Which statement about bulkhead isolation valve operation is correct?

Which statement about bulkhead isolation valve operation is correct?

• A. They can be operated from the MR supplying the steam, or the auxiliary MR
• B. They can only be operated from the bridge
• C. They are manual and cannot be operated remotely
• D. They operate automatically without operator input

Answer: (A)

Bulkhead isolation valves are designed for quick, safe shutdown of steam lines from more than one location. The best choice reflects their dual-control capability: you can operate them from the machinery space that supplies the steam or from the auxiliary machinery space. This redundancy ensures you can isolate a line even if one area is inaccessible or unsafe, which is essential for maintaining safety and control of the steam system. These valves are not restricted to the bridge; they’re located in the machinery spaces for direct access to the steam system. They’re also not limited to manual operation with no remote control, since many are equipped for remote actuation, and they aren’t purely automatic—operator input is still used in typical procedures.

Bulkhead isolation valves are designed for quick, safe shutdown of steam lines from more than one location. The best choice reflects their dual-control capability: you can operate them from the machinery space that supplies the steam or from the auxiliary machinery space. This redundancy ensures you can isolate a line even if one area is inaccessible or unsafe, which is essential for maintaining safety and control of the steam system.

These valves are not restricted to the bridge; they’re located in the machinery spaces for direct access to the steam system. They’re also not limited to manual operation with no remote control, since many are equipped for remote actuation, and they aren’t purely automatic—operator input is still used in typical procedures.