This reference page brings together the key dimensional and weight data for 22 inch Schedule 20 pipe, also identified as NPS 22 and DN550. Use it as a quick source during piping layout, CAD drafting, material takeoff, fabrication coordination, and preliminary load review.
The table values should be read together: outside diameter supports layout and clearance checks, inside diameter provides a dimensional flow reference, wall thickness identifies the schedule, and weight supports handling and support-load discussions. The accompanying DWG resource can also help users coordinate the pipe size in drafting workflows.
Schedule 20 pipe 22 inch (DN550) is a large-diameter steel pipe size commonly used in piping design, drafting, fabrication, estimation, and plant layout work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 22 Schedule 20 pipe based on ASME B36.10.
For engineers, designers, estimators, and CAD users, quick access to accurate pipe data helps improve piping layout, support planning, weight checks, and fabrication coordination during project development.
22 Inch Schedule 20 Pipe Dimensions
- Nominal Pipe Size (NPS): 22 inch
- Diameter Nominal (DN): DN550
- Outside Diameter (OD): 559 mm
- Wall Thickness: 9.53 mm
- Inside Diameter (ID): 539.94 mm
- Pipe Weight: 129.14 kg/m
- Pipe Weight Including Water: 357.99 kg/m
- Standard: ASME B36.10
Schedule 20 Pipe 22 Inch Data Table
| NPS | DN | Outside Diameter (OD) | Wall Thickness | Inside Diameter (ID) | Weight |
|---|---|---|---|---|---|
| 22 inch | DN550 | 559 mm | 9.53 mm | 539.94 mm | 129.14 kg/m |
Understanding 22 Inch Schedule 20 Pipe
22 inch Schedule 20 pipe is a standard steel pipe size used as a reference in utility systems, water lines, industrial piping layouts, process design studies, and CAD drafting. With an outside diameter of 559 mm and a wall thickness of 9.53 mm, this pipe size is useful where large flow capacity is needed while keeping the wall lighter than heavier schedules.
What Does Schedule 20 Mean?
Schedule 20 refers to the wall thickness series of the pipe. For NPS 22, Schedule 20 gives a wall thickness of 9.53 mm. The schedule affects the inside diameter, total weight, fabrication requirements, and dimensional coordination with fittings, supports, and layout clearances.
Why These Pipe Dimensions Matter
Accurate pipe dimension data is important for piping layouts, spool drawings, support design, structural load review, and material takeoff. Knowing that this pipe weighs 129.14 kg/m helps with transport estimates, lifting plans, and support loading. If the pipe is filled with water, the total weight increases to 357.99 kg/m, which is also useful for operating load calculations.
Common Uses of DN550 Schedule 20 Pipe
DN550 Schedule 20 pipe may be referenced in industrial utility systems, water transfer lines, plant layout studies, process piping documentation, and engineering design work. It is also commonly used by piping designers, CAD users, estimators, and procurement teams who need fast access to standard steel pipe dimensions.
Difference Between NPS 22 and DN550
NPS 22 is the inch-based nominal pipe size designation, while DN550 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 559 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 22 Inch
- Pipe Size: 22 inch
- DN: DN550
- OD: 559 mm
- ID: 539.94 mm
- Wall Thickness: 9.53 mm
- Weight: 129.14 kg/m
- Weight Including Water: 357.99 kg/m
- Reference Standard: ASME B36.10
Related Pipe Size Pages
Conclusion
Schedule 20 Pipe 22 Inch (DN550) is an important large-diameter steel pipe reference for piping design, drafting, estimation, and fabrication work. With its 559 mm outside diameter, 9.53 mm wall thickness, and 129.14 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 Read This Pipe Reference
Pipe size terminology can be confusing because NPS 22 and DN550 are nominal designations rather than direct descriptions of the measured outside diameter. For layout work, use the listed outside diameter. For dimensional checks inside the pipe, use the listed inside diameter, while recognizing that fittings, joints, linings, and fabrication details may require separate reference data.
Schedule, Weight, and Design Context
The schedule identifies the wall-thickness series for this pipe size. Wall thickness affects the available internal diameter and contributes to the listed pipe weight. The dry pipe weight and the water-filled weight serve different estimating purposes: the first supports handling and material calculations, while the second provides a reference for reviewing a filled-line condition.
These dimensional values do not by themselves establish whether a pipe is acceptable for a particular service. Project review may also require the specified material, design pressure and temperature, corrosion or erosion allowances, joint details, fluid properties, insulation, valves, fittings, supports, and applicable design rules. Confirm those project requirements before using the data for procurement, pressure design, or final structural verification.
Using the DWG in a Drafting Workflow
The downloadable DWG is useful as a starting reference for CAD layouts and coordination drawings. Before issuing a drawing, confirm the selected layer, units, centerline or end-condition assumptions, connection details, and compatibility with the project’s fitting and flange references. A dimensional pipe model should not be treated as a complete fabrication or construction detail without the associated project information.
Checks to Make Before Ordering or Installing
- Confirm that the required nominal size and schedule match the piping specification.
- Check the specified material and manufacturing requirements separately from the dimensional reference.
- Coordinate the pipe outside diameter with supports, clamps, insulation, penetrations, and adjacent equipment.
- Use the listed weight condition that matches the estimate being prepared, and include other attached components when required.
- Verify fitting, flange, gasket, and valve dimensions against their applicable references before finalizing a connection.
Frequently Asked Questions
What is the outside diameter of 22 inch Schedule 20 pipe?
The listed outside diameter for NPS 22 Schedule 20 pipe is 559 mm. Use this value for preliminary layout, clearance, and support coordination.
What are NPS 22 and DN550?
NPS 22 is the inch-based nominal pipe size designation, while DN550 is the metric nominal reference for the same pipe size category.
What does Schedule 20 indicate?
Schedule 20 identifies the wall-thickness series for this nominal pipe size. The listed wall thickness for this page is 9.53 mm.
What is the listed weight of this pipe?
The listed pipe weight is 129.14 kg/m. The page also provides a water-filled reference weight of 357.99 kg/m. Actual installed loads may include fittings, valves, insulation, supports, contents other than water, and other attached items.
Can this page be used for final pipe design?
It is a dimensional and weight reference, not a complete design approval. Final selection should be checked against the project specification, material requirements, service conditions, applicable design rules, and engineering review.
Is a CAD file available for this pipe size?
Yes. A DWG reference is provided with the page. Review its units, geometry, and project coordination requirements before incorporating it into an issued drawing.