1. What is Flange Bolt Tightening Torque?

Flange bolt tightening torque refers to the rotational force applied to a bolt to achieve proper clamping force in flange connections. It ensures leak-proof joints and structural integrity in piping systems and mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the flange bolt torque formula:

Where:

• \( T \) — Tightening torque (Nm)
• \( K \) — Torque coefficient (dimensionless)
• \( F \) — Axial force (N)
• \( D \) — Bolt diameter (m)

Explanation: The torque coefficient accounts for friction and other factors that affect the relationship between applied torque and achieved bolt tension.

3. Importance of Proper Torque Calculation

Details: Accurate torque calculation is essential for preventing joint failure, avoiding leaks, ensuring proper sealing, and maintaining structural integrity in pressurized systems.

4. Using the Calculator

Tips: Enter torque coefficient (typically 0.15-0.25 for lubricated bolts), axial force in Newtons, and bolt diameter in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical torque coefficient value?
A: For lubricated bolts, K is typically 0.15-0.25. For dry or non-lubricated bolts, K can range from 0.20-0.30.

Q2: How do I determine the required axial force?
A: Axial force depends on flange rating, gasket type, and operating conditions. Consult engineering standards or manufacturer specifications.

Q3: Why is proper torque important in flange connections?
A: Proper torque ensures adequate gasket compression, prevents leaks, avoids bolt over-tightening (which can cause failure), and maintains joint integrity.

Q4: Should torque values be adjusted for different bolt materials?
A: Yes, different materials have different strength properties. Always consult material specifications and applicable standards.

Q5: How often should torque be checked in flange connections?
A: Torque should be checked during initial assembly and after the first operational thermal cycle. Regular maintenance inspections should include torque verification.