This reference explains how to read the dimensional data for 1 inch Schedule 80S stainless steel pipe, also identified as DN25. Use the table below for the page’s authoritative OD, ID, wall thickness, and weight values, then use the editorial guidance to connect those dimensions with drafting, procurement, fabrication, and piping design tasks.
For related research, this page can be reviewed alongside references covering pipe schedules, NPS and DN designations, stainless steel pipe dimensions, and pipe fittings and flange compatibility.
Schedule 80S Pipe 1 Inch (DN25) is a stainless steel pipe size commonly used in industrial piping systems where corrosion resistance, dimensional consistency, and dependable wall thickness are important. Based on the current page data under ANSI/ASME B36.19, this pipe size has an outside diameter of 33.4 mm, an inside diameter of 24.3 mm, a wall thickness of 4.55 mm, and a pipe weight of 3.24 kg/m.
1 Inch Schedule 80S Pipe Dimensions
The following values are listed for NPS 1 Schedule 80S pipe, which corresponds to DN25 in metric designation.
- Pipe Size: NPS 1 Inch
- DN Size: DN25
- Outside Diameter (OD): 33.4 mm
- Inside Diameter (ID): 24.3 mm
- Wall Thickness: 4.55 mm
- Pipe Weight: 3.24 kg/m
- Pipe Weight Including Water: 3.7 kg/m
- Reference Standard: ANSI/ASME B36.19
Schedule 80S Pipe 1 Inch (DN25) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 80S | 1 Inch | 25 | 33.4 | 24.3 | 4.55 | 3.24 |
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 supports.
Common Uses of 1 Inch Schedule 80S Pipe
1 inch Schedule 80S pipe is commonly used in stainless steel piping systems that require good corrosion resistance, dependable wall thickness, and reliable flow capacity. This size is often selected for 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 industrial and utility 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 process and utility systems
- Pipeline modification 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 1 and DN25 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 1 and DN25, which is the standard naming format widely used in piping drawings, isometrics, and procurement specifications.
Conclusion
Schedule 80S Pipe 1 Inch (DN25) is listed on the current page with 33.4 mm OD, 24.3 mm ID, 4.55 mm wall thickness, and 3.24 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 dimensional table when checking a drawing, material take-off, or purchase description. The outside diameter is important for fittings, clamps, sleeves, supports, and layout clearances. The inside diameter is the relevant geometric dimension for flow-area review, while wall thickness is used when checking fabrication details, end preparation, and the selected pipe specification.
The listed pipe weight supports material estimates, handling plans, support-load reviews, and shipping calculations. The separate water-filled value should not be treated as a universal operating load; the actual contents, fittings, insulation, valves, and support spacing may add to the installed system load.
Schedule, Nominal Size, and Material Checks
Schedule 80S identifies a stainless steel dimensional wall series for the stated nominal size. It is not, by itself, a complete pressure-design specification. Final selection also requires project requirements for material grade, fluid, temperature, design pressure, corrosion conditions, joining method, inspection, and applicable code or specification.
NPS 1 and DN25 are nominal designations used to coordinate piping components. They should not be read as a promise that the actual OD or ID equals the nominal label. When preparing drawings or ordering components, compare the pipe dimensions with the mating fitting, flange, valve, gasket, and connection details rather than relying on the nominal designation alone.
Drafting and Procurement Notes
- Use the full designation, including material specification and schedule, in procurement documents where those details are required.
- Check that fittings and flanges are intended for the same dimensional pipe series and connection arrangement.
- Use the listed OD when coordinating supports, penetrations, sleeves, and clearance zones.
- Use the listed ID only for the applicable flow or hydraulic review; do not substitute nominal size for the tabulated dimension.
- Confirm the project specification before treating the tabulated weight as the complete installed piping load.
These points create useful links to related site references on pipe schedules, NPS-to-DN terminology, stainless steel pipe dimensions, fittings, flanges, pipe supports, and piping isometric drafting.
Frequently Asked Questions
What does Schedule 80S mean for this pipe?
Schedule 80S is the stainless steel pipe wall-thickness series identified for the nominal size. It helps coordinate dimensions and component compatibility, but it is not a complete pressure rating or material specification by itself.
Is 1 inch pipe the same designation as DN25?
On this page, NPS 1 and DN25 identify the same nominal pipe size. The actual outside and inside dimensions are the values shown in the page’s data table.
Why are both OD and ID listed?
OD is used for physical layout and component-fit checks, including supports and penetrations. ID is used when reviewing flow area and related hydraulic calculations. Wall thickness connects those dimensions and supports fabrication and specification checks.
Does the listed pipe weight include water?
The page provides a pipe-only weight and a separate pipe-weight value including water. The water-filled value should be kept distinct from the final operating load, which may also include contents, fittings, valves, insulation, and other attached components.
Can the dimensions be used to select a complete piping system?
No. The dimensions are useful for reference, layout, estimating, and coordination, but final selection requires verification of material grade, pressure and temperature conditions, fluid service, joining details, corrosion requirements, and project specifications.