This reference brings together the dimensional, weight, terminology, and drafting information needed to review Schedule STD Pipe 2 1/2 Inch (DN65). Use the data below when comparing piping specifications, checking fitting coordination, preparing material take-offs, or reviewing a CAD reference. For related research, connect this page with your internal references for pipe schedules, NPS and DN conversions, steel pipe fittings, and flange dimensions.
Schedule STD Pipe 2 1/2 Inch (DN65) is a steel pipe size commonly used in industrial and utility piping systems where standard dimensions, structural reliability, and dependable flow capacity are important. Based on the current page data under ANSI/ASME B36.10, this pipe size has an outside diameter of 73 mm, an inside diameter of 62.68 mm, a wall thickness of 5.16 mm, and a pipe weight of 8.63 kg/m.
2 1/2 Inch Schedule STD Pipe Dimensions
The following values are listed for NPS 2 1/2 Schedule STD 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): 62.68 mm
- Wall Thickness: 5.16 mm
- Pipe Weight: 8.63 kg/m
- Pipe Weight Including Water: 11.71 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule STD Pipe 2 1/2 Inch (DN65) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| STD | 2 1/2 Inch | 65 | 73 | 62.68 | 5.16 | 8.63 |
What Is Schedule STD Pipe?
Schedule STD means Standard Weight in the IPS pipe system and is commonly referenced for carbon steel and steel pipe dimensions under ASME B36.10. In practical piping work, Schedule STD is used as a standard wall thickness designation for many nominal pipe sizes. It helps engineers, fabricators, and buyers confirm dimensional compatibility, estimate weight, and coordinate with fittings, flanges, supports, and structural loads.
Common Uses of 2 1/2 Inch Schedule STD Pipe
2 1/2 inch Schedule STD pipe is commonly used in industrial and utility piping systems where good flow capacity and standard steel pipe dimensions are required. This size is often selected for water, cooling, transmission, and plant services where reliable dimensional data is important for design, fabrication, and construction.
- Water transmission lines for plant and utility service
- Cooling water systems in industrial facilities
- Stormwater and drainage piping in infrastructure projects
- Industrial utility piping for bulk fluid transport
- Pipeline headers and manifolds in process plants
- Pump suction and discharge lines where larger diameter piping is needed
- Municipal and public works projects requiring steel pipe sizes
- Replacement and upgrade projects where standard pipe dimensions are required
In practical engineering work, this pipe size may be reviewed when checking flow capacity, support loading, transport weight, handling requirements, and installation planning. Final pipe selection should always be verified against project pressure, temperature, fluid type, corrosion allowance, and material specifications.
Why OD, ID, Thickness, and Weight Matter
Exact OD, ID, wall thickness, and weight values are important for support design, material take-off, transport planning, lifting studies, welding preparation, and installation work. For a pipe as large as 2 1/2 inch DN65, accurate weight data is useful for support design, material planning, and installation review. Inside diameter is also important for flow calculations and hydraulic 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, specifications, and procurement documents.
Conclusion
Schedule STD Pipe 2 1/2 Inch (DN65) is listed on the current page with 73 mm OD, 62.68 mm ID, 5.16 mm wall thickness, and 8.63 kg/m weight. It is a useful steel pipe reference for engineers, designers, and buyers who need standard dimensional and weight data for piping systems and project coordination.
How to Use This Pipe Reference
Start with the nominal designation, then confirm the outside diameter, inside diameter, wall thickness, and weight in the table. These values serve different purposes: outside diameter supports fit-up and connection coordination, inside diameter informs flow-area review, wall thickness supports fabrication and specification checks, and weight assists with handling and support coordination.
The terms NPS 2 1/2 and DN65 identify the same nominal pipe size using different designation systems. They should not be treated as a direct statement of the measured outside or inside diameter. Always use the listed dimensional data when preparing drawings, checking clearances, or coordinating with valves, fittings, flanges, and supports.
Important Checks Before Procurement or Fabrication
- Confirm that the specified schedule agrees with the project piping class and material requirements.
- Check that connected fittings, flanges, valves, and gaskets match the required nominal size and connection details.
- Use the listed weight basis consistently when preparing material take-offs or support reviews.
- Verify fluid service, pressure, temperature, corrosion allowance, joining method, and applicable project requirements before final selection.
- Review the downloadable DWG together with the dimensional table rather than relying on a drawing symbol or nominal label alone.
Useful companion resources include pages covering pipe wall thickness, pipe weight calculations, ASME B36.10 pipe dimensions, pipe supports, and piping isometric drawings. These links can help readers move from a single-size lookup to broader design and drafting guidance.
Reading the Weight Information
The page separates the pipe weight from the pipe weight including water. That distinction matters when reviewing transport, lifting, temporary handling, or support loads. Use the appropriate basis for the engineering check, and do not substitute one value for the other without confirming the intended service condition.
The supplied DWG is useful as a drafting reference for layout and coordination. It should be checked against the authoritative table and project documents before it is used for fabrication, procurement, or construction.
Frequently Asked Questions
What does Schedule STD mean?
Schedule STD means Standard Weight in the IPS pipe system. It identifies a standard wall designation used for dimensional coordination and specification work; it is not a substitute for confirming the material, pressure class, or project requirements.
Are NPS 2 1/2 and DN65 the same pipe size?
They are the two nominal designations shown for this pipe size: NPS uses inch-based terminology, while DN uses metric nominal terminology. Dimensional checks should be made using the listed OD, ID, and wall thickness.
Why are both OD and ID provided?
Outside diameter is commonly needed for fit-up, supports, clamps, and connection coordination. Inside diameter is relevant to flow-area review and hydraulic calculations. Both should be checked against the applicable project requirements.
What is the difference between pipe weight and pipe weight including water?
Pipe weight describes the pipe itself, while pipe weight including water accounts for the listed water-filled condition. The appropriate value depends on whether the review concerns storage, transport, lifting, operating loads, or support design.
Can the DWG be used directly for fabrication?
The DWG is a reference resource for drafting and coordination. Confirm dimensions, connection details, material requirements, tolerances, and project-specific instructions before using any drawing for fabrication or construction.