1. What is the Flange Bolt Torque Equation?

The Flange Bolt Torque Equation calculates the required torque for flange bolts in FPS (foot-pound-second) units. It is essential for ensuring proper sealing and bolt tension in flange connections.

2. How Does the Calculator Work?

The calculator uses the Flange Bolt Torque Equation:

Where:

• \( T \) — Torque (lb-ft)
• \( K \) — Dimensionless torque coefficient
• \( F \) — Bolt load (lb)
• \( D \) — Bolt diameter (in)

Explanation: The equation calculates the torque required to achieve a specific bolt load, accounting for the bolt diameter and the friction coefficient.

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial for preventing leaks, ensuring joint integrity, and avoiding bolt failure in flange connections.

4. Using the Calculator

Tips: Enter the dimensionless torque coefficient (K), bolt load in pounds (F), and bolt diameter in inches (D). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for K values?
A: K values typically range from 0.1 to 0.3, depending on lubrication and surface conditions.

Q2: Why is torque measured in lb-ft?
A: lb-ft (pound-foot) is a standard unit for torque in the FPS system, representing the force applied at a distance from the pivot point.

Q3: How does bolt diameter affect torque?
A: Larger diameters require higher torque to achieve the same bolt load due to the increased lever arm.

Q4: What factors influence the K value?
A: K is affected by friction, thread condition, lubrication, and surface finish of the bolt and nut.

Q5: Can this equation be used for metric bolts?
A: The equation can be adapted for metric units by converting inputs and results appropriately.