Why is following a proper tightening sequence important when securing a circular flange with multiple bolts?

Why is following a proper tightening sequence important when securing a circular flange with multiple bolts?

• A. To distribute load evenly and prevent warping or leaks
• B. To tighten as quickly as possible
• C. To maximize bolt head height
• D. To ease removal later

Answer: (A)

Even clamping the flange evenly is essential when securing a circular flange with many bolts. Tightening in a deliberate sequence, typically a cross or star pattern, draws the flange together gradually so the clamping force is distributed around the entire circumference. This keeps the flange plane true and the gasket compressed uniformly, which prevents warping, leaks, and uneven bolt loading. If the bolts are tightened in a random order or all at once on one side, the flange can tilt or distort, opening gaps and risking gasket failure. Following the specified final torque in steps (and using any required lubrication) ensures consistent tension for every bolt. The other options don’t address how the load is applied around the flange—speed, bolt head height, or ease of removal don’t achieve the same reliable, uniform seal.

Even clamping the flange evenly is essential when securing a circular flange with many bolts. Tightening in a deliberate sequence, typically a cross or star pattern, draws the flange together gradually so the clamping force is distributed around the entire circumference. This keeps the flange plane true and the gasket compressed uniformly, which prevents warping, leaks, and uneven bolt loading. If the bolts are tightened in a random order or all at once on one side, the flange can tilt or distort, opening gaps and risking gasket failure. Following the specified final torque in steps (and using any required lubrication) ensures consistent tension for every bolt. The other options don’t address how the load is applied around the flange—speed, bolt head height, or ease of removal don’t achieve the same reliable, uniform seal.