This reference page provides dimensional and weight data for 1/4 inch Schedule 80S stainless steel pipe, also identified as DN8. Use the table below when checking small-bore layouts, material takeoffs, fitting interfaces, fabrication details, and procurement documents.
For related work, compare this reference with the site’s pages on pipe schedules, NPS and DN designations, stainless steel pipe dimensions, and pipe fittings and flanges. Those references help connect nominal size data with drawing, purchasing, and installation decisions.
Schedule 80S Pipe 1/4 Inch (DN8) is a stainless steel pipe size commonly used in small-bore 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 13.7 mm, an inside diameter of 7.66 mm, a wall thickness of 3.02 mm, and a pipe weight of 0.8 kg/m.
1/4 Inch Schedule 80S Pipe Dimensions
The following values are listed for NPS 1/4 Schedule 80S pipe, which corresponds to DN8 in metric designation.
- Pipe Size: NPS 1/4 Inch
- DN Size: DN8
- Outside Diameter (OD): 13.7 mm
- Inside Diameter (ID): 7.66 mm
- Wall Thickness: 3.02 mm
- Pipe Weight: 0.8 kg/m
- Pipe Weight Including Water: 0.84 kg/m
- Reference Standard: ANSI/ASME B36.19
Schedule 80S Pipe 1/4 Inch (DN8) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 80S | 1/4 Inch | 8 | 13.7 | 7.66 | 3.02 | 0.8 |
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, valves, and support details.
Common Uses of 1/4 Inch Schedule 80S Pipe
1/4 inch Schedule 80S pipe is commonly used in stainless steel piping systems that require good corrosion resistance, dependable wall thickness, and reliable service performance. This size is often selected for very small process lines, utility piping, and installations where standard dimensions are needed for design, fabrication, procurement, and maintenance work.
- Instrument and small-bore piping systems in industrial service
- Utility and service piping for water, air, and general process lines
- Sample lines and auxiliary 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
- Panel and skid piping for compact process 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 spacing, 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 support design, material take-off, welding preparation, transport planning, and installation work. Weight data is also useful for estimating handling loads, while inside diameter affects flow calculations and service capacity review.
NPS 1/4 and DN8 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 1/4 and DN8, which is the standard naming format widely used in piping drawings, isometrics, and procurement specifications.
Conclusion
Schedule 80S Pipe 1/4 Inch (DN8) is listed on the current page with 13.7 mm OD, 7.66 mm ID, 3.02 mm wall thickness, and 0.8 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 nominal designation shown on the page: NPS 1/4 and DN8. Then use the listed outside diameter to check physical fit and layout clearances, the inside diameter to support flow-area review, and the wall thickness to coordinate fabrication and connection details.
The listed weight is useful for material takeoffs, handling reviews, support coordination, and transport planning. When a water-filled condition is relevant, use the separate page value rather than treating the dry pipe weight as the complete operating load.
Important Selection Checks
- Confirm that the pipe schedule matches the project specification and the connected fittings, valves, and instruments.
- Check the material grade, corrosion requirements, joining method, and surface or cleanliness requirements separately; the schedule designation does not define all material properties.
- Do not interpret a schedule designation alone as a pressure rating. Pressure and temperature suitability require project-specific engineering review.
- Verify the applicable dimensions against the current project standard, supplier documentation, and the governing design requirements before fabrication or purchase.
Drafting and Procurement Context
On piping drawings and isometrics, retaining both the nominal designation and schedule helps reduce ambiguity during modeling, spool fabrication, and purchasing. The same information can also be coordinated with CAD/DWG pipe references, fitting selections, bill-of-materials entries, and inspection documentation.
When comparing this page with other pipe-size references, compare like-for-like attributes: nominal size, schedule, material standard, outside diameter, wall thickness, inside diameter, and weight basis. This avoids confusing a nominal designation with an actual measured diameter or substituting data from a different schedule.
Frequently Asked Questions
What does 1/4 inch Schedule 80S pipe mean?
It identifies a stainless steel pipe with the NPS 1/4 nominal designation and the Schedule 80S wall-thickness series. The page also gives the corresponding DN designation as DN8.
Is DN8 the same designation as NPS 1/4?
On this reference page, NPS 1/4 and DN8 identify the same nominal pipe size. They are different naming systems used in piping drawings, specifications, and procurement documents.
What dimensions are listed for this pipe?
The page lists the outside diameter, inside diameter, wall thickness, and pipe weight for the specified size and schedule. Use the data table as the controlling local reference for those values.
Does Schedule 80S establish a pressure rating?
No. A schedule describes a dimensional wall-thickness series; it does not by itself establish allowable pressure or temperature limits. Those limits require review of material, design conditions, joining details, corrosion allowance, and applicable project requirements.
Where can this data be used?
The reference can support preliminary layout, drafting, material takeoffs, procurement checks, support coordination, and fabrication review. Final selection should be verified against the complete project specification and engineering requirements.