Schedule XS Pipe 26 Inch (DN650) is a reference for checking the dimensional and weight data used in design, drafting, fabrication, estimating, and field planning. Use the values below to coordinate pipe geometry with fittings, supports, layouts, material takeoffs, and handling requirements.
The page also explains how NPS, DN, outside diameter, inside diameter, wall thickness, and XS designation relate to one another. The downloadable DWG provides an additional resource for CAD users who need to incorporate this pipe size into drawings or spool documentation.
Schedule XS Pipe 26 Inch (DN650) 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 26 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.
26 Inch Schedule XS Pipe Dimensions
- Pipe Size: 26 Inch
- Nominal Diameter: DN650
- Pipe Schedule: XS (Extra Strong)
- Outside Diameter (OD): 660 mm
- Inside Diameter (ID): 634.6 mm
- Wall Thickness: 12.7 mm
- Pipe Weight: 202.74 kg/m
- Pipe Weight Including Water: 518.87 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XS Pipe 26 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 26″ | 650 | 660 | 634.6 | 12.7 | 202.74 |
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 26 inch DN650 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 26 Inch DN650 Pipe Dimensions Matter
Knowing the exact dimensions of 26 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 26 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 26 inch, the actual outside diameter is 660 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 26 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 This 26 Inch XS Pipe Reference
Start with the dimension list when you need a quick check of the nominal size, actual outside diameter, inside diameter, wall thickness, or unit weight. Use the table when comparing the same information in a compact format or transferring values into a calculation, drawing note, or material takeoff.
Dimension and layout checks
The outside diameter is the primary external envelope dimension for routing, clearances, clamps, supports, and connection coordination. The inside diameter is the more relevant reference for internal flow space. Because the schedule identifies the wall thickness, changing the schedule can change the inside diameter and pipe weight even when the nominal pipe size remains the same.
Weight and handling checks
The listed pipe weight supports preliminary estimating, lifting review, transport planning, and support-load coordination. Keep the pipe weight and the listed weight including water as separate reference values. Actual project handling may also depend on pipe length, fittings, valves, lining, coating, temporary attachments, and the selected material specification.
Using the DWG resource
The downloadable CAD file can help designers begin a layout, detail a spool, or coordinate a pipe model. Before issuing a drawing for fabrication or construction, confirm units, layer conventions, connection details, tolerances, and project-specific requirements against the applicable design documents and approved vendor information.
Related Pipe References to Add to a Design Workflow
This page works well alongside references for pipe dimensions, pipe schedules, NPS and DN terminology, pipe fittings, and pipe flanges. Those related resources can help readers move from a straight-pipe dimension check to connection selection, drawing coordination, and broader piping-system review.
Frequently Asked Questions
What does XS mean for 26 inch pipe?
XS means Extra Strong. It is a pipe wall designation associated with a defined wall thickness, which affects the inside diameter, pipe weight, fabrication work, and support loading.
Are 26 inch and DN650 the same pipe size?
They are the NPS and DN designations used for this nominal pipe size. The nominal designation should not be treated as the actual outside diameter; use the listed dimensional data for layout and fabrication checks.
Why are both inside and outside diameters provided?
The outside diameter helps with clearances, supports, clamps, and connections. The inside diameter helps with flow-area review and confirms the effect of the selected wall thickness.
Can the listed pipe weight be used for final support design?
It can provide a reference for preliminary load coordination, but final support design should account for the complete project configuration, including contents, fittings, valves, attachments, operating conditions, and applicable engineering requirements.
What should I check before using the DWG file?
Confirm the drawing units, dimensions, connection details, project conventions, and revision status before using the CAD file in an issued design or fabrication package.