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A recovery cylinder, which is half full of recovered R-12 at normal room temperature in the absence of non-condensables, will be pressurized to:

A. Approximately 0 psig
B. Approximately 30 psig
C. Approximately 50 psig
D. Approximately 100 psig

Answer :

Final answer:

A recovery cylinder half full of R-12 at room temperature will be pressurized to approximately 30 psig, based on the refrigerant's specific pressure-temperature relationship.

Explanation:

The correct answer is b) Approximately 30 psig

A recovery cylinder which is half full of recovered R-12 at normal room temperature in the absence of non-condensables, will be pressurized to approximately 30 psig. Refrigerants such as R-12, commonly used in refrigeration and air conditioning systems, exhibit specific pressure-temperature relationships. At room temperature (approximately 21°C or 70°F), the pressure of R-12 is about 30 psig. This value can be confirmed by referring to a refrigerant pressure-temperature chart, which lists the corresponding pressures at various temperatures for different refrigerants.

Understanding the pressure-temperature relationship is crucial for technicians working with refrigeration systems to ensure proper system performance and safety. The pressure inside a recovery cylinder should always be monitored to prevent overfilling and potential safety hazards. Always refer to safety standards and refrigerant specifications during handling and recovery processes.

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