1. What is Bolt Torque Calculation?

Bolt torque calculation determines the appropriate tightening force for bolts in flange connections. Proper torque ensures leak-free joints while preventing bolt failure from over-tightening.

2. How Does the Calculator Work?

The calculator uses the bolt torque formula:

Where:

• \( T \) — Bolt torque (Nm)
• \( K \) — Torque coefficient (dimensionless)
• \( F \) — Bolt tension/force (N)
• \( D \) — Nominal bolt diameter (m)

Explanation: The torque coefficient (K) accounts for friction and varies based on lubrication, thread condition, and material.

3. Importance of Proper Bolt Torque

Details: Correct bolt torque is critical for flange integrity. Under-torque can cause leaks, while over-torque may damage bolts or flanges, leading to joint failure.

4. Using the Calculator

Tips: Enter torque coefficient (typically 0.15-0.25 for lubricated bolts), required bolt force, and nominal bolt diameter. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical torque coefficient value?
A: For lubricated steel bolts, K is typically 0.15-0.20. For dry or plated bolts, it can range from 0.20-0.30.

Q2: How do I determine the required bolt force?
A: Bolt force depends on flange rating, gasket type, and operating conditions. Consult engineering standards like ASME B16.5.

Q3: Should I use metric or imperial units?
A: This calculator uses metric units (Nm, N, m). Convert imperial units before calculation if necessary.

Q4: Why is proper lubrication important?
A: Lubrication reduces friction, providing more consistent torque values and ensuring proper bolt tension is achieved.

Q5: How often should torque calculations be verified?
A: Recalculate whenever conditions change (new gasket, different lubricant, temperature variations) or during routine maintenance.