Ensuring secure and leak-proof connections in piping systems starts with proper bolt torque. Incorrect torque can lead to loose fittings or over-tightening, causing damage to the flange and gasket. At Udhhyog, we provide a detailed flange bolt torque chart to guide you in achieving precise and reliable connections for your industrial projects.
Why Flange Bolt Torque Is Crucial
- Leak Prevention: Proper torque ensures a tight seal, preventing fluid or gas leakage.
- Flange Integrity: Over-tightening can warp or crack the flange, compromising its durability.
- Operational Safety: Secure connections prevent failures that can lead to accidents or costly downtime.
- Extended Gasket Life: Applying the right torque minimizes wear and tear on gaskets.
Flange Bolt Torque Chart
The following torque values are for general reference. Always consult the flange manufacturer for specific recommendations.
| Flange Size (inches) | Bolt Diameter (mm) | Torque (Nm) |
|---|---|---|
| 6 | M12 | 75 |
| 12 | M16 | 200 |
| 18 | M20 | 400 |
| 24 | M24 | 800 |
Factors Affecting Torque Values
- Material of Flange: Stainless steel flanges may require different torque than mild steel.
- Gasket Material: Softer gaskets require less torque to avoid compression damage.
- Environmental Conditions: Temperature and pressure can affect torque requirements.
How to Apply Correct Torque
- Use a Calibrated Torque Wrench: Ensure accuracy by using a wrench calibrated to the required torque.
- Tighten Bolts in a Star Pattern: Gradually tighten the bolts in a crisscross pattern to evenly distribute pressure.
- Apply Torque in Stages: Start with 50% of the recommended torque, then increase to 75%, and finally to 100%.
- Recheck Torque After Operation: Retighten bolts as necessary after initial system operation to account for settling.
Types of Flanges and Bolt Torque
Mild Steel (MS) Flanges
- Cost-effective and versatile for low-pressure systems.
Learn More
Galvanized Iron (GI) Flanges
- Offers corrosion resistance for outdoor and moisture-prone environments.
View GI Flanges
Stainless Steel (SS 304 & SS 316) Flanges
- Highly durable and ideal for high-pressure or corrosive environments.
Browse SS 304 Flanges
Check Out SS 316 Flanges
Best Practices for Flange Bolt Tightening
- Use Proper Lubrication: Apply lubricant to the bolt threads to ensure smooth tightening and accurate torque application.
- Inspect Before Installation: Check bolts, nuts, and flanges for defects or damage.
- Maintain Uniform Gasket Compression: Ensure even pressure across the gasket to avoid leaks or damage.
- Monitor Environmental Conditions: For high-temperature or high-pressure environments, consider periodic retightening.
Why Choose Udhhyog?
- High-Quality Flanges: Our flanges are designed to meet rigorous industry standards.
- Expert Support: Get guidance on torque specifications and flange selection.
- Comprehensive Range: From MS to SS flanges, we have solutions for every industry.
- Reliability You Can Trust: Trusted by industries worldwide for quality and performance.
Explore Our Full Range of Products
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