This reference page is intended for engineers, piping designers, CAD users, estimators, fabricators, and procurement teams who need a quick dimensional check for NPS 26 Schedule 20 pipe. Use the data below when coordinating pipe routing, clearances, supports, material takeoffs, and drawing details.
For practical design work, distinguish between the nominal size designation and the actual pipe geometry. The nominal labels identify the pipe size category, while the listed outside diameter, inside diameter, wall thickness, and weight support more detailed layout and planning checks.
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.
How to Apply This Pipe Reference
The dimensional data on this page can support early-stage layout, drafting, estimation, and coordination. The outside diameter is the primary dimension for routing envelopes, access clearances, sleeve coordination, and interference reviews. The inside diameter is useful as a flow-area reference, but final hydraulic calculations should also consider the fluid, roughness, fittings, valves, and applicable project criteria.
The listed wall thickness identifies the Schedule 20 dimensional series for this nominal size. It should not be treated by itself as a pressure-design decision. Design verification may also require the material specification, design pressure and temperature, corrosion or erosion allowance, fabrication method, joining details, and the governing piping or structural requirements.
Weight and Support Coordination
Use the dry pipe weight for material handling, transportation, and preliminary dead-load coordination. Use the water-filled value when reviewing an operating condition that includes water inside the pipe. Actual support reactions can also depend on spacing, fittings, valves, insulation, lining, guides, anchors, test contents, and other attached components.
CAD and Drawing Workflow
The downloadable DWG can help establish the pipe envelope in CAD layouts and drafting workflows. Before issuing a drawing, confirm units, layer conventions, connection details, project tolerances, and coordination with the applicable fittings and flange references. A CAD representation is a drafting aid and does not replace dimensional verification against the project specification and approved design documents.
Related Size Comparison
For adjacent nominal-size checks, compare this page with the Schedule 20 Pipe 24 Inch (DN600) and Schedule 20 Pipe 28 Inch (DN700) references. Comparing neighboring sizes can help identify changes in routing space, support requirements, and material quantities without confusing nominal size with actual outside diameter.
Frequently Asked Questions
What is the difference between NPS 26 and DN650?
NPS 26 is the inch-based nominal pipe size designation, while DN650 is the metric nominal reference for the same pipe size category. Neither label should be used as a substitute for checking the listed outside diameter.
What does Schedule 20 identify?
Schedule 20 identifies a wall-thickness series for the nominal pipe size. The schedule affects the listed wall thickness, inside diameter, weight, and coordination with fittings and supports.
Which diameter should be used for layout?
Use the outside diameter when checking routing space, clearances, penetrations, and interference. Use the inside diameter for flow-related reference checks, subject to the requirements of the final hydraulic design.
Why is the water-filled weight important?
The water-filled value represents a heavier operating or testing condition than the empty pipe condition. It can support preliminary reviews of support loads, lifting, transportation, and structural coordination; final reactions require a complete system assessment.
Can this data be used for pressure design?
The dimensional reference alone is not sufficient for pressure design. Confirm the material, design conditions, allowances, fabrication details, joining method, and governing project requirements before approving the pipe for service.
Is a CAD file available for this pipe size?
Yes. The page includes a DWG download for Schedule 20 Pipe 26 Inch (DN650). Review the file units and drawing conventions before incorporating it into a project model or issued drawing.