This reference is intended for engineers, designers, fabricators, estimators, and CAD users checking 3/4 inch Schedule 160 pipe dimensions. Use the data below to distinguish nominal pipe size from measured outside and inside dimensions, review the effect of a heavy wall on weight and flow space, and support preliminary drafting or material-estimating work.
For broader comparisons, readers may also want to review the site’s related pipe schedule tables, NPS and DN terminology guide, steel pipe dimension references, and CAD/DWG pipe resources.
Schedule 160 pipe 3/4 inch (DN20) is an extra heavy-wall steel pipe size commonly used in piping design, fabrication, drafting, and engineering estimation work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 3/4 Schedule 160 pipe based on ASME B36.10.
3/4 Inch Schedule 160 Pipe Dimensions
- Nominal Pipe Size (NPS): 3/4 inch
- Diameter Nominal (DN): DN20
- Outside Diameter (OD): 26.7 mm
- Wall Thickness: 5.56 mm
- Inside Diameter (ID): 15.58 mm
- Pipe Weight: 2.9 kg/m
- Pipe Weight Filled With Water: 3.09 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 160 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 | 5.56 | 15.58 | 2.9 |
What Does Schedule 160 Mean?
Schedule 160 refers to an extra heavy wall thickness series used for steel pipe under ASME B36.10. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness increases according to the schedule. A much thicker wall reduces the inside diameter and significantly increases pipe weight.
Typical Uses of 3/4 Inch Schedule 160 Pipe
NPS 3/4 Schedule 160 pipe is commonly referenced for very heavy-duty industrial piping systems where extremely high wall thickness is required. It may be used in process piping, utility lines, compact piping layouts, fabrication work, and engineering applications where pipe strength and wall thickness are more critical than maximum flow area.
Why Pipe Weight Matters
Pipe weight per meter is essential for transport planning, lifting studies, support design, structural loading, fabrication estimates, and installation planning. For a 3/4 inch Schedule 160 pipe, the extra heavy wall thickness results in much higher installed weight than lighter schedules, so accurate weight data is important for engineering and construction work.
3/4 Inch Schedule 160 Pipe Calculation Notes
The listed weight is based on standard steel pipe dimensions using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material specification, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 3/4 inch Schedule 160 pipe?
The outside diameter is 26.7 mm.
What is the wall thickness of DN20 Schedule 160 pipe?
The wall thickness is 5.56 mm.
What is the inside diameter of NPS 3/4 Schedule 160 pipe?
The inside diameter is 15.58 mm.
How much does 3/4 inch Schedule 160 pipe weigh?
The approximate weight is 2.9 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 160 pipe 3/4 inch (DN20) has an outside diameter of 26.7 mm, wall thickness of 5.56 mm, inside diameter of 15.58 mm, and a weight of 2.9 kg/m. It is a useful reference for piping design, fabrication, estimating, and heavy-duty industrial engineering work.
How to Use This Pipe Reference
The dimension list and data table are useful when checking a piping model, preparing a material takeoff, or comparing this entry with another schedule for the same nominal size. The outside diameter is the fixed external reference shown for this pipe size, while the wall thickness determines how much of the cross-section remains as the internal opening.
Because Schedule 160 uses a heavy wall, the listed inside diameter is substantially smaller than the outside diameter. That distinction matters when checking clearance, fittings, sleeves, connected components, flow area, and weight-related loads. Nominal size should therefore not be treated as a direct measurement of either the outside or inside diameter.
Design and Drafting Considerations
- Use the outside diameter when coordinating clamps, supports, sleeves, and external clearances.
- Use the inside diameter when reviewing internal passage space or comparing flow paths.
- Use the wall thickness and pipe weight when preparing fabrication, handling, support, or installation estimates.
- Confirm the material specification, manufacturing tolerances, joining method, and project design requirements before using the reference for final engineering decisions.
- Do not infer an allowable pressure or a complete design rating from the schedule designation alone; those checks require the applicable material, temperature, code, and project data.
The downloadable DWG can support drafting workflows, but the drawing should be checked against the project specification and the connected fitting, flange, valve, or support geometry before release.
Related Pipe References
This page works well as a starting point for internal navigation to related content on Schedule 160 pipe, pipe wall thickness, ASME B36.10 steel pipe dimensions, pipe weight calculations, and DWG detail downloads. These links help readers move from a single-size lookup to schedule comparison and practical design guidance.
Additional Questions About This Reference
Is 3/4 inch the measured inside diameter?
No. The inch designation is the nominal pipe size. The measured outside diameter, wall thickness, and inside diameter are listed separately in the reference data.
Does Schedule 160 describe the pipe material grade?
No. The schedule identifies a wall-thickness series. Material grade, manufacturing requirements, and other product details must be confirmed separately from the applicable specification and project documents.
Can this data be used to select a pipe support?
It can provide dimensional and weight input for preliminary coordination, but final support selection also depends on span, operating conditions, loads, restraint requirements, and the governing design criteria.
Why should the DWG be checked before use?
A CAD file is a drafting aid. Confirm its dimensions, units, layer standards, connection geometry, and revision status before incorporating it into a released drawing.