Schedule 20 pipe 26 inch (DN650) is a large-diameter steel pipe size commonly used in piping design, drafting, fabrication, estimation, and industrial layout work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 26 Schedule 20 pipe based on ASME B36.10.
For engineers, draftsmen, estimators, and piping professionals, quick access to accurate pipe data helps improve material selection, piping layout, support planning, weight checks, and fabrication coordination during project development.
26 Inch Schedule 20 Pipe Dimensions
- Nominal Pipe Size (NPS): 26 inch
- Diameter Nominal (DN): DN650
- Outside Diameter (OD): 660 mm
- Wall Thickness: 12.7 mm
- Inside Diameter (ID): 634.6 mm
- Pipe Weight: 202.74 kg/m
- Pipe Weight Including Water: 518.87 kg/m
- Standard: ASME B36.10
Schedule 20 Pipe 26 Inch Data Table
| NPS | DN | Outside Diameter (OD) | Wall Thickness | Inside Diameter (ID) | Weight |
|---|---|---|---|---|---|
| 26 inch | DN650 | 660 mm | 12.7 mm | 634.6 mm | 202.74 kg/m |
Understanding 26 Inch Schedule 20 Pipe
26 inch Schedule 20 pipe is a standard steel pipe size used as a reference in plant design, utility routing, water systems, process piping, and CAD drafting. With an outside diameter of 660 mm and a wall thickness of 12.7 mm, this pipe size is suitable for projects that require large flow capacity while keeping the wall thinner than heavier schedules.
What Does Schedule 20 Mean?
Schedule 20 refers to the wall thickness series of the pipe. For NPS 26, Schedule 20 gives a wall thickness of 12.7 mm. The schedule affects the inside diameter, pipe weight, fabrication requirements, and dimensional coordination with fittings, supports, and layout clearances.
Why These Pipe Dimensions Matter
Accurate pipe dimensions are important in engineering work because they are used in piping layouts, support design, spool drawings, structural load checks, and material takeoff. Knowing that this pipe weighs 202.74 kg/m helps with transportation estimates, lifting plans, and support loading. If the pipe is filled with water, the weight increases to 518.87 kg/m, which is useful for operating load calculations.
Common Uses of DN650 Schedule 20 Pipe
DN650 Schedule 20 pipe may be used in industrial utility systems, water transmission lines, plant design references, process piping studies, and engineering documentation. It is also commonly referenced by piping designers, CAD users, fabricators, and procurement teams who need fast access to standard steel pipe dimensions.
Difference Between NPS 26 and DN650
NPS 26 is the inch-based nominal pipe size designation, while DN650 is the metric nominal diameter reference. Both refer to the same pipe size category on this page. The actual standard outside diameter for this size is 660 mm.
How to Use This Data
You can use this page to quickly check:
- pipe outside diameter for layout and clearance
- inside diameter for flow reference
- wall thickness for schedule comparison
- weight per meter for estimation and transport planning
- water-filled weight for support and structural load review
Quick Reference for Schedule 20 Pipe 26 Inch
- Pipe Size: 26 inch
- DN: DN650
- OD: 660 mm
- ID: 634.6 mm
- Wall Thickness: 12.7 mm
- Weight: 202.74 kg/m
- Weight Including Water: 518.87 kg/m
- Reference Standard: ASME B36.10
Related Pipe Size Pages
Conclusion
Schedule 20 Pipe 26 Inch (DN650) is an important large-diameter steel pipe reference for piping design, drafting, estimation, and fabrication work. With its 660 mm outside diameter, 12.7 mm wall thickness, and 202.74 kg/m pipe weight, it provides useful dimensional data for engineers and designers who need fast and accurate pipe information.
Note: NPS = Nominal Pipe Size, DN = Diameter Nominal. Dimensions and weights shown here are based on ASME B36.10 steel pipe data.