This reference page is for engineers, drafters, fabricators, estimators, and procurement teams checking NPS 2 1/2 Schedule 10S stainless steel pipe data. Use the dimension list and table below when preparing piping layouts, checking material takeoffs, coordinating fittings, or selecting a CAD reference.
The nominal size identifies the pipe designation; it does not directly state the measured outside or inside diameter. For practical drafting and fabrication work, check the listed outside diameter, wall thickness, inside diameter, and mass together. You may also want to compare this entry with related pipe schedules, stainless steel pipe dimensions, pipe fittings, and flange dimensions references on PipeSTD.
Schedule 10S pipe 2 1/2 inch (DN65) is a stainless steel pipe size commonly used in piping design, fabrication, drafting, and engineering reference work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 2 1/2 Schedule 10S pipe based on ASME B36.19.
2 1/2 Inch Schedule 10S Pipe Dimensions
- Nominal Pipe Size (NPS): 2 1/2 inch
- Diameter Nominal (DN): DN65
- Outside Diameter (OD): 73 mm
- Wall Thickness: 3.05 mm
- Inside Diameter (ID): 66.9 mm
- Pipe Weight: 5.26 kg/m
- Pipe Weight Filled With Water: 8.77 kg/m
- Reference Standard: ASME B36.19
- Pipe Type: Stainless Steel Pipe
Schedule 10S Pipe 2 1/2 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 2 1/2 inch | 65 | 73 | 3.05 | 66.9 | 5.26 |
What Does Schedule 10S Mean?
Schedule 10S is a stainless steel pipe schedule covered by ASME B36.19. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness changes with the schedule. The “S” designation is commonly used for stainless steel pipe schedules.
Typical Uses of 2 1/2 Inch Schedule 10S Pipe
NPS 2 1/2 Schedule 10S pipe is commonly used in stainless steel piping systems for industrial plants, utility services, food and beverage facilities, water-related systems, and fabrication work where corrosion resistance and dimensional accuracy are important.
Why Pipe Weight Matters
Pipe weight per meter is useful for transport planning, lifting studies, support design, structural loading, fabrication estimates, and installation planning. In stainless steel piping systems, accurate weight data helps improve material handling, support spacing, and total project cost estimation.
2 1/2 Inch Schedule 10S Pipe Calculation Notes
The listed weight is based on standard stainless steel pipe dimensions using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material grade, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 2 1/2 inch Schedule 10S pipe?
The outside diameter is 73 mm.
What is the wall thickness of DN65 Schedule 10S pipe?
The wall thickness is 3.05 mm.
What is the inside diameter of NPS 2 1/2 Schedule 10S pipe?
The inside diameter is 66.9 mm.
How much does 2 1/2 inch Schedule 10S pipe weigh?
The approximate weight is 5.26 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.19 for stainless steel pipe.
Conclusion
Schedule 10S pipe 2 1/2 inch (DN65) has an outside diameter of 73 mm, wall thickness of 3.05 mm, inside diameter of 66.9 mm, and a weight of 5.26 kg/m. It is a useful reference for piping design, drafting, estimating, and stainless steel fabrication work.
How to Read the Schedule 10S Pipe Data
The table presents the dimensions in millimeters and the mass in kilograms per meter. NPS 2 1/2 and DN65 are nominal designations used to identify the same pipe size in different measurement systems. The outside diameter is the dimensional reference commonly used when coordinating fittings, supports, clamps, and connection details.
The wall thickness describes the pipe section between the outside and inside surfaces. The inside diameter is important when reviewing flow passages, clearance, lining requirements, and the connection between straight pipe and fittings. These values should be checked against the project specification and the selected component standard before fabrication or procurement.
Using the Weight Information
The listed pipe mass supports preliminary material takeoffs, shipping estimates, lifting plans, support-load calculations, and installation planning. The water-filled figure is useful when considering the additional contents load during service or testing. Final support and structural decisions still require the applicable design conditions, attachments, insulation, valves, fittings, and project requirements to be reviewed by a qualified engineer.
Drafting and CAD Workflow
For drawings, use the nominal size and schedule in the callout, then verify the dimensional references used by the connected fittings and flanges. The downloadable DWG can help with layout and drafting coordination, but it should be checked against the project’s CAD standards, modeling conventions, and approved material specification before issue for construction.
Related PipeSTD References
For a broader piping workflow, continue with the site’s references for pipe dimensions and schedules, NPS and DN terminology, stainless steel fittings, flange dimensions, and piping isometric drafting. These related topics help connect a straight-pipe dimension check with the fittings, joints, supports, and drawing details that complete a piping system.
Additional Practical Questions
Are NPS 2 1/2 and DN65 interchangeable labels?
They identify the same nominal pipe size in U.S. customary and metric terminology. Always use the dimensional data and the applicable component standard when checking compatibility.
Does Schedule 10S identify the stainless steel grade?
No. The schedule identifies a pipe wall-thickness designation. The material grade, corrosion requirements, product specification, and fabrication requirements must be confirmed separately.
Can the listed weight be used as the final installed piping load?
It is a useful pipe-mass reference, but the final installed load may also include contents, fittings, valves, insulation, supports, testing conditions, and other attached items.
Is the DWG file ready for every project?
The DWG is a drafting reference. Review its units, layer conventions, connection details, and project requirements before incorporating it into controlled design documentation.