This reference provides the dimensional data needed to identify and coordinate 4 inch Schedule 80 pipe, also designated DN100. Use the table below when checking pipe layouts, selecting compatible fittings, preparing fabrication drawings, or comparing supplier data. The listed outside diameter, inside diameter, wall thickness, and weight should be read together because each supports a different part of piping design and installation.
Schedule information is only one part of a complete pipe specification. For procurement or design review, coordinate this dimensional reference with the required material grade, end preparation, joining method, service conditions, and project specification. The included DWG resource can also support drafting and preliminary layout work, subject to project-specific verification.
Schedule 80 Pipe 4 Inch (DN100) is a heavy wall steel pipe commonly used in industrial piping systems that require higher strength and thicker pipe walls than lighter schedules. This pipe size is based on ANSI/ASME B36.10 and is widely used in process piping, utility systems, water treatment plants, and mechanical services. For this size, the standard data shows an outside diameter of 114.3 mm, an inside diameter of 97.18 mm, a wall thickness of 8.56 mm, and a pipe weight of 22.32 kg/m.
Schedule 80 Pipe 4 Inch (DN100) Dimensions
- Pipe Standard: ANSI/ASME B36.10
- Nominal Pipe Size: 4 inch
- DN Size: DN100
- Outside Diameter (OD): 114.3 mm
- Inside Diameter (ID): 97.18 mm
- Wall Thickness: 8.56 mm
- Pipe Weight: 22.32 kg/m
- Pipe Weight Including Water: 29.73 kg/m
What Is Schedule 80 Pipe?
Schedule 80 refers to a pipe wall thickness classification. For the same nominal pipe size, a Schedule 80 pipe has a thicker wall and a smaller inside diameter than lower schedule pipes. This makes it a practical choice for systems that need additional pipe strength, durability, and long-term service performance.
Why 4 Inch DN100 Pipe Dimensions Matter
Knowing the exact dimensions of a 4 inch Schedule 80 pipe is important for piping design, fabrication, and installation. The outside diameter helps with flange matching, clamps, and supports. The inside diameter affects flow area and system capacity. The wall thickness is important for strength and service conditions, while the pipe weight per meter is useful for transport, lifting plans, and structural support calculations.
Common Uses of Schedule 80 Pipe 4 Inch (DN100)
This pipe size is often used in industrial and commercial piping systems such as:
- Water treatment and utility piping
- Process and plant piping systems
- Oil and gas applications
- Pump stations and mechanical services
- Heavy-duty industrial pipe networks
4 Inch Schedule 80 Pipe Data Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 4 inch | 100 | 114.3 | 97.18 | 8.56 | 22.32 |
Additional Information for Engineers and Buyers
Before selecting this pipe size, it is also important to review the material grade, end type, design pressure, corrosion allowance, operating temperature, and project code requirements. While Schedule 80 defines the dimensional wall category, the final pipe selection should always match the actual service condition and engineering specification.
Note: NPS means nominal pipe size in inches, while DN means diameter nominal in millimeters. These are standard reference sizes used for pipe identification.
How to Use This 4 Inch Schedule 80 Pipe Reference
The outside diameter is the primary coordination dimension for components that fit around the pipe. It is therefore useful when checking flange interfaces, clamps, supports, sleeves, clearances, and connection details. The inside diameter describes the available internal passage and is relevant to flow calculations, equipment connections, cleaning access, and inspection planning.
Wall thickness helps distinguish this schedule from other wall classifications for the same nominal size. It can affect fabrication details, connection preparation, handling, and the available internal bore. However, schedule designation alone does not establish allowable pressure, corrosion life, material strength, or suitability for a particular service. Those decisions require the applicable material and engineering requirements.
Design and Procurement Checks
- Confirm that the nominal size and DN designation match the project line list and piping specification.
- Check the mating dimensions of flanges, fittings, valves, and other connected components.
- Use the listed pipe weight when reviewing handling, lifting, support, and transport requirements.
- Distinguish dry pipe weight from the listed pipe weight including water when evaluating supported or filled piping.
- Verify material grade, corrosion allowance, operating temperature, design pressure, end type, and applicable project code before purchase or fabrication.
- Review the DWG file against the project coordinate system, connection details, and required fabrication tolerances before issuing drawings.
Related Pipe Reference Topics
This page can be used alongside references for pipe schedules, NPS and DN sizing, flange dimensions, pipe fittings, and CAD/DWG piping resources. These related topics help connect nominal identification with actual interface dimensions and drafting requirements.
Important Limitation
The dimensions shown are reference data for this pipe designation. They should not be treated as a complete pressure design, flexibility analysis, support design, or code-compliance assessment. Final selection should be reviewed against the governing piping specification and by the responsible engineering team.
Frequently Asked Questions
What does Schedule 80 mean for 4 inch pipe?
Schedule 80 identifies a wall-thickness classification for the nominal pipe size. Compared with a lighter schedule of the same nominal size, it generally has a thicker wall and a smaller internal passage. The schedule does not by itself define material grade or allowable design pressure.
Are 4 inch and DN100 the same pipe size?
They are the nominal designations used to identify this pipe size in inch-based and metric naming systems. The actual outside and inside dimensions should be taken from the applicable dimensional reference rather than inferred from the nominal label alone.
Why are both pipe weight and pipe weight including water listed?
The dry pipe weight supports transport, lifting, and support reviews for the pipe itself. The pipe weight including water represents a filled-pipe condition and can be relevant when checking operating supports and structural loads. The actual project load review may also need to account for insulation, coatings, fittings, valves, and other contents.
Does Schedule 80 determine the pressure rating?
No. Schedule identifies a dimensional wall category, not a complete pressure rating. Pressure suitability depends on factors such as material, temperature, corrosion allowance, joining details, code requirements, and the design basis for the piping system.
Can the DWG file be used directly for fabrication?
The DWG is a useful drafting reference for preliminary layout and coordination. Before fabrication, verify the file against the project specification, revision status, connection requirements, tolerances, and the approved engineering drawings.