This reference provides the dimensional and weight data for Schedule 80S pipe 3 1/2 inch (DN90), including outside diameter, inside diameter, wall thickness, and mass per unit length. Use the table alongside the related pipe schedule, fitting, flange, and drafting references when checking a piping layout or preparing a material take-off.
For CAD and drafting work, the downloadable DWG can help with layout coordination. Always confirm the project material specification, design conditions, joining details, and applicable procurement requirements before issuing fabrication or construction documents.
Schedule 80S Pipe 3 1/2 Inch (DN90) 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 101.6 mm, an inside diameter of 85.44 mm, a wall thickness of 8.08 mm, and a pipe weight of 18.64 kg/m.
3 1/2 Inch Schedule 80S Pipe Dimensions
The following values are listed for NPS 3 1/2 Schedule 80S 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): 85.44 mm
- Wall Thickness: 8.08 mm
- Pipe Weight: 18.64 kg/m
- Pipe Weight Including Water: 24.37 kg/m
- Reference Standard: ANSI/ASME B36.19
Schedule 80S Pipe 3 1/2 Inch (DN90) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 80S | 3 1/2 Inch | 90 | 101.6 | 85.44 | 8.08 | 18.64 |
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 3 1/2 Inch Schedule 80S Pipe
3 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 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, isometrics, and procurement specifications.
Conclusion
Schedule 80S Pipe 3 1/2 Inch (DN90) is listed on the current page with 101.6 mm OD, 85.44 mm ID, 8.08 mm wall thickness, and 18.64 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 Schedule 80S Pipe Reference
The dimensional data on this page is useful at several stages of piping work. Designers can review the pipe envelope and flow passage during layout development, while estimators and buyers can use the listed mass data for quantity and handling assessments. Fabricators can also compare the pipe dimensions with compatible fittings, flanges, valves, and weld details.
Check nominal size separately from measured dimensions
NPS and DN are nominal designations rather than direct substitutes for measured outside or inside diameter. When coordinating drawings, specifications, and supplier documents, check the nominal designation together with the applicable schedule and dimensional standard. This helps prevent mismatches between pipe, fittings, and connected components.
Use the table with related piping references
For broader design checks, link this page with the site’s pipe schedule chart, stainless steel pipe dimensions, and NPS to DN conversion references. Component coordination may also require the relevant pipe fittings, flange dimensions, and pipe support guides. These cross-references provide context without replacing the project specification or engineering review.
Review the DWG before using it in a drawing set
The available DWG is a drafting aid for layout and coordination. Before incorporating it into a controlled drawing, check units, insertion scale, connection orientation, layer conventions, and compatibility with the project’s CAD standards. The source dimensional table remains the controlling reference for the values presented on this page.
Design and Procurement Checks
- Confirm that the selected pipe schedule matches the project specification.
- Verify material grade, corrosion requirements, temperature limits, and pressure design separately.
- Coordinate the pipe dimensions with fittings, flanges, valves, gaskets, and welding requirements.
- Use the listed weight data with the project’s support, lifting, transport, and load assessment procedures.
- Check supplier documentation and tolerances before fabrication or installation.
Frequently Asked Questions
What are the listed dimensions for Schedule 80S pipe 3 1/2 inch (DN90)?
The page lists an outside diameter of 101.6 mm, an inside diameter of 85.44 mm, and a wall thickness of 8.08 mm.
What is the listed weight of this pipe?
The listed pipe weight is 18.64 kg/m. The page also provides a separate value for pipe weight including water, which should be used only in the context of the stated reference data.
Does Schedule 80S identify the stainless steel material grade?
No. Schedule 80S identifies a stainless steel pipe wall-thickness series and dimensional reference. The material grade, corrosion requirements, and design suitability must be confirmed from the project specification and purchase documents.
Is DN90 the same designation as NPS 3 1/2?
This page identifies the pipe as NPS 3 1/2 and DN90. These are nominal designations used to coordinate piping documents; the listed OD, ID, and wall thickness should still be checked when selecting connected components.
Can the DWG be used directly for fabrication?
The DWG is provided as a drafting and layout reference. Review its units, scale, project CAD requirements, and dimensional coordination before using it in a controlled fabrication or construction document.