This reference provides the listed dimensions and weight for 20 inch Schedule STD pipe, also identified as NPS 20 and DN500. Use the page data when coordinating pipe layout, fittings, flanges, supports, material takeoffs, transport, and drafting work.
The dimensional table is the primary project reference on this page. The explanations below clarify how to interpret nominal size, outside diameter, inside diameter, wall thickness, and Standard Weight designation without treating the schedule designation as a complete design specification.
Schedule STD Pipe 20 Inch (DN500) is a steel pipe size commonly used in large industrial and utility piping systems where standard dimensions, structural reliability, and high flow capacity are important. Based on the current page data under ANSI/ASME B36.10, this pipe size has an outside diameter of 508 mm, an inside diameter of 488.94 mm, a wall thickness of 9.53 mm, and a pipe weight of 117.15 kg/m.
20 Inch Schedule STD Pipe Dimensions
The following values are listed for NPS 20 Schedule STD pipe, which corresponds to DN500 in metric designation.
- Pipe Size: NPS 20 Inch
- DN Size: DN500
- Outside Diameter (OD): 508 mm
- Inside Diameter (ID): 488.94 mm
- Wall Thickness: 9.53 mm
- Pipe Weight: 117.15 kg/m
- Pipe Weight Including Water: 304.81 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule STD Pipe 20 Inch (DN500) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| STD | 20 Inch | 500 | 508 | 488.94 | 9.53 | 117.15 |
What Is Schedule STD Pipe?
Schedule STD means Standard Weight in the IPS pipe system and is commonly referenced for carbon steel and steel pipe dimensions under ASME B36.10. In practical piping work, Schedule STD is used as a standard wall thickness designation for many nominal pipe sizes. It helps engineers, fabricators, and buyers confirm dimensional compatibility, estimate weight, and coordinate with fittings, flanges, supports, and structural loads.
Common Uses of 20 Inch Schedule STD Pipe
20 inch Schedule STD pipe is commonly used in large piping systems where high flow capacity and standard steel pipe dimensions are required. This size is often selected for utility, transmission, and industrial services where large-volume flow and reliable dimensional data are important for design and construction.
- Large water transmission lines for plant and utility service
- Cooling water systems in power plants and industrial facilities
- Stormwater and drainage piping in infrastructure projects
- Industrial utility piping for bulk fluid transport
- Pipeline headers and manifolds in large process plants
- Pump suction and discharge lines where large diameter piping is needed
- Municipal and public works projects requiring large steel pipe sizes
- Replacement and upgrade projects where standard pipe dimensions are required
In practical engineering work, this pipe size may be reviewed when checking flow capacity, support loading, transport weight, handling requirements, and installation planning. Final pipe selection should always be verified against project pressure, temperature, fluid type, corrosion allowance, and material specifications.
Why OD, ID, Thickness, and Weight Matter
Exact OD, ID, wall thickness, and weight values are important for support design, material take-off, transport planning, lifting studies, welding preparation, and installation work. For a pipe as large as 20 inch DN500, accurate weight data is especially useful for crane selection, support design, and logistics planning. Inside diameter is also important for flow calculations and hydraulic 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, specifications, and procurement documents.
Conclusion
Schedule STD Pipe 20 Inch (DN500) is listed on the current page with 508 mm OD, 488.94 mm ID, 9.53 mm wall thickness, and 117.15 kg/m weight. It is a useful steel pipe reference for engineers, designers, and buyers who need standard dimensional and weight data for large piping systems and project coordination.
How to Use This 20 Inch DN500 Pipe Reference
Start with the listed outside diameter when checking dimensional compatibility with fittings, flanges, clamps, supports, sleeves, and structural openings. The inside diameter is the relevant dimensional input for preliminary flow-area and hydraulic reviews, while the listed wall thickness supports fabrication, welding, and clearance coordination.
The reported pipe weight is useful for material takeoffs, transport planning, lifting studies, support reactions, and pipe-rack coordination. The separate water-filled weight value in the source data should be reviewed when considering temporary handling or operating support loads. Actual project loads can also depend on valves, fittings, insulation, lining, contents, support spacing, and applicable design requirements.
Schedule STD Is a Dimensional Designation
Schedule STD identifies a Standard Weight pipe wall designation for the referenced nominal size. It helps users select dimensionally compatible components, but it does not by itself establish an allowable pressure, temperature limit, corrosion life, material grade, or complete piping-class requirement. Those items must be confirmed from the project specification, material documentation, service conditions, and engineering calculations.
Coordination With Related Piping References
For a complete piping review, compare this page with related references for pipe schedules, butt-weld fittings, flange dimensions, pipe supports, and piping symbols. These topics help connect the straight-pipe dimensions to isometric drawings, general-arrangement layouts, procurement documents, and fabrication details.
The downloadable DWG reference can support drafting and layout coordination. Treat downloaded CAD geometry as a reference asset and verify units, layer conventions, connection details, tolerances, and project-specific revisions before using it in issued design documents.
Selection Checks Before Procurement
- Confirm that NPS, DN, schedule, and the applicable dimensional standard match the piping specification.
- Check material grade, manufacturing requirements, end preparation, joining method, and inspection requirements separately.
- Review pressure, temperature, fluid, corrosion allowance, and design-code requirements with the responsible engineer.
- Coordinate the pipe dimensions with mating fittings, flanges, valves, gaskets, supports, and equipment nozzles.
- Use the listed weight for estimating and coordination, then verify the project basis for final structural and lifting calculations.
Frequently Asked Questions
What does 20 inch Schedule STD pipe mean?
It describes a pipe with a nominal size of NPS 20, identified on this page as DN500, using the Schedule STD or Standard Weight designation. The page provides the corresponding OD, ID, wall thickness, and weight.
What is the reference standard for this pipe data?
The source data identifies ANSI/ASME B36.10 as the reference standard. Confirm the project specification and applicable edition or governing requirements before procurement.
Does Schedule STD by itself define the pipe pressure rating?
No. Schedule STD describes a dimensional wall designation. Pressure capability also depends on material, temperature, corrosion allowance, joining details, design code, manufacturing requirements, and other project conditions.
Why are both OD and ID important?
OD is used for external fit-up and coordination with supports, openings, fittings, and flanges. ID is used when reviewing flow area, hydraulic behavior, internal clearance, and equipment or process connections.
Why is the pipe weight useful?
The listed weight supports estimating, transport, lifting, support-load review, and pipe-rack coordination. A project load review should also account for contents, fittings, valves, insulation, lining, and other attached items.
Can the DWG file be used directly for fabrication?
The DWG is presented as a reference resource for drafting and layout work. Verify dimensions, units, connection details, tolerances, and project revisions before using it for fabrication or issued-for-construction documentation.