This reference is intended for engineers, drafters, fabricators, estimators, and inspectors who need a quick check of 3/4 inch Schedule XS pipe data. Use the dimension list and table to coordinate piping layouts, material takeoffs, fabrication details, and the accompanying DWG resource.
Before using the listed dimensions for procurement or design release, confirm the project specification, material requirements, manufacturing tolerances, end preparation, and applicable design code. Nominal size and schedule identify the pipe designation; they do not replace project-specific engineering review.
Schedule XS Pipe 3/4 Inch (DN20) is a steel pipe size commonly used in industrial piping systems, utility lines, water transmission projects, plant construction, and fabrication work. This page provides a practical reference for the main dimensions and weight of 3/4 inch XS pipe based on ANSI/ASME B36.10.
For piping engineers, CAD designers, estimators, fabrication teams, and site supervisors, accurate pipe size data is important for layout work, material takeoff, support design, transport planning, and installation checks. This guide presents the essential dimensions in a cleaner format that adds more value than a simple size table.
3/4 Inch Schedule XS Pipe Dimensions
- Pipe Size: 3/4 Inch
- Nominal Diameter: DN20
- Pipe Schedule: XS (Extra Strong)
- Outside Diameter (OD): 26.7 mm
- Inside Diameter (ID): 18.88 mm
- Wall Thickness: 3.91 mm
- Pipe Weight: 2.2 kg/m
- Pipe Weight Including Water: 2.47 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XS Pipe 3/4 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 3/4″ | 20 | 26.7 | 18.88 | 3.91 | 2.2 |
What Does Schedule XS Mean?
Schedule XS stands for Extra Strong. It is a pipe wall designation used in steel pipe standards. The selected schedule affects the wall thickness, which directly affects the inside diameter, pipe weight, fabrication requirements, and support loading.
For a size such as 3/4 inch DN20 pipe, wall thickness remains important because it affects total pipe weight, handling requirements, support loads, and installation planning in real projects.
Why 3/4 Inch DN20 Pipe Dimensions Matter
Knowing the exact dimensions of 3/4 inch Schedule XS pipe is useful for several engineering and construction tasks:
- Fabrication: OD and wall thickness are needed for cutting, beveling, welding, and fit-up work.
- Support Design: Pipe weight per meter helps engineers check support spacing and structural loads.
- Flow Review: ID is useful for estimating internal flow area and hydraulic performance.
- Transport and Lifting: Accurate weight data supports safer handling and planning.
- Schedule Comparison: Engineers often compare XS with STD, Sch 40, Sch 60, or Sch 80 during design review.
Typical Applications of 3/4 Inch Schedule XS Pipe
This pipe size may be used in:
- Industrial process piping
- Water transmission systems
- Power and utility projects
- Plant piping works
- Infrastructure construction
- Custom steel fabrication and spool projects
Engineering Notes
NPS means Nominal Pipe Size, while DN means Diameter Nominal. Although this pipe is called 3/4 inch, the actual outside diameter is 26.7 mm according to the standard. The inside diameter changes with the pipe schedule because wall thickness changes from one schedule to another.
That means if you compare the same 3/4 inch pipe in a different schedule, the OD usually stays the same, while the ID, wall thickness, and pipe weight will change.
Reference
The dimension data on this page is based on ANSI/ASME B36.10, which is widely used for steel pipe dimensions in industrial applications.
How to Use This Pipe Reference
The table is most useful when several teams need the same dimensional basis. Outside diameter supports layout coordination, fitting selection, clamp and sleeve checks, and fabrication setup. Inside diameter is the relevant dimensional input for flow-area and hydraulic reviews. Wall thickness helps with weld preparation, fit-up, and section identification.
The listed weight per meter can support preliminary material takeoffs, handling plans, and support-load reviews. Actual project loads may also include fluid, insulation, coatings, valves, fittings, attachments, and temporary loads. Those items should be assessed separately rather than inferred from the pipe-only value.
Nominal Size, OD, and ID
NPS and DN are nominal designations, so the name of a pipe should not be treated as a direct measurement of its outside or inside diameter. For the same nominal size, changing the schedule changes the wall designation and therefore affects the available internal diameter and pipe mass. This is why schedule comparison should be made using the complete dimensional data, not the nominal size alone.
Design and Drafting Checks
- Match the pipe OD to the selected fittings, flanges, clamps, sleeves, and connection details.
- Use the wall thickness when preparing weld, bevel, fit-up, and fabrication information.
- Use the internal diameter only with the project fluid, operating conditions, roughness assumptions, and hydraulic method required by the design.
- Include connected components and contents when reviewing supports, lifting, transportation, and temporary handling.
- Confirm the material specification, corrosion allowance, temperature limits, pressure design, and inspection requirements from the project documents.
Related Pipe Reference Topics
For broader piping work, pair this page with references for pipe schedules, NPS and DN terminology, flange dimensions, butt-weld fittings, and pipe support design considerations. A related CAD and DWG download section can help users move from dimensional reference to drafting, while a schedule-comparison guide can help explain how wall thickness and weight vary across designations.
Frequently Asked Questions
What does XS mean for pipe?
XS means Extra Strong. It is a wall designation used for steel pipe and identifies a heavier-wall construction than some other designations for the same nominal pipe size.
Are NPS and DN actual measured diameters?
No. NPS and DN are nominal identifiers. The actual outside and inside dimensions should be taken from the applicable dimensional reference and the project-approved product data.
Why does the inside diameter change between pipe schedules?
For a given nominal size, the outside diameter may remain associated with the same size designation while the wall thickness changes. A thicker wall leaves less internal diameter, so the schedule must be considered during hydraulic, fabrication, and clearance reviews.
Can the listed pipe weight be used as the complete support load?
No. The pipe weight is only one part of a support-load assessment. Fluid contents, insulation, coatings, fittings, valves, attachments, and applicable operating or temporary loads may also need to be included.
Is this dimension reference enough to approve a piping design?
No. It is a dimensional reference. Final design decisions should also address material, pressure and temperature conditions, corrosion allowance, joining details, code requirements, inspection, tolerances, and project specifications.
What is the purpose of the DWG download?
The DWG resource can support drafting and layout workflows. Users should check the file against the published dimensional data and project requirements before using it for fabrication or construction documentation.