This reference page brings together the key dimensional and weight information for 1/2 inch Schedule 5 pipe, also identified as DN15. Use it when checking piping layouts, material takeoffs, fabrication drawings, support coordination, or procurement documents.
For drafting workflows, the page also includes a downloadable DWG reference. When comparing this size with other options, review the related pipe schedule guide, NPS and DN reference, and pipe fittings and flange dimensions resources to confirm that connected components use the required dimensional basis.
Schedule 5 Pipe 1/2 Inch (DN15) is a steel pipe size commonly used in industrial piping systems that require good flow capacity with a relatively light wall thickness. This pipe size is often used in utility piping, water systems, low-pressure industrial service, and general steel pipe fabrication work.
This dimension data is based on ANSI/ASME B36.10, which is the standard commonly used for carbon steel pipe dimensions.
1/2 Inch Schedule 5 Pipe Dimensions
- Pipe Schedule: 5
- Nominal Pipe Size: 1/2 Inch
- DN Size: DN15
- Outside Diameter (OD): 21.3 mm
- Inside Diameter (ID): 18 mm
- Wall Thickness: 1.65 mm
- Pipe Weight: 0.8 kg/m
- Pipe Weight Including Water: 1.05 kg/m
- Standard: ANSI/ASME B36.10
Schedule 5 Pipe 1/2 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 5 | 1/2 | 15 | 21.3 | 18 | 1.65 | 0.8 |
What Is 1/2 Inch Schedule 5 Pipe?
A 1/2 inch Schedule 5 pipe is a steel pipe with a nominal size of 1/2 inch and a relatively thin wall thickness compared with heavier schedules. For this size, the outside diameter is fixed at 21.3 mm, while the inside diameter is 18 mm based on a wall thickness of 1.65 mm.
Schedule 5 pipe is often selected when a project needs good flow capacity, reduced pipe weight, and easier handling compared with thicker wall pipes. It is commonly referenced in steel piping design, drafting, fabrication, and material takeoff work.
Where Is Schedule 5 Pipe 1/2 Inch Used?
This pipe size is commonly used in applications that need good flow capacity with relatively light wall thickness. Typical uses include:
- Water transfer and distribution systems
- Utility and low-pressure industrial piping
- Process and service lines
- Pipe spool fabrication and layout work
- General steel piping projects
Why Pipe Dimensions Matter
Accurate 1/2 inch Schedule 5 pipe dimensions are important for piping layout, fabrication, transport planning, support design, and installation work. Engineers and designers often check OD, ID, wall thickness, and weight before selecting supports, fittings, welding details, and handling methods.
The outside diameter is important for matching supports, clamps, and pipe accessories. The inside diameter helps estimate internal flow area and system capacity. The wall thickness affects mechanical strength and specification compliance, while the pipe weight per meter is useful for lifting plans, transport, and structural loading calculations.
1/2 Inch Schedule 5 Pipe Weight Information
The nominal weight of this pipe size is 0.8 kg/m. When filled with water, the combined weight becomes approximately 1.05 kg/m. This information is useful for pipe support design, structural coordination, and lifting preparation in piping systems.
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 size 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 5 pipe dimensions, DN15 Schedule 5 pipe dimensions, 1/2 inch pipe weight per meter, DN15 pipe dimensions, or DN15 sch 5 pipe dimensions.
Conclusion
Schedule 5 Pipe 1/2 Inch (DN15) has an outside diameter of 21.3 mm, an inside diameter of 18 mm, a wall thickness of 1.65 mm, and a weight of 0.8 kg/m. It is a useful 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 5 pipe dimensions and DN15 pipe dimensions in one place.
How to Use This Pipe Reference
Start with the table when you need a quick dimensional check, then use the surrounding explanations to interpret the values in a project context. The outside diameter is the key interface dimension for many clamps, supports, fittings, and layout details. The inside diameter is useful when reviewing the available flow passage, while wall thickness helps distinguish this schedule from thicker-wall alternatives.
The designation NPS 1/2 and the metric designation DN15 identify the same nominal pipe size. These designations are nominal rather than a direct statement of the measured inside or outside diameter, so fabrication and coordination work should use the listed dimensional values.
Design and Drafting Checks
- Use the listed outside diameter when coordinating supports, clamps, sleeves, and connection details.
- Use the listed inside diameter when performing a preliminary flow-area or clearance review.
- Use the wall thickness and applicable project specification when checking fabrication and connection requirements.
- Use the listed pipe weight for preliminary handling, support, and material-takeoff coordination.
- Confirm the required material, joining method, service conditions, and project specification before approving the pipe for a particular installation.
Schedule identifies a dimensional wall-thickness category; it should not be treated as a complete pressure or service qualification by itself. Final selection requires review of the governing design, material, fabrication, and service requirements. For drawing production, compare the dimensional reference with the applicable pipe spool drawing, fitting dimension, and CAD/DWG reference before issuing fabrication information.
Related Reference Topics
Readers comparing this entry with other pipe sizes may also benefit from internal references covering carbon steel pipe dimensions, pipe schedules and wall thickness, DN pipe sizes, pipe weight calculations, and flange and fitting dimensions. These topics help connect a single-size reference to broader piping design and drafting work.
Frequently Asked Questions
What does 1/2 inch Schedule 5 pipe mean?
It identifies a steel pipe with the nominal pipe size NPS 1/2 and the Schedule 5 dimensional category. The same nominal size is designated DN15 in metric terminology.
Are NPS 1/2 and DN15 the same pipe size?
Yes. NPS 1/2 and DN15 are different nominal designations for the same pipe size. The actual dimensional reference should come from the listed outside diameter, inside diameter, and wall thickness.
Which dimension is most important for fitting coordination?
The outside diameter is generally the primary dimensional check for external supports, clamps, and many connection interfaces. The fitting standard and project specification must also be checked before confirming compatibility.
What is the listed weight of this pipe?
The reference lists a pipe weight of 0.8 kg/m and a combined pipe-and-water weight of 1.05 kg/m. These values support preliminary handling and coordination checks; final calculations should use the project requirements and actual installed conditions.
Is Schedule 5 by itself a pressure rating?
No. A schedule describes a pipe dimensional category and does not, by itself, establish suitability for a specific pressure, temperature, fluid, material grade, or design code. Those requirements must be reviewed separately.