USCG Exam PracticeWatch duties, terminology, and instrumentation
Before opening a pressurized system, valve, or casing in the engine room, which sequence of conditions must the watchstander verify?
- ✓ System is isolated, depressurized, cooled, and where required tagged outCorrect
- B. System is depressurized and the watch engineer has been notified
- C. System is tagged out and the chief engineer has given verbal authorization
- D. System is cooled and the engineering log entry has been completed
Why A is correct
NAVEDTRA 14104 §1-2 explicitly states that before opening any pressurized system, valve, or casing, the watchstander verifies it is isolated, depressurized, cooled, and, where required, tagged out. All four conditions are required; omitting any one of them creates a hazard not addressed by the other three alone.
Cited:NAVEDTRA 14104 §1-2