Schedule XXS Pipe 2 1/2 Inch (DN65) is a heavy-wall steel pipe size used in industrial piping systems, plant construction, high-duty utility lines, and fabrication work. This page provides a practical reference for the main dimensions and weight of 2 1/2 inch XXS pipe based on ANSI/ASME B36.10.
For piping engineers, designers, estimators, fabrication teams, and site supervisors, accurate pipe size data is important for layout work, material takeoff, support design, transport planning, and installation checks. This guide presents the essential dimensions in a cleaner format that adds more value than a simple size table.
2 1/2 Inch Schedule XXS Pipe Dimensions
- Pipe Size: 2 1/2 Inch
- Nominal Diameter: DN65
- Pipe Schedule: XXS (Double Extra Strong)
- Outside Diameter (OD): 73 mm
- Inside Diameter (ID): 44.96 mm
- Wall Thickness: 14.02 mm
- Pipe Weight: 20.39 kg/m
- Pipe Weight Including Water: 21.97 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XXS Pipe 2 1/2 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 2 1/2″ | 65 | 73 | 44.96 | 14.02 | 20.39 |
What Does Schedule XXS Mean?
Schedule XXS means Double Extra Strong. It is a heavy-wall pipe designation used for applications that need thicker pipe walls than standard or lighter schedules. A thicker wall affects the inside diameter, pipe weight, fabrication requirements, support loading, and handling during installation.
For a size such as 2 1/2 inch DN65 pipe, the jump to XXS creates a much heavier pipe than lighter schedules, so correct dimension and weight data are important for design, lifting, and field work.
Why 2 1/2 Inch DN65 XXS Pipe Dimensions Matter
Knowing the exact dimensions of 2 1/2 inch Schedule XXS pipe is useful for several engineering and construction tasks:
- Fabrication: OD and wall thickness are needed for cutting, beveling, welding, and fit-up work.
- Support Design: Pipe weight per meter helps engineers check support spacing and structural loads.
- Flow Review: ID is useful for estimating internal flow area and hydraulic performance.
- Transport and Lifting: Heavy-wall pipes require accurate weight data for safer handling and crane planning.
- Schedule Comparison: Engineers often compare XXS with XS, STD, Sch 80, Sch 160, or other heavy-wall options during design review.
Typical Applications of 2 1/2 Inch Schedule XXS Pipe
This pipe size may be used in:
- Heavy-duty industrial piping
- High-pressure process systems
- Power and utility projects
- Plant piping works
- Oil and gas facilities
- Custom steel fabrication and spool projects
Engineering Notes
NPS means Nominal Pipe Size, while DN means Diameter Nominal. Although this pipe is called 2 1/2 inch, the actual outside diameter is 73 mm according to the standard. The inside diameter changes with the pipe schedule because wall thickness changes from one schedule to another.
That means if you compare the same 2 1/2 inch pipe in a different schedule, the OD usually stays the same, while the ID, wall thickness, and pipe weight will change.
Reference
The dimension data on this page is based on ANSI/ASME B36.10, which is widely used for steel pipe dimensions in industrial applications.