This reference page is intended for engineers, drafters, fabricators, estimators, and procurement teams checking NPS 5 Schedule 160 pipe. Use the dimensional table as the primary lookup, then confirm the selected pipe specification, material, manufacturing requirements, and project design basis before issuing fabrication or purchasing documents.
The page also provides practical context for interpreting the outside diameter, wall thickness, inside diameter, and mass data. The accompanying DWG resource can support drafting workflows, but drawings should be checked against the project specification and the applicable component details before use.
Schedule 160 pipe 5 inch (DN125) is an extra 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 5 Schedule 160 pipe based on ASME B36.10.
5 Inch Schedule 160 Pipe Dimensions
- Nominal Pipe Size (NPS): 5 inch
- Diameter Nominal (DN): DN125
- Outside Diameter (OD): 141.3 mm
- Wall Thickness: 15.88 mm
- Inside Diameter (ID): 109.54 mm
- Pipe Weight: 49.12 kg/m
- Pipe Weight Filled With Water: 58.53 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 160 Pipe 5 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 5 inch | 125 | 141.3 | 15.88 | 109.54 | 49.12 |
What Does Schedule 160 Mean?
Schedule 160 refers to an extra 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 much thicker wall reduces the inside diameter and significantly increases pipe weight.
Typical Uses of 5 Inch Schedule 160 Pipe
NPS 5 Schedule 160 pipe is commonly referenced for very heavy-duty industrial piping systems where extremely 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 5 inch Schedule 160 pipe, the extra heavy wall thickness results in much higher installed weight than lighter schedules, so accurate weight data is important for engineering and construction work.
5 Inch Schedule 160 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 5 inch Schedule 160 pipe?
The outside diameter is 141.3 mm.
What is the wall thickness of DN125 Schedule 160 pipe?
The wall thickness is 15.88 mm.
What is the inside diameter of NPS 5 Schedule 160 pipe?
The inside diameter is 109.54 mm.
How much does 5 inch Schedule 160 pipe weigh?
The approximate weight is 49.12 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 160 pipe 5 inch (DN125) has an outside diameter of 141.3 mm, wall thickness of 15.88 mm, inside diameter of 109.54 mm, and a weight of 49.12 kg/m. It is a useful reference for piping design, fabrication, estimating, and heavy-duty industrial engineering work.
How to Use This Schedule 160 Pipe Reference
For piping layout and drafting, the outside diameter is commonly used to coordinate clearances, supports, clamps, sleeves, and connections. The inside diameter is more relevant to flow-area checks, hydraulic calculations, cleaning access, and process design. These dimensions should not be treated as interchangeable.
Nominal size and actual dimensions
NPS 5 and DN125 identify the nominal pipe size; they are not a direct statement of the measured outside or inside diameter. The actual dimensions are the values listed in the page table. This distinction is important when checking pipe against fittings, flanges, valves, supports, and existing plant layouts.
Schedule designation and design verification
Schedule 160 describes a wall-thickness series for steel pipe. It does not, by itself, establish an allowable pressure, temperature limit, corrosion allowance, material grade, or suitability for a particular service. Those decisions require review of the piping specification, design conditions, material requirements, joining method, and applicable engineering rules.
Weight, handling, and connected components
The listed pipe weight is useful for estimating, lifting studies, support reactions, transport planning, and installation reviews. A complete load assessment may also need to account for fluid contents, insulation, coatings, valves, fittings, flanges, supports, and temporary construction loads. Confirm whether the project requires nominal, calculated, or supplier-certified mass data.
Drafting and CAD coordination
The downloadable DWG can help establish a starting geometry for layout work. Before incorporating it into a model or fabrication drawing, verify units, layer conventions, end conditions, tolerances, and compatibility with the connected fittings and piping components. Related PipeSTD references on pipe dimensions, schedules, fittings, flanges, and CAD details can provide useful cross-checks.
Additional Reference Questions
Is Schedule 160 a pressure rating?
No. It is a pipe wall-thickness designation. The allowable pressure and temperature depend on the material, design code, manufacturing requirements, corrosion considerations, and project-specific calculations.
Why should the inside diameter be checked separately from nominal size?
Nominal size is an identification system, while the inside diameter affects flow area and internal clearance. The listed inside diameter should be used when a calculation or layout check depends on the actual bore.
Can this pipe data be used to select fittings or flanges?
It can support preliminary dimensional coordination, but fitting and flange selection also requires checking the applicable standard, pressure class, material, facing, end connection, schedule compatibility, and project specification.
What should be verified before using the DWG file?
Check the drawing units, geometry, connection details, revision status, and compatibility with the project model. Treat the file as a drafting reference and confirm critical dimensions against the approved engineering documents and supplier information.