1. What is the Bolt Torque Equation?

The bolt torque equation calculates the required torque for flange bolts based on the friction coefficient, bolt load, and bolt diameter. It ensures proper sealing and prevents leakage in flange connections.

2. How Does the Calculator Work?

The calculator uses the bolt torque equation:

Where:

• \( T \) — Torque (lb-ft)
• \( K \) — Nut factor (dimensionless)
• \( F \) — Bolt load (lb)
• \( D \) — Bolt diameter (in)

Explanation: The equation accounts for the relationship between friction, bolt tension, and diameter to determine the appropriate tightening torque.

3. Importance of Torque Calculation

Details: Proper torque calculation is crucial for ensuring flange integrity, preventing leaks, and maintaining safety in pressurized systems.

4. Using the Calculator

Tips: Enter the nut factor (K), bolt load (F) in pounds, and bolt diameter (D) in inches. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical value for K?
A: The nut factor K typically ranges from 0.15 to 0.25 for lubricated bolts and 0.20 to 0.30 for dry bolts.

Q2: Why divide by 12 in the formula?
A: The division by 12 converts the result from pound-inches to pound-feet, which is the standard unit for torque measurement.

Q3: How accurate is this calculation?
A: The calculation provides a good estimate, but actual torque requirements may vary based on specific conditions, lubrication, and bolt quality.

Q4: Can this formula be used for metric units?
A: Yes, but units must be consistent. For metric, use Newton-meters for torque, Newtons for force, and millimeters for diameter with appropriate conversion.

Q5: What affects the nut factor K?
A: The nut factor is influenced by thread condition, lubrication, surface finish, and material combinations.