Leak Detection and Repair Flashcards

What is the current EPA annual leak rate threshold that triggers mandatory repair for a commercial refrigeration appliance?

Answer: 20%

Commercial refrigeration appliances must be repaired when the annual leak rate exceeds 20%.

Once a leak exceeding the trigger rate is found, how many days do owners generally have to repair the leak?

Answer: 30 days

Owners must repair leaks exceeding the applicable rate within 30 days of discovery.

A soap-bubble test is best described as which type of leak detection method?

Answer: Direct (visual/physical) method

Soap bubbles are a direct method, revealing escaping gas as visible bubbles.

Which leak detection method involves adding a substance that glows under ultraviolet light?

Answer: Fluorescent dye tracer

Fluorescent dye injected into the system glows under UV light at leak points.

What gas is most commonly used to pressurize a system for leak testing without introducing refrigerant?

Answer: Dry nitrogen

Dry nitrogen is used to pressure-test systems because it is inert and moisture-free.

Why should oxygen never be used to pressurize a refrigeration system for leak testing?

Answer: It can cause a violent explosion when mixed with oil

Oxygen combined with compressor oil under pressure can cause a violent explosion.

If a leak repair attempt fails verification, the owner must do which of the following?

Answer: Conduct a follow-up verification and possibly develop a retrofit/retire plan

Failed repairs require follow-up verification and may require a retrofit or retirement plan.