Hard drawn copper tubing is commonly used in larger refrigeration systems. What statement concerning its use is true?

Correct Answer: Option A — Hard drawn copper tubing is not easily flared, bent, or swaged, so brazed fittings are commonly used.

Hard drawn copper tubing resists manual flaring, bending, and swaging due to its rigidity and work-hardened state. Consequently, marine refrigeration installations rely on manufactured couplings and silver-brazed fittings to ensure leak-free, high-pressure piping integrity in accordance with marine engineering standards.