This reference page is designed for quick engineering checks of Schedule 30 pipe 3/4 inch (DN20). Use the dimensional data when preparing piping layouts, CAD drawings, material takeoffs, fabrication documents, or preliminary support-load reviews.
For the clearest interpretation, treat the nominal size, outside diameter, inside diameter, wall thickness, and weight as separate pieces of information. The nominal designation identifies the pipe size category, while the listed dimensions provide the values needed for layout and coordination.
Schedule 30 pipe 3/4 inch (DN20) is a standard steel pipe size commonly used in piping design, drafting, fabrication, estimation, and industrial layout work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 3/4 Schedule 30 pipe based on ASME B36.10.
For engineers, designers, estimators, and CAD users, quick access to accurate pipe data helps improve piping layout, support planning, weight checks, transport review, and fabrication coordination during project development.
3/4 Inch Schedule 30 Pipe Dimensions
- Nominal Pipe Size (NPS): 3/4 inch
- Diameter Nominal (DN): DN20
- Outside Diameter (OD): 26.7 mm
- Wall Thickness: 2.41 mm
- Inside Diameter (ID): 21.88 mm
- Pipe Weight: 1.44 kg/m
- Pipe Weight Including Water: 1.81 kg/m
- Standard: ASME B36.10
Schedule 30 Pipe 3/4 Inch Data Table
| NPS | DN | Outside Diameter (OD) | Wall Thickness | Inside Diameter (ID) | Weight |
|---|---|---|---|---|---|
| 3/4 inch | DN20 | 26.7 mm | 2.41 mm | 21.88 mm | 1.44 kg/m |
Understanding 3/4 Inch Schedule 30 Pipe
3/4 inch Schedule 30 pipe is a standard steel pipe size used as a reference in industrial piping layouts, utility systems, water lines, process design studies, and CAD drafting. With an outside diameter of 26.7 mm and a wall thickness of 2.41 mm, this pipe size is suitable for light piping applications where designers need a balance between flow capacity and pipe wall strength.
What Does Schedule 30 Mean?
Schedule 30 refers to the wall thickness series of the pipe. For NPS 3/4, Schedule 30 gives a wall thickness of 2.41 mm. The schedule affects the inside diameter, total pipe weight, fabrication planning, and compatibility with supports, fittings, and structural loading requirements.
Why These Pipe Dimensions Matter
Accurate pipe dimension data is important for piping layouts, spool drawings, support design, structural load review, and material takeoff. Knowing that this pipe weighs 1.44 kg/m helps with transport estimates, lifting plans, and support loading. If the pipe is filled with water, the total weight increases to 1.81 kg/m, which is useful for operating load calculations and support checks.
Common Uses of DN20 Schedule 30 Pipe
DN20 Schedule 30 pipe may be referenced in industrial utility systems, water transfer lines, plant layout studies, process piping documentation, and engineering design work. It is also useful for piping designers, CAD users, estimators, and procurement teams who need standard steel pipe dimensions for piping systems.
Difference Between NPS 3/4 and DN20
NPS 3/4 is the inch-based nominal pipe size designation, while DN20 is the metric nominal diameter reference. Both refer to the same pipe size category on this page. The actual standard outside diameter for this size is 26.7 mm.
How to Use This Data
You can use this page to quickly check:
- pipe outside diameter for layout and clearance
- inside diameter for flow reference
- wall thickness for schedule comparison
- weight per meter for estimation and transport planning
- water-filled weight for support and structural load review
Quick Reference for Schedule 30 Pipe 3/4 Inch
- Pipe Size: 3/4 inch
- DN: DN20
- OD: 26.7 mm
- ID: 21.88 mm
- Wall Thickness: 2.41 mm
- Weight: 1.44 kg/m
- Weight Including Water: 1.81 kg/m
- Reference Standard: ASME B36.10
Related Pipe Size Pages
Conclusion
Schedule 30 Pipe 3/4 Inch (DN20) is an important steel pipe reference for piping design, drafting, estimation, and fabrication work. With its 26.7 mm outside diameter, 2.41 mm wall thickness, and 1.44 kg/m pipe weight, it provides useful dimensional data for engineers and designers who need fast and accurate pipe information.
Note: NPS = Nominal Pipe Size, DN = Diameter Nominal. Dimensions and weights shown here are based on ASME B36.10 steel pipe data.
How to Read This Pipe Reference
Start with NPS 3/4 and DN20 to confirm that the selected size matches the intended piping record. Use the outside diameter when checking physical clearance, connection alignment, insulation space, and CAD geometry. Use the inside diameter as a dimensional reference for flow-related reviews, while recognizing that actual hydraulic performance also depends on the piping system and service conditions.
The wall thickness identifies the Schedule 30 section listed on this page. It is useful for comparing pipe records and coordinating fabrication details, but a schedule designation alone does not establish whether a pipe is acceptable for a particular pressure, temperature, material, corrosion, or code application. Those checks require the applicable project specifications and engineering verification.
Using the Weight Values
The listed pipe weight is useful for material estimating, handling discussions, transport planning, and preliminary support-load coordination. The water-filled value represents a different loading condition from the empty-pipe value. Clearly identify which condition is being used in drawings, calculations, and review comments so that empty and operating cases are not confused.
CAD and Drafting Notes
When creating a CAD block or checking an existing drawing, use the listed outside diameter for the pipe envelope and the listed inside diameter for the bore representation. Keep the nominal designation and schedule in the component description so the geometry is not separated from the pipe specification. The downloadable DWG can support drafting workflows, but dimensions should still be checked against the authoritative table on this page before fabrication or procurement.
For comparison work, the related Schedule 30 pipe 1/2 inch (DN15) and Schedule 30 pipe 1 inch (DN25) pages provide adjacent size references.
Frequently Asked Questions
What is the difference between NPS 3/4 and DN20?
NPS 3/4 is the inch-based nominal pipe size designation, while DN20 is the metric nominal reference for the same size category. Neither designation should be treated as the measured outside diameter.
What does Schedule 30 identify?
Schedule 30 identifies the wall-thickness series for the pipe size listed on this page. The schedule affects the inside diameter and pipe weight, so it should remain part of the pipe description in drawings, takeoffs, and procurement records.
Which weight should be used for a support review?
Use the empty-pipe weight for the empty condition and the water-filled weight for the corresponding filled condition. The governing support or structural review should also account for the project’s specified operating cases and engineering requirements.
Can the DWG be used directly for fabrication?
The DWG is a drafting reference. Confirm its geometry and metadata against the page’s authoritative dimensional data and the applicable project documents before using it for fabrication or procurement.