This reference is designed for engineers, designers, estimators, fabricators, and installers who need to interpret the 38 inch DN950 Schedule XS pipe data shown below. Use the dimensional table for layout, fabrication, material takeoff, support review, and preliminary handling assessments.
When using this page with related PipeSTD resources, compare the pipe dimensions with the relevant pipe schedule tables, flange dimensions, butt-weld fitting references, and piping CAD or DWG resources. Those references help confirm how the straight-pipe dimensions fit into a complete piping assembly.
Schedule XS Pipe 38 Inch (DN950) is a large steel pipe size used in industrial piping systems, utility lines, water transmission projects, plant construction, and heavy fabrication work. This page provides a practical reference for the main dimensions and weight of 38 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.
38 Inch Schedule XS Pipe Dimensions
- Pipe Size: 38 Inch
- Nominal Diameter: DN950
- Pipe Schedule: XS (Extra Strong)
- Outside Diameter (OD): 965 mm
- Inside Diameter (ID): 939.6 mm
- Wall Thickness: 12.7 mm
- Pipe Weight: 298.26 kg/m
- Pipe Weight Including Water: 991.29 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XS Pipe 38 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 38″ | 950 | 965 | 939.6 | 12.7 | 298.26 |
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 large size such as 38 inch DN950 pipe, wall thickness matters even more because it has a strong effect on lifting weight, handling, structural loading, and installation planning in real projects.
Why 38 Inch DN950 Pipe Dimensions Matter
Knowing the exact dimensions of 38 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: Large pipe sections require reliable weight data for safe handling.
- Schedule Comparison: Engineers often compare XS with STD, Sch 40, Sch 60, or Sch 80 during design review.
Typical Applications of 38 Inch Schedule XS Pipe
This pipe size may be used in:
- Industrial process piping
- Water transmission systems
- Power and utility projects
- Large 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 38 inch, the actual outside diameter is 965 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 38 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 carbon steel pipe dimensions in industrial applications.
How to Use the 38 Inch XS Pipe Data
Start with the outside diameter when checking routing space, alignment, clamps, fittings, and connection geometry. Use the wall thickness and inside diameter when reviewing fabrication details, bore continuity, and the effect of the selected schedule on the pipe section.
The listed mass per unit length is useful for preliminary material takeoffs and support-load reviews. For lifting, transport, and structural checks, confirm the actual delivered pipe condition, length, coating, attachments, contents, and project requirements before finalizing the calculation.
Important Checks Before Fabrication or Installation
- Confirm that the drawing uses the same NPS, DN, schedule, and dimensional reference as the procurement documentation.
- Check whether connected flanges, fittings, valves, and reducers use compatible bore and end dimensions.
- Account for weld preparation, tolerances, coatings, linings, corrosion allowances, and field modifications where applicable.
- Use project specifications and the responsible engineer’s calculations for pressure, stress, support, lifting, and structural verification.
Related Piping References
This page can be used alongside references for pipe outside diameter and wall thickness, schedule comparisons, pipe weight calculations, flange dimensions, butt-weld fittings, and piping isometric drafting. Keeping these references together helps prevent dimensional mismatches between the pipe, fittings, connection details, and CAD deliverables.
Terminology for Drawings and Specifications
NPS identifies the nominal pipe size in inch-based usage, while DN is the corresponding nominal designation used in metric-oriented documentation. OD describes the external pipe diameter, ID describes the internal bore, and wall thickness describes the material between them. These terms should be used consistently across purchase specifications, fabrication drawings, bills of material, and inspection records.
Frequently Asked Questions
What does XS mean for this pipe?
XS means Extra Strong. It identifies the pipe wall designation and affects the wall thickness, inside diameter, mass, fabrication requirements, and support loading.
Is the 38 inch designation the actual outside diameter?
No. The inch designation is the nominal pipe size. The actual outside diameter is the dimensional value listed in the reference data and should be used for layout and connection checks.
Why are both pipe weight and pipe weight including water shown?
They represent different loading conditions. The pipe-only value supports material and handling reviews, while the water-filled value provides a reference for checks involving the pipe and its stated contents.
Can this table replace a project design check?
No. The table is a dimensional reference. Final pressure, stress, support, lifting, transport, and installation decisions require project specifications, verified materials, connected components, and review by the responsible engineering team.