1. What is the Flange Bolt Tension Calculation?

The Flange Bolt Tension Calculation determines the axial force (tension) in a bolt based on the applied torque, using the relationship between torque and tension in bolted joints. This is essential for ensuring proper flange sealing and structural integrity.

2. How Does the Calculator Work?

The calculator uses the bolt tension formula:

Where:

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

Explanation: The formula calculates the axial tension force in a bolt based on the applied torque, accounting for the torque coefficient and bolt diameter.

3. Importance of Bolt Tension Calculation

Details: Proper bolt tension is critical for flange joint integrity, preventing leaks, and ensuring structural stability in mechanical assemblies and piping systems.

4. Using the Calculator

Tips: Enter torque in Nm, K factor (typically 0.2 for dry steel, 0.15 for lubricated), and bolt diameter in meters. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for K factor?
A: K factor typically ranges from 0.12 to 0.30 depending on lubrication, surface finish, and material combinations.

Q2: Why is accurate bolt tension important?
A: Proper bolt tension ensures joint integrity, prevents loosening, and maintains sealing pressure in flanged connections.

Q3: How does lubrication affect the K factor?
A: Lubrication reduces the K factor, meaning less torque is required to achieve the same bolt tension compared to dry conditions.

Q4: What units should be used for diameter?
A: Diameter must be in meters (m) for the formula to work correctly with torque in Nm and tension in N.

Q5: Are there limitations to this calculation?
A: This calculation assumes ideal conditions and may not account for friction variations, thread wear, or elastic interactions in bolt groups.