Use this page as a dimensional reference for 20 inch Schedule 80S stainless steel pipe, also identified as NPS 20 and DN500. The table below provides the page’s stated outside diameter, inside diameter, wall thickness, and unit weight for drafting, estimating, procurement, and piping layout work.
For related design checks, compare this reference with resources covering pipe schedules, stainless steel pipe dimensions, flange dimensions, and pipe support loads. A dimensional table confirms the pipe geometry, but project requirements still determine whether the selected pipe is appropriate for a particular service.
Schedule 80S Pipe 20 Inch (DN500) is a stainless steel pipe size commonly used in industrial piping systems where corrosion resistance, dimensional consistency, and reliable wall thickness are important. Based on the current page data under ANSI/ASME B36.19, this pipe size has an outside diameter of 508 mm, an inside diameter of 482.6 mm, a wall thickness of 12.7 mm, and a pipe weight of 155.13 kg/m.
20 Inch Schedule 80S Pipe Dimensions
The following values are listed for NPS 20 Schedule 80S pipe, which corresponds to DN500 in metric designation.
- Pipe Size: NPS 20 Inch
- DN Size: DN500
- Outside Diameter (OD): 508 mm
- Inside Diameter (ID): 482.6 mm
- Wall Thickness: 12.7 mm
- Pipe Weight: 155.13 kg/m
- Pipe Weight Including Water: 337.95 kg/m
- Reference Standard: ANSI/ASME B36.19
Schedule 80S Pipe 20 Inch (DN500) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 80S | 20 Inch | 500 | 508 | 482.6 | 12.7 | 155.13 |
What Is Schedule 80S Pipe?
Schedule 80S is a stainless steel pipe schedule designation commonly used under ASME B36.19. In piping design and fabrication, the schedule identifies the wall thickness series for a given nominal pipe size. This helps engineers, buyers, and fabricators confirm dimensional compatibility, estimate pipe weight, and coordinate with fittings, flanges, and support systems.
Common Uses of 20 Inch Schedule 80S Pipe
20 inch Schedule 80S pipe is commonly used in stainless steel piping systems that require good corrosion resistance, dependable wall thickness, and large flow capacity. This size is often selected in industrial projects where standard dimensions are needed for design, fabrication, procurement, and installation work.
- Process piping systems in chemical and industrial plants
- Water transmission lines for medium to large flow service
- Cooling water and utility piping in plant facilities
- Marine and offshore piping where stainless steel is preferred
- Food and beverage plants requiring corrosion-resistant piping materials
- Pharmaceutical facilities using stainless steel process lines
- Pump suction and discharge piping for larger piping systems
- Pipeline upgrade and replacement work where standard pipe dimensions are required
In practical engineering work, this pipe size may be checked when reviewing flow area, piping layout, support loading, transport weight, and installation requirements. Final pipe selection should always be verified against project pressure, temperature, fluid type, and material specifications.
Why OD, ID, Thickness, and Weight Matter
Exact OD, ID, wall thickness, and weight values are important for pipe support design, material take-off, transport planning, welding preparation, and installation work. Weight data is also useful for lifting calculations and total piping load estimates, while inside diameter affects flow calculations and system capacity review.
NPS 20 and DN500 Explained
NPS means nominal pipe size in inch units, while DN means diameter nominal in metric units. The current page identifies this pipe as NPS 20 and DN500, which is the standard naming format widely used in piping drawings, isometrics, and procurement specifications.
Conclusion
Schedule 80S Pipe 20 Inch (DN500) is listed on the current page with 508 mm OD, 482.6 mm ID, 12.7 mm wall thickness, and 155.13 kg/m weight. It is a useful stainless steel pipe reference for piping engineers, designers, and buyers who need standard dimensional and weight data for project planning and material selection.
How to Use This Pipe Reference
Start with the nominal designation shown on the page, then use the listed outside diameter when coordinating space, clamps, supports, sleeves, and connections. Use the inside diameter for flow-area reviews and hydraulic calculations, while the wall thickness helps with fabrication details, end preparation, and dimensional coordination.
The listed unit weight is useful for material takeoffs, transport planning, lifting reviews, and preliminary support-load estimates. When calculating an installed piping load, engineers may also need to account for contents, insulation, valves, fittings, supports, and operating conditions rather than relying on bare-pipe weight alone.
Procurement and Drafting Checks
- Confirm that the purchase description identifies stainless steel pipe and the required Schedule 80S designation.
- Check that drawings, isometrics, bills of material, and specifications use compatible NPS and DN terminology.
- Coordinate the pipe dimensions with mating fittings, flanges, valves, gaskets, and connection details.
- Use the downloadable DWG reference when preparing layouts or checking dimensional relationships in CAD.
- Review the project material, pressure, temperature, fluid, corrosion, welding, inspection, and code requirements before release for fabrication or installation.
Related Reference Topics
This page can serve as a starting point for internal research into NPS and DN pipe sizing, schedule-based wall thickness, stainless steel piping, pipe weight calculations, flange and fitting compatibility, and CAD/DWG piping details. Linking these topics together helps readers move from a dimensional lookup to the broader checks required for a complete piping design.
Frequently Asked Questions
What are the listed dimensions for 20 inch Schedule 80S pipe?
The page lists an outside diameter of 508 mm, an inside diameter of 482.6 mm, and a wall thickness of 12.7 mm for NPS 20, also identified as DN500.
What is the listed weight of Schedule 80S pipe in this size?
The listed pipe weight is 155.13 kg/m. The page also provides a separate value for pipe weight including water, which should be treated as a reference condition rather than a substitute for a project-specific operating-load calculation.
What does Schedule 80S mean?
Schedule 80S identifies a stainless steel pipe wall-thickness series associated with the dimensional reference cited on this page. The schedule helps users coordinate pipe dimensions with fittings, flanges, supports, drawings, and procurement documents.
Are NPS 20 and DN500 the same designation?
On this page, NPS 20 and DN500 identify the same nominal pipe size using inch-based and metric-based terminology. They are nominal designations and should be checked alongside the stated outside diameter and other dimensional data.
Can these dimensions alone determine whether the pipe is suitable for a project?
No. Dimensional data supports layout and estimating work, but final selection requires review of the project pressure, temperature, fluid, corrosion environment, material specification, joining method, applicable code requirements, and engineering design.