This reference brings together the key dimensional and weight information for 3/4 inch Schedule 5 pipe, also identified as DN20. Use the table and supporting explanation when checking piping layouts, material takeoffs, fabrication drawings, support coordination, or procurement documents.
Because nominal pipe size and schedule are not interchangeable terms, confirm both the nominal designation and the listed outside diameter before selecting fittings, clamps, supports, or connection details. For design work, compare this reference with the applicable project specification, material requirements, joining method, and engineering calculations.
Schedule 5 Pipe 3/4 Inch (DN20) is a steel pipe size commonly used in industrial piping systems that require good flow capacity with a relatively light wall thickness. This pipe size is often used in utility piping, water systems, low-pressure industrial service, and general steel pipe fabrication work.
This dimension data is based on ANSI/ASME B36.10, which is the standard commonly used for carbon steel pipe dimensions.
3/4 Inch Schedule 5 Pipe Dimensions
- Pipe Schedule: 5
- Nominal Pipe Size: 3/4 Inch
- DN Size: DN20
- Outside Diameter (OD): 26.7 mm
- Inside Diameter (ID): 23.4 mm
- Wall Thickness: 1.65 mm
- Pipe Weight: 1.03 kg/m
- Pipe Weight Including Water: 1.45 kg/m
- Standard: ANSI/ASME B36.10
Schedule 5 Pipe 3/4 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 5 | 3/4 | 20 | 26.7 | 23.4 | 1.65 | 1.03 |
What Is 3/4 Inch Schedule 5 Pipe?
A 3/4 inch Schedule 5 pipe is a steel pipe with a nominal size of 3/4 inch and a relatively thin wall thickness compared with heavier schedules. For this size, the outside diameter is fixed at 26.7 mm, while the inside diameter is 23.4 mm based on a wall thickness of 1.65 mm.
Schedule 5 pipe is often selected when a project needs good flow capacity, reduced pipe weight, and easier handling compared with thicker wall pipes. It is commonly referenced in steel piping design, drafting, fabrication, and material takeoff work.
Where Is Schedule 5 Pipe 3/4 Inch Used?
This pipe size is commonly used in applications that need good flow capacity with relatively light wall thickness. Typical uses include:
- Water transfer and distribution systems
- Utility and low-pressure industrial piping
- Process and service lines
- Pipe spool fabrication and layout work
- General steel piping projects
Why Pipe Dimensions Matter
Accurate 3/4 inch Schedule 5 pipe dimensions are important for piping layout, fabrication, transport planning, support design, and installation work. Engineers and designers often check OD, ID, wall thickness, and weight before selecting supports, fittings, welding details, and handling methods.
The outside diameter is important for matching supports, clamps, and pipe accessories. The inside diameter helps estimate internal flow area and system capacity. The wall thickness affects mechanical strength and specification compliance, while the pipe weight per meter is useful for lifting plans, transport, and structural loading calculations.
3/4 Inch Schedule 5 Pipe Weight Information
The nominal weight of this pipe size is 1.03 kg/m. When filled with water, the combined weight becomes approximately 1.45 kg/m. This information is useful for pipe support design, structural coordination, and lifting preparation in piping systems.
Difference Between NPS 3/4 and DN20
NPS 3/4 is the inch-based nominal pipe size, while DN20 is the metric designation used in international drawings and specifications. Both terms refer to the same nominal pipe size, and users may search by either inch size or DN format depending on project standards.
Common Search Terms for This Pipe Size
Users may also search for this pipe using related keywords such as 3/4 inch Schedule 5 pipe dimensions, DN20 Schedule 5 pipe dimensions, 3/4 inch pipe weight per meter, DN20 pipe dimensions, or DN20 sch 5 pipe dimensions.
Conclusion
Schedule 5 Pipe 3/4 Inch (DN20) has an outside diameter of 26.7 mm, an inside diameter of 23.4 mm, a wall thickness of 1.65 mm, and a weight of 1.03 kg/m. It is a useful steel pipe reference size for design, drafting, fabrication, and procurement work.
This page provides a quick reference for engineers, drafters, fabricators, and buyers who need reliable 3/4 inch Schedule 5 pipe dimensions and DN20 pipe dimensions in one place.
How to Read This Pipe Reference
The source data separates the pipe designation from its physical dimensions. NPS 3/4 and DN20 identify the nominal size, while the outside diameter remains the key dimension for coordinating external components. The inside diameter and wall thickness describe the available internal passage and pipe wall, and the listed mass values support handling and coordination checks.
A schedule designation should not be treated as a complete pressure-rating statement. Final use requires review of the pipe material, temperature, joining details, applicable design code, corrosion allowance, manufacturing requirements, and project specifications. This page is therefore a dimensional reference, not a substitute for an engineered piping-system design.
Drafting and Procurement Checks
- Use the nominal designation when searching catalogs, specifications, and piping classes.
- Use the outside diameter when coordinating clamps, supports, sleeves, insulation interfaces, and other external accessories.
- Use the inside diameter for preliminary flow-area checks, while recognizing that final hydraulic calculations may require additional system information.
- Use the listed mass values for preliminary material takeoffs, handling coordination, and support-load discussions.
- Check the downloadable DWG against the dimensional table before incorporating it into a project drawing.
Readers comparing alternatives may also benefit from related PipeSTD references on pipe schedules, NPS and DN designations, pipe weight calculations, pipe fittings, and flange dimensions. These are natural internal-link targets for users moving from a single-size lookup to broader piping design or drafting work.
Frequently Asked Questions
What are the listed dimensions for 3/4 inch Schedule 5 pipe?
The source table lists an outside diameter of 26.7 mm, an inside diameter of 23.4 mm, and a wall thickness of 1.65 mm.
Is 3/4 inch pipe the same nominal size as DN20?
Yes. In this reference, NPS 3/4 and DN20 identify the same nominal pipe size. The two designations may appear in different drawings, catalogs, or project specifications.
What is the listed weight of this pipe?
The listed pipe weight is 1.03 kg/m. The source also lists a combined pipe-and-water weight of 1.45 kg/m.
Which standard is identified for these dimensions?
The source identifies ANSI/ASME B36.10 as the dimensional reference for this carbon steel pipe data. Always confirm the project specification and required standard before ordering.
Can the downloadable DWG be used directly for fabrication?
The DWG is a useful drafting reference, but it should be checked against the project drawings, piping specification, connection details, tolerances, and the dimensional data on this page before fabrication or issue for construction.