.
12 Inch Schedule 40S Pipe Weight Information
The nominal weight of this pipe size is 73.88 kg/m. When filled with water, the combined weight becomes approximately 146.82 kg/m. This information is useful for lifting plans, support design, and pipe rack load calculations in industrial projects.
Difference Between NPS 12 and DN300
NPS 12 is the inch-based nominal pipe size, while DN300 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 12 inch Schedule 40S pipe dimensions, DN300 Schedule 40S pipe dimensions, 12 inch stainless steel pipe weight, DN300 pipe dimensions, or DN300 sch 40s pipe dimensions.
Conclusion
Schedule 40S Pipe 12 Inch (DN300) has an outside diameter of 323.9 mm, an inside diameter of 304.84 mm, a wall thickness of 9.53 mm, and a weight of 73.88 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 12 inch Schedule 40S pipe dimensions and DN300 pipe dimensions in one place.