This reference page is intended for engineers, designers, fabricators, estimators, and CAD detailers checking Schedule 100 Pipe 20 Inch data. Use the table for the authoritative dimensional values, then apply the supporting notes to understand how nominal size, schedule, weight, and clear flow area relate during piping work.
For related terminology, compare this entry with the site’s pipe dimensions reference and pipe schedule guide. The downloadable DWG can also support drafting and layout tasks, but project drawings should be checked against the applicable material specification, fabrication requirements, and approved design documents.
Schedule 100 pipe 20 inch (DN500) 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 20 Schedule 100 pipe based on ASME B36.10.
20 Inch Schedule 100 Pipe Dimensions
- Nominal Pipe Size (NPS): 20 inch
- Diameter Nominal (DN): DN500
- Outside Diameter (OD): 508 mm
- Wall Thickness: 32.54 mm
- Inside Diameter (ID): 442.92 mm
- Pipe Weight: 381.55 kg/m
- Pipe Weight Filled With Water: 535.54 kg/m
- Reference Standard: ASME B36.10
Schedule 100 Pipe 20 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 20 inch | 500 | 508 | 32.54 | 442.92 | 381.55 |
What Does Schedule 100 Mean?
Schedule 100 refers to a heavier wall thickness series than lighter schedules such as Schedule 10 or Schedule 40. 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 20 Inch Schedule 100 Pipe
NPS 20 Schedule 100 pipe is commonly referenced for heavy-duty industrial piping systems where higher wall thickness is required. It may be used in process piping, plant utility systems, fabrication work, structural loading checks, 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, lifting studies, support design, structural loading, fabrication estimates, and installation planning. For a 20 inch Schedule 100 pipe, the heavy wall thickness creates a much higher installed weight than lighter schedules, so accurate weight data is important for engineering and construction work.
20 Inch Schedule 100 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 100 pipe?
The outside diameter is 508 mm.
What is the wall thickness of DN500 Schedule 100 pipe?
The wall thickness is 32.54 mm.
What is the inside diameter of NPS 20 Schedule 100 pipe?
The inside diameter is 442.92 mm.
How much does 20 inch Schedule 100 pipe weigh?
The approximate weight is 381.55 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for welded and seamless wrought steel pipe.
Conclusion
Schedule 100 pipe 20 inch (DN500) has an outside diameter of 508 mm, wall thickness of 32.54 mm, inside diameter of 442.92 mm, and a weight of 381.55 kg/m. It is a useful reference for piping design, fabrication, estimating, and heavy-duty industrial engineering work.
How to Read This Pipe Reference
The listed outside diameter is the fixed dimensional basis for this nominal pipe size. The schedule identifies the wall series, while the inside diameter is obtained after accounting for the wall on both sides of the pipe. This distinction is important because nominal pipe size is a standardized designation rather than a direct measurement of either the outside or inside diameter.
Schedule, Flow Area, and Weight
A heavier schedule uses more metal within the same outside-diameter envelope. That reduces the available internal passage and increases the pipe’s mass per unit length. These changes affect practical checks such as support loading, lifting arrangements, transport planning, spool handling, and available flow area.
Schedule designation should not be treated as a complete pressure-rating statement. Pressure capability also depends on material, temperature, manufacturing condition, joint details, corrosion allowance, code requirements, and the design basis. Confirm those items before using dimensional data for procurement or final engineering.
Using the Data in Design and Drafting
- Use the outside diameter when coordinating clearances, clamps, supports, sleeves, and connection geometry.
- Use the inside diameter when reviewing flow passage, lining requirements, pigging considerations, or internal access.
- Use the listed pipe mass for preliminary support and handling estimates, while allowing for fittings, valves, flanges, coatings, insulation, and contents where applicable.
- Use the filled-pipe value only in the context stated by the table; operating contents and other attachments may create different installed loads.
For related checks, link this page with the site’s pipe weight resources, pipe fittings reference, and flange dimension guides. These references help connect straight-pipe data with the components and loads shown on real piping drawings.
Checking the CAD Download
The DWG download is useful as a drafting reference for the pipe profile and nominal dimensions. Before incorporating it into a fabrication or construction drawing, verify units, drawing scale, connection details, tolerances, material requirements, and the project’s approved standard. A CAD file should support engineering review rather than replace it.
Additional Questions About 20 Inch Schedule 100 Pipe
Is nominal pipe size the same as the measured inside diameter?
No. Nominal pipe size is a standardized designation. The actual outside and inside dimensions are determined by the applicable pipe dimensional series and schedule.
Does a heavier schedule always mean a higher allowable pressure?
Not by itself. A thicker wall can be an important design variable, but allowable pressure must be established using the governing code, material specification, temperature, manufacturing details, and other design conditions.
Should the tabulated pipe weight be used as the complete installed load?
No. The tabulated value represents the pipe basis described on this page. Installed loading may also include contents, fittings, valves, flanges, insulation, coating, supports, and other attachments.
Why should the inside diameter be checked separately from the nominal size?
Inside diameter affects flow passage and internal clearances. It changes with wall thickness, so it should be taken from the applicable dimensional data rather than inferred from the nominal designation alone.