This reference page provides a practical lookup for Schedule 120 pipe 22 inch, also identified as NPS 22 and DN550. Use the dimensional data when checking piping layouts, preparing fabrication documents, reviewing material takeoffs, or comparing pipe mass for handling and support studies.
For accurate interpretation, distinguish the nominal pipe size from the measured outside diameter. The schedule identifies a wall-thickness series, while the table supplies the corresponding inside diameter and mass for this steel pipe size. Pair this page with related pipe schedule references, pipe dimension tables, flange references, and piping terminology guides when developing a complete design reference set.
Schedule 120 pipe 22 inch (DN550) is a heavy-wall steel pipe size commonly used in piping design, fabrication, drafting, and engineering estimation work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 22 Schedule 120 pipe based on ASME B36.10.
22 Inch Schedule 120 Pipe Dimensions
- Nominal Pipe Size (NPS): 22 inch
- Diameter Nominal (DN): DN550
- Outside Diameter (OD): 559 mm
- Wall Thickness: 41.28 mm
- Inside Diameter (ID): 476.44 mm
- Pipe Weight: 527.05 kg/m
- Pipe Weight Filled With Water: 705.24 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 120 Pipe 22 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 22 inch | 550 | 559 | 41.28 | 476.44 | 527.05 |
What Does Schedule 120 Mean?
Schedule 120 refers to a heavy wall thickness series used for steel pipe under ASME B36.10. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness increases according to the schedule. A thicker wall reduces the inside diameter and significantly increases pipe weight.
Typical Uses of 22 Inch Schedule 120 Pipe
NPS 22 Schedule 120 pipe is commonly referenced for heavy-duty industrial piping systems where high wall thickness is required. It may be used in process piping, plant utility systems, structural loading checks, fabrication work, and engineering applications where pipe strength and wall thickness are more critical than maximum flow area.
Why Pipe Weight Matters
Pipe weight per meter is essential for transport planning, crane lifting studies, support design, structural loading, fabrication estimates, and installation planning. For a 22 inch Schedule 120 pipe, the heavy wall thickness results in much higher installed weight than lighter schedules, so accurate weight data is important for engineering and construction work.
22 Inch Schedule 120 Pipe Calculation Notes
The listed weight is based on standard steel pipe dimensions using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material specification, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 22 inch Schedule 120 pipe?
The outside diameter is 559 mm.
What is the wall thickness of DN550 Schedule 120 pipe?
The wall thickness is 41.28 mm.
What is the inside diameter of NPS 22 Schedule 120 pipe?
The inside diameter is 476.44 mm.
How much does 22 inch Schedule 120 pipe weigh?
The approximate weight is 527.05 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 120 pipe 22 inch (DN550) has an outside diameter of 559 mm, wall thickness of 41.28 mm, inside diameter of 476.44 mm, and a weight of 527.05 kg/m. It is a useful reference for piping design, fabrication, estimating, and heavy-duty industrial engineering work.
How to Read This 22 Inch Schedule 120 Pipe Reference
The listed dimensions describe one standardized pipe size rather than a general dimensional range. NPS 22 is the nominal designation used in inch-based piping references, while DN550 is the metric designation. Neither designation should be treated as the pipe’s actual measured bore or outside diameter; those values are provided separately in the source table.
Nominal size, outside diameter, and inside diameter
The outside diameter is the fixed dimensional basis for this nominal size in the referenced series. Schedule 120 then identifies the applicable heavy-wall construction, and the wall thickness determines how much of the cross-section remains as the internal opening. This is why outside diameter and inside diameter must be checked separately when reviewing clearances, flow-area assumptions, or connection details.
Using the weight data in engineering work
The tabulated mass per meter is useful for material estimates and for preliminary checks involving pipe supports, lifting, transportation, storage, and installation. The water-filled value is a separate condition that accounts for the pipe containing water; it should not be confused with the empty-pipe value. Final support, lifting, and structural decisions still require the project material specification, actual product information, connected components, contents, insulation, and applicable design checks.
Design and drafting cross-checks
Before using the dimensions in a model or drawing, confirm that the selected pipe designation agrees with the project line class, connection details, valve and fitting dimensions, and required clearances. For drafting workflows, the accompanying DWG resource can support layout work, but the drawing should be checked against the governing project documents and supplier information before fabrication.
Useful related internal references include pipe schedule comparisons, steel pipe weight references, pipe fittings and flange dimensions, pipe support design guidance, and ASME B36.10 terminology. These topics help readers move from a dimensional lookup to a coordinated piping review without treating the table as a substitute for project engineering.
Additional Questions About Schedule 120 Pipe 22 Inch
Is 22 inch pipe the same as DN550 pipe?
In this reference, 22 inch and DN550 identify the same nominal pipe size. The nominal designation is separate from the actual outside and inside diameters listed in the dimensional data.
Does Schedule 120 describe the pipe material?
No. Schedule 120 describes the pipe wall-thickness series used with the referenced steel pipe dimensions. Material grade, manufacturing specification, corrosion allowance, and testing requirements must be confirmed from the project specification and product documentation.
Can the listed pipe weight be used for support design?
It can serve as a reference input for preliminary planning, but support design requires consideration of the complete installed condition. Contents, fittings, valves, insulation, operating conditions, support spacing, and applicable structural requirements may affect the final result.
Why can supplier weight differ from the tabulated value?
Minor differences may result from manufacturing tolerances, material specification, product form, and supplier calculation or measurement practices. Confirm the purchased product data before using weight information for procurement, lifting, or final engineering checks.
What should be checked before using the DWG file?
Check the drawing against the dimensional table, project units, connection requirements, revision control, and the selected manufacturer or fabricator information. A reference drawing is useful for drafting coordination, but it does not replace project-specific verification.