This reference page is intended for engineers, designers, drafters, fabricators, estimators, and procurement teams checking 1 inch Schedule 10S stainless steel pipe. It brings together the NPS, DN, outside diameter, wall thickness, inside diameter, and weight values needed for preliminary layout, material takeoffs, and CAD work.
Use the dimension table with related references for pipe schedules, NPS and DN conversion, stainless steel pipe dimensions, fittings, and flange selection. The downloadable DWG can also support drafting workflows, but project documents should be checked against the applicable specification and supplier documentation.
Schedule 10S pipe 1 inch (DN25) is a stainless steel pipe size commonly used in piping design, fabrication, drafting, and engineering reference work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 1 Schedule 10S pipe based on ASME B36.19.
1 Inch Schedule 10S Pipe Dimensions
- Nominal Pipe Size (NPS): 1 inch
- Diameter Nominal (DN): DN25
- Outside Diameter (OD): 33.4 mm
- Wall Thickness: 2.77 mm
- Inside Diameter (ID): 27.86 mm
- Pipe Weight: 2.09 kg/m
- Pipe Weight Filled With Water: 2.69 kg/m
- Reference Standard: ASME B36.19
- Pipe Type: Stainless Steel Pipe
Schedule 10S Pipe 1 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1 inch | 25 | 33.4 | 2.77 | 27.86 | 2.09 |
What Does Schedule 10S Mean?
Schedule 10S is a stainless steel pipe schedule covered by ASME B36.19. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness changes with the schedule. The “S” designation is commonly used for stainless steel pipe schedules.
Typical Uses of 1 Inch Schedule 10S Pipe
NPS 1 Schedule 10S pipe is commonly used in stainless steel piping systems for industrial plants, utility services, food and beverage facilities, water-related systems, and fabrication work where corrosion resistance and dimensional accuracy are important.
Why Pipe Weight Matters
Pipe weight per meter is useful for transport planning, lifting studies, support design, structural loading, fabrication estimates, and installation planning. In stainless steel piping systems, accurate weight data helps improve material handling, support spacing, and total project cost estimation.
1 Inch Schedule 10S Pipe Calculation Notes
The listed weight is based on standard stainless steel pipe dimensions using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material grade, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 1 inch Schedule 10S pipe?
The outside diameter is 33.4 mm.
What is the wall thickness of DN25 Schedule 10S pipe?
The wall thickness is 2.77 mm.
What is the inside diameter of NPS 1 Schedule 10S pipe?
The inside diameter is 27.86 mm.
How much does 1 inch Schedule 10S pipe weigh?
The approximate weight is 2.09 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.19 for stainless steel pipe.
Conclusion
Schedule 10S pipe 1 inch (DN25) has an outside diameter of 33.4 mm, wall thickness of 2.77 mm, inside diameter of 27.86 mm, and a weight of 2.09 kg/m. It is a useful reference for piping design, drafting, estimating, and stainless steel fabrication work.
How to Read the 1 Inch Schedule 10S Pipe Data
NPS 1 and DN25 are nominal size designations rather than direct measurements of the pipe outside diameter. For this pipe, the outside diameter is the fixed dimensional reference shown in the source table, while the schedule identifies the specified wall-thickness series.
Outside diameter, inside diameter, and wall thickness
The outside diameter is commonly used when coordinating pipe with clamps, supports, sleeves, fittings, and layout clearances. The inside diameter is useful when reviewing flow passages and checking connections. Wall thickness is important for fabrication, corrosion allowance reviews, welding details, and specification compliance. These dimensions should be considered together rather than interpreted from the nominal size alone.
What the “S” schedule designation communicates
The “S” designation identifies the stainless steel schedule series referenced by ASME B36.19. It should not be treated as a complete material specification: material grade, product form, manufacturing requirements, inspection requirements, and applicable design conditions must be confirmed separately.
Using the listed pipe weight
The mass-per-length value is useful for estimating, handling, support-load reviews, transport planning, and fabrication takeoffs. The filled-with-water value provides a separate reference for systems where the contained fluid contributes to the operating load. Actual supplied mass can differ because of manufacturing tolerances, grade, finish, and purchasing requirements.
Important design and procurement check
Dimension data alone does not establish allowable pressure, temperature limits, corrosion performance, joining requirements, or code compliance. Before procurement or final design, confirm the material grade, schedule, end preparation, tolerances, certification, and project piping specification. For drafting, coordinate this page with the relevant fitting dimensions, flange dimensions, pipe support details, and the project line list.
Additional Reference Questions
Are NPS 1 and DN25 interchangeable labels?
They are corresponding nominal size designations used in different sizing systems. They help identify the intended pipe size, but they should not be used as a substitute for checking the actual outside diameter and wall thickness in the project reference.
Can the Schedule 10S table be used to select a pipe for any service?
No. The table is a dimensional and weight reference. Service selection also requires review of material grade, fluid, temperature, pressure, corrosion conditions, joining method, and the governing project or piping code.
Why can the delivered pipe weight differ from the table value?
Published or calculated reference weight is based on nominal dimensions. Delivered weight may vary with manufacturing tolerances, material grade, surface condition, length, and supplier practices.
What related references should be checked with this page?
Useful companion references include stainless steel pipe schedules, NPS-to-DN terminology, pipe fittings, flange dimensions, pipe supports, and CAD or DWG drafting resources. Linking these topics helps users move from dimensional lookup to coordinated piping design documentation.