This reference page summarizes the key dimensional and weight information for Schedule 10 pipe 14 inch (DN350). It is intended for engineers, designers, drafters, fabricators, estimators, and procurement teams who need a consistent pipe-size reference during early project work.
Use the data below alongside related references for pipe schedules, NPS and DN sizing, pipe fittings, flanges, and piping drawings. The listed dimensions support layout and quantity work, but project-specific material, fabrication, code, and design requirements should always be checked separately.
Schedule 10 pipe 14 inch (DN350) is a large-diameter steel pipe size commonly used as a reference in piping design, fabrication, drafting, and estimation work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 14 Schedule 10 pipe based on ASME B36.10.
14 Inch Schedule 10 Pipe Dimensions
- Nominal Pipe Size (NPS): 14 inch
- Diameter Nominal (DN): DN350
- Outside Diameter (OD): 355.6 mm
- Wall Thickness: 6.35 mm
- Inside Diameter (ID): 342.9 mm
- Pipe Weight: 54.69 kg/m
- Pipe Weight Filled With Water: 146.99 kg/m
- Reference Standard: ASME B36.10
Schedule 10 Pipe 14 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 14 inch | 350 | 355.6 | 6.35 | 342.9 | 54.69 |
What Does Schedule 10 Mean?
Schedule 10 refers to the wall thickness series of the pipe. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness changes depending on the schedule. A thicker wall generally increases pipe weight and reduces the inside diameter.
Typical Uses of 14 Inch Schedule 10 Pipe
NPS 14 Schedule 10 pipe is commonly used where large flow capacity is needed with relatively lighter wall thickness than heavier schedules. It may be used in water transfer lines, utility systems, low-pressure process piping, drainage applications, and general plant layout or fabrication reference work.
Why Pipe Weight Matters
Pipe weight per meter is important for transport planning, support design, structural loading, fabrication estimates, and lifting calculations. In large-diameter piping systems, total line weight can significantly affect support spacing, installation methods, and project cost.
14 Inch Schedule 10 Pipe Calculation Notes
The listed weight is based on standard steel pipe dimension data using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material grade, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 14 inch Schedule 10 pipe?
The outside diameter is 355.6 mm.
What is the wall thickness of DN350 Schedule 10 pipe?
The wall thickness is 6.35 mm.
What is the inside diameter of NPS 14 Schedule 10 pipe?
The inside diameter is 342.9 mm.
How much does 14 inch Schedule 10 pipe weigh?
The approximate weight is 54.69 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for welded and seamless wrought steel pipe.
Conclusion
Schedule 10 pipe 14 inch (DN350) has an outside diameter of 355.6 mm, wall thickness of 6.35 mm, inside diameter of 342.9 mm, and a weight of 54.69 kg/m. It is a useful reference for piping design, drafting, estimating, and fabrication work.
How to Use This 14 Inch Schedule 10 Reference
The dimensional list and table provide the principal geometry needed for many drafting and estimating tasks. The outside diameter is useful when checking clearances, fitting interfaces, supports, and connection layouts. The wall thickness helps distinguish this schedule from other wall series, while the inside diameter is the relevant dimensional reference for flow-area and internal-clearance assessments.
For takeoff work, the listed pipe weight can be used as a starting point for line-item estimates and handling reviews. The water-filled weight is a separate reference for considering the additional load associated with a filled line. Actual installation loading may also involve fittings, valves, flanges, insulation, contents, supports, and other attached components.
Schedule, Nominal Size, and Actual Dimensions
NPS 14 and DN350 identify the nominal pipe size; they do not represent the measured inside diameter. The schedule identifies the wall-thickness series. For a given nominal size, the outside diameter is retained while changing the schedule changes the wall thickness, inside diameter, and pipe weight.
This distinction is important when comparing pipe with fittings or preparing CAD and DWG layouts. Before using the dimensions for fabrication or procurement, confirm the applicable product specification, manufacturing tolerances, end preparation, and connection requirements. Related site content can also include pipe OD and ID references, flange dimensions, fitting dimensions, and CAD resources for coordinated piping work.
Practical Checking Points
- Use the outside diameter when checking physical envelope and connection alignment.
- Use the inside diameter when reviewing internal passage assumptions or flow-related calculations.
- Use the pipe weight as a reference for estimating, handling, and preliminary support discussions.
- Do not treat schedule designation alone as a complete pressure or structural design basis.
- Confirm material grade, product condition, tolerances, and project specifications before release for construction.
Additional Questions About 14 Inch Schedule 10 Pipe
Does Schedule 10 by itself define the pipe pressure rating?
No. A schedule identifies a wall-thickness series, but allowable pressure and service suitability depend on factors such as material, temperature, manufacturing requirements, joining method, corrosion considerations, and the governing design code.
Why is the nominal size different from the measured inside diameter?
NPS and DN are nominal designations used to organize compatible piping components. The actual inside diameter is derived from the pipe’s outside diameter and wall thickness, so it should be taken from the applicable dimensional reference rather than assumed from the nominal label.
Can this data be used in a CAD or DWG layout?
Yes, the dimensional information is useful for reference geometry, routing, clearance checks, and preliminary drafting. The drawing should still be coordinated with the selected fittings, flanges, end conditions, tolerances, and project specification before fabrication.
What should be checked before ordering this pipe?
Confirm the nominal size and schedule, applicable standard, material grade, seamless or welded construction, length requirements, end preparation, coating or lining needs, inspection requirements, and supplier documentation.