USCG Exam PracticeWatch duties, terminology, and instrumentation
A watchstander is preparing to open a pressurized steam valve for maintenance during the watch. Which sequence of verifications is required before breaking into the system?
- A. Confirm the valve is tagged out, then open slowly to bleed pressure gradually
- ✓ Verify the system is isolated, depressurized, cooled, and tagged out where requiredCorrect
- C. Notify the watch engineer, then open the drain cock to check for pressure before proceeding
- D. Verify the system is depressurized and cooled; tagging out is only required for electrical systems
Why B is correct
NAVEDTRA 14104 §1-2 specifies that before opening any pressurized system, valve, or casing, the watchstander must verify it is isolated, depressurized, cooled, and, where required, tagged out. All four conditions apply to steam systems; omitting any one creates a serious burn or injury hazard.
Cited:NAVEDTRA 14104 §1-2