MS Pipe Class C vs B Class – Comparison Guide
MS Pipe Class C vs B Class – Thickness, Weight & Use Comparison
When selecting mild steel (MS) pipes for your project, one of the most important choices is between Class B and Class C. Both are defined under IS 1239 standards in India, but they serve very different purposes based on their thickness, strength, and application suitability.
This guide compares MS pipe Class C vs B Class in terms of:
- Wall thickness & weight
- Pressure suitability
- Applications
- Cost efficiency
What Is the Difference Between Class B and Class C?
The key difference lies in wall thickness and pressure handling. Class C pipes are heavier, stronger, and built for high-pressure or structural applications, while Class B pipes are medium-duty and more economical.
Class B vs Class C – Thickness & Weight Comparison Chart
| Nominal Bore (NB) | Class B (Medium) | Class C (Heavy) |
|---|---|---|
| 15mm (1/2") | 2.65 mm / 1.84 kg/m | 3.25 mm / 2.31 kg/m |
| 25mm (1") | 3.25 mm / 3.22 kg/m | 4.0 mm / 3.84 kg/m |
| 50mm (2") | 3.65 mm / 6.90 kg/m | 4.5 mm / 8.33 kg/m |
| 100mm (4") | 4.5 mm / 16.08 kg/m | 5.4 mm / 18.79 kg/m |
Values are approximate. Always confirm with supplier datasheets.
Pressure & Strength Comparison
| Feature | Class B | Class C |
|---|---|---|
| Wall Thickness | Medium | Thick |
| Pressure Rating | Up to ~8–10 bar | Up to ~12–16 bar |
| Weight per meter | Lighter | Heavier |
| Strength under load | Moderate | High |
| Durability | Good | Excellent |
Application Suitability
| Application | Class B ✅ | Class C ✅ |
|---|---|---|
| House Plumbing (Low Pressure) | ✅ | |
| Agriculture Lines (Pumps) | ✅ | ✅ |
| Fire Fighting (Hydrants) | ✅ | |
| Industrial Pressure Pipelines | ✅ | |
| Fabrication Structures (Frames) | ✅ | ✅ |
| Borewell Casing | ✅ |
Price Comparison
| Class | Cost per KG (Approx) | Cost Efficiency |
|---|---|---|
| Class B | ₹65 – ₹72 | Best for general use |
| Class C | ₹72 – ₹85 | Best for long-term durability & safety |
Pricing may vary by city and thickness. Always check the latest MS pipe price list.
When to Choose Class B?
Choose Class B if your pipeline:
- Carries moderate water flow
- Isn’t under high mechanical or hydraulic stress
- Is used in frames or light structures
- Needs budget control
When to Choose Class C?
Choose Class C if your pipeline:
- Handles high pressure
- Is part of firefighting, steam, or industrial systems
- Requires superior strength
- Will be exposed to stress or outdoor elements
Visual Thickness Example
| Pipe Class | Thickness Feel |
|---|---|
| Class B | Easily bendable by hand (for smaller NB) |
| Class C | Requires tools to bend, very rigid |
Identification Marking
- Class A → Blue band
- Class B → Green band
- Class C → Red band
These are either painted or stickered on the pipe near the ends.
FAQ – MS Pipe Class C vs B Class
Q1. Can I use Class B pipe in place of Class C?
Not recommended. For pressure systems or fire lines, always use Class C for safety.
Q2. Is Class C pipe heavier than Class B?
Yes. Class C has thicker walls and higher weight per meter.
Q3. What is the life difference between Class B and Class C pipe?
Class C usually lasts longer due to its thickness and durability, especially in exposed or demanding environments.
Q4. Is Class C better for welding?
Yes. It handles heat better during welding and reduces deformation.
Related Internal Links
- MS Pipe Class Guide →
- MS Pipe Class C Thickness →
- MS Pipe Weight Chart →
- 2 Inch MS Pipe Weight →
- How MS Pipe Prices Are Calculated →
Conclusion
Choosing between MS pipe Class C vs B Class depends on your system's demands. If you're working on domestic, light-duty projects, Class B offers a good balance of strength and cost. But for industrial, fire-fighting, or pressure pipelines, Class C is the gold standard.
Need MS Pipe in B or C Class?
Udhhyog offers verified Class B and Class C MS pipes at wholesale prices, with MTCs, ISI marks, and PAN India delivery.
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