Use this reference when checking 14 inch Schedule 120 pipe dimensions for piping layouts, material takeoffs, fabrication documents, and preliminary support or handling studies. The source table provides the controlling dimensional and weight data; the notes below explain how to read that information and what should be verified before procurement or design release.
For related terminology, compare this page with the site’s NPS and DN pipe size guide, pipe schedule reference, and pipe weight resources. These links help readers distinguish nominal size from measured diameter and select the correct dimensional page for another schedule or pipe size.
Schedule 120 pipe 14 inch (DN350) is a heavy-wall steel pipe size commonly used in piping design, fabrication, drafting, and engineering estimation work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 14 Schedule 120 pipe based on ASME B36.10.
14 Inch Schedule 120 Pipe Dimensions
- Nominal Pipe Size (NPS): 14 inch
- Diameter Nominal (DN): DN350
- Outside Diameter (OD): 355.6 mm
- Wall Thickness: 27.79 mm
- Inside Diameter (ID): 300.02 mm
- Pipe Weight: 224.66 kg/m
- Pipe Weight Filled With Water: 295.31 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 120 Pipe 14 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 14 inch | 350 | 355.6 | 27.79 | 300.02 | 224.66 |
What Does Schedule 120 Mean?
Schedule 120 refers to a heavy wall thickness series used for steel pipe under ASME B36.10. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness increases according to the schedule. A thicker wall reduces the inside diameter and significantly increases pipe weight.
Typical Uses of 14 Inch Schedule 120 Pipe
NPS 14 Schedule 120 pipe is commonly referenced for heavy-duty industrial piping systems where high wall thickness is required. It may be used in process piping, plant utility systems, structural loading checks, fabrication work, and engineering applications where pipe strength and wall thickness are more critical than maximum flow area.
Why Pipe Weight Matters
Pipe weight per meter is essential for transport planning, crane lifting studies, support design, structural loading, fabrication estimates, and installation planning. For a 14 inch Schedule 120 pipe, the heavy wall thickness results in much higher installed weight than lighter schedules, so accurate weight data is important for engineering and construction work.
14 Inch Schedule 120 Pipe Calculation Notes
The listed weight is based on standard steel pipe dimensions using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material specification, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 14 inch Schedule 120 pipe?
The outside diameter is 355.6 mm.
What is the wall thickness of DN350 Schedule 120 pipe?
The wall thickness is 27.79 mm.
What is the inside diameter of NPS 14 Schedule 120 pipe?
The inside diameter is 300.02 mm.
How much does 14 inch Schedule 120 pipe weigh?
The approximate weight is 224.66 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 120 pipe 14 inch (DN350) has an outside diameter of 355.6 mm, wall thickness of 27.79 mm, inside diameter of 300.02 mm, and a weight of 224.66 kg/m. It is a useful reference for piping design, fabrication, estimating, and heavy-duty industrial engineering work.
How to Read This 14 Inch Schedule 120 Reference
The nominal designation identifies the pipe size family, while the schedule identifies a wall-thickness series. The outside diameter is associated with the nominal pipe size, and the schedule changes the wall thickness and resulting inside diameter. For that reason, a Schedule 120 selection should not be treated as interchangeable with another schedule simply because both have the same nominal size.
When reviewing the table, check the outside diameter first for layout and connection coordination. Then use wall thickness and inside diameter for clearance checks, flow-area calculations, fabrication details, and compatibility reviews. Weight per meter is especially important when preparing a material takeoff or evaluating lifting, transportation, supports, and structural loads.
Design and Drafting Checks
- Confirm that the selected pipe dimensions match the connected fittings, flanges, valves, and branch components.
- Use the inside diameter shown in the source table when a preliminary flow-area or internal-clearance check is required.
- Account for the listed pipe weight in support, handling, and installation studies, while separately checking contents and other attached components.
- Verify the material specification, manufacturing tolerance, corrosion allowance, joining method, and governing project design code before issuing design or procurement documents.
- Coordinate the accompanying DWG file with the dimensional table and confirm that the drawing matches the project unit system and drafting requirements.
Related Pipe Reference Topics
Readers comparing alternatives may benefit from internal links to pipe wall thickness charts, steel pipe dimensions, flange dimension references, fitting dimensions, and the site’s CAD/DWG pipe resources. These references support cross-checking, but they should not replace the applicable project specification or supplier documentation.
The weight figures are useful for estimation and planning. Actual delivered pipe can differ because of manufacturing tolerances, material requirements, coating or lining, and supplier practice. Treat the source values as dimensional reference data and confirm purchase details with the approved specification.
Additional Questions About 14 Inch Schedule 120 Pipe
Does Schedule 120 identify the pipe material grade?
No. The schedule describes a wall-thickness series for the stated pipe size. Material grade, toughness, corrosion resistance, and other product requirements must be specified separately.
Can the listed pipe weight be used for support design?
It can support preliminary estimating and load identification, but final support design should also consider contents, insulation, valves, fittings, operating conditions, temporary loads, and the applicable engineering requirements.
Is the nominal size the same as the measured inside diameter?
No. Nominal pipe size is a designation used for coordination and standardization. The actual inside diameter depends on the pipe’s outside diameter and wall thickness, as shown in the source data.
What should be checked before using the DWG reference?
Check the drawing’s units, dimensional consistency, revision status, connection details, and compatibility with the approved project specification. Use the source table as the controlling local reference for the values on this page.