Use this page as a quick reference when checking 6 inch Schedule XS pipe for piping layout, fabrication, estimating, and drafting. The table below brings the nominal size, outside diameter, inside diameter, wall thickness, and weight into one place, while the notes explain how those values are used in practice.
For related work, compare this reference with your project’s pipe schedule, steel pipe dimensions, pipe fittings, and flange references before preparing a model, material takeoff, or fabrication drawing.
Schedule XS Pipe 6 Inch (DN150) 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 6 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.
6 Inch Schedule XS Pipe Dimensions
- Pipe Size: 6 Inch
- Nominal Diameter: DN150
- Pipe Schedule: XS (Extra Strong)
- Outside Diameter (OD): 168.3 mm
- Inside Diameter (ID): 146.36 mm
- Wall Thickness: 10.97 mm
- Pipe Weight: 42.56 kg/m
- Pipe Weight Including Water: 59.37 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XS Pipe 6 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 6″ | 150 | 168.3 | 146.36 | 10.97 | 42.56 |
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 6 inch DN150 pipe, wall thickness remains important because it affects total pipe weight, handling requirements, support loads, and installation planning in real projects.
Why 6 Inch DN150 Pipe Dimensions Matter
Knowing the exact dimensions of 6 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 6 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 6 inch, the actual outside diameter is 168.3 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 6 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 6 Inch XS Pipe Reference
Start with the outside diameter when checking space in a pipe rack, sleeve, clamp, support, or fitting connection. Use the inside diameter when reviewing the available flow passage or checking compatibility with an adjoining component. Wall thickness is especially important for fabrication, weld preparation, machining, and dimensional inspection.
The listed mass values serve different planning purposes. The pipe-only value supports material takeoffs, lifting reviews, and support-load estimates. The value that includes water is useful when considering an operating or filled condition. These figures should be coordinated with the actual pipe length, contents, fittings, valves, insulation, supports, and other attached items in a project calculation.
Schedule, Nominal Size, and Design Verification
NPS 6 and DN150 identify the nominal pipe size; they should not be treated as a direct statement of the measured outside or inside diameter. The XS designation identifies the selected wall category. It does not, by itself, establish a complete pressure, temperature, material, corrosion, or structural design basis.
Before releasing a drawing or purchase request, confirm the required material specification, manufacturing requirements, end preparation, dimensional tolerances, joining method, and applicable project design rules. The dimensional reference on this page should be coordinated with the applicable fitting and flange dimensions rather than used as a substitute for those component references.
Drafting and CAD Workflow
For a CAD or DWG layout, use the outside diameter for the external envelope and the inside diameter for the internal passage. Keep the nominal designation and schedule visible in the drawing metadata or bill of materials so the selected section is not confused with another 6 inch schedule. The downloadable DWG can support drafting workflows, but project users should still check units, layer conventions, connection details, and the final model against approved project documents.
Useful related internal references include pipe dimension tables, pipe schedule comparisons, steel pipe fittings, pipe flange dimensions, and CAD/DWG piping resources.
Practical Review Checklist
- Confirm that the nominal designation and XS schedule match the material request.
- Check outside diameter and wall thickness against the connected fitting or flange reference.
- Use the appropriate weight basis for empty, filled, lifting, and support reviews.
- Verify the selected material, joining details, and project design requirements separately.
- Check the DWG or model units before using geometry for fabrication or coordination.
Frequently Asked Questions
Is 6 inch pipe the same as DN150 pipe?
These are corresponding nominal designations for the same pipe size reference. The nominal name is not the same as a direct measured diameter, so dimensional checks should use the listed OD, ID, and wall thickness.
Does XS describe the pipe material?
No. XS describes the pipe wall category. The material grade or specification must be identified separately in the project documents and purchase requirements.
Does the schedule determine pressure capacity?
Not by itself. Pressure capacity depends on the material, design temperature, manufacturing requirements, corrosion allowance, joining details, and the governing design rules. An engineer should verify the complete design basis.
Why are both pipe-only and water-filled weights shown?
They support different planning checks. Pipe-only weight is useful for material and handling estimates, while the water-included value helps with filled-condition load reviews. Actual system loads may also include fittings, valves, insulation, supports, and other contents.
Can the DWG be used directly for fabrication?
The DWG is a drafting reference, not a replacement for an approved fabrication drawing. Confirm units, tolerances, end details, connections, material requirements, and project revisions before fabrication.
Additional Questions About 6 Inch XS Pipe
What should be checked when connecting this pipe to a fitting?
Check the pipe outside diameter, wall thickness, end preparation, and the fitting’s dimensional reference. The connection should also satisfy the applicable joining and project requirements.
Why can two 6 inch pipes have different inside diameters?
The nominal size can remain the same while the selected schedule changes the wall thickness. That change affects the remaining internal passage and the pipe weight.
Is the listed weight enough for a support design?
It is a useful pipe-load input, but a support review should also consider contents, fittings, valves, insulation, support hardware, operating conditions, and the project’s structural criteria.