Use this page as a practical reference for Schedule 5S Pipe 2 1/2 Inch (DN65) stainless steel pipe dimensions. It brings together the nominal size designations, outside and inside diameters, wall thickness, pipe weight, and water-filled weight listed in the dimensional data below.
For related design work, compare this entry with the site’s pipe schedules, stainless steel pipe dimensions, pipe fittings, and flange dimensions references. These related resources help confirm how the pipe size connects with fittings, equipment, supports, and fabrication drawings.
Schedule 5S Pipe 2 1/2 Inch (DN65 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 73 mm, an inside diameter (ID) of 68.78 mm, and a wall thickness of 2.11 mm. The listed pipe weight is 3.69 kg/m, while the weight including water is 7.4 kg/m.
Schedule 5S Pipe 2 1/2 Inch (DN65 mm) Dimension Table
| Pipe Size | NPS | DN | Outside Diameter (OD) | Inside Diameter (ID) | Wall Thickness | Weight |
|---|---|---|---|---|---|---|
| Schedule 5S Pipe | 2 1/2 Inch | DN65 | 73 mm | 68.78 mm | 2.11 mm | 3.69 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.
2 1/2 Inch Schedule 5S Pipe Data
- Standard: ANSI/ASME B36.19
- Pipe Type: Stainless Steel Pipe
- NPS: 2 1/2 Inch
- DN: DN65
- OD: 73 mm
- ID: 68.78 mm
- Wall Thickness: 2.11 mm
- Pipe Weight: 3.69 kg/m
- Weight Including Water: 7.4 kg/m
Common Uses of 2 1/2 Inch Schedule 5S Pipe
2 1/2 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 DN65 Pipe Dimensions Matter
Many users search for DN65 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 2 1/2 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 2 1/2 and DN65 Explained
NPS stands for Nominal Pipe Size in inches, while DN stands for Diameter Nominal in metric designation. For this pipe size:
- NPS 2 1/2 = inch-based nominal pipe size
- DN65 = 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 73 mm.
Reference for Schedule 5S Pipe 2 1/2 Inch
This page provides a quick dimensional reference for engineers, piping designers, students, fabricators, and procurement teams looking for Schedule 5S Pipe 2 1/2 Inch (DN65 mm) data in a clear format.
Reference Standard: ANSI/ASME B36.19 stainless steel pipe dimensions.
How to Use This Dimension Reference
The dimension table is useful for checking the physical envelope of the pipe during layout, spool preparation, material takeoff, and CAD coordination. The outside diameter is the key dimensional check for external fit-up, clamps, supports, sleeves, and connections. The inside diameter is relevant when reviewing flow passages, internal clearances, and connected components.
Schedule designation and nominal size should not be treated as substitutes for a complete design review. Confirm the applicable project requirements for pressure, temperature, corrosion allowance, material grade, joining method, and service conditions before selecting the pipe for a system.
Drafting and Procurement Notes
The accompanying DWG can support preliminary drafting and layout coordination for this pipe size. Before issuing a fabrication or construction drawing, check the drawing against the project’s piping specification, connection details, tolerances, and the applicable dimensional reference.
When preparing a material request, identify the pipe by its nominal size and schedule, then confirm the required stainless steel material specification separately. The dimensional designation identifies the pipe geometry; it does not by itself establish every material, pressure, or service requirement.
Useful Related References
- Pipe schedule reference: compare wall-thickness designations across related pipe sizes.
- NPS and DN guide: clarify nominal inch and metric size terminology.
- Pipe fitting dimensions: check elbows, tees, reducers, and other connected components.
- Flange reference: coordinate mating flanges and connection details.
- DWG pipe resources: support CAD-based layout and spool coordination.
Frequently Asked Questions
What does Schedule 5S mean?
Schedule 5S is a thin-wall stainless steel pipe schedule referenced under ASME B36.19. The “S” designation identifies the stainless steel schedule series.
Are NPS 2 1/2 and DN65 the same physical measurement?
NPS 2 1/2 and DN65 are nominal designations for the same pipe size reference. They do not replace checking the actual outside diameter, which is listed in the dimension table.
Why are both pipe weight and weight including water shown?
Pipe weight describes the pipe itself, while weight including water provides a separate reference for the pipe with its internal water contents. The latter can be useful when reviewing support loads and installation planning.
Can the DWG be used directly for fabrication?
The DWG is a drafting reference. Verify its dimensions, connection details, material requirements, and project-specific notes against the approved piping specification before using it for fabrication or construction.