MS Pipe Size, Thickness & OD-ID Chart in MM – Udhhyog Guide
MS Pipe Size, Thickness & OD-ID Chart in MM – Udhhyog Guide
If you are working in construction, plumbing, fabrication, or engineering, understanding the MS pipe size chart is essential. Mild steel (MS) pipes are widely used for structural and fluid transmission applications, and knowing their size, thickness, and internal dimensions can help ensure safety, efficiency, and cost-effectiveness.
What Are MS Pipes?
MS (Mild Steel) pipes are made from low-carbon steel and are known for their flexibility, weldability, and affordability. These pipes are ideal for:
- Construction frameworks
- Water and sewage lines
- Firefighting systems
- Industrial pipelines
- Furniture and scaffolding
What Do OD, ID, and Thickness Mean?
Each pipe is defined by the following three parameters:
- OD (Outer Diameter): The total width of the pipe from the outside edge to outside edge
- ID (Inner Diameter): The space inside the pipe, used to calculate flow or fit connections
- Wall Thickness: The steel thickness that defines strength and pressure rating
OD-ID Thickness Formula
To calculate the inner diameter (ID) of a pipe, use the following formula:
ID = OD − 2 × Wall Thickness
This formula is crucial for selecting pipe for pressure systems or flow rates.
Standard MS Pipe Size Chart in MM (IS:1239)
| NB (mm) | OD (mm) | Wall Thickness (mm) | ID (mm) | Common Use |
|---|---|---|---|---|
| 15 | 21.3 | 2.6 | 16.1 | Domestic Plumbing |
| 20 | 26.9 | 2.6 | 21.7 | Water/Gas Lines |
| 25 | 33.7 | 3.2 | 27.3 | Fabrication & Frame |
| 32 | 42.4 | 3.2 | 36.0 | Structural |
| 40 | 48.3 | 3.2 | 41.9 | Commercial Use |
| 50 | 60.3 | 3.6 | 53.1 | General Fabrication |
| 65 | 76.1 | 3.6 | 68.9 | HVAC Systems |
| 80 | 88.9 | 4.0 | 80.9 | Industrial |
| 100 | 114.3 | 4.5 | 105.3 | Process Piping |
| 150 | 168.3 | 5.0 | 158.3 | Large Bore |
| 200 | 219.1 | 5.6 | 207.9 | Heavy Drainage |
| 250 | 273.1 | 6.4 | 260.3 | Industrial Flow |
| 300 | 323.9 | 7.1 | 309.7 | Structural Steel |
MS Pipe Wall Thickness – Schedule Chart
MS pipe wall thickness is categorized by Schedule Number (SCH). Here’s a simplified breakdown:
| Nominal Bore | SCH 20 | SCH 40 | SCH 80 | SCH 160 |
|---|---|---|---|---|
| 25 mm | 2.77 | 3.38 | 4.55 | 6.35 |
| 50 mm | 3.91 | 5.54 | 8.56 | 11.07 |
| 100 mm | 4.78 | 6.02 | 8.56 | 15.09 |
| 150 mm | 5.16 | 7.11 | 10.97 | 16.15 |
| 200 mm | 5.54 | 8.18 | 12.7 | 21.95 |
Download full pipe thickness chart (PDF)
Tools to Measure OD, ID & Thickness
- Vernier Calipers: For accurate OD & thickness reading
- Pipe Gauges: Quick visual checks of NB/OD
- Ultrasonic Thickness Gauges: For corrosion checking
Applications of MS Pipes by Size
- 15–32 mm: Water plumbing and residential piping
- 40–80 mm: Furniture, handrails, scaffolding
- 100–300 mm: Industrial piping, supports, drainage
Common Use Case Example
A factory installing a compressed air system may use 50 mm NB MS pipe with SCH 40 thickness. The schedule ensures the pipe can handle the pressure without failure.
Did You Know?
The Indian Standard IS:1239 defines the MS pipe dimensions for medium, heavy, and light classes. It's crucial when buying from certified dealers.
Frequently Asked Questions (FAQ)
- What is the difference between SCH 40 and SCH 80?
- SCH 80 pipes are thicker and used for high-pressure applications. SCH 40 is more common for general purpose.
- What does NB mean in pipe?
- NB means Nominal Bore, which is the inner bore diameter classified by standard.
- Can I use the same pipe for gas and water?
- No. While both may use MS pipes, gas pipes need specific safety ratings and threading.
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