This reference page helps engineers, estimators, fabricators, and CAD users interpret the published data for 28 inch Schedule 20 pipe. Use the table for dimensional checks, then review the terminology and calculation notes before applying the values to drawings, material takeoffs, handling plans, or piping studies.
The NPS and DN designations identify the nominal pipe size, while the outside diameter, wall thickness, and inside diameter describe the physical section. The listed mass values are useful for preliminary estimating, but project work should also account for the applicable material specification, manufacturing tolerances, coatings, linings, fittings, valves, and attachments.
Schedule 20 pipe 28 inch (DN700) is a large-diameter 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 28 Schedule 20 pipe based on ASME B36.10.
28 Inch Schedule 20 Pipe Dimensions
- Nominal Pipe Size (NPS): 28 inch
- Diameter Nominal (DN): DN700
- Outside Diameter (OD): 711 mm
- Wall Thickness: 12.7 mm
- Inside Diameter (ID): 685.6 mm
- Pipe Weight: 218.71 kg/m
- Pipe Weight Filled With Water: 587.69 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 20 Pipe 28 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 28 inch | 700 | 711 | 12.7 | 685.6 | 218.71 |
What Does Schedule 20 Mean?
Schedule 20 refers to a lighter wall thickness series than heavier schedules such as Schedule 40, Schedule 80, or Schedule 160. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness changes according to the schedule. A lighter wall gives a larger inside diameter and lower pipe weight.
Typical Uses of 28 Inch Schedule 20 Pipe
NPS 28 Schedule 20 pipe is commonly referenced in large-diameter industrial piping systems, utility lines, water-related systems, plant layout drawings, and fabrication work where a large flow area is needed with lower wall thickness than heavier pipe schedules.
Why Pipe Weight Matters
Pipe weight per meter is important for transport planning, crane lifting studies, support design, structural loading, fabrication estimates, and installation planning. For a 28 inch pipe, total line weight can still become very high even with a lighter schedule, so accurate data is essential for engineering work.
28 Inch Schedule 20 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 28 inch Schedule 20 pipe?
The outside diameter is 711 mm.
What is the wall thickness of DN700 Schedule 20 pipe?
The wall thickness is 12.7 mm.
What is the inside diameter of NPS 28 Schedule 20 pipe?
The inside diameter is 685.6 mm.
How much does 28 inch Schedule 20 pipe weigh?
The approximate weight is 218.71 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 20 pipe 28 inch (DN700) has an outside diameter of 711 mm, wall thickness of 12.7 mm, inside diameter of 685.6 mm, and a weight of 218.71 kg/m. It is a useful reference for piping design, fabrication, estimating, and industrial engineering work.
How to Read This Pipe Reference
The dimensional data is organized around the relationship between nominal size and actual geometry. NPS 28 and DN700 are size designations used to identify the same nominal pipe size in customary and metric-oriented terminology. The outside diameter is the fixed reference for this pipe size, while the schedule identifies the wall-thickness series.
For drafting and layout work, the outside diameter is generally important when checking clearances, supports, clamps, insulation space, and connections. The inside diameter is more relevant when reviewing the available flow passage or preparing a preliminary hydraulic comparison. These dimensions should not be treated as a substitute for project-specific pressure, corrosion, fabrication, or mechanical-design verification.
Using the Weight Information
The dry pipe weight supports preliminary material estimates, shipping discussions, lifting studies, and support-load reviews. The water-filled value provides an additional reference for systems in service or during filling, but a complete operating load review may also need to include insulation, lining, valves, flanges, supports, contents other than water, and temporary test conditions.
Related Pipe References
For broader comparison, connect this page to the site’s pipe schedule guide, steel pipe dimensions reference, pipe weight calculator, ASME B36.10 overview, and large-diameter pipe drafting resources. These related references can help readers move from a single-size lookup to schedule comparison, estimating, and CAD coordination without duplicating the authoritative table on this page.
Drafting and Procurement Checks
- Confirm that the nominal size and schedule on the drawing match the material list and specification.
- Use the stated outside diameter when coordinating space, supports, sleeves, and connection details.
- Check whether the project requires additional allowances or separate data for corrosion, lining, coating, or manufacturing tolerance.
- Verify the applicable product specification and supplier documentation before issuing a purchase order or fabrication release.
Additional Questions About 28 Inch Schedule 20 Pipe
Are NPS 28 and DN700 interchangeable designations?
They identify the same nominal pipe size in different designation systems. The actual dimensional values should still be taken from the applicable pipe reference and project specification.
Does Schedule 20 describe the pipe material grade?
No. Schedule describes the wall-thickness series. Material grade, manufacturing method, testing, and end preparation are separate procurement and specification requirements.
Can the listed weight be used as the final support load?
It is a reference value for the pipe itself. Final support and structural checks should include the contents, fittings, valves, insulation, attachments, operating conditions, and any project-specific allowances.
Why should the inside diameter be checked separately?
The inside diameter is the useful passage through the pipe and can affect flow review, equipment interfaces, and internal clearance. It is not determined by the nominal designation alone.