1. What is the Bolt Torque Equation?

The bolt torque equation calculates the required torque for proper bolt tightening in flange connections. It ensures adequate clamping force while preventing bolt failure or joint leakage.

2. How Does the Calculator Work?

The calculator uses the bolt torque equation:

Where:

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

Explanation: The equation accounts for the relationship between applied torque, bolt tension, and bolt diameter, with the coefficient K representing friction and other factors.

3. Importance of Bolt Torque Calculation

Details: Proper bolt torque calculation is crucial for ensuring joint integrity, preventing leaks, avoiding bolt failure, and maintaining safety 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.

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 plated bolts, it can range from 0.20-0.35.

Q2: How do I determine the required axial force?
A: Axial force depends on joint design, gasket type, and operating pressure. Consult engineering standards for specific applications.

Q3: Why is accurate torque important for flanges?
A: Proper torque ensures uniform gasket compression, prevents leaks, and maintains joint integrity under operating conditions.

Q4: Should I use the same torque for all bolts?
A: Always follow a cross-tightening pattern and torque bolts in multiple passes to ensure even load distribution.

Q5: What factors affect the torque coefficient?
A: Surface finish, lubrication, thread condition, and material properties all influence the torque coefficient value.