This reference page is intended for engineers, designers, fabricators, estimators, and drafters working with large-diameter steel piping. Use the dimensional table below as the primary local reference for 32 inch Schedule 20 pipe, while the explanatory notes clarify how the data is typically used in layouts, material takeoffs, support studies, and CAD work.
Schedule 20 pipe 32 inch (DN800) is a large-diameter 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 32 Schedule 20 pipe based on ASME B36.10.
32 Inch Schedule 20 Pipe Dimensions
- Nominal Pipe Size (NPS): 32 inch
- Diameter Nominal (DN): DN800
- Outside Diameter (OD): 813 mm
- Wall Thickness: 12.7 mm
- Inside Diameter (ID): 787.6 mm
- Pipe Weight: 250.65 kg/m
- Pipe Weight Filled With Water: 737.59 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 20 Pipe 32 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 32 inch | 800 | 813 | 12.7 | 787.6 | 250.65 |
What Does Schedule 20 Mean?
Schedule 20 refers to a lighter wall thickness series than heavier schedules such as Schedule 40, Schedule 80, or Schedule 160. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness changes according to the schedule. A lighter wall gives a larger inside diameter and lower pipe weight.
Typical Uses of 32 Inch Schedule 20 Pipe
NPS 32 Schedule 20 pipe is commonly referenced in large-diameter industrial piping systems, utility lines, water-related systems, plant layout drawings, and fabrication work where a large flow area is needed with lower wall thickness than heavier pipe schedules.
Why Pipe Weight Matters
Pipe weight per meter is important for transport planning, crane lifting studies, support design, structural loading, fabrication estimates, and installation planning. For a 32 inch pipe, total line weight can still become very high even with a lighter schedule, so accurate data is essential for engineering work.
32 Inch Schedule 20 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 32 inch Schedule 20 pipe?
The outside diameter is 813 mm.
What is the wall thickness of DN800 Schedule 20 pipe?
The wall thickness is 12.7 mm.
What is the inside diameter of NPS 32 Schedule 20 pipe?
The inside diameter is 787.6 mm.
How much does 32 inch Schedule 20 pipe weigh?
The approximate weight is 250.65 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 20 pipe 32 inch (DN800) has an outside diameter of 813 mm, wall thickness of 12.7 mm, inside diameter of 787.6 mm, and a weight of 250.65 kg/m. It is a useful reference for piping design, fabrication, estimating, and industrial engineering work.
How to Read the 32 Inch Schedule 20 Data
The pipe size is identified in two systems: NPS 32 is the nominal inch designation, while DN800 is the nominal metric designation. These labels identify the pipe size family; they are not the same as a direct measurement of the outside or inside diameter. For fabrication and drafting, use the listed OD, wall thickness, and ID rather than assuming that the nominal size is a measured diameter.
OD, Wall Thickness, and ID Relationship
For this pipe size, the outside diameter is held by the nominal size while the schedule identifies the wall-thickness series. The inside diameter is obtained from the outside diameter after accounting for the wall on both sides of the pipe. This relationship is useful when checking clearances, estimating flow area, preparing spool drawings, or coordinating the pipe with fittings and flanges.
Engineering Use of the Weight Data
The listed mass per meter can support preliminary material takeoffs, handling plans, transportation estimates, and pipe-support loading checks. The water-filled value is useful when considering the operating gravity load of a line containing water. Final support and structural decisions should also account for fittings, valves, flanges, insulation, contents, temporary loads, and the applicable project design requirements.
Schedule Selection Is Not a Pressure-Rating Decision
A pipe schedule describes a dimensional wall-thickness series; it does not, by itself, establish an allowable pressure or confirm suitability for a particular service. Pressure design also depends on material specification, temperature, corrosion or erosion allowance, manufacturing requirements, joining method, code rules, and project conditions. Confirm those items before using the table for procurement or final design.
Useful Related Reference Work
- Compare this entry with other pipe schedules when evaluating wall thickness and mass for the same nominal size.
- Use related pipe dimensions and weight tables when preparing a line list, material takeoff, or preliminary support study.
- Check the relevant pipe fittings and flange dimensions before developing connection details or spool drawings.
- Download the supplied DWG reference file for drafting coordination, then verify project-specific tolerances and connection details before fabrication.
Additional Questions About 32 Inch Schedule 20 Pipe
Are NPS 32 and DN800 the same pipe size designation?
They are the inch-based and metric nominal designations used for this pipe size. The dimensional values in the table remain the controlling reference for OD, wall thickness, ID, and weight.
Does Schedule 20 indicate the pipe pressure rating?
No. Schedule 20 identifies a wall-thickness series. Pressure suitability requires a separate engineering check using the material, temperature, design code, service conditions, and other project requirements.
Why is the inside diameter different from the nominal size?
Nominal pipe size is a standardized size designation rather than a direct inside-diameter measurement. The actual ID depends on the listed outside diameter and wall thickness.
What should be included in a pipe support load check?
Begin with the listed pipe mass and consider the contents, fittings, valves, flanges, insulation, operating condition, and applicable temporary or dynamic loads. A qualified engineer should confirm the final support loads and spacing.
Can the DWG file be used directly for fabrication?
The DWG is a reference resource for drafting and coordination. Confirm dimensions, tolerances, material requirements, joint details, and project specifications before releasing any fabrication drawing.