Use this reference when you need to identify, specify, or coordinate 1/4 inch Schedule STD pipe in a piping drawing, material take-off, or fabrication package. The page brings together the dimensional data, terminology, application context, and downloadable DWG reference needed for an initial engineering or drafting review.
For broader comparison work, pair this page with related references covering pipe schedules, pipe dimensions, small-bore piping, and pipe fittings and flanges. Those cross-references help confirm that the selected pipe is coordinated with connected components and project documentation.
Schedule STD Pipe 1/4 Inch (DN8) is a steel pipe size commonly used in small industrial and utility piping systems where standard dimensions, structural reliability, and dependable flow capacity are important. Based on the current page data under ANSI/ASME B36.10, this pipe size has an outside diameter of 13.7 mm, an inside diameter of 9.22 mm, a wall thickness of 2.24 mm, and a pipe weight of 0.63 kg/m.
1/4 Inch Schedule STD Pipe Dimensions
The following values are listed for NPS 1/4 Schedule STD 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): 9.22 mm
- Wall Thickness: 2.24 mm
- Pipe Weight: 0.63 kg/m
- Pipe Weight Including Water: 0.69 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule STD Pipe 1/4 Inch (DN8) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| STD | 1/4 Inch | 8 | 13.7 | 9.22 | 2.24 | 0.63 |
What Is Schedule STD Pipe?
Schedule STD means Standard Weight in the IPS pipe system and is commonly referenced for carbon steel and steel pipe dimensions under ASME B36.10. In practical piping work, Schedule STD is used as a standard wall thickness designation for many nominal pipe sizes. It helps engineers, fabricators, and buyers confirm dimensional compatibility, estimate weight, and coordinate with fittings, flanges, supports, and structural loads.
Common Uses of 1/4 Inch Schedule STD Pipe
1/4 inch Schedule STD pipe is commonly used in industrial and utility piping systems where standard steel pipe dimensions are required for small-bore service. This size is often selected for water, utility, sample, and auxiliary lines where reliable dimensional data is important for design, fabrication, and maintenance.
- Instrument and small-bore piping in industrial systems
- Utility service lines for water, air, and general plant service
- Sample and auxiliary piping in process facilities
- Compact skid and package unit piping where small steel pipe is required
- Maintenance and replacement work using standard pipe dimensions
- Workshop and fabrication projects needing standard steel pipe data
- Low-volume distribution lines in utility systems
- General steel piping applications where DN8 pipe is specified
In practical engineering work, this pipe size may be reviewed when checking flow capacity, support spacing, transport weight, and installation planning. Final pipe selection should always be verified against project pressure, temperature, fluid type, corrosion allowance, 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, transport planning, welding preparation, and installation work. For a pipe size such as 1/4 inch DN8, accurate weight data is useful for fabrication planning and small-bore piping layout. Inside diameter is also important for 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, specifications, and procurement documents.
Conclusion
Schedule STD Pipe 1/4 Inch (DN8) is listed on the current page with 13.7 mm OD, 9.22 mm ID, 2.24 mm wall thickness, and 0.63 kg/m weight. It is a useful steel pipe reference for engineers, designers, and buyers who need standard dimensional and weight data for small piping systems and project coordination.
How to Use This Pipe Reference
Begin with the dimensional list and table when checking a drawing, purchase description, or replacement item. Outside diameter is especially important for fitting interfaces, clamps, sleeves, and layout clearances. Inside diameter supports flow-area and service-capacity reviews, while wall thickness is used in fabrication, welding, and dimensional checks.
The listed weight can support material take-offs, handling plans, and preliminary support-load coordination. It should not be treated as a complete design basis: final support, pressure, temperature, corrosion, and material checks must follow the applicable project requirements and engineering review.
Drafting and Procurement Checks
- Match the NPS and DN designations between the drawing, specification, and purchase documentation.
- Confirm that the pipe schedule is compatible with the selected fittings, valves, flanges, and connection details.
- Use the OD for physical layout and interface checks rather than relying only on the nominal size label.
- Review the ID when service flow, instrument connections, or internal access requirements are relevant.
- Check the downloadable DWG against the project drafting workflow before incorporating it into a controlled drawing.
For related design work, internal links to pipe schedule definitions, NPS and DN conversion guidance, butt-weld fitting dimensions, and steel pipe flange references would provide useful next steps without duplicating the source table.
Important Scope Note
Schedule designation identifies a dimensional configuration; it does not by itself establish allowable pressure, temperature service, corrosion performance, or material grade. Confirm those requirements separately using the project specification, applicable design rules, and the pipe material documentation.
Frequently Asked Questions
What does Schedule STD mean?
Schedule STD means Standard Weight in the inch-based IPS pipe system. It is used as a standardized wall-thickness designation and helps coordinate pipe dimensions with fittings, flanges, supports, and procurement documents.
Are NPS and DN the same designation?
NPS and DN are different nominal designation systems. This page identifies the pipe as NPS 1/4 and DN8; always retain the designation format required by the project drawing or purchasing specification.
Why are both outside and inside diameter listed?
Outside diameter supports layout, fitting, clamp, and interface checks. Inside diameter is relevant to flow-area reviews and service-capacity calculations. Both dimensions help prevent errors caused by using the nominal size alone.
Can the listed pipe weight be used for structural design?
The listed weight is useful for preliminary take-offs, handling, and coordination. Structural or support design also requires the applicable contents, insulation, attachments, load cases, and project design criteria.
What should be checked before selecting this pipe for service?
Verify pressure, temperature, fluid type, corrosion allowance, material requirements, connection compatibility, and applicable project specifications. The dimensional table should be used with—not instead of—those engineering checks.
What is the DWG file useful for?
The downloadable DWG can support drafting, layout coordination, and reference work. Review its geometry and layer conventions within the project workflow before using it in a controlled design deliverable.