Emergency Procedures for Leaks and Fires Flashcards
6 cards from real A2L practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Emergency Procedures for Leaks and Fires flashcards as text
Upon detecting a significant A2L refrigerant leak in an enclosed space, what should be your FIRST actions?
Answer: Ventilate the area and de-energize all potential ignition sources.
The immediate priorities are to reduce the refrigerant concentration and remove potential ignition sources. Ventilating the area disperses the flammable vapor, while turning off power and removing other ignition sources prevents a fire or explosion.
Why is it critical to know that A2L refrigerants are heavier than air when responding to a leak?
Answer: It means they will accumulate in low-lying areas like pits and basements.
Because they are denser than air, A2L refrigerant vapors will sink and accumulate in the lowest areas, such as basements, crawlspaces, or service pits. This creates a hidden and concentrated flammable hazard that must be specifically checked for.
What is the primary purpose of a permanently installed refrigerant leak detector in a machinery room with A2L equipment?
Answer: To trigger an alarm and/or mechanical ventilation.
The detector is a safety control designed to sense a leak long before it reaches the LFL. When a leak is detected, it should trigger an alarm to warn personnel and activate a mechanical ventilation system to exhaust the refrigerant and keep the concentration at a safe level.
What type of fire extinguisher is most appropriate for a fire involving the release of a flammable A2L refrigerant?
Answer: Class B or ABC (Dry Chemical)
A2L refrigerants are flammable gases, which fall under the category of Class B fires (flammable liquids and gases). A dry chemical extinguisher rated for Class B or, more commonly, Class ABC, is effective at interrupting the chemical reaction of the fire.
If an A2L refrigerant cylinder is being exposed to flames, what is the most significant and immediate hazard?
Answer: The pressure relief device may vent flammable gas, or the cylinder could rupture.
Heating the cylinder will cause the pressure inside to rise dramatically. The cylinder's pressure relief device will likely activate, venting a stream of flammable refrigerant that will intensify the fire. In a worst-case scenario, the cylinder could rupture violently (a BLEVE).
After a leak has been stopped and the area has been thoroughly ventilated, what must be done before re-energizing equipment or resuming hot work?
Answer: Use a combustible gas detector to confirm the concentration is below the LFL.
Ventilation alone is not enough to guarantee safety. A combustible gas leak detector must be used to physically measure the refrigerant concentration in the area, especially in low spots, to confirm it is well below the LFL before any potential ignition sources are reintroduced.