MACS 609 Certification Practice Exam

What type of tank is required for refrigerant transfer?

1. Tanks marked DOT 3AA

2. Tanks marked DOT 4BA

3. Tanks marked DOT 5A

4. Tanks marked DOT 6B

The correct answer is: Tanks marked DOT 4BA

Tanks marked DOT 4BA are specifically designed for the transportation and transfer of various refrigerants. This designation indicates that the tanks can safely hold and maintain the pressure required for gaseous refrigerants, making them suitable for this application. DOT 4BA tanks have a maximum allowable working pressure of 150 psi and are primarily fabricated from materials that are compatible with a wide range of refrigerants, including those used in HVAC and refrigeration systems. The other tank types, while they may have specific uses, are not appropriate for refrigerant transfer. For example, DOT 3AA tanks are primarily used for compressed gases, while DOT 5A tanks are designed for non-liquefied gases. DOT 6B tanks, on the other hand, are used for certain cryogenic substances but may not meet the standards required for safely handling refrigerants at typical operational pressures. Understanding these specifications is crucial for ensuring safety and compliance during refrigerant handling and transportation.