This reference provides the dimensional data for Schedule 5S Pipe 3/4 Inch (DN20), including outside diameter, inside diameter, wall thickness, and listed weight. Use the table for quick checking during piping layout, estimating, fabrication, and procurement work.
The page also explains how the NPS and DN designations relate, what the “S” schedule designation indicates, and where this pipe data fits into broader pipe schedule, stainless steel pipe, and CAD/DWG reference research.
Schedule 5S Pipe 3/4 Inch (DN20 mm) is a stainless steel pipe size commonly used in industrial piping systems where corrosion resistance and lighter wall thickness are required. This pipe size is typically referenced under ANSI/ASME B36.19, which is the standard used for stainless steel pipe dimensions.
For this size, the pipe has an outside diameter (OD) of 26.7 mm, an inside diameter (ID) of 23.4 mm, and a wall thickness of 1.65 mm. The listed pipe weight is 1.02 kg/m, while the weight including water is 1.44 kg/m.
Schedule 5S Pipe 3/4 Inch (DN20 mm) Dimension Table
| Pipe Size | NPS | DN | Outside Diameter (OD) | Inside Diameter (ID) | Wall Thickness | Weight |
|---|---|---|---|---|---|---|
| Schedule 5S Pipe | 3/4 Inch | DN20 | 26.7 mm | 23.4 mm | 1.65 mm | 1.02 kg/m |
What Is Schedule 5S Pipe?
Schedule 5S is a thin-wall stainless steel pipe schedule listed in ASME B36.19. The “S” designation is commonly used for stainless steel pipe schedules. Compared with heavier schedules, Schedule 5S provides a lighter wall thickness and lower pipe weight, which can help reduce handling effort, support load, and fabrication requirements in suitable applications.
However, pipe schedule selection should always be reviewed against design pressure, temperature, corrosion allowance, project code, and service conditions before final use.
3/4 Inch Schedule 5S Pipe Data
- Standard: ANSI/ASME B36.19
- Pipe Type: Stainless Steel Pipe
- NPS: 3/4 Inch
- DN: DN20
- OD: 26.7 mm
- ID: 23.4 mm
- Wall Thickness: 1.65 mm
- Pipe Weight: 1.02 kg/m
- Weight Including Water: 1.44 kg/m
Common Uses of 3/4 Inch Schedule 5S Pipe
3/4 inch Schedule 5S stainless steel pipe may be used in applications where corrosion resistance, lighter wall thickness, and good flow capacity are needed. Typical uses may include:
- Water treatment and utility piping systems
- Industrial stainless steel process lines
- Low-pressure transfer piping
- Food and beverage production systems
- Chemical and general fabrication projects
Why DN20 Pipe Dimensions Matter
Many users search for DN20 pipe dimensions to verify piping layout, support spacing, fabrication requirements, transport limits, and compatibility with fittings or connected equipment. For this pipe size, accurate dimensions are important for spool coordination, structural checks, and installation planning.
Knowing the correct 3/4 inch Schedule 5S pipe dimensions also helps engineers, designers, estimators, buyers, and students compare this size with other schedules when reviewing wall thickness, internal flow area, and total pipe weight.
NPS 3/4 and DN20 Explained
NPS stands for Nominal Pipe Size in inches, while DN stands for Diameter Nominal in metric designation. For this pipe size:
- NPS 3/4 = inch-based nominal pipe size
- DN20 = metric nominal designation
Although DN is shown in metric form, the actual outside diameter should always be checked from the dimensional standard. For this size, the OD is 26.7 mm.
Reference for Schedule 5S Pipe 3/4 Inch
This page provides a quick dimensional reference for engineers, piping designers, students, fabricators, and procurement teams looking for Schedule 5S Pipe 3/4 Inch (DN20 mm) data in a clear format.
Reference Standard: ANSI/ASME B36.19 stainless steel pipe dimensions.
How to Use This Schedule 5S Pipe Reference
Start with the dimension table when checking clearances, connected fittings, spool drawings, or material takeoffs. The outside diameter is especially important for layout and connection coordination, while the inside diameter and wall thickness support flow-area reviews and fabrication checks.
The listed pipe weight can be used for preliminary handling, transport, and support-load discussions. The separate water-included value represents a different loading condition from the pipe-only value, so the appropriate figure should be selected for the task being performed.
Related Pipe Dimension and CAD References
For broader comparison, review related pipe schedule tables to see how wall thickness and weight vary between schedules. Separate references for NPS and DN designations, stainless steel pipe dimensions, and pipe fittings and flanges can also help confirm connection compatibility.
The downloadable DWG file is useful for drafting workflows and preliminary layout coordination. Before issuing fabrication or construction documents, verify the drawing units, material specification, tolerances, connection details, and project requirements against the governing documents.
Design Verification Reminder
Dimensional data alone does not establish whether a pipe is acceptable for a particular service. Final selection should be checked by the responsible engineer against pressure, temperature, corrosion, joining method, applicable code requirements, and the actual operating environment. Confirm supplier documentation when purchasing or fabricating material.
Frequently Asked Questions
What are the dimensions of 3/4 inch Schedule 5S pipe?
The source table lists the outside diameter, inside diameter, wall thickness, and pipe-only weight for this NPS 3/4 and DN20 entry. Refer to the table above for the authoritative local values.
Are NPS 3/4 and DN20 the same designation?
They are the inch-based and metric nominal designations used for this pipe size. The nominal labels should not be treated as the actual measured outside diameter; dimensional checks should use the listed OD.
What does the “S” mean in Schedule 5S?
The “S” designation identifies a stainless steel pipe schedule in the referenced dimensional system. Schedule selection still requires review of the service conditions and applicable design requirements.
What is the difference between pipe weight and weight including water?
Pipe weight describes the listed pipe-only mass per unit length. Weight including water is a separate loaded condition and should be used only when that operating or analysis condition applies.
Can the DWG file be used for final fabrication?
The DWG is provided as a drafting and reference resource. Confirm dimensions, units, tolerances, material requirements, and connection details before using any drawing for fabrication or construction.