Need a compact reference for 1/4 inch DN8 Schedule XS pipe? This page brings the key dimensional data, terminology, and practical drafting considerations together for engineers, fabricators, estimators, and CAD users.
Use the dimensional list and table below when checking a small-bore piping layout, preparing a material takeoff, reviewing a spool drawing, or comparing pipe schedules. The accompanying DWG resource can also support drafting workflows, but project documents should always be checked against the specified material, manufacturing requirements, and applicable project standards.
Schedule XS Pipe 1/4 Inch (DN8) is a small steel pipe size commonly used in industrial piping systems, instrument connections, utility lines, plant construction, and fabrication work. This page provides a practical reference for the main dimensions and weight of 1/4 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.
1/4 Inch Schedule XS Pipe Dimensions
- Pipe Size: 1/4 Inch
- Nominal Diameter: DN8
- Pipe Schedule: XS (Extra Strong)
- Outside Diameter (OD): 13.7 mm
- Inside Diameter (ID): 7.66 mm
- Wall Thickness: 3.02 mm
- Pipe Weight: 0.8 kg/m
- Pipe Weight Including Water: 0.84 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XS Pipe 1/4 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1/4″ | 8 | 13.7 | 7.66 | 3.02 | 0.8 |
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 1/4 inch DN8 pipe, wall thickness remains important because it affects total pipe weight, handling requirements, support loads, and installation planning in real projects.
Why 1/4 Inch DN8 Pipe Dimensions Matter
Knowing the exact dimensions of 1/4 inch Schedule XS pipe is useful for several engineering and construction tasks:
- Fabrication: OD and wall thickness are needed for cutting, threading, welding, and fit-up work.
- Support Design: Pipe weight per meter helps engineers check support and routing details.
- Flow Review: ID is useful for estimating internal flow area and hydraulic performance.
- Installation Planning: Accurate size data helps avoid mismatch during assembly.
- Schedule Comparison: Engineers often compare XS with STD, Sch 40, or Sch 80 during design review.
Typical Applications of 1/4 Inch Schedule XS Pipe
This pipe size may be used in:
- Instrument air and utility connections
- Small-bore industrial piping
- Plant piping works
- Fabrication and maintenance jobs
- Process connections
- Custom steel spool projects
Engineering Notes
NPS means Nominal Pipe Size, while DN means Diameter Nominal. Although this pipe is called 1/4 inch, the actual outside diameter is 13.7 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 1/4 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 listed outside diameter (OD) is the primary envelope dimension for routing, clamps, sleeves, clearances, and connection coordination. The inside diameter (ID) is more relevant to internal flow review, bore compatibility, and the selection of fittings or components that connect to the pipe.
Wall thickness helps distinguish this XS configuration from other schedule options for the same nominal pipe size. It also affects the pipe’s mass and the available internal bore. When comparing schedules, do not assume that a change in schedule changes the nominal size or outside diameter; confirm the applicable dimensional data for the selected configuration.
Drafting and Engineering Checks
- Confirm that the drawing uses the intended NPS and DN designations rather than treating the nominal size as a measured outside diameter.
- Use OD when coordinating physical clearances, supports, clamps, sleeves, and fabrication details.
- Use ID and wall thickness when reviewing bore continuity, fittings, instrument connections, and internal flow assumptions.
- Use the listed pipe weight for preliminary takeoffs and routing reviews, then coordinate support and structural checks with the responsible engineer.
- Check the pipe end preparation, connection type, material specification, corrosion allowance, and design requirements separately; dimensions alone do not establish pressure or service suitability.
Related Pipe Reference Topics
For a broader piping workflow, link this reference with related pages covering pipe schedules, NPS and DN terminology, pipe fittings, flanges, and pipe support design. A schedule comparison page is especially useful when reviewing whether XS, STD, Sch 40, or Sch 80 is called for by a project specification.
The downloadable DWG is useful for CAD coordination and preliminary layout work. Before issuing a fabrication drawing, verify units, layer conventions, connection details, and the project’s approved dimensional source.
Frequently Asked Questions
What does 1/4 inch DN8 mean?
1/4 inch is the NPS designation, while DN8 is the corresponding nominal metric designation. Neither designation should be interpreted as the measured outside diameter.
What does XS mean in pipe dimensions?
XS means Extra Strong. It identifies a pipe wall designation and affects the wall thickness, internal bore, and weight shown in the reference data.
Does the outside diameter change when the schedule changes?
For the same nominal pipe size, the outside diameter generally remains the controlling size while wall thickness and inside diameter vary by schedule. Always confirm the selected schedule in the applicable dimensional reference.
Can this page be used for pressure-design approval?
No. The dimensional data supports layout, fabrication, estimating, and coordination checks, but pressure and service suitability require review of the material, design conditions, joining method, corrosion allowance, and applicable project requirements.
What is the DWG file useful for?
The DWG can assist with CAD layout, spool planning, and dimensional coordination. It should be reviewed for units and project drafting requirements before being used in an issued design.