Use this reference when you need to verify the dimensions, wall thickness, and weight of 6 inch Schedule XXS pipe for piping layouts, material takeoffs, fabrication planning, or field checks. The page combines the authoritative local dimension table with practical guidance on how to interpret NPS, DN, outside diameter, inside diameter, and pipe weight.
Because XXS is a heavy-wall designation, the listed dimensions should be reviewed together rather than treated as isolated values. They affect clearance, connection fit-up, support loading, handling, and the selection of compatible fittings and flanges.
Schedule XXS Pipe 6 Inch (DN150) is a heavy-wall steel pipe size used in industrial piping systems, plant construction, high-duty utility lines, and fabrication work. This page provides a practical reference for the main dimensions and weight of 6 inch XXS pipe based on ANSI/ASME B36.10.
For piping engineers, designers, estimators, fabrication teams, and site supervisors, accurate pipe size data is important for layout work, material takeoff, support design, transport planning, and installation checks. This guide presents the essential dimensions in a cleaner format that adds more value than a simple size table.
6 Inch Schedule XXS Pipe Dimensions
- Pipe Size: 6 Inch
- Nominal Diameter: DN150
- Pipe Schedule: XXS (Double Extra Strong)
- Outside Diameter (OD): 168.3 mm
- Inside Diameter (ID): 124.4 mm
- Wall Thickness: 21.95 mm
- Pipe Weight: 79.22 kg/m
- Pipe Weight Including Water: 91.36 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XXS Pipe 6 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 6″ | 150 | 168.3 | 124.4 | 21.95 | 79.22 |
What Does Schedule XXS Mean?
Schedule XXS means Double Extra Strong. It is a heavy-wall pipe designation used for applications that need thicker pipe walls than standard or lighter schedules. A thicker wall affects the inside diameter, pipe weight, fabrication requirements, support loading, and handling during installation.
For a size such as 6 inch DN150 pipe, the jump to XXS creates a much heavier pipe than lighter schedules, so correct dimension and weight data are important for design, lifting, and field work.
Why 6 Inch DN150 XXS Pipe Dimensions Matter
Knowing the exact dimensions of 6 inch Schedule XXS pipe is useful for several engineering and construction tasks:
- Fabrication: OD and wall thickness are needed for cutting, beveling, welding, and fit-up work.
- Support Design: Pipe weight per meter helps engineers check support spacing and structural loads.
- Flow Review: ID is useful for estimating internal flow area and hydraulic performance.
- Transport and Lifting: Heavy-wall pipes require accurate weight data for safer handling and crane planning.
- Schedule Comparison: Engineers often compare XXS with XS, STD, Sch 80, Sch 160, or other heavy-wall options during design review.
Typical Applications of 6 Inch Schedule XXS Pipe
This pipe size may be used in:
- Heavy-duty industrial piping
- High-pressure process systems
- Power and utility projects
- Plant piping works
- Oil and gas facilities
- Custom steel fabrication and spool projects
Engineering Notes
NPS means Nominal Pipe Size, while DN means Diameter Nominal. Although this pipe is called 6 inch, the actual outside diameter is 168.3 mm according to the standard. The inside diameter changes with the pipe schedule because wall thickness changes from one schedule to another.
That means if you compare the same 6 inch pipe in a different schedule, the OD usually stays the same, while the ID, wall thickness, and pipe weight will change.
Reference
The dimension data on this page is based on ANSI/ASME B36.10, which is widely used for steel pipe dimensions in industrial applications.
How to Use This 6 Inch XXS Pipe Reference
Start with the nominal designation to identify the pipe size, then use the outside diameter and wall thickness for physical layout and fabrication checks. The inside diameter is especially important when reviewing clearances, flow passages, valves, and other components connected to the line.
Nominal pipe size is a standardized identification rather than a direct measurement of the outside diameter. DN provides the metric designation for the same nominal size. For drawings and spool work, use the tabulated outside diameter and wall thickness instead of estimating dimensions from the nominal name.
Weight and project planning
The listed pipe weight supports material takeoff, transport planning, lifting studies, and preliminary support-load reviews. The water-inclusive figure is a separate reference for considering the pipe together with an internal water-filled condition. Final support, lifting, and structural decisions still require review of the complete piping arrangement, contents, insulation, valves, fittings, and project requirements.
Fabrication and CAD checks
For fabrication, confirm that the selected fittings, flanges, valves, and weld details match the pipe’s outside diameter and wall thickness. The downloadable DWG can support drafting and layout workflows, but dimensions should be checked against the project specification and the approved fabrication documentation before release for construction.
Related pipe references
For broader design work, connect this page with internal references covering pipe dimensions, pipe schedules, steel pipe fittings, flange dimensions, and CAD/DWG piping resources. These related topics help readers move from nominal size selection to connection, drafting, and installation checks.
Important Verification Note
ANSI/ASME B36.10 provides dimensional reference information for steel pipe, but it does not by itself approve a pipe for a particular service or pressure condition. Confirm material grade, manufacturing requirements, corrosion allowance, design conditions, joining method, and applicable project specifications before using the data for engineering or procurement.
Frequently Asked Questions
What does 6 inch Schedule XXS pipe mean?
It identifies a steel pipe with a 6 inch nominal size and the XXS, or Double Extra Strong, wall designation. The nominal name is not the same as a direct measurement of the outside diameter.
What is the difference between NPS and DN?
NPS is the inch-based Nominal Pipe Size designation, while DN is the metric Diameter Nominal designation. Both identify the nominal pipe size; fabrication drawings should use the tabulated physical dimensions.
Why does the inside diameter matter?
The inside diameter defines the available internal passage. It is relevant to flow review, component clearance, valve selection, cleaning access, and connections to other piping items.
Does XXS affect pipe weight?
Yes. A heavier wall generally means more material per unit length, which affects takeoffs, support loading, transport, lifting, and installation planning. Use the page’s authoritative weight data for project calculations.
Can this dimension data be used to select a pressure-rated pipe?
Not by itself. Dimensional data identifies the pipe geometry, while pressure suitability also depends on material, design conditions, temperature, corrosion allowance, manufacturing requirements, and applicable engineering codes.
Is the DWG file ready for construction?
The DWG is a drafting reference. Check it against the approved project drawings, specifications, dimensional data, and fabrication requirements before using it for construction or procurement.