Final answer:
The correct sequence to follow when tightening bolts in a flange includes dropping the gasket, placing all bolts, and tightening them in a cross pattern, ensuring even pressure on the gasket. This should be done in stages based on the manufacturer's torque specifications.
Step-by-step explanation:
The correct sequence of steps to follow when tightening the bolts in a flange is essential to ensure a proper seal and to prevent leaks or damage. Generally, the procedure involves placing a gasket between the flanges to be joined, inserting bolts through the holes of the flanges, and tightening the bolts in a specific pattern to ensure even pressure distribution on the gasket.
- Drop the gasket in the middle of the flange to ensure a seal between the mating surfaces.
- Place all of the bolts in the flange to secure the flange and gasket in place.
- Tighten the bolts in a cross pattern to apply even pressure across the gasket. As the bolts are tightened, the gasket will center itself and establish an even seal.
It is important to tighten the bolts in stages, usually in three steps (hand-tighten, tighten to a specific torque value, and then final check), following the manufacturer's specifications for torque and sequence.