Safety and Compliance Flashcards

How often must most DOT refrigerant recovery cylinders be hydrostatically tested?

Answer: Every 5 years

DOT rules require most refillable recovery cylinders to be hydrostatically retested every five years.

Why does a nitrogen cylinder used for leak testing need a regulator and a relief valve?

Answer: The cylinder holds about 2,000 psi or more, which can rupture system parts

A full nitrogen cylinder holds very high pressure, so a regulator and relief valve are needed to protect the system and the technician.

What PPE should a technician wear when transferring liquid refrigerant?

Answer: Safety glasses and protective gloves

Liquid refrigerant can cause frostbite and eye injuries, so eye and hand protection is required.

What is the correct way to warm a refrigerant cylinder to speed up charging?

Answer: Use a warm water bath or an approved heating blanket

Gentle, controlled heat keeps the cylinder below 125°F, while open flames and uncontrolled heat can rupture it.

Before using the torch to braze or solder a line that held refrigerant, what should the technician do?

Answer: Recover all the refrigerant and purge the line with nitrogen

Any refrigerant left in the line can break down into phosgene and acids under heat, so recover it and purge with nitrogen first.

Which ASHRAE standard covers safety requirements for refrigeration equipment rooms, such as refrigerant sensors and ventilation?

Answer: ASHRAE Standard 15

ASHRAE 15 sets safety requirements for mechanical rooms, including refrigerant detectors, alarms, and ventilation.

What should a technician check before refilling a recovery cylinder?

Answer: The hydrostatic test date and the cylinder's condition

Never refill a cylinder that is out of its test date, dented, or corroded.