What is the correct tightening sequence to begin in the torque on a sight glass after the glass is replaced?

• A. A,B,C,J
• B. D,I,C,J
• C. J,D,I,C
• D. C,J,D,I

Answer: (B)

The idea being tested is how to apply even clamping force around a gasket by using a cross or diagonal tightening order. This approach seats the gasket evenly and keeps the sight glass square, reducing the risk of leaks or cracking from uneven pressure. The best sequence starts with one bolt, then tightens the bolt directly opposite it, and finally tightens the two remaining bolts in the opposite-pair order. Tightening opposite bolts first distributes the load across the gasket rather than concentrating it on one side, which helps the gasket compress evenly and prevents distortion of the glass. After this initial cross-pattern snugging, you should apply the final torque in the same cross sequence in small increments up to the specified value. Sequences that tighten adjacent bolts first can pull the assembly out of square and lead to leaks or damage.