This reference page provides the dimensional data needed to identify Schedule 5S Pipe 1 Inch (DN25) in piping layouts, procurement documents, fabrication drawings, and CAD work. Use the table and data summary together when checking the outside diameter, internal opening, wall thickness, and listed pipe weight.
The accompanying DWG resource can support drafting workflows, but dimensional references should still be checked against the project’s approved specifications and the applicable piping standard before fabrication or installation.
Schedule 5S Pipe 1 Inch (DN25 mm) is a stainless steel pipe size commonly used in industrial piping systems where corrosion resistance and lighter wall thickness are required. This pipe size is typically referenced under ANSI/ASME B36.19, which is the standard used for stainless steel pipe dimensions.
For this size, the pipe has an outside diameter (OD) of 33.4 mm, an inside diameter (ID) of 30.1 mm, and a wall thickness of 1.65 mm. The listed pipe weight is 1.29 kg/m, while the weight including water is 2 kg/m.
Schedule 5S Pipe 1 Inch (DN25 mm) Dimension Table
| Pipe Size | NPS | DN | Outside Diameter (OD) | Inside Diameter (ID) | Wall Thickness | Weight |
|---|---|---|---|---|---|---|
| Schedule 5S Pipe | 1 Inch | DN25 | 33.4 mm | 30.1 mm | 1.65 mm | 1.29 kg/m |
What Is Schedule 5S Pipe?
Schedule 5S is a thin-wall stainless steel pipe schedule listed in ASME B36.19. The “S” designation is commonly used for stainless steel pipe schedules. Compared with heavier schedules, Schedule 5S provides a lighter wall thickness and lower pipe weight, which can help reduce handling effort, support load, and fabrication requirements in suitable applications.
However, pipe schedule selection should always be reviewed against design pressure, temperature, corrosion allowance, project code, and service conditions before final use.
1 Inch Schedule 5S Pipe Data
- Standard: ANSI/ASME B36.19
- Pipe Type: Stainless Steel Pipe
- NPS: 1 Inch
- DN: DN25
- OD: 33.4 mm
- ID: 30.1 mm
- Wall Thickness: 1.65 mm
- Pipe Weight: 1.29 kg/m
- Weight Including Water: 2 kg/m
Common Uses of 1 Inch Schedule 5S Pipe
1 inch Schedule 5S stainless steel pipe may be used in applications where corrosion resistance, lighter wall thickness, and good flow capacity are needed. Typical uses may include:
- Water treatment and utility piping systems
- Industrial stainless steel process lines
- Low-pressure transfer piping
- Food and beverage production systems
- Chemical and general fabrication projects
Why DN25 Pipe Dimensions Matter
Many users search for DN25 pipe dimensions to verify piping layout, support spacing, fabrication requirements, transport limits, and compatibility with fittings or connected equipment. For this pipe size, accurate dimensions are important for spool coordination, structural checks, and installation planning.
Knowing the correct 1 inch Schedule 5S pipe dimensions also helps engineers, designers, estimators, buyers, and students compare this size with other schedules when reviewing wall thickness, internal flow area, and total pipe weight.
NPS 1 and DN25 Explained
NPS stands for Nominal Pipe Size in inches, while DN stands for Diameter Nominal in metric designation. For this pipe size:
- NPS 1 = inch-based nominal pipe size
- DN25 = metric nominal designation
Although DN is shown in metric form, the actual outside diameter should always be checked from the dimensional standard. For this size, the OD is 33.4 mm.
Reference for Schedule 5S Pipe 1 Inch
This page provides a quick dimensional reference for engineers, piping designers, students, fabricators, and procurement teams looking for Schedule 5S Pipe 1 Inch (DN25 mm) data in a clear format.
Reference Standard: ANSI/ASME B36.19 stainless steel pipe dimensions.
How to Read the Schedule 5S Pipe Data
The outside diameter is the external dimension used for layout coordination, clamps, supports, clearances, and many fitting interfaces. The inside diameter describes the available flow passage and is also relevant when checking connections to valves, instruments, and other piping components.
Wall thickness describes the pipe section between the outside and inside surfaces. It affects the listed mass, fabrication details, available internal area, and the way the pipe should be reviewed for the service. The table’s weight value is a nominal reference for the pipe itself; the separate water-inclusive value helps indicate how the filled line may affect support and handling evaluations.
Schedule 5S Selection and Design Review
Schedule identifies a dimensional wall category; it is not, by itself, a complete pressure-rating or material-selection decision. Final selection requires review of design pressure, temperature, corrosion allowance, fluid compatibility, joining method, support arrangement, and the governing project code. This is especially important for thin-wall stainless steel pipe, where fabrication and service conditions may control the design.
For related research, link this page with the site’s stainless steel pipe dimensions, pipe schedule comparison, NPS and DN conversion, pipe fittings and flange dimensions, and pipe weight calculation references. These connections help readers move from a dimensional lookup to coordinated component selection without treating nominal size as the actual outside diameter.
Using the DWG Reference
The downloadable DWG is useful for preliminary layout, drafting, and spool coordination. Before issuing a drawing for manufacture, compare the CAD geometry with the approved dimensional source, connected fittings, flange details, tolerances, and project-specific requirements. A drawing file should be treated as a drafting aid rather than a substitute for engineering verification.
Frequently Asked Questions
What does Schedule 5S mean?
Schedule 5S is a stainless steel pipe wall designation associated with the dimensional reference identified on this page. The schedule describes dimensions and should not be used alone to determine allowable service pressure.
Are NPS 1 and DN25 the same actual diameter?
NPS 1 and DN25 are nominal designations for the same referenced pipe size. The actual outside diameter should be taken from the dimensional data rather than inferred from the nominal label.
What is the difference between pipe weight and weight including water?
Pipe weight refers to the listed mass of the pipe. Weight including water represents the listed pipe condition with water inside and is useful when considering filled-line loads, supports, and handling.
Can the DWG file be used as the final fabrication source?
The DWG can assist with layout and drafting, but final fabrication should use approved project documents and verified dimensions for the pipe, fittings, joints, and connected equipment.