This reference page helps engineers, drafters, fabricators, and estimators interpret the dimensional data for 20 inch Schedule 160 pipe. It brings together the nominal size designation, DN equivalent, outside diameter, wall thickness, inside diameter, pipe weight, and downloadable DWG reference in one location.
Use the dimensional table for drafting and preliminary quantity work, then confirm the material specification, manufacturing tolerances, end details, and project design requirements before procurement or final engineering approval.
Schedule 160 pipe 20 inch (DN500) is an extra 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 20 Schedule 160 pipe based on ASME B36.10.
20 Inch Schedule 160 Pipe Dimensions
- Nominal Pipe Size (NPS): 20 inch
- Diameter Nominal (DN): DN500
- Outside Diameter (OD): 508 mm
- Wall Thickness: 50.01 mm
- Inside Diameter (ID): 407.98 mm
- Pipe Weight: 564.85 kg/m
- Pipe Weight Filled With Water: 695.51 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 160 Pipe 20 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 20 inch | 500 | 508 | 50.01 | 407.98 | 564.85 |
What Does Schedule 160 Mean?
Schedule 160 refers to an extra 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 much thicker wall reduces the inside diameter and significantly increases pipe weight.
Typical Uses of 20 Inch Schedule 160 Pipe
NPS 20 Schedule 160 pipe is commonly referenced for very heavy-duty industrial piping systems where extremely 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 20 inch Schedule 160 pipe, the extra heavy wall thickness results in much higher installed weight than lighter schedules, so accurate weight data is important for engineering and construction work.
20 Inch Schedule 160 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 20 inch Schedule 160 pipe?
The outside diameter is 508 mm.
What is the wall thickness of DN500 Schedule 160 pipe?
The wall thickness is 50.01 mm.
What is the inside diameter of NPS 20 Schedule 160 pipe?
The inside diameter is 407.98 mm.
How much does 20 inch Schedule 160 pipe weigh?
The approximate weight is 564.85 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 160 pipe 20 inch (DN500) has an outside diameter of 508 mm, wall thickness of 50.01 mm, inside diameter of 407.98 mm, and a weight of 564.85 kg/m. It is a useful reference for piping design, fabrication, estimating, and heavy-duty industrial engineering work.
How to Read This Pipe Reference
NPS 20 and DN500 are nominal size designations rather than direct measurements of the pipe bore. The outside diameter is established for the nominal pipe size, while the Schedule 160 designation identifies the applicable heavy-wall series. The listed inside diameter is therefore derived from the outside diameter and wall thickness shown in the source data.
Schedule, diameter, and wall thickness
Pipe schedule should not be treated as a universal pressure rating. Pressure capability depends on the material, design temperature, allowable stress, corrosion allowance, fabrication details, joining method, and governing design code. The schedule identifies a dimensional wall series; engineering verification is still required for a particular service.
Using the weight data
The dry pipe weight is useful for preliminary material takeoffs, transport planning, lifting studies, support reactions, and structural load assessments. The filled-with-water value provides a separate installed-load reference when the pipe contents need to be considered. Actual supplied weight can differ because of manufacturing tolerances and product requirements, as noted in the source content.
Drafting and CAD workflow
The downloadable DWG can support layout, routing, and coordination work. Before using it for fabrication or construction, check the drawing units, connection details, centerline assumptions, wall representation, and compatibility with the project piping specification. The DWG should supplement—not replace—the dimensional table and approved design documents.
Related pipe reference topics
For broader design and drafting context, connect this page with the site’s pipe schedule reference, NPS and DN size guide, steel pipe weight reference, ASME B36.10 overview, and pipe CAD/DWG library. These related resources help readers compare schedules, interpret nominal sizing, and move from dimensional research to practical drafting work.
Additional Questions About 20 Inch Schedule 160 Pipe
Are NPS 20 and DN500 the same pipe size designation?
They are the nominal size designations used for the pipe covered by this reference. The actual outside diameter, wall thickness, and inside diameter should be taken from the applicable dimensional data rather than inferred from the nominal labels alone.
Does Schedule 160 alone establish the pipe pressure rating?
No. Schedule identifies the wall-thickness series. A pressure assessment also requires the applicable material, temperature, design code, corrosion considerations, manufacturing requirements, and other project inputs.
Can the listed weight be used for final support design?
It is useful for preliminary loading and estimating work, but final support design should account for the approved pipe specification, insulation, contents, valves, fittings, testing conditions, dynamic effects, and other applicable loads.
What should be checked before using the DWG?
Confirm the drawing units, dimensional assumptions, connection geometry, revision status, and alignment with the approved project specification. Treat the downloaded file as a reference resource unless it has been reviewed and accepted for the specific project.