Schedule STD Pipe 12 Inch (DN300) is a steel pipe size commonly used in industrial and utility piping systems where standard dimensions, structural reliability, and dependable flow capacity are important. Based on the current page data under ANSI/ASME B36.10, this pipe size has an outside diameter of 323.9 mm, an inside diameter of 304.74 mm, a wall thickness of 9.53 mm, and a pipe weight of 73.86 kg/m.
12 Inch Schedule STD Pipe Dimensions
The following values are listed for NPS 12 Schedule STD pipe, which corresponds to DN300 in metric designation.
- Pipe Size: NPS 12 Inch
- DN Size: DN300
- Outside Diameter (OD): 323.9 mm
- Inside Diameter (ID): 304.74 mm
- Wall Thickness: 9.53 mm
- Pipe Weight: 73.86 kg/m
- Pipe Weight Including Water: 146.76 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule STD Pipe 12 Inch (DN300) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| STD | 12 Inch | 300 | 323.9 | 304.74 | 9.53 | 73.86 |
What Is Schedule STD Pipe?
Schedule STD means Standard Weight in the IPS pipe system and is commonly referenced for carbon steel and steel pipe dimensions under ASME B36.10. In practical piping work, Schedule STD is used as a standard wall thickness designation for many nominal pipe sizes. It helps engineers, fabricators, and buyers confirm dimensional compatibility, estimate weight, and coordinate with fittings, flanges, supports, and structural loads.
Common Uses of 12 Inch Schedule STD Pipe
12 inch Schedule STD pipe is commonly used in industrial and utility piping systems where good flow capacity and standard steel pipe dimensions are required. This size is often selected for water, cooling, transmission, and plant services where reliable dimensional data is important for design, fabrication, and construction.
- Water transmission lines for plant and utility service
- Cooling water systems in industrial facilities
- Stormwater and drainage piping in infrastructure projects
- Industrial utility piping for bulk fluid transport
- Pipeline headers and manifolds in process plants
- Pump suction and discharge lines where larger diameter piping is needed
- Municipal and public works projects requiring steel pipe sizes
- Replacement and upgrade projects where standard pipe dimensions are required
In practical engineering work, this pipe size may be reviewed when checking flow capacity, support loading, transport weight, handling requirements, and installation planning. Final pipe selection should always be verified against project pressure, temperature, fluid type, corrosion allowance, and material specifications.
Why OD, ID, Thickness, and Weight Matter
Exact OD, ID, wall thickness, and weight values are important for support design, material take-off, transport planning, lifting studies, welding preparation, and installation work. For a pipe as large as 12 inch DN300, accurate weight data is useful for crane selection, support design, and logistics planning. Inside diameter is also important for flow calculations and hydraulic capacity review.
NPS 12 and DN300 Explained
NPS means nominal pipe size in inch units, while DN means diameter nominal in metric units. The current page identifies this pipe as NPS 12 and DN300, which is the standard naming format widely used in piping drawings, specifications, and procurement documents.
Conclusion
Schedule STD Pipe 12 Inch (DN300) is listed on the current page with 323.9 mm OD, 304.74 mm ID, 9.53 mm wall thickness, and 73.86 kg/m weight. It is a useful steel pipe reference for engineers, designers, and buyers who need standard dimensional and weight data for piping systems and project coordination.