Safe Handling and Recovery of Refrigerants Flashcards
7 cards from real EPA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Safe Handling and Recovery of Refrigerants flashcards as text
Why should disposable (one-time-use) refrigerant cylinders never be used for recovery?
Answer: They are not designed to be refilled and may rupture
Disposable cylinders lack the construction and valves for refilling, so reusing them for recovery risks rupture and is prohibited by DOT.
When transporting refrigerant cylinders in a service vehicle, how should they be secured?
Answer: Secured in an upright position
Cylinders should be secured upright to prevent movement, valve damage, and leaks during transport.
A technician wants to confirm the identity of refrigerant in an unlabeled recovery cylinder at a known temperature. What is the best field method?
Answer: Compare the cylinder pressure to a pressure-temperature chart after it stabilizes
A pure refrigerant at a stable known temperature will show a pressure matching its saturation value on a P-T chart.
A recovery cylinder at 75°F reads a pressure noticeably higher than the P-T chart value for the refrigerant it contains. What is the most likely cause?
Answer: Noncondensable gases are present
Noncondensables such as air add their partial pressure, raising cylinder pressure above the refrigerant's saturation pressure.
Which release of refrigerant is considered a 'de minimis' release and NOT a violation of the venting prohibition?
Answer: Small releases that occur during good-faith recovery using proper techniques and equipment
De minimis releases are the small unavoidable amounts released while making good-faith attempts to recover refrigerant properly.
When using a system-dependent (passive) recovery method on a small appliance with an inoperative compressor, what helps release refrigerant trapped in the oil?
Answer: Accessing both high and low sides and tapping or heating the compressor
With an inoperative compressor, accessing both sides and tapping or warming the compressor helps release refrigerant dissolved in the oil.
Which group of refrigerants is classified as mildly flammable (A2L) and requires extra handling precautions such as spark-free tools and ignition-source control?
Answer: R-32 and R-454B
R-32 and R-454B are A2L refrigerants with low toxicity and lower flammability, requiring ignition-source precautions.