This reference page provides the dimensional data, weight information, and practical selection context for Schedule 80 pipe 2 1/2 inch (DN65). Use the table for checking outside diameter, inside diameter, wall thickness, and mass per unit length during piping layout, fabrication, estimating, and procurement.
The page also explains how nominal pipe size, DN identification, schedule, and actual dimensions relate to one another. For drafting work, the accompanying DWG download can support preliminary CAD coordination, while the listed dimensions remain the controlling reference for this page.
Schedule 80 Pipe 2 1/2 Inch (DN65) is a heavy wall steel pipe commonly used in industrial piping systems that require higher strength and thicker pipe walls than lighter schedules. This pipe size is based on ANSI/ASME B36.10 and is widely used in process piping, utility systems, water treatment plants, and mechanical services. For this size, the standard data shows an outside diameter of 73 mm, an inside diameter of 58.98 mm, a wall thickness of 7.01 mm, and a pipe weight of 11.41 kg/m.
Schedule 80 Pipe 2 1/2 Inch (DN65) Dimensions
- Pipe Standard: ANSI/ASME B36.10
- Nominal Pipe Size: 2 1/2 inch
- DN Size: DN65
- Outside Diameter (OD): 73 mm
- Inside Diameter (ID): 58.98 mm
- Wall Thickness: 7.01 mm
- Pipe Weight: 11.41 kg/m
- Pipe Weight Including Water: 14.14 kg/m
What Is Schedule 80 Pipe?
Schedule 80 refers to a pipe wall thickness classification. For the same nominal pipe size, a Schedule 80 pipe has a thicker wall and a smaller inside diameter than lower schedule pipes. This makes it a practical choice for systems that need additional pipe strength, durability, and long-term service performance.
Why 2 1/2 Inch DN65 Pipe Dimensions Matter
Knowing the exact dimensions of a 2 1/2 inch Schedule 80 pipe is important for piping design, fabrication, and installation. The outside diameter helps with flange matching, clamps, and supports. The inside diameter affects flow area and system capacity. The wall thickness is important for strength and service conditions, while the pipe weight per meter is useful for transport, lifting plans, and structural support calculations.
Common Uses of Schedule 80 Pipe 2 1/2 Inch (DN65)
This pipe size is often used in industrial and commercial piping systems such as:
- Water treatment and utility piping
- Process and plant piping systems
- Oil and gas applications
- Pump stations and mechanical services
- Heavy-duty industrial pipe networks
2 1/2 Inch Schedule 80 Pipe Data Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 2 1/2 inch | 65 | 73 | 58.98 | 7.01 | 11.41 |
Additional Information for Engineers and Buyers
Before selecting this pipe size, it is also important to review the material grade, end type, design pressure, corrosion allowance, operating temperature, and project code requirements. While Schedule 80 defines the dimensional wall category, the final pipe selection should always match the actual service condition and engineering specification.
Note: NPS means nominal pipe size in inches, while DN means diameter nominal in millimeters. These are standard reference sizes used for pipe identification.
How to Use This Schedule 80 DN65 Reference
Nominal pipe size is an identification system rather than a direct statement of the measured outside or inside diameter. That distinction matters when checking connections, clearances, supports, insulation space, and routing details. DN is the metric designation used alongside the NPS description, so both identifiers should be retained in drawings, material takeoffs, and purchase documents.
Schedule describes the pipe wall category for a given nominal size. It should not be treated as a complete material or pressure rating. Final selection also depends on the pipe material grade, manufacturing specification, corrosion allowance, temperature, design pressure, end preparation, joining method, and governing project requirements.
Dimension Checks for Piping Design
- Outside diameter: Check this dimension when coordinating flanges, fittings, clamps, guides, sleeves, supports, and equipment connections.
- Inside diameter: Use it when reviewing flow passage, hydraulic calculations, cleaning access, and compatibility with connected components.
- Wall thickness: Confirm that the schedule and material specification meet the applicable design and corrosion requirements.
- Pipe weight: Include the listed pipe mass in handling, transport, support spacing, and structural load reviews. The water-inclusive figure should be considered separately from the dry pipe weight when evaluating operating loads.
Related Pipe Reference Topics
For broader design work, connect this page with the site’s references for pipe dimensions and schedules, pipe fittings, flange dimensions, pipe supports, and piping terminology. These related resources help readers move from a dimensional check to connection selection, layout coordination, and drafting review without confusing nominal designations with measured geometry.
Use the downloadable DWG as a drafting aid, then verify interfaces against the project drawings, component specifications, and applicable engineering requirements before fabrication.
FAQ: Schedule 80 Pipe 2 1/2 Inch (DN65)
What does Schedule 80 mean for this pipe?
Schedule 80 identifies a wall thickness category for the nominal pipe size. It does not, by itself, define the material grade, allowable pressure, temperature limit, corrosion performance, or complete design suitability.
Are 2 1/2 inch and DN65 the same pipe designation?
They are the NPS and DN identifiers used for the same reference pipe size on this page. They are nominal designations, so the actual outside and inside dimensions should be taken from the supplied dimensional data rather than inferred from the label alone.
Why are both dry weight and weight including water shown?
Dry pipe weight supports shipping, handling, and some support calculations. The water-inclusive value represents a different load condition and is useful when reviewing an operating, filled piping system. The applicable contents, insulation, valves, fittings, and support arrangement must also be evaluated separately.
Can the listed pipe be selected from schedule alone?
No. Confirm the material specification, service fluid, design pressure, operating temperature, corrosion allowance, end type, joining requirements, and project code before purchase or design approval.
What is the DWG file used for?
The DWG file can help with preliminary CAD layout and coordination. It should be checked against the project model, connection details, tolerances, and the authoritative dimensional information before fabrication.