Which tubing is used for refrigeration piping?

The correct answer is that degreased and dehydrated ACR (Air Conditioning and Refrigeration) tubing is the standard choice for refrigeration piping. This type of tubing is specifically designed for use in refrigeration and air conditioning systems because it is manufactured to be free of contaminants, moisture, and other substances that could compromise the efficiency of the system. The "degreased" aspect ensures that there are no residual oils or substances on the interior of the tubing, while "dehydrated" indicates that any moisture has been removed, which is crucial to avoid the formation of ice or other complications within the refrigerant line.

Using ACR tubing ensures optimal performance and reliability in coolant flow, helping to maintain the efficiency of the system and preventing potential failures. It is also durable and resistant to high pressures typically encountered in these applications.

Other options, while they may have specific uses in different contexts, do not meet the specific requirements for refrigeration piping. Copper tubing is also commonly used in refrigeration, but it is important for the tubing to be appropriately treated (like being degreased and dehydrated) to ensure its suitability. Flexible PVC is not suitable for refrigeration systems due to potential risks of chemical reactions and poor pressure ratings. Black iron pipe, which is often used