This reference page brings together the key dimensional, weight, and terminology information for Schedule 5 Pipe 3 1/2 Inch (DN90). Use the table below for quick checking during piping layout, drafting, fabrication, procurement, and material takeoff work.
For efficient navigation, compare the listed dimensions with related references for pipe schedules, NPS and DN designations, pipe fittings and flanges, and CAD/DWG pipe resources. The dimensional values on this page remain the controlling local reference for this pipe size.
Schedule 5 Pipe 3 1/2 Inch (DN90) is a steel pipe size commonly used in industrial piping systems that require good flow capacity with a relatively light wall thickness. This pipe size is often used in utility piping, water systems, low-pressure industrial service, and general steel pipe fabrication work.
This dimension data is based on ANSI/ASME B36.10, which is the standard commonly used for carbon steel pipe dimensions.
3 1/2 Inch Schedule 5 Pipe Dimensions
- Pipe Schedule: 5
- Nominal Pipe Size: 3 1/2 Inch
- DN Size: DN90
- Outside Diameter (OD): 101.6 mm
- Inside Diameter (ID): 97.38 mm
- Wall Thickness: 2.11 mm
- Pipe Weight: 5.18 kg/m
- Pipe Weight Including Water: 12.62 kg/m
- Standard: ANSI/ASME B36.10
Schedule 5 Pipe 3 1/2 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 5 | 3 1/2 | 90 | 101.6 | 97.38 | 2.11 | 5.18 |
What Is 3 1/2 Inch Schedule 5 Pipe?
A 3 1/2 inch Schedule 5 pipe is a steel pipe with a nominal size of 3 1/2 inches and a relatively thin wall thickness compared with heavier schedules. For this size, the outside diameter is fixed at 101.6 mm, while the inside diameter is 97.38 mm based on a wall thickness of 2.11 mm.
Schedule 5 pipe is often selected when a project needs good flow capacity, reduced pipe weight, and easier handling compared with thicker wall pipes. It is commonly referenced in steel piping design, drafting, fabrication, and material takeoff work.
Where Is Schedule 5 Pipe 3 1/2 Inch Used?
This pipe size is commonly used in applications that need good flow capacity with relatively light wall thickness. Typical uses include:
- Water transfer and distribution systems
- Utility and low-pressure industrial piping
- Process and service lines
- Pipe spool fabrication and layout work
- General steel piping projects
Why Pipe Dimensions Matter
Accurate 3 1/2 inch Schedule 5 pipe dimensions are important for piping layout, fabrication, transport planning, support design, and installation work. Engineers and designers often check OD, ID, wall thickness, and weight before selecting supports, fittings, welding details, and handling methods.
The outside diameter is important for matching supports, clamps, and pipe accessories. The inside diameter helps estimate internal flow area and system capacity. The wall thickness affects mechanical strength and specification compliance, while the pipe weight per meter is useful for lifting plans, transport, and structural loading calculations.
3 1/2 Inch Schedule 5 Pipe Weight Information
The nominal weight of this pipe size is 5.18 kg/m. When filled with water, the combined weight becomes approximately 12.62 kg/m. This information is useful for pipe support design, structural coordination, and lifting preparation in piping systems.
Difference Between NPS 3 1/2 and DN90
NPS 3 1/2 is the inch-based nominal pipe size, while DN90 is the metric designation used in international drawings and specifications. Both terms refer to the same nominal pipe size, and users may search by either inch size or DN format depending on project standards.
Common Search Terms for This Pipe Size
Users may also search for this pipe using related keywords such as 3 1/2 inch Schedule 5 pipe dimensions, DN90 Schedule 5 pipe dimensions, 3 1/2 inch pipe weight per meter, DN90 pipe dimensions, or DN90 sch 5 pipe dimensions.
Conclusion
Schedule 5 Pipe 3 1/2 Inch (DN90) has an outside diameter of 101.6 mm, an inside diameter of 97.38 mm, a wall thickness of 2.11 mm, and a weight of 5.18 kg/m. It is a useful steel pipe reference size for design, drafting, fabrication, and procurement work.
This page provides a quick reference for engineers, drafters, fabricators, and buyers who need reliable 3 1/2 inch Schedule 5 pipe dimensions and DN90 pipe dimensions in one place.
How to Read This Pipe Reference
The nominal size identifies the pipe designation used in drawings and specifications, while the outside diameter is the practical dimension used when coordinating supports, clamps, sleeves, fittings, and other external interfaces. The inside diameter is more relevant to flow-area estimates and hydraulic coordination.
Schedule 5 identifies the wall-thickness category shown in the source data. It should not be treated as a complete pressure rating. Any pressure or service assessment also requires confirmation of the material specification, temperature, joining method, corrosion allowance, applicable design code, and project requirements.
Design and Drafting Checks
- Use the outside diameter when checking physical clearances, support contact, and connection interfaces.
- Use the inside diameter when preparing preliminary flow or hydraulic coordination work.
- Use wall thickness and pipe weight when coordinating fabrication, handling, supports, and structural loads.
- Confirm that connected fittings, flanges, valves, and branch components use compatible dimensional references.
- Check the project specification before procurement, because nominal size alone does not define material grade or service suitability.
Using the DWG Reference
The downloadable DWG can support drafting and layout workflows, but CAD geometry should be checked against the dimensional table before it is used for fabrication or construction documentation. Confirm units, drawing scale, connection details, and revision status in the working project file.
Useful related references include the site’s guides to pipe dimension tables, schedule selection, flange dimensions, fitting terminology, and pipe support coordination. These topics help connect nominal pipe designations with the components and documentation used in a complete piping system.
Frequently Asked Questions
What does Schedule 5 mean for this pipe?
Schedule 5 identifies the wall-thickness category associated with this pipe entry. It does not, by itself, establish an allowable pressure or confirm suitability for a particular service.
Are NPS 3 1/2 and DN90 the same nominal pipe size?
Yes. NPS 3 1/2 is the inch-based designation and DN90 is the metric designation used for the same nominal pipe size. Always check the project standard and the actual dimensional requirements when coordinating components.
Which dimension should be used for support and clamp coordination?
The outside diameter is the primary dimension for external supports, clamps, sleeves, and clearance checks. The source table should be used when precise coordination is required.
Which dimension is relevant to flow calculations?
The inside diameter is the relevant dimensional reference for estimating internal flow area. Final hydraulic calculations should also account for the complete piping system and applicable design criteria.
Can this reference be used for fabrication?
It can support preliminary drafting, material takeoff, and coordination. Before fabrication, verify the project specification, material requirements, connected components, weld details, and the current approved drawing package.