This reference page brings together the key dimension and weight information for 3/4 inch Schedule 10 pipe, also identified as NPS 3/4 and DN20. Use the source table when checking outside diameter, wall thickness, inside diameter, or mass for piping layouts, material takeoffs, fabrication documents, and CAD work.
For broader context, compare this entry with the site’s reference on pipe schedules, the guide to NPS and DN pipe sizing, and related steel pipe dimensions. Those resources help explain how nominal size differs from measured diameter and why schedule selection should not be treated as a pressure rating by itself.
Schedule 10 pipe 3/4 inch (DN20) 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 3/4 Schedule 10 pipe based on ASME B36.10.
3/4 Inch Schedule 10 Pipe Dimensions
- Nominal Pipe Size (NPS): 3/4 inch
- Diameter Nominal (DN): DN20
- Outside Diameter (OD): 26.7 mm
- Wall Thickness: 2.11 mm
- Inside Diameter (ID): 22.48 mm
- Pipe Weight: 1.28 kg/m
- Pipe Weight Filled With Water: 1.67 kg/m
- Reference Standard: ASME B36.10
Schedule 10 Pipe 3/4 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 3/4 inch | 20 | 26.7 | 2.11 | 22.48 | 1.28 |
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 3/4 Inch Schedule 10 Pipe
NPS 3/4 Schedule 10 pipe is commonly used in utility systems, water 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.
3/4 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 3/4 inch Schedule 10 pipe?
The outside diameter is 26.7 mm.
What is the wall thickness of DN20 Schedule 10 pipe?
The wall thickness is 2.11 mm.
What is the inside diameter of NPS 3/4 Schedule 10 pipe?
The inside diameter is 22.48 mm.
How much does 3/4 inch Schedule 10 pipe weigh?
The approximate weight is 1.28 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 3/4 inch (DN20) has an outside diameter of 26.7 mm, wall thickness of 2.11 mm, inside diameter of 22.48 mm, and a weight of 1.28 kg/m. It is a useful reference for piping design, drafting, estimating, and fabrication work.
How to Use This Pipe Reference
The values on this page are most useful when several drawing and estimating tasks must use the same dimensional basis. Designers can use the outside diameter when coordinating clearances, clamps, supports, fittings, and branch connections. The inside diameter is more relevant to flow-area checks and internal clearances, while wall thickness supports fabrication review and dimensional verification.
Because nominal pipe size is a designation rather than a direct measurement, do not assume that the stated pipe size equals either the outside or inside diameter. Confirm the applicable dimension in the source table before preparing a spool drawing, routing model, bill of materials, or procurement description.
Schedule Selection and Engineering Checks
A schedule identifies a wall-thickness series for a given nominal pipe size. It does not, by itself, establish allowable pressure, temperature limits, corrosion allowance, joining requirements, or code compliance. Those checks depend on the material, service conditions, manufacturing specification, design code, and project requirements. Use the dimensional data here alongside the applicable engineering calculations and procurement documents.
Drafting and Takeoff Considerations
- Use consistent NPS, DN, and outside-diameter terminology across drawings and specifications.
- Check that connected fittings, flanges, valves, and supports use compatible dimensional references.
- Use the listed mass for preliminary estimating, handling review, and support-load studies, then confirm the supplier’s product data for purchasing or final fabrication.
- For CAD work, download the accompanying 3/4 inch Schedule 10 pipe DWG and verify units, insertion point, layer settings, and project drafting conventions before use.
Additional internal references for this workflow include pipe fitting dimensions, flange dimensions, pipe weight calculations, and the site’s piping drafting guide. Link these topics where readers need to move from straight-pipe dimensions to complete piping assemblies.
Schedule 10 Pipe 3/4 Inch: Additional Questions
Is Schedule 10 a pressure rating?
No. Schedule 10 describes a wall-thickness series. Pressure capability must be evaluated using the material, design temperature, service, joining method, applicable code, and required allowances.
Why are NPS 3/4 and DN20 shown together?
NPS and DN are different pipe-size designation systems used in engineering documents and product references. Showing both identifiers helps users match drawings, specifications, catalogs, and supplier information without assuming that either designation is a direct diameter measurement.
Should the published weight be used for final procurement?
Use the listed value as a reference for estimating and preliminary planning. Final purchasing and fabrication should be checked against the manufacturer’s dimensional and mass data, because actual products can vary within applicable manufacturing tolerances.
What should be checked before connecting fittings or flanges?
Confirm the nominal size, outside-diameter basis, wall series, connection type, material requirements, and the governing project specification. The matching fitting or flange reference should be verified rather than selected from nominal size alone.