Use this reference to check the published dimensions and weight for Schedule 80 Pipe 1/4 Inch (DN8) before detailing a small-bore piping system. The page separates nominal identification from measured dimensions so designers, fabricators, and buyers can interpret the table correctly.
For related references, compare this entry with the site’s pipe schedules guide, review general pipe dimensions and terminology, and use the available pipe CAD and DWG resources when preparing drawings.
Schedule 80 Pipe 1/4 Inch (DN8) is a heavy wall steel pipe commonly used in industrial piping systems that require higher strength and thicker pipe walls than lighter schedules. This pipe size is based on ANSI/ASME B36.10 and is widely used in process piping, utility systems, water treatment plants, and mechanical services. For this size, the standard data shows 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.
Schedule 80 Pipe 1/4 Inch (DN8) Dimensions
- Pipe Standard: ANSI/ASME B36.10
- Nominal Pipe Size: 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
What Is Schedule 80 Pipe?
Schedule 80 refers to a pipe wall thickness classification. For the same nominal pipe size, a Schedule 80 pipe has a thicker wall and a smaller inside diameter than lower schedule pipes. This makes it a practical choice for systems that need additional pipe strength, durability, and long-term service performance.
Why 1/4 Inch DN8 Pipe Dimensions Matter
Knowing the exact dimensions of a 1/4 inch Schedule 80 pipe is important for piping design, fabrication, and installation. The outside diameter helps with flange matching, clamps, and supports. The inside diameter affects flow area and system capacity. The wall thickness is important for strength and service conditions, while the pipe weight per meter is useful for transport, lifting plans, and structural support calculations.
Common Uses of Schedule 80 Pipe 1/4 Inch (DN8)
This pipe size is often used in industrial and commercial piping systems such as:
- Water treatment and utility piping
- Process and plant piping systems
- Oil and gas applications
- Instrumentation and small-bore piping
- Mechanical service lines
1/4 Inch Schedule 80 Pipe Data Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1/4 inch | 8 | 13.7 | 7.66 | 3.02 | 0.8 |
Additional Information for Engineers and Buyers
Before selecting this pipe size, it is also important to review the material grade, end type, design pressure, corrosion allowance, operating temperature, and project code requirements. While Schedule 80 defines the dimensional wall category, the final pipe selection should always match the actual service condition and engineering specification.
Note: NPS means nominal pipe size in inches, while DN means diameter nominal in millimeters. These are standard reference sizes used for pipe identification.
How to Read the DN8 Schedule 80 Data
NPS and DN identify the nominal pipe size; neither label should be treated as the measured outside diameter. The outside diameter is the key interface dimension for components such as clamps, supports, sleeves, and compatible fittings. The inside diameter is more directly relevant to flow area and bore clearance.
Schedule describes a wall-thickness category for a nominal pipe size. It is not, by itself, a pressure rating, material grade, corrosion allowance, or complete design specification. Those factors must be checked against the piping class, applicable design code, service fluid, temperature, joining method, and project requirements.
Design and Drafting Checks
- Use the published outside diameter when coordinating fittings, supports, clamps, and penetrations.
- Use the published inside diameter when checking bore continuity, flow calculations, and instrument connections.
- Account for pipe mass in support and handling reviews; contents, insulation, valves, and attached fittings may add load.
- Confirm material, end preparation, dimensional tolerances, and procurement requirements before ordering.
- Check the project piping specification rather than assuming that every Schedule 80 product has the same material or service capability.
When this pipe connects to another component, verify the connection standard and mating dimensions. The pipe fittings reference can help with fitting terminology, while the pipe flanges guide provides a useful starting point for flange-related coordination. The downloadable DWG can support drafting, but the drawing should be checked against the project’s required units, tolerances, and connection details.
Selection Note for Engineers and Buyers
A compact pipe size can still require careful specification because small changes in bore, wall category, material, or connection detail can affect installation and service performance. Treat the dimensions in the table as the controlling local reference for this page, then verify the purchase description and engineering calculations against the governing project documents.
Frequently Asked Questions
What does Schedule 80 mean for 1/4 inch pipe?
Schedule 80 identifies a thicker wall category for this nominal pipe size. Compared with a lighter schedule of the same nominal size, it generally has more wall and less available bore, but the applicable data table should be used for the actual dimensions.
Is DN8 the measured inside or outside diameter?
No. DN8 is a nominal designation used to identify the pipe size. Use the listed outside diameter and inside diameter for layout, connection, and flow-related checks.
Does Schedule 80 alone define the pipe pressure rating?
No. Pressure capability depends on additional factors such as material, temperature, allowable stress, manufacturing requirements, corrosion allowance, joining details, and the governing design code.
Why is pipe weight important in a small-bore system?
Pipe weight contributes to support reactions, handling requirements, transportation planning, and the load carried by connected components. Contents, insulation, fittings, and valves should also be considered where applicable.
Can the DWG file be used directly for fabrication?
The DWG is a drafting reference. Confirm units, connection details, tolerances, material requirements, and project-specific revisions before using it for fabrication or construction.