This page is a quick reference for 20 inch Schedule 5 pipe dimensions and the equivalent DN500 designation. Use the source table when checking outside diameter, inside diameter, wall thickness, and weight for drafting, estimating, fabrication, or piping coordination.
Because NPS and DN are nominal designations, the listed outside diameter and calculated inside diameter should be checked against the applicable project specification before ordering or detailing components. For related work, compare this entry with pipe schedule references, NPS-to-DN terminology, flange dimensions, fitting dimensions, and downloadable CAD/DWG resources.
Schedule 5 Pipe 20 Inch (DN500) is a large steel pipe size commonly used in industrial piping systems that require high flow capacity with a relatively light wall thickness. This pipe size is often used in utility piping, water transfer systems, low-pressure industrial service, and general steel pipe fabrication work.
This dimension data is based on ANSI/ASME B36.10, which is the standard commonly used for carbon steel pipe dimensions.
20 Inch Schedule 5 Pipe Dimensions
- Pipe Schedule: 5
- Nominal Pipe Size: 20 Inch
- DN Size: DN500
- Outside Diameter (OD): 508 mm
- Inside Diameter (ID): 498.44 mm
- Wall Thickness: 4.78 mm
- Pipe Weight: 59.32 kg/m
- Pipe Weight Including Water: 254.34 kg/m
- Standard: ANSI/ASME B36.10
Schedule 5 Pipe 20 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 5 | 20 | 500 | 508 | 498.44 | 4.78 | 59.32 |
What Is 20 Inch Schedule 5 Pipe?
A 20 inch Schedule 5 pipe is a steel pipe with a nominal size of 20 inches and a relatively thin wall thickness compared with heavier schedules. For this size, the outside diameter is fixed at 508 mm, while the inside diameter is 498.44 mm based on a wall thickness of 4.78 mm.
Schedule 5 pipe is often selected when a project needs large flow capacity, reduced pipe weight, and easier handling compared with thicker wall pipes. It is commonly referenced in steel piping design, drafting, fabrication, and material takeoff work.
Where Is Schedule 5 Pipe 20 Inch Used?
This pipe size is commonly used in applications that need large flow capacity with relatively light wall thickness. Typical uses include:
- Water transfer and distribution systems
- Utility and low-pressure industrial piping
- Large process and service lines
- Pipe spool fabrication and layout work
- General steel piping projects
Why Pipe Dimensions Matter
Accurate 20 inch Schedule 5 pipe dimensions are important for piping layout, fabrication, transport planning, support design, and installation work. Engineers and designers often check OD, ID, wall thickness, and weight before selecting supports, fittings, welding details, and handling methods.
The outside diameter is important for matching supports, clamps, and pipe accessories. The inside diameter helps estimate internal flow area and system capacity. The wall thickness affects mechanical strength and specification compliance, while the pipe weight per meter is useful for lifting plans, transport, and structural loading calculations.
20 Inch Schedule 5 Pipe Weight Information
The nominal weight of this pipe size is 59.32 kg/m. When filled with water, the combined weight becomes approximately 254.34 kg/m. This information is useful for pipe support design, structural coordination, and lifting preparation in large piping systems.
Difference Between NPS 20 and DN500
NPS 20 is the inch-based nominal pipe size, while DN500 is the metric designation used in international drawings and specifications. Both terms refer to the same nominal pipe size, and users may search by either inch size or DN format depending on project standards.
Common Search Terms for This Pipe Size
Users may also search for this pipe using related keywords such as 20 inch Schedule 5 pipe dimensions, DN500 Schedule 5 pipe dimensions, 20 inch pipe weight per meter, DN500 pipe dimensions, or DN500 sch 5 pipe dimensions.
Conclusion
Schedule 5 Pipe 20 Inch (DN500) has an outside diameter of 508 mm, an inside diameter of 498.44 mm, a wall thickness of 4.78 mm, and a weight of 59.32 kg/m. It is a useful steel pipe reference size for design, drafting, fabrication, and procurement work.
This page provides a quick reference for engineers, drafters, fabricators, and buyers who need reliable 20 inch Schedule 5 pipe dimensions and DN500 pipe dimensions in one place.
How to Use This 20 Inch Schedule 5 Pipe Reference
The dimensional data is most useful when several parts of a piping system must be coordinated. The outside diameter is commonly checked against supports, clamps, sleeves, and connection components. The inside diameter provides a reference for flow-area assessments, while the listed wall thickness supports material takeoffs, fabrication review, and specification checks.
The listed pipe weight can also support preliminary handling, transport, and support-coordination work. A water-filled weight is a different loading condition from the empty-pipe weight; the actual operating load should account for the fluid, insulation, lining, attachments, valves, and other connected components where applicable.
Design and Procurement Checks
- Confirm the required material grade, manufacturing specification, and project design code separately from the dimensional schedule.
- Check whether the selected fittings, flanges, valves, and supports use the same nominal size and compatible outside-diameter basis.
- Do not use the schedule designation alone to establish allowable pressure, structural adequacy, or service suitability.
- Review corrosion allowance, fabrication tolerances, joining method, temperature, fluid properties, and operating conditions before final approval.
- Use the accompanying DWG resource for reference and coordination, then verify the drawing against the approved project specification.
Related Pipe Reference Topics
This entry can serve as a starting point for nearby reference content on pipe schedules, DN and NPS designations, steel pipe weight, flange selection, fitting dimensions, and pipe support coordination. Linking these topics helps readers move from a dimensional lookup to the connection, layout, and installation information needed for a complete piping review.
Frequently Asked Questions
What does 20 inch Schedule 5 pipe mean?
It identifies a pipe with a nominal pipe size of 20 inches and a Schedule 5 wall designation. The source data provides the corresponding OD, ID, wall thickness, and weight for the DN500 reference size.
Are NPS 20 and DN500 the same pipe size?
They are the inch-based and metric nominal designations used to identify the same reference pipe size. Always check the actual dimensional data when coordinating components or preparing procurement documents.
How should the listed pipe weight be used?
The empty-pipe weight is useful for preliminary material takeoffs, transport planning, lifting coordination, and support studies. Final loading checks should also include the contents and any attached or supported equipment.
Can the schedule number determine the pipe pressure rating?
No. The schedule is a dimensional designation and should not be treated as a complete pressure-rating determination. Allowable pressure and service suitability require review of the material, temperature, design code, manufacturing requirements, and project conditions.
Is the DWG file suitable for final construction?
The downloadable DWG is a reference resource for drafting and coordination. Confirm its dimensions, units, layers, revision status, and project-specific requirements before using it for approved construction documentation.