This reference is intended for engineers, designers, estimators, fabricators, and inspectors who need a quick check of 16 inch Schedule XS pipe dimensions. Use the listed outside diameter, inside diameter, wall thickness, and weight when coordinating piping layouts, material takeoffs, spool drawings, supports, lifting plans, and installation checks.
The table is a dimensional reference, not a substitute for project specifications or engineering verification. Confirm the applicable material, manufacturing, joining, corrosion, pressure, temperature, and loading requirements before using the pipe in a design.
Schedule XS Pipe 16 Inch (DN400) 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 16 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.
16 Inch Schedule XS Pipe Dimensions
- Pipe Size: 16 Inch
- Nominal Diameter: DN400
- Pipe Schedule: XS (Extra Strong)
- Outside Diameter (OD): 406.4 mm
- Inside Diameter (ID): 381 mm
- Wall Thickness: 12.7 mm
- Pipe Weight: 123.31 kg/m
- Pipe Weight Including Water: 237.26 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XS Pipe 16 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 16″ | 400 | 406.4 | 381 | 12.7 | 123.31 |
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 16 inch DN400 pipe, wall thickness remains important because it affects total pipe weight, handling requirements, support loads, and installation planning in real projects.
Why 16 Inch DN400 Pipe Dimensions Matter
Knowing the exact dimensions of 16 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 16 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 16 inch, the actual outside diameter is 406.4 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 16 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 16 Inch XS Pipe Reference
The outside diameter is the primary envelope dimension for layout coordination, clamps, sleeves, supports, and connection details. The inside diameter is the useful bore dimension for flow-area reviews and clearances. The listed wall thickness helps fabrication teams plan beveling, welding, fit-up, and inspection work.
Use the published pipe weight per meter for preliminary material takeoffs, handling discussions, support-load reviews, and transport planning. Where the line is intended to carry water, the water-included weight shown in the source data provides a separate planning reference. Final support and lifting decisions should also account for fittings, valves, flanges, insulation, contents, testing conditions, and project-specific load combinations.
Related Pipe References to Review
For a complete piping check, compare this page with related PipeSTD references for pipe schedules, NPS and DN terminology, steel pipe dimensions, pipe fittings, flanges, pipe support design, and DWG pipe details. Comparing the same nominal size across schedules is especially useful during routing, procurement, and design review because the outside diameter may remain coordinated while the bore, wall, and weight vary.
Design and Drafting Checklist
- Confirm that the drawing identifies both the nominal size and the XS schedule.
- Use the outside diameter when checking physical clearances and connection geometry.
- Use the inside diameter when reviewing bore, flow, and internal access requirements.
- Use the wall thickness when preparing fabrication and welding details.
- Check whether the pipe weight is being considered alone or together with contents and attached components.
- Verify the project specification and applicable material requirements before procurement.
Frequently Asked Questions
What is the outside diameter of 16 inch Schedule XS pipe?
The source data lists the outside diameter as 406.4 mm. This is the outside envelope used for layout and coordination.
What does XS mean in pipe sizing?
XS means Extra Strong. It identifies a pipe wall designation; the schedule affects wall thickness, inside diameter, weight, and fabrication considerations.
Is 16 inch pipe the same as DN400?
In this reference, 16 inch is the NPS designation and DN400 is the corresponding nominal metric designation. The nominal name should not be treated as the actual measured outside diameter.
Why is the inside diameter important?
The inside diameter indicates the available bore. It supports preliminary flow-area, clearance, and internal-access reviews, while final hydraulic and process checks require the applicable project conditions.
Can this page be used to select a pressure-rated pipe?
Not by itself. Dimensions and schedule identify the pipe geometry, but pressure suitability also depends on project specifications, material, temperature, design rules, manufacturing requirements, and engineering verification.
What other information should be checked before ordering?
Confirm the required material specification, length, end preparation, manufacturing and inspection requirements, coating or lining needs, and documentation requirements with the project and purchase specification.