Hazardous Materials Management & Containment Flashcards
7 cards from real CMC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Hazardous Materials Management & Containment flashcards as text
Which gas detection instrument is most appropriate for measuring hydrogen sulfide (H₂S) at sub-ppm concentrations in a confined marine space?
Answer: Electrochemical sensor calibrated for H₂S
Electrochemical sensors are specifically designed for toxic gas detection at low ppm and sub-ppm levels, making them ideal for H₂S monitoring.
In a marine environment, a photoionization detector (PID) is primarily used to detect:
Answer: Volatile organic compounds at low concentrations
PIDs ionize molecules with UV light to detect volatile organic compounds (VOCs) at trace concentrations, far below LEL thresholds.
When calibrating a multi-gas detector for confined space work on a tanker, the calibration gas mixture should reflect:
Answer: The specific hazards likely encountered, using certified standard gas
Calibration gas must be a certified standard mixture matching the anticipated hazardous gases to ensure accurate field readings.
A Certified Marine Chemist discovers that a previously certified Safe-for-Hot-Work tank has been disturbed by cargo loading operations. The correct action is to:
Answer: Re-test the atmosphere before issuing a new certificate or extending work
Any significant disturbance that may alter atmospheric conditions invalidates the prior certification, requiring re-testing and re-issuance.
Which personal protective equipment (PPE) level is required when the specific hazardous substances and concentrations in a marine confined space are unknown?
Answer: Level A — fully encapsulating vapor-protective suit with SCBA
Level A provides maximum skin, eye, and respiratory protection and is required when the hazard is uncharacterized or when highest protection is needed.
Emergency eyewash stations on a vessel handling corrosive hazardous materials must be capable of delivering tepid water for at least:
Answer: 15 minutes
ANSI Z358.1 requires emergency eyewash stations to provide a continuous 15-minute supply of tepid flushing fluid.
Under 29 CFR 1910.119 Process Safety Management (PSM), a vessel system containing a highly hazardous chemical above its threshold quantity requires:
Answer: A Process Hazard Analysis (PHA) and written operating procedures
PSM mandates Process Hazard Analysis and written operating procedures for covered processes involving threshold quantities of listed highly hazardous chemicals.