Question 46 QMED05 - Machinist-Pump Technician

The Correct Answer is D **Why option D is correct:** A marine chemist's certificate (often referred to as a "gas-free certificate" or "hot work certificate") is a regulatory and safety document issued after a certified marine chemist tests the atmosphere within a confined space, such as a cargo tank or void space on a tank barge. The primary purpose of this certification is to ensure the spaces are free of flammable vapors, toxic gases, or sufficient oxygen deficiency, thereby making them safe for specific activities (like entry, inspection, maintenance, or hot work such as welding). The certificate explicitly lists the tanks, compartments, or spaces that meet the safety standards for entry (or other specified activities) at the time the certificate was issued. **Why the other options are incorrect:** **A) The number of fire extinguishers required onboard:** This information is related to the vessel's regulatory requirements (e.g., USCG regulations, SOLAS), safety equipment inventory, and operational plans. It is found in the vessel's firefighting plan and safety documentation, not on the marine chemist's atmospheric testing certificate. **B) The barge's stability information:** Stability data (such as hydrostatic curves, tank capacities, and loading instructions) is found in the vessel's Stability Booklet, which is required for the safe operation and loading of the barge. It is completely separate from confined space atmospheric testing. **C) The quality of the barge's cargo:** The marine chemist tests the atmosphere, specifically looking for safety hazards (flammability, toxicity). They do not perform tests to determine the commercial quality, purity, or grade of the cargo being carried or that was previously carried. Cargo quality assurance is handled through independent surveyors and laboratory analysis.