Use this page as a quick reference when checking 14 inch Schedule 5 pipe dimensions for piping layouts, fabrication drawings, material takeoffs, and coordination work. The table below brings together the nominal size, metric designation, outside and inside diameters, wall thickness, and weight for this pipe entry.
Before using the dimensions for procurement or design, compare the project piping specification with the applicable material, manufacturing, joining, and inspection requirements. The dimensional reference identifies the pipe geometry; it does not by itself establish allowable pressure, service suitability, or structural adequacy.
Schedule 5 Pipe 14 Inch (DN350) is a large steel pipe size commonly used in industrial piping systems that require high flow capacity with a relatively light wall thickness. This pipe size is often used in utility piping, water transfer systems, low-pressure industrial service, and general steel pipe fabrication work.
This dimension data is based on ANSI/ASME B36.10, which is the standard commonly used for carbon steel pipe dimensions.
14 Inch Schedule 5 Pipe Dimensions
- Pipe Schedule: 5
- Nominal Pipe Size: 14 Inch
- DN Size: DN350
- Outside Diameter (OD): 355.6 mm
- Inside Diameter (ID): 347.68 mm
- Wall Thickness: 3.96 mm
- Pipe Weight: 34.34 kg/m
- Pipe Weight Including Water: 129.23 kg/m
- Standard: ANSI/ASME B36.10
Schedule 5 Pipe 14 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 5 | 14 | 350 | 355.6 | 347.68 | 3.96 | 34.34 |
What Is 14 Inch Schedule 5 Pipe?
A 14 inch Schedule 5 pipe is a steel pipe with a nominal size of 14 inches and a relatively thin wall thickness compared with heavier schedules. For this size, the outside diameter is fixed at 355.6 mm, while the inside diameter is 347.68 mm based on a wall thickness of 3.96 mm.
Schedule 5 pipe is often selected when a project needs large flow capacity, reduced pipe weight, and easier handling compared with thicker wall pipes. It is commonly referenced in steel piping design, drafting, fabrication, and material takeoff work.
Where Is Schedule 5 Pipe 14 Inch Used?
This pipe size is commonly used in applications that need large flow capacity with relatively light wall thickness. Typical uses include:
- Water transfer and distribution systems
- Utility and low-pressure industrial piping
- Large process and service lines
- Pipe spool fabrication and layout work
- General steel piping projects
Why Pipe Dimensions Matter
Accurate 14 inch Schedule 5 pipe dimensions are important for piping layout, fabrication, transport planning, support design, and installation work. Engineers and designers often check OD, ID, wall thickness, and weight before selecting supports, fittings, welding details, and handling methods.
The outside diameter is important for matching supports, clamps, and pipe accessories. The inside diameter helps estimate internal flow area and system capacity. The wall thickness affects mechanical strength and specification compliance, while the pipe weight per meter is useful for lifting plans, transport, and structural loading calculations.
14 Inch Schedule 5 Pipe Weight Information
The nominal weight of this pipe size is 34.34 kg/m. When filled with water, the combined weight becomes approximately 129.23 kg/m. This information is useful for pipe support design, structural coordination, and lifting preparation in large piping systems.
Difference Between NPS 14 and DN350
NPS 14 is the inch-based nominal pipe size, while DN350 is the metric designation used in international drawings and specifications. Both terms refer to the same nominal pipe size, and users may search by either inch size or DN format depending on project standards.
Common Search Terms for This Pipe Size
Users may also search for this pipe using related keywords such as 14 inch Schedule 5 pipe dimensions, DN350 Schedule 5 pipe dimensions, 14 inch pipe weight per meter, DN350 pipe dimensions, or DN350 sch 5 pipe dimensions.
Conclusion
Schedule 5 Pipe 14 Inch (DN350) has an outside diameter of 355.6 mm, an inside diameter of 347.68 mm, a wall thickness of 3.96 mm, and a weight of 34.34 kg/m. It is a useful steel pipe reference size for design, drafting, fabrication, and procurement work.
This page provides a quick reference for engineers, drafters, fabricators, and buyers who need reliable 14 inch Schedule 5 pipe dimensions and DN350 pipe dimensions in one place.
How to Read This DN350 Pipe Reference
NPS 14 and DN350 are two naming systems for the same nominal pipe size. NPS is commonly used on inch-based piping documents, while DN is used on metric-oriented drawings and specifications. The nominal designation should not be treated as a direct measurement of the pipe’s actual outside or inside diameter.
For layout and connection work, start with the listed outside diameter. This is the key dimensional reference for checking clearances, supports, clamps, sleeves, and interfacing components. The listed inside diameter is useful for preliminary flow-area comparisons and hydraulic coordination, but final system calculations should also account for fittings, valves, roughness, elevation, and the governing design requirements.
The listed wall thickness describes the pipe entry in the dimensional table. It should be reviewed alongside the project material specification and any requirements for corrosion allowance, manufacturing tolerance, fabrication, or inspection. A schedule designation should not be used as a substitute for a pressure-design calculation.
Using the Weight Data in Design Coordination
The pipe weight per meter can support preliminary handling, transport, and support-coordination work. The water-filled figure is a combined reference for the pipe and water identified in the source data. It should not be treated as the complete operating load where insulation, coatings, lining, fittings, valves, supports, testing contents, or other attached items are present.
For a complete piping review, pair this page with the site’s related pipe schedule dimensions, pipe weight, flange dimensions, butt-weld fitting dimensions, and pipe support references. Those topics help connect the straight-pipe data to spool drawings, connection details, and support layouts.
Drafting and Procurement Checks
- Use the listed OD when coordinating supports, clamps, sleeves, and clearances.
- Use the listed ID and wall thickness when checking preliminary process or fabrication information.
- Confirm that the selected fittings, flanges, valves, and gaskets match the project specification and connection method.
- Use the downloadable CAD resource with a controlled project drawing workflow and verify units before detailing.
- Confirm material grade, length, end preparation, tolerances, and certification requirements with the purchase specification.
Frequently Asked Questions
What is the outside diameter of 14 inch Schedule 5 pipe?
The source table lists the outside diameter as 355.6 mm.
What is the DN designation for NPS 14 Schedule 5 pipe?
The corresponding metric designation shown in this reference is DN350.
Is Schedule 5 a pressure rating?
No. Schedule identifies a pipe wall-thickness designation within the dimensional reference. Pressure suitability must be established from the material, design conditions, applicable code, manufacturing requirements, and project specification.
What is the listed weight of this pipe?
The listed nominal pipe weight is 34.34 kg/m. The source also lists a combined pipe-and-water value of 129.23 kg/m.
Can the table be used to select fittings and flanges?
It can provide the straight-pipe dimensional starting point, especially the outside diameter, but fitting and flange selection must be checked against the applicable component standard, pressure class, material, connection type, and project requirements.
Is the CAD file ready for fabrication without review?
No. Treat the downloadable DWG as a reference resource. Check units, scale, layer content, revision status, connection details, and project-specific requirements before using it for fabrication or construction.