Use this reference when you need to verify the dimensional identity of 5 inch Schedule STD pipe before preparing drawings, material take-offs, or procurement documents. The page distinguishes the nominal size designation from the actual outside diameter, inside diameter, wall thickness, and unit weight listed in the local data.
For related design work, compare this entry with the site’s references for pipe schedules, steel pipe dimensions, flanges, pipe fittings, and pipe support loads. Those topics help connect the pipe dimensions to adjacent components and installation decisions.
Schedule STD Pipe 5 Inch (DN125) 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 141.3 mm, an inside diameter of 128.2 mm, a wall thickness of 6.55 mm, and a pipe weight of 21.77 kg/m.
5 Inch Schedule STD Pipe Dimensions
The following values are listed for NPS 5 Schedule STD pipe, which corresponds to DN125 in metric designation.
- Pipe Size: NPS 5 Inch
- DN Size: DN125
- Outside Diameter (OD): 141.3 mm
- Inside Diameter (ID): 128.2 mm
- Wall Thickness: 6.55 mm
- Pipe Weight: 21.77 kg/m
- Pipe Weight Including Water: 34.67 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule STD Pipe 5 Inch (DN125) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| STD | 5 Inch | 125 | 141.3 | 128.2 | 6.55 | 21.77 |
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 5 Inch Schedule STD Pipe
5 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 5 inch DN125, 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 5 and DN125 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 5 and DN125, which is the standard naming format widely used in piping drawings, specifications, and procurement documents.
Conclusion
Schedule STD Pipe 5 Inch (DN125) is listed on the current page with 141.3 mm OD, 128.2 mm ID, 6.55 mm wall thickness, and 21.77 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 schedule, NPS, and DN designations to confirm that the selected entry matches the project specification. Then use the listed OD when checking fit-up, clamps, sleeves, fittings, and connection interfaces. The listed ID is the relevant dimensional reference for flow-area and hydraulic review, while wall thickness supports fabrication, corrosion-allowance review, and dimensional coordination.
The listed unit weight can support material take-offs, transportation planning, lifting reviews, and preliminary support-load checks. When the line contains fluid, the page also provides a separate pipe-weight-with-water value. This should be treated as a reference condition rather than a complete operating load case; valves, insulation, supports, fittings, internal deposits, and other contents may also affect the final load.
Coordination Checks Before Procurement
- Confirm that the project specification calls for Schedule STD rather than another wall designation.
- Check that the pipe’s material, manufacturing requirements, corrosion allowance, and temperature or pressure service are defined separately from dimensional selection.
- Coordinate the pipe OD and nominal size with the selected elbows, tees, reducers, flanges, valves, and couplings.
- Use the pipe dimensions when reviewing clearances, support spacing, access, welding preparation, and installation sequence.
- For CAD or drafting work, pair this dimensional reference with the related DWG pipe detail and project-specific connection information.
Schedule identification establishes a dimensional reference; it does not by itself establish allowable pressure, structural capacity, corrosion performance, or suitability for a particular fluid service. Final selection should follow the governing project specification and engineering review.
Related PipeSTD References
Readers comparing alternatives may also benefit from the site’s pipe schedule comparison, NPS-to-DN terminology guide, pipe weight references, flange dimension references, and steel pipe CAD resources. These are useful internal-link destinations because they answer the next questions that typically arise after confirming a pipe size.
Frequently Asked Questions
What does Schedule STD mean?
Schedule STD means Standard Weight in the IPS pipe system. It identifies a standard wall-thickness designation and should be used together with the applicable pipe size and dimensional reference.
Is NPS 5 the same designation as DN125?
On this page, NPS 5 and DN125 identify the same nominal pipe size in inch-based and metric naming systems. They are nominal designations, so they should not be interpreted as the actual measured OD or ID.
Which dimension is used for fitting and clearance checks?
The outside diameter is the primary dimensional reference for external fit-up, clamps, sleeves, and many component interfaces. The selected fitting or flange standard and the project specification should also be checked.
Which dimension matters for flow calculations?
The inside diameter is the relevant dimensional input for flow-area and hydraulic calculations. Actual system performance also depends on fluid properties, flow conditions, roughness, fittings, elevation, and other design inputs.
Does the listed pipe weight represent the complete installed line load?
No. The listed pipe weight is a pipe reference value. An installed-line review may also need fluid contents, fittings, valves, insulation, supports, coatings, and other attached components.
Can the Schedule STD designation alone confirm pressure suitability?
No. Pressure suitability requires review of material, temperature, fluid service, corrosion allowance, manufacturing requirements, code rules, and the project design basis. Schedule selection alone is not a complete pressure design check.