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
Where should the emergency shutdown control for an ammonia machinery room be located?
Answer: Outside the machinery room, near the principal entrance
Codes require the emergency control switch outside the machinery room so it can be reached without entering a leak area.
Where must ammonia pressure relief valves on a system ultimately discharge?
Answer: To a safe location outdoors per code
Relief discharge must be piped to a safe outdoor location away from people, openings, and air intakes.
IIAR recommends replacing ammonia pressure relief valves at what interval?
Answer: Every 5 years
IIAR guidance calls for replacing relief valves every five years.
What is the typical alarm set point at which machinery room ammonia detectors activate an alarm and emergency ventilation?
Answer: 25 ppm
IIAR 2 requires detection at 25 ppm to activate alarms and machinery room ventilation.
What is the main cause of hydraulic shock in ammonia piping?
Answer: Fast-moving liquid slugs or sudden condensation of vapor in cold liquid
Liquid slugs driven by vapor or rapid condensation collapse can create pressure spikes that rupture piping.
How should ammonia pipe markers identify a line per IIAR Bulletin 114?
Answer: Physical state, pressure level, service abbreviation, and flow direction
IIAR 114 markers show contents, physical state, pressure level, the service abbreviation, and flow direction.
Why is ammonia's strong odor considered a safety advantage?
Answer: It provides warning at concentrations far below dangerous levels
Most people smell ammonia around 5 ppm, giving early warning well below the 300 ppm IDLH.