Use this reference when checking 3 1/2 inch Schedule 10 pipe dimensions for piping layouts, material takeoffs, fabrication drawings, and preliminary support planning. The page identifies the NPS and DN designations, then lists the outside diameter, wall thickness, inside diameter, and pipe weight in metric units.
Because nominal pipe size is a designation rather than a direct measurement, the tabulated outside diameter and wall thickness are the values to use when coordinating pipe with fittings, flanges, valves, supports, and CAD details. For related terminology, see the pipe dimensions reference, pipe schedule chart, and NPS to DN conversion guide.
Schedule 10 pipe 3 1/2 inch (DN90) is a standard steel pipe size commonly used in piping design, fabrication, drafting, and estimation work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 3 1/2 Schedule 10 pipe based on ASME B36.10.
3 1/2 Inch Schedule 10 Pipe Dimensions
- Nominal Pipe Size (NPS): 3 1/2 inch
- Diameter Nominal (DN): DN90
- Outside Diameter (OD): 101.6 mm
- Wall Thickness: 3.05 mm
- Inside Diameter (ID): 95.5 mm
- Pipe Weight: 7.41 kg/m
- Pipe Weight Filled With Water: 14.56 kg/m
- Reference Standard: ASME B36.10
Schedule 10 Pipe 3 1/2 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 3 1/2 inch | 90 | 101.6 | 3.05 | 95.5 | 7.41 |
What Does Schedule 10 Mean?
Schedule 10 refers to the wall thickness series of the pipe. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness changes depending on the schedule. A thicker wall generally increases pipe weight and reduces the inside diameter.
Typical Uses of 3 1/2 Inch Schedule 10 Pipe
NPS 3 1/2 Schedule 10 pipe is commonly used in utility systems, water transfer lines, low-pressure process piping, drainage applications, and general fabrication work where a lighter wall thickness is suitable. It is also a practical reference size for material takeoff, support planning, and piping layout.
Why Pipe Weight Matters
Pipe weight per meter is important for transport planning, support design, structural loading, fabrication estimates, and lifting calculations. Even in smaller piping systems, installed weight can affect support spacing, handling methods, and project cost.
3 1/2 Inch Schedule 10 Pipe Calculation Notes
The listed weight is based on standard steel pipe dimension data using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material grade, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 3 1/2 inch Schedule 10 pipe?
The outside diameter is 101.6 mm.
What is the wall thickness of DN90 Schedule 10 pipe?
The wall thickness is 3.05 mm.
What is the inside diameter of NPS 3 1/2 Schedule 10 pipe?
The inside diameter is 95.5 mm.
How much does 3 1/2 inch Schedule 10 pipe weigh?
The approximate weight is 7.41 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for welded and seamless wrought steel pipe.
Conclusion
Schedule 10 pipe 3 1/2 inch (DN90) has an outside diameter of 101.6 mm, wall thickness of 3.05 mm, inside diameter of 95.5 mm, and a weight of 7.41 kg/m. It is a useful reference for piping design, drafting, estimating, and fabrication work.
How to Use This Pipe Reference
Start with the outside diameter when checking physical clearance, fitting compatibility, sleeve openings, clamps, and support hardware. Use the inside diameter when reviewing flow-area assumptions or comparing the bore with valves and other internal passages. The wall thickness is the key schedule-related dimension and helps distinguish this entry from other wall series for the same nominal size.
NPS, DN, and measured dimensions
NPS 3 1/2 and DN90 identify the same nominal pipe size in different designation systems. Neither label should be treated as the actual outside or inside diameter. The dimensional values in the source table should control drafting and coordination, while the applicable material and product requirements should be confirmed for the project.
Weight and estimating use
The listed pipe weight supports material takeoffs, transport planning, lifting reviews, and preliminary support-load estimates. The water-filled figure is useful when considering the combined pipe-and-fluid load. For a more complete estimate, account separately for fittings, flanges, valves, insulation, coatings, supports, and other attached items. A pipe weight calculator reference can help organize those checks, but it does not replace project-specific engineering review.
Coordination with fittings and drawings
When preparing a piping layout or CAD model, coordinate the tabulated outside diameter with fitting and flange selections rather than relying only on the nominal designation. The downloadable pipe CAD and DWG resources can support drafting workflows, subject to checking the drawing units, connection details, and project specification before issue.
Important specification check
Dimension data identifies the geometric pipe entry; it does not by itself establish pressure capability, corrosion allowance, allowable stress, joining method, or service suitability. Confirm material, manufacturing requirements, inspection requirements, and design conditions through the project specification and the responsible engineer. Supplier data should also be checked when procurement tolerances or actual delivered mass matter.
Additional Questions About 3 1/2 Inch Schedule 10 Pipe
Is DN90 the actual inside diameter?
No. DN90 is a nominal metric designation. The applicable inside and outside diameters are the dimensional values listed in the reference table.
Does Schedule 10 identify the pipe material?
No. Schedule 10 describes the wall-thickness series for the nominal pipe size. Material grade, manufacturing requirements, and service limits must be specified separately.
Which dimension is most useful for fitting coordination?
The outside diameter is generally the primary geometric check for external fit and connection coordination. The fitting, flange, valve, and manufacturer documentation should still be checked for the complete connection arrangement.
Can the listed pipe weight be used as a final support load?
It can provide a starting point for planning, but a final support or structural check should include the operating contents and all relevant attached components. Confirm the design basis with the responsible engineer.