This reference provides a quick way to interpret the dimensional and weight data for 14 inch Schedule 30 pipe, also identified as NPS 14 and DN350. Use the values below when coordinating piping layouts, CAD drawings, material takeoffs, fabrication documents, and preliminary support reviews.
The dimensional table is the controlling reference for this page. The explanatory notes clarify how each value is commonly used without replacing project specifications, material requirements, fabrication tolerances, or engineering checks.
Schedule 30 pipe 14 inch (DN350) is a standard steel pipe size commonly used in piping design, drafting, fabrication, estimation, and industrial layout work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 14 Schedule 30 pipe based on ASME B36.10.
For engineers, designers, estimators, and CAD users, quick access to accurate pipe data helps improve piping layout, support planning, weight checks, transport review, and fabrication coordination during project development.
14 Inch Schedule 30 Pipe Dimensions
- Nominal Pipe Size (NPS): 14 inch
- Diameter Nominal (DN): DN350
- Outside Diameter (OD): 355.6 mm
- Wall Thickness: 9.53 mm
- Inside Diameter (ID): 336.54 mm
- Pipe Weight: 81.33 kg/m
- Pipe Weight Including Water: 170.23 kg/m
- Standard: ASME B36.10
Schedule 30 Pipe 14 Inch Data Table
| NPS | DN | Outside Diameter (OD) | Wall Thickness | Inside Diameter (ID) | Weight |
|---|---|---|---|---|---|
| 14 inch | DN350 | 355.6 mm | 9.53 mm | 336.54 mm | 81.33 kg/m |
Understanding 14 Inch Schedule 30 Pipe
14 inch Schedule 30 pipe is a standard steel pipe size used as a reference in industrial piping layouts, utility systems, water transmission lines, process design studies, and CAD drafting. With an outside diameter of 355.6 mm and a wall thickness of 9.53 mm, this pipe size is suitable for medium-flow applications where designers need a balance between flow capacity and pipe wall strength.
What Does Schedule 30 Mean?
Schedule 30 refers to the wall thickness series of the pipe. For NPS 14, Schedule 30 gives a wall thickness of 9.53 mm. The schedule affects the inside diameter, total pipe weight, fabrication planning, and compatibility with supports, fittings, and structural loading requirements.
Why These Pipe Dimensions Matter
Accurate pipe dimension data is important for piping layouts, spool drawings, support design, structural load review, and material takeoff. Knowing that this pipe weighs 81.33 kg/m helps with transport estimates, lifting plans, and support loading. If the pipe is filled with water, the total weight increases to 170.23 kg/m, which is useful for operating load calculations and support checks.
Common Uses of DN350 Schedule 30 Pipe
DN350 Schedule 30 pipe may be referenced in industrial utility systems, water transfer lines, plant layout studies, process piping documentation, and engineering design work. It is also useful for piping designers, CAD users, estimators, and procurement teams who need standard steel pipe dimensions for piping systems.
Difference Between NPS 14 and DN350
NPS 14 is the inch-based nominal pipe size designation, while DN350 is the metric nominal diameter reference. Both refer to the same pipe size category on this page. The actual standard outside diameter for this size is 355.6 mm.
How to Use This Data
You can use this page to quickly check:
- pipe outside diameter for layout and clearance
- inside diameter for flow reference
- wall thickness for schedule comparison
- weight per meter for estimation and transport planning
- water-filled weight for support and structural load review
Quick Reference for Schedule 30 Pipe 14 Inch
- Pipe Size: 14 inch
- DN: DN350
- OD: 355.6 mm
- ID: 336.54 mm
- Wall Thickness: 9.53 mm
- Weight: 81.33 kg/m
- Weight Including Water: 170.23 kg/m
- Reference Standard: ASME B36.10
Related Pipe Size Pages
Conclusion
Schedule 30 Pipe 14 Inch (DN350) is an important steel pipe reference for piping design, drafting, estimation, and fabrication work. With its 355.6 mm outside diameter, 9.53 mm wall thickness, and 81.33 kg/m pipe weight, it provides useful dimensional data for engineers and designers who need fast and accurate pipe information.
Note: NPS = Nominal Pipe Size, DN = Diameter Nominal. Dimensions and weights shown here are based on ASME B36.10 steel pipe data.
How to Read the 14 Inch Schedule 30 Data
The outside diameter is the primary envelope dimension for routing, clearances, sleeves, clamps, supports, and connection coordination. It should be checked against adjacent equipment, structural steel, insulation, access paths, and other piping in the layout.
The inside diameter describes the nominal available bore represented by the listed dimensions. It is useful for preliminary flow-area reference, but final hydraulic design also depends on the service, fluid properties, line length, fittings, valves, elevation changes, and the applicable design criteria.
The listed wall thickness identifies the Schedule 30 dimensional series for this nominal size. Schedule designation should not be treated by itself as a pressure rating or as a substitute for checking material grade, corrosion allowance, design temperature, joining method, and the governing piping code.
Using the Weight Information in Project Work
The dry pipe weight can support preliminary material estimates, handling reviews, transport planning, and line-load coordination. The water-filled value is a separate operating-condition reference and can be useful when reviewing support reactions or structural loading.
Final support and structural design should account for the complete installed system, including fittings, valves, flanges, insulation, lining, contents, test conditions, thermal effects, and dynamic or seismic requirements where applicable. The values on this page should therefore be used as reference inputs rather than as a complete design check.
Drafting and Procurement Checks
- Use the outside diameter when checking physical clearances and support interfaces.
- Use the inside diameter as a dimensional reference for preliminary bore and flow discussions.
- Confirm the wall thickness and schedule against the project line class and procurement documents.
- Coordinate the pipe data with fittings, flanges, valves, branches, and joining details before issuing fabrication drawings.
- Keep the dry and water-filled weight references clearly separated in load and material calculations.
Frequently Asked Questions
What is the difference between NPS 14 and DN350?
NPS 14 is the inch-based nominal pipe size designation, while DN350 is the metric nominal reference for the same pipe size category. Neither designation alone describes the complete wall thickness or material specification.
What does Schedule 30 identify?
Schedule 30 identifies a wall-thickness series for the nominal pipe size. The applicable wall thickness and resulting inside diameter are listed in the dimensional data on this page.
Is Schedule 30 a pressure rating?
No. A schedule describes pipe dimensions; it is not, by itself, a permitted operating pressure. Pressure design requires review of the material, temperature, corrosion allowance, joining details, and applicable code or project specification.
Which dimension should be used for layout clearance?
Use the listed outside diameter for the pipe envelope. Also account for insulation, coatings, supports, fittings, valves, access requirements, and any other items that increase the installed space.
Can the listed inside diameter be used for final flow design?
It can serve as a dimensional reference, but final flow calculations require the complete service and hydraulic design basis. Confirm the selected pipe, fittings, valves, and project requirements before finalizing the line.
Why are two weight conditions shown?
The dry pipe weight and the water-filled weight represent different loading conditions. Select the condition that matches the purpose of the review, and include other attached or contained components when developing final support loads.