This reference provides the key dimensional and weight information for 2 1/2 inch Schedule 5 pipe, also identified as DN65. Use the data below when checking piping layouts, preparing fabrication drawings, coordinating supports, or reviewing material takeoffs.
The page combines a quick dimension summary with practical explanations of outside diameter, inside diameter, wall thickness, weight, and nominal pipe size terminology. A downloadable DWG is also provided for drafting and CAD reference work.
Schedule 5 Pipe 2 1/2 Inch (DN65) 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.
2 1/2 Inch Schedule 5 Pipe Dimensions
- Pipe Schedule: 5
- Nominal Pipe Size: 2 1/2 Inch
- DN Size: DN65
- Outside Diameter (OD): 73 mm
- Inside Diameter (ID): 68.78 mm
- Wall Thickness: 2.11 mm
- Pipe Weight: 3.69 kg/m
- Pipe Weight Including Water: 7.4 kg/m
- Standard: ANSI/ASME B36.10
Schedule 5 Pipe 2 1/2 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 5 | 2 1/2 | 65 | 73 | 68.78 | 2.11 | 3.69 |
What Is 2 1/2 Inch Schedule 5 Pipe?
A 2 1/2 inch Schedule 5 pipe is a steel pipe with a nominal size of 2 1/2 inches and a relatively thin wall thickness compared with heavier schedules. For this size, the outside diameter is fixed at 73 mm, while the inside diameter is 68.78 mm based on a wall thickness of 2.11 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 2 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 2 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.
2 1/2 Inch Schedule 5 Pipe Weight Information
The nominal weight of this pipe size is 3.69 kg/m. When filled with water, the combined weight becomes approximately 7.4 kg/m. This information is useful for pipe support design, structural coordination, and lifting preparation in piping systems.
Difference Between NPS 2 1/2 and DN65
NPS 2 1/2 is the inch-based nominal pipe size, while DN65 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 2 1/2 inch Schedule 5 pipe dimensions, DN65 Schedule 5 pipe dimensions, 2 1/2 inch pipe weight per meter, DN65 pipe dimensions, or DN65 sch 5 pipe dimensions.
Conclusion
Schedule 5 Pipe 2 1/2 Inch (DN65) has an outside diameter of 73 mm, an inside diameter of 68.78 mm, a wall thickness of 2.11 mm, and a weight of 3.69 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 2 1/2 inch Schedule 5 pipe dimensions and DN65 pipe dimensions in one place.
How to Use This Schedule 5 Pipe Reference
Start with the dimension list and table when verifying a line item in a piping model, fabrication drawing, or procurement document. The outside diameter is the primary dimensional reference for clamps, supports, sleeves, and other components that fit around the pipe. The inside diameter is useful when reviewing flow area and connections on the pipe bore side.
For engineering and fabrication work, do not treat the nominal size as a direct measurement. NPS 2 1/2 and DN65 are nominal designations used to identify the same pipe size in different sizing conventions. The actual outside diameter and wall thickness should be taken from the applicable dimension data when coordinating fittings, weld preparations, supports, and clearances.
Related PipeSTD Reference Topics
This page can be used alongside related PipeSTD resources covering pipe schedules, pipe fittings, flanges, and piping terminology. Those references help connect the pipe dimensions to component selection, drawing notation, and installation coordination.
For drafting workflows, download the linked Schedule 5 Pipe 2 1/2 Inch DN65 DWG and verify the drawing against the project specification before using it in a fabrication or construction document. CAD geometry is a reference aid and does not replace project-specific design review or dimensional verification.
Checks Before Using the Data
- Confirm that the project specification calls for the stated nominal size and schedule.
- Check that connected fittings, flanges, valves, and supports use compatible dimensional references.
- Use the listed pipe weight when coordinating handling and support calculations, while accounting for the complete system condition required by the project.
- Verify material, joining method, pressure requirements, corrosion allowance, and applicable design requirements separately; dimensions alone do not establish service suitability.
- Use the applicable governing standard and project documents for final procurement and design decisions.
Frequently Asked Questions
What is the nominal size of this pipe?
The nominal size is 2 1/2 inches, and its metric designation is DN65. These are alternative nominal designations for the same pipe size.
What does Schedule 5 indicate?
Schedule 5 identifies the pipe wall designation used with this nominal size. The page’s dimension list provides the corresponding wall thickness and inside diameter for the referenced pipe.
Which dimensions are most important for drafting?
The outside diameter is important for external clearances, supports, clamps, and sleeves. The inside diameter and wall thickness are useful for checking the pipe bore, connections, and detail requirements. Always use the project-approved dimension data for final drawings.
What is the DWG file used for?
The DWG file provides a CAD reference for layout and drafting tasks involving this pipe size. Review its geometry and units before incorporating it into a project drawing, and confirm all critical dimensions against the applicable project and standard requirements.
Does the listed pipe weight include water?
The page reports both the nominal pipe weight and a combined weight when the pipe is filled with water. Use the appropriate condition for the task being evaluated and confirm whether additional contents, insulation, coatings, or attached components must also be included.