Ammonia Refrigeration Safety Flashcards
7 cards from real CARO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Ammonia Refrigeration Safety flashcards as text
What is the main hazard of isolating a liquid-full section of ammonia pipe between two closed valves?
Answer: Hydrostatic expansion can rupture the pipe as the liquid warms
Trapped liquid expands as it warms and can generate pressures high enough to burst piping or valves.
Why is draining oil from an ammonia system considered a high-risk task?
Answer: Ammonia dissolved in or trapped with the oil can flash and release suddenly
Oil pots can release liquid ammonia that flashes to vapor, so a self-closing valve and proper PPE are required.
What type of valve is recommended on oil drain connections so flow stops if the operator lets go?
Answer: Spring-loaded self-closing (quick-closing) valve
A spring-loaded self-closing valve automatically shuts if the operator releases it during oil draining.
What is the approximate atmospheric boiling point of anhydrous ammonia?
Answer: -28°F (-33°C)
Ammonia boils at about -28°F (-33°C) at atmospheric pressure, which is why liquid contact causes frostbite.
Liquid ammonia contacts a worker's skin. Besides chemical burns, what additional injury is likely?
Answer: Frostbite from rapid evaporation
Liquid ammonia evaporates rapidly and freezes tissue, causing frostbite along with caustic burns.
Which respirator is required when entering an area with an unknown ammonia concentration?
Answer: Self-contained breathing apparatus (SCBA)
Unknown or IDLH atmospheres require supplied air such as SCBA, not air-purifying respirators.
What color code identifies NIOSH air-purifying cartridges for ammonia/methylamine?
Answer: Green
Ammonia/methylamine cartridges are color-coded green.