This reference page brings together the key dimensional and weight information for 6 inch Schedule 120 pipe, also identified as NPS 6 and DN150. Use the table for dimensional checks, material takeoffs, piping layouts, fabrication planning, and preliminary support or handling studies.
Because nominal pipe size is not the same as the measured inside diameter, designers and drafters should check the outside diameter, wall thickness, and inside diameter separately. The accompanying DWG resource can also support drawing coordination, provided the dimensions are verified against the project specification and approved design documents.
Schedule 120 pipe 6 inch (DN150) 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 6 Schedule 120 pipe based on ASME B36.10.
6 Inch Schedule 120 Pipe Dimensions
- Nominal Pipe Size (NPS): 6 inch
- Diameter Nominal (DN): DN150
- Outside Diameter (OD): 168.3 mm
- Wall Thickness: 14.27 mm
- Inside Diameter (ID): 139.76 mm
- Pipe Weight: 54.21 kg/m
- Pipe Weight Filled With Water: 69.54 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 120 Pipe 6 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 6 inch | 150 | 168.3 | 14.27 | 139.76 | 54.21 |
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 6 Inch Schedule 120 Pipe
NPS 6 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 6 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.
6 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 6 inch Schedule 120 pipe?
The outside diameter is 168.3 mm.
What is the wall thickness of DN150 Schedule 120 pipe?
The wall thickness is 14.27 mm.
What is the inside diameter of NPS 6 Schedule 120 pipe?
The inside diameter is 139.76 mm.
How much does 6 inch Schedule 120 pipe weigh?
The approximate weight is 54.21 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 120 pipe 6 inch (DN150) has an outside diameter of 168.3 mm, wall thickness of 14.27 mm, inside diameter of 139.76 mm, and a weight of 54.21 kg/m. It is a useful reference for piping design, fabrication, estimating, and heavy-duty industrial engineering work.
How to Read the 6 Inch Schedule 120 Data
NPS 6, 6 inch, and DN150 are size designations used to identify the same nominal pipe size in different conventions. They do not indicate that the measured inside diameter is exactly six inches. For fabrication and layout work, the outside diameter and wall thickness in the data table are the controlling dimensional references shown on this page.
Why the outside diameter and inside diameter differ
For a given nominal pipe size in this schedule series, the outside diameter remains associated with the pipe size while the schedule defines the wall thickness. The inside diameter is therefore smaller than the outside diameter and is affected by the selected wall. This distinction matters when checking clearances, flow-area assumptions, fittings, branch connections, and alignment with adjacent piping components.
Using the weight information in project work
The listed pipe weight is useful for quantity takeoffs, shipping estimates, lifting plans, pipe-rack loading reviews, and preliminary support discussions. The water-filled value should be considered separately from the empty-pipe value when evaluating handling or operating loads. Final support spacing, stress analysis, lifting arrangements, and structural adequacy require project-specific engineering verification.
Relationship to fittings, flanges, and drawings
When this pipe is connected to elbows, tees, reducers, flanges, or valves, confirm that the mating components use compatible nominal size, outside diameter, wall assumptions, end preparation, and pressure-class requirements. A schedule designation alone does not establish the complete material, corrosion allowance, joining method, or pressure design basis.
For broader reference work, this page can be paired with the site’s pipe schedule reference, steel pipe dimensions, pipe weight, flange dimensions, and piping terminology resources. These related topics help readers move from a dimensional lookup to a coordinated piping or drafting check without treating the table as a substitute for the governing project specification.
Additional Questions About 6 Inch Schedule 120 Pipe
Is 6 inch pipe the same as DN150?
They are corresponding nominal size designations used in inch-based and metric-based piping terminology. The nominal designation should still be checked against the published outside diameter and wall thickness before selecting connected components.
Does Schedule 120 define the pipe material?
No. The schedule identifies a wall-thickness series for the referenced steel pipe dimensions. Material grade, manufacturing requirements, testing, corrosion allowance, and service conditions must be confirmed separately from the applicable project documents.
Can the listed weight be used for a final support design?
It can serve as a reference input for preliminary estimates, but final support and structural calculations should also consider operating contents, insulation, valves, fittings, dynamic effects, support arrangement, and applicable design requirements.
What should be checked before using the DWG file?
Confirm the drawing units, dimensional values, revision status, nominal size, wall thickness, connection details, and project drafting requirements. The DWG should be coordinated with the authoritative table and the approved design basis before fabrication or construction use.