In an approved simulator or aboard a ship, given access to a main boiler.

Performance requirement

Behavior Standard
The student will: During assessment, the student shall, at a minimum:

Describe purpose of boiler blowdown

Blow down the boiler

Raise water level to top of gage glass

Open bottom blow valve

When water level falls to bottom of glass, secure bottom blow valve


Assessed in EN‑3131 Steam Generators.


  1. Table A-III/1 OICEW-A4.1
  2. NVIC 17-14 Task 4.1.A

See the Assessment Guidelines for additional specifications of behavior and standards.