This reference page is designed for engineers, designers, estimators, fabricators, and CAD users checking 20 inch Schedule 30 pipe data. Use the dimensional table to distinguish the nominal size from the actual outside and inside diameters, then apply the weight information to early layout, material takeoff, handling, and support-load reviews.
For related size comparisons, see the linked 18 inch DN450 Schedule 30 pipe and 22 inch DN550 Schedule 30 pipe pages.
Schedule 30 pipe 20 inch (DN500) is a large-diameter steel pipe size commonly used in piping design, drafting, fabrication, estimation, and industrial layout work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 20 Schedule 30 pipe based on ASME B36.10.
For engineers, designers, estimators, and CAD users, quick access to accurate pipe data helps improve piping layout, support planning, weight checks, transport review, and fabrication coordination during project development.
20 Inch Schedule 30 Pipe Dimensions
- Nominal Pipe Size (NPS): 20 inch
- Diameter Nominal (DN): DN500
- Outside Diameter (OD): 508 mm
- Wall Thickness: 12.7 mm
- Inside Diameter (ID): 482.6 mm
- Pipe Weight: 155.13 kg/m
- Pipe Weight Including Water: 337.95 kg/m
- Standard: ASME B36.10
Schedule 30 Pipe 20 Inch Data Table
| NPS | DN | Outside Diameter (OD) | Wall Thickness | Inside Diameter (ID) | Weight |
|---|---|---|---|---|---|
| 20 inch | DN500 | 508 mm | 12.7 mm | 482.6 mm | 155.13 kg/m |
Understanding 20 Inch Schedule 30 Pipe
20 inch Schedule 30 pipe is a large steel pipe size used as a reference in industrial piping layouts, utility systems, water transmission lines, process design studies, and CAD drafting. With an outside diameter of 508 mm and a wall thickness of 12.7 mm, this pipe size is suitable for large-flow applications where designers need a balance between flow capacity and pipe wall strength.
What Does Schedule 30 Mean?
Schedule 30 refers to the wall thickness series of the pipe. For NPS 20, Schedule 30 gives a wall thickness of 12.7 mm. The schedule affects the inside diameter, total pipe weight, fabrication planning, and compatibility with supports, fittings, and structural loading requirements.
Why These Pipe Dimensions Matter
Accurate pipe dimension data is important for piping layouts, spool drawings, support design, structural load review, and material takeoff. Knowing that this pipe weighs 155.13 kg/m helps with transport estimates, lifting plans, and support loading. If the pipe is filled with water, the total weight increases to 337.95 kg/m, which is useful for operating load calculations and support checks.
Common Uses of DN500 Schedule 30 Pipe
DN500 Schedule 30 pipe may be referenced in industrial utility systems, large water transfer lines, plant layout studies, process piping documentation, and engineering design work. It is also useful for piping designers, CAD users, estimators, and procurement teams who need standard steel pipe dimensions for large-diameter piping systems.
Difference Between NPS 20 and DN500
NPS 20 is the inch-based nominal pipe size designation, while DN500 is the metric nominal diameter reference. Both refer to the same pipe size category on this page. The actual standard outside diameter for this size is 508 mm.
How to Use This Data
You can use this page to quickly check:
- pipe outside diameter for layout and clearance
- inside diameter for flow reference
- wall thickness for schedule comparison
- weight per meter for estimation and transport planning
- water-filled weight for support and structural load review
Quick Reference for Schedule 30 Pipe 20 Inch
- Pipe Size: 20 inch
- DN: DN500
- OD: 508 mm
- ID: 482.6 mm
- Wall Thickness: 12.7 mm
- Weight: 155.13 kg/m
- Weight Including Water: 337.95 kg/m
- Reference Standard: ASME B36.10
Related Pipe Size Pages
Conclusion
Schedule 30 Pipe 20 Inch (DN500) is an important large-diameter steel pipe reference for piping design, drafting, estimation, and fabrication work. With its 508 mm outside diameter, 12.7 mm wall thickness, and 155.13 kg/m pipe weight, it provides useful dimensional data for engineers and designers who need fast and accurate pipe information.
Note: NPS = Nominal Pipe Size, DN = Diameter Nominal. Dimensions and weights shown here are based on ASME B36.10 steel pipe data.
How to Read the Pipe Data
NPS 20 and DN500 are nominal designations for the same pipe size category. They should not be interpreted as the measured inside diameter. For physical layout and clearance checks, use the listed outside diameter. For a preliminary flow-area or bore reference, use the listed inside diameter.
The schedule identifies the wall-thickness series for this NPS. Wall thickness affects the available internal bore, the mass of the pipe, fabrication details, and the loads transferred to supports. When comparing this pipe with another schedule, check all of these values rather than comparing the schedule label alone.
Using Weight Data in Project Work
The listed pipe weight per meter is useful for material estimates, transport reviews, lifting discussions, and preliminary support-load coordination. The water-filled figure represents a different operating condition from the empty-pipe figure, so drawings and calculations should clearly identify which condition is being considered.
Support spacing, anchor loads, thermal movement, pressure design, corrosion allowance, material grade, fabrication tolerances, insulation, coatings, valves, and fittings require project-specific verification. This page is a dimensional reference and should be coordinated with the applicable design basis, piping specifications, and engineering calculations before procurement or construction.
Drafting and Coordination Tips
- Use the outside diameter when checking pipe envelope, clearances, sleeves, and arrangement space.
- Use the inside diameter as the dimensional reference for bore and flow discussions, while confirming process requirements separately.
- Identify whether an estimate uses empty-pipe or water-filled weight.
- Coordinate the pipe dimensions with connected fittings, flanges, valves, supports, and the project piping specification.
- Keep the DWG reference coordinated with the governing project units, material specification, and revision control.
Frequently Asked Questions
What is the outside diameter of 20 inch Schedule 30 pipe?
The listed outside diameter is 508 mm. This is the primary pipe dimension to use for layout envelope and clearance checks.
What is the inside diameter of DN500 Schedule 30 pipe?
The listed inside diameter is 482.6 mm. Use it as the dimensional bore reference and confirm hydraulic requirements through the project design.
What wall thickness does NPS 20 Schedule 30 pipe have?
For the pipe data shown on this page, Schedule 30 corresponds to a wall thickness of 12.7 mm.
How much does 20 inch Schedule 30 pipe weigh?
The listed pipe weight is 155.13 kg/m. The listed weight including water is 337.95 kg/m, which is relevant when reviewing an operating or filled condition.
Are NPS 20 and DN500 the same pipe size?
They are the inch-based and metric nominal designations used for the same pipe size category on this page. The actual outside diameter remains the listed standard dimension, rather than either nominal label.