This reference provides the dimensional and weight data used to identify Schedule STD Pipe 3 1/2 Inch (DN90) in piping layouts, procurement documents, fabrication work, and installation planning. Use the table for the page’s authoritative values, then confirm the project specification before ordering or designing around the pipe.
The page also clarifies how NPS, DN, pipe schedule, outside diameter, inside diameter, wall thickness, and unit weight relate to one another. For related drafting work, connect this reference with your internal resources for pipe schedules, pipe fittings, flanges, and CAD/DWG piping details.
Schedule STD Pipe 3 1/2 Inch (DN90) 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 101.6 mm, an inside diameter of 90.12 mm, a wall thickness of 5.74 mm, and a pipe weight of 13.57 kg/m.
3 1/2 Inch Schedule STD Pipe Dimensions
The following values are listed for NPS 3 1/2 Schedule STD pipe, which corresponds to DN90 in metric designation.
- Pipe Size: NPS 3 1/2 Inch
- DN Size: DN90
- Outside Diameter (OD): 101.6 mm
- Inside Diameter (ID): 90.12 mm
- Wall Thickness: 5.74 mm
- Pipe Weight: 13.57 kg/m
- Pipe Weight Including Water: 19.94 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule STD Pipe 3 1/2 Inch (DN90) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| STD | 3 1/2 Inch | 90 | 101.6 | 90.12 | 5.74 | 13.57 |
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 3 1/2 Inch Schedule STD Pipe
3 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 3 1/2 inch DN90, 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 3 1/2 and DN90 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 3 1/2 and DN90, which is the standard naming format widely used in piping drawings, specifications, and procurement documents.
Conclusion
Schedule STD Pipe 3 1/2 Inch (DN90) is listed on the current page with 101.6 mm OD, 90.12 mm ID, 5.74 mm wall thickness, and 13.57 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 identification: NPS 3 1/2 and DN90 identify the same pipe size in inch-based and metric naming systems. The nominal designation is used for coordination; it should not be treated as a direct substitute for the measured outside or inside diameter shown in the data.
For layout and connection work, the outside diameter helps coordinate fittings, clamps, supports, sleeves, and fabrication clearances. The inside diameter is the relevant dimensional reference for reviewing the available flow passage. The listed wall thickness supports detailing and material verification, while the listed pipe weight assists with takeoffs, handling, supports, and installation planning.
Checks to Make Before Using the Data
- Confirm that the pipe schedule matches the project piping specification.
- Check the material grade, corrosion allowance, joining method, and applicable purchasing requirements separately.
- Coordinate the pipe with the selected fittings, flanges, valves, supports, and connection details.
- Use the inside diameter and project fluid data for a properly reviewed hydraulic calculation rather than relying on nominal size alone.
- For structural, pressure, lifting, or support decisions, have the complete design basis reviewed by the responsible engineer.
The downloadable DWG can support drafting and coordination, but a CAD file does not replace dimensional verification against the applicable project documents and the page’s current data table. This makes the reference useful alongside internal pages on pipe dimension terminology, fitting dimensions, flange standards, and pipe support design.
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 does not by itself define every material, pressure, temperature, or service requirement.
Is NPS 3 1/2 the same pipe size as DN90?
Yes. On this page, NPS 3 1/2 and DN90 are the inch-based and metric nominal designations for the same pipe size.
Which dimension should be used for flow review?
The listed inside diameter is the dimensional starting point for reviewing the flow passage. A complete hydraulic review also requires the project fluid, operating conditions, pipe length, fittings, elevation effects, and other system inputs.
Why is outside diameter important if the pipe size is nominal?
Outside diameter is important for physical coordination, including fittings, supports, clamps, sleeves, clearances, and fabrication. Nominal pipe size provides the identification, while the dimensional table provides the specific outside diameter for coordination.
Can the DWG file be used for fabrication?
The DWG is a drafting reference for coordination. Before fabrication, verify its geometry and notes against the current dimensional table, project drawings, material requirements, connection details, and approved engineering documents.
Does the listed pipe weight include water?
The page separately lists pipe weight and pipe weight including water. Use the appropriate value for the task being reviewed, and confirm the project assumptions when calculating support, transport, or operating loads.