1. What is the Bolt Torque Calculation?

The bolt torque calculation determines the appropriate torque value for flange bolts based on the nut factor, bolt load, and bolt diameter. This ensures proper sealing and prevents leakage in flange connections.

2. How Does the Calculator Work?

The calculator uses the bolt torque formula:

Where:

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

Explanation: The formula calculates the required torque to achieve the desired bolt load while accounting for friction and other factors through the nut factor.

3. Importance of Torque Calculation

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

4. Using the Calculator

Tips: Enter the nut factor (typically 0.15-0.25 for lubricated bolts), bolt load in pounds, and bolt diameter in inches. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical nut factor value?
A: For lubricated bolts, the nut factor typically ranges from 0.15 to 0.25. For dry or untreated bolts, it can be higher.

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 measurements.

Q3: How do I determine the appropriate bolt load?
A: Bolt load depends on the flange rating, gasket type, and operating conditions. Consult engineering standards for specific applications.

Q4: Can this calculator be used for metric units?
A: This calculator uses imperial units. For metric calculations, convert values appropriately or use a dedicated metric calculator.

Q5: What are the consequences of incorrect torque?
A: Under-torquing can cause leaks, while over-torquing can damage bolts or flanges, leading to joint failure.