Question 66 ONC05 - Master or Mate of LT 200 GRT

The Correct Answer is B. The total number of approved low-velocity water spray ("water-fog") applicators required aboard a tankship is mandated by regulatory bodies, typically specified in international conventions (like SOLAS) or relevant national regulations (like USCG rules, which often align with SOLAS). In the context of standard maritime safety equipment requirements for tankships, particularly concerning firefighting appliances, the required number of portable foam/water applicators (often referred to as water-fog applicators or similar low-velocity devices designed for fighting fires involving oil or chemicals) is **seven (7)**. Specifically, the regulations generally require: 1. **Four (4) approved portable foam applicators** (or low-velocity water spray nozzles) for use in cargo area. 2. **Two (2) additional such applicators** (or devices suitable for generating foam solution or low-velocity water spray) for machinery spaces. 3. **One (1) spare applicator** or device to ensure operational readiness. While specific regulations might phrase the requirements differently (e.g., specifying low-velocity spray versus foam), the generally required minimum total number of these specific low-velocity/foam-type portable firefighting devices required to be carried in addition to standard fire hoses and nozzles is **7**. *** ### Why the Other Options are Incorrect: **A) 4:** This number is typically the requirement for applicators specifically designated for the cargo deck area only, or sometimes the number of fire axes required, but it does not represent the required total number for the entire vessel (including machinery spaces and spares). **C) 10:** This number exceeds the standard minimum requirement set forth by major regulatory bodies for tankship portable low-velocity applicators. A vessel might carry this many voluntarily, but it is not the mandatory minimum total. **D) 11:** This number significantly exceeds the standard minimum requirement and is not the figure stipulated by regulatory codes (such as SOLAS Chapter II-2).