This page provides a quick reference for 1/2 inch Schedule 40S pipe dimensions, also identified as DN15. Use the dimensional data below when checking piping layouts, fabrication details, material takeoffs, and procurement documents.
For related design work, compare this reference with the site’s resources on stainless steel pipe schedules, pipe fittings and flanges, pipe supports, and CAD/DWG piping details. Always verify connection compatibility, material requirements, service conditions, and project specifications before using the dimensions for fabrication or engineering design.
Schedule 40S Pipe 1/2 Inch (DN15) 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.
1/2 Inch Schedule 40S Pipe Dimensions
- Pipe Schedule: 40S
- Nominal Pipe Size: 1/2 Inch
- DN Size: DN15
- Outside Diameter (OD): 21.3 mm
- Inside Diameter (ID): 15.76 mm
- Wall Thickness: 2.77 mm
- Pipe Weight: 1.27 kg/m
- Pipe Weight Including Water: 1.46 kg/m
- Standard: ANSI/ASME B36.19
Schedule 40S Pipe 1/2 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 40S | 1/2 | 15 | 21.3 | 15.76 | 2.77 | 1.27 |
What Is 1/2 Inch Schedule 40S Pipe?
A 1/2 inch Schedule 40S pipe is a stainless steel pipe with a nominal size of 1/2 inch and a wall thickness defined by the 40S schedule. For this size, the outside diameter is fixed at 21.3 mm, while the inside diameter is 15.76 mm based on a wall thickness of 2.77 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 1/2 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 branch and service lines
Why Pipe Dimensions Matter
Accurate 1/2 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.
1/2 Inch Schedule 40S Pipe Weight Information
The nominal weight of this pipe size is 1.27 kg/m. When filled with water, the combined weight becomes approximately 1.46 kg/m. This information is useful for lifting plans, support design, and pipe rack load calculations in industrial projects.
Difference Between NPS 1/2 and DN15
NPS 1/2 is the inch-based nominal pipe size, while DN15 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 1/2 inch Schedule 40S pipe dimensions, DN15 Schedule 40S pipe dimensions, 1/2 inch stainless steel pipe weight, DN15 pipe dimensions, or DN15 sch 40s pipe dimensions.
Conclusion
Schedule 40S Pipe 1/2 Inch (DN15) has an outside diameter of 21.3 mm, an inside diameter of 15.76 mm, a wall thickness of 2.77 mm, and a weight of 1.27 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 1/2 inch Schedule 40S pipe dimensions and DN15 pipe dimensions in one place.
How to Read This Pipe Reference
The page combines inch-based and metric terminology so it can be used with drawings, specifications, and purchasing documents that identify the same nominal size differently. NPS 1/2 and DN15 describe the nominal pipe size, while the schedule designation identifies the referenced stainless steel wall-thickness category.
Dimension checks for drafting and fabrication
- Use the outside diameter when checking clearances, clamps, supports, fittings, and connection details.
- Use the inside diameter when reviewing the available flow passage or coordinating process documentation.
- Use the wall thickness when checking specification compliance and fabrication details.
- Use the listed weight per meter for material takeoffs, handling discussions, and preliminary support-load coordination.
Important selection note
Nominal size and schedule identify the dimensional reference, but they do not by themselves complete a piping design. Material grade, joining method, corrosion conditions, temperature, pressure, code requirements, tolerances, and the selected fittings or flanges must be checked against the project specification. Coordinate this page with the site’s pipe flange dimensions, stainless steel fittings, and pipe support design references before issuing drawings or purchase documents.
Using the DWG resource
The downloadable DWG can support layout and drafting workflows. Before incorporating it into a project drawing, confirm units, layer conventions, connection details, and the applicable project or manufacturer requirements. The tabulated values on this page remain the dimensional reference for this pipe entry.
Frequently Asked Questions
What is the DN designation for 1/2 inch Schedule 40S pipe?
The DN designation is DN15. The inch-based designation is NPS 1/2.
What is the outside diameter of this pipe?
The listed outside diameter is 21.3 mm.
What are the inside diameter and wall thickness?
The listed inside diameter is 15.76 mm, and the listed wall thickness is 2.77 mm.
How much does 1/2 inch Schedule 40S pipe weigh?
The listed pipe weight is 1.27 kg/m. The listed weight including water is 1.46 kg/m.
Which standard is referenced for these dimensions?
The page identifies ANSI/ASME B36.19 as the dimensional reference for this stainless steel pipe entry.
Can this data be used to select fittings or flanges?
The outside diameter and nominal size are useful for coordination, but fitting and flange selection also requires checking the connection type, material, rating, standard, and project requirements. Verify the complete assembly before fabrication or installation.