This reference provides the dimensional and weight data needed to identify Schedule 80S pipe in NPS 2 1/2 (DN65). Use the table for quick drafting, procurement, estimating, and piping-layout checks, then confirm the project specification before selecting material or preparing fabrication documents.
For related work, this page can be reviewed alongside references for pipe schedules, stainless steel pipe dimensions, flanges, fittings, and pipe support loading. These topics help connect nominal size data with the components and installation conditions used in a complete piping system.
Schedule 80S Pipe 2 1/2 Inch (DN65) is a stainless steel pipe size commonly used in industrial piping systems where corrosion resistance, dimensional consistency, and dependable wall thickness are important. Based on the current page data under ANSI/ASME B36.19, this pipe size has 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.
2 1/2 Inch Schedule 80S Pipe Dimensions
The following values are listed for NPS 2 1/2 Schedule 80S pipe, which corresponds to DN65 in metric designation.
- Pipe Size: NPS 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
- Reference Standard: ANSI/ASME B36.19
Schedule 80S Pipe 2 1/2 Inch (DN65) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 80S | 2 1/2 Inch | 65 | 73 | 58.98 | 7.01 | 11.41 |
What Is Schedule 80S Pipe?
Schedule 80S is a stainless steel pipe schedule designation commonly used under ASME B36.19. In piping design and fabrication, the schedule identifies the wall thickness series for a given nominal pipe size. This helps engineers, buyers, and fabricators confirm dimensional compatibility, estimate pipe weight, and coordinate with fittings, flanges, and supports.
Common Uses of 2 1/2 Inch Schedule 80S Pipe
2 1/2 inch Schedule 80S pipe is commonly used in stainless steel piping systems that require good corrosion resistance, dependable wall thickness, and reliable flow capacity. This size is often selected for industrial projects where standard dimensions are needed for design, fabrication, procurement, and installation work.
- Process piping systems in chemical and industrial plants
- Water transmission lines for industrial and utility service
- Cooling water and utility piping in plant facilities
- Marine and offshore piping where stainless steel is preferred
- Food and beverage plants requiring corrosion-resistant piping materials
- Pharmaceutical facilities using stainless steel process lines
- Pump suction and discharge piping for process and utility systems
- Pipeline modification and replacement work where standard pipe dimensions are required
In practical engineering work, this pipe size may be checked when reviewing flow area, piping layout, support loading, transport weight, and installation requirements. Final pipe selection should always be verified against project pressure, temperature, fluid type, and material specifications.
Why OD, ID, Thickness, and Weight Matter
Exact OD, ID, wall thickness, and weight values are important for pipe support design, material take-off, transport planning, welding preparation, and installation work. Weight data is also useful for lifting calculations and total piping load estimates, while inside diameter affects flow calculations and system capacity review.
NPS 2 1/2 and DN65 Explained
NPS means nominal pipe size in inch units, while DN means diameter nominal in metric units. The current page identifies this pipe as NPS 2 1/2 and DN65, which is the standard naming format widely used in piping drawings, isometrics, and procurement specifications.
Conclusion
Schedule 80S Pipe 2 1/2 Inch (DN65) is listed on the current page with 73 mm OD, 58.98 mm ID, 7.01 mm wall thickness, and 11.41 kg/m weight. It is a useful stainless steel pipe reference for piping engineers, designers, and buyers who need standard dimensional and weight data for project planning and material selection.
How to Use This Pipe Reference
Start with the nominal designation when locating the pipe in drawings, material takeoffs, or purchase descriptions. Use the outside diameter to coordinate fittings, clamps, supports, and layout clearances. Use the inside diameter for flow-area reviews, while wall thickness helps with fabrication checks and dimensional coordination.
The listed pipe weight is useful for estimating handling loads, support reactions, shipping requirements, and overall piping-system weight. The water-inclusive value should be treated as a reference for a filled pipe condition; actual operating loads may also include insulation, lining, valves, fittings, fluid properties, and other attached components.
Important Design and Procurement Checks
- Confirm that the project specification calls for stainless steel pipe and the required material grade before purchasing.
- Check the applicable piping code, design pressure, design temperature, corrosion allowance requirements, and fluid service.
- Coordinate the pipe dimensions with matching fittings, flanges, valves, gaskets, and welding details.
- Use the dimensional data consistently across piping plans, isometric drawings, spool drawings, and CAD or DWG files.
- Have pressure, stress, support, and flexibility checks completed by the responsible engineering team.
A schedule designation identifies a wall-thickness series for a nominal pipe size, but it is not, by itself, a complete pressure-rating or material-selection decision. Project conditions and the governing design requirements must be checked before the pipe is specified for service.
Related Piping References
Readers comparing this entry with other pipe sizes may also benefit from internal references covering NPS and DN conversion, pipe outside and inside diameter, pipe weight calculations, stainless steel pipe schedules, and piping isometric terminology. Those references provide useful context without replacing the authoritative values in the local data table.
Frequently Asked Questions
What does Schedule 80S mean?
Schedule 80S is a stainless steel pipe wall-thickness series used with nominal pipe sizes. It helps designers, fabricators, buyers, and inspectors coordinate pipe dimensions with connected piping components.
Is NPS 2 1/2 the same designation as DN65?
On this page, NPS 2 1/2 and DN65 identify the same nominal pipe size using inch-based and metric naming conventions. They are nominal designations, not direct statements of the measured inside diameter.
Does Schedule 80S alone determine the pipe pressure rating?
No. Pressure suitability depends on factors such as material specification, design temperature, applicable code, manufacturing requirements, corrosion considerations, and the project design basis. The schedule designation should not be used as a standalone pressure-rating decision.
Why are both inside diameter and outside diameter listed?
Outside diameter supports layout and component compatibility checks, while inside diameter is used when reviewing flow area and hydraulic behavior. Both dimensions are important in design and fabrication coordination.
Why is pipe weight important?
Pipe weight supports material estimating, transport planning, lifting reviews, and pipe-support calculations. A filled-pipe review may require the listed water-inclusive reference plus the weight of fittings, valves, insulation, and other attached items.
Can the listed dimensions be used without checking the project specification?
No. The page data is a dimensional reference. Procurement and final design should also confirm the required standard, material grade, manufacturing specification, joining method, service conditions, and applicable engineering code.