Some thin-wall steel tubing is used in refrigeration and air conditioning work.
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Fig. 2-1. A table of copper tube Outside Diameter (OD) sizes and Wall Thicknesses for tubing used in refrigeration work. This tubing is identified as ACR tubing since it is manufactured particularly for air conditioning and refrigeration work. Both the soft and hard drawn sizes conform to the measurements listed in this table. The OD size for this tubing is the actual outside diameter of the tube. |
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Fig. 2-2. Nominal size of copper tubing. Not ordinarily used in connection with refrigerants. It should be noted that OD sizes indicated by dimensions are not the actual tube sizes. Type K-Heavy wall. Available in hard and soft temper. Type L-Medium wall. Avail. able in hard and soft temper. Type M-Light wall. Available in hard temper only. Type K is used where corrosion conditions are severe. Type L is used where conditions may be considered normal. Type M is used for drainage and other non-pressure applications and other services less severe than those for which types K and L are recommended. |
The sizes are practically the same as for copper tubing used in refrigeration work. Connections may be made on steel tubing by using either flared fittings or silver brazed connections. Copper or brass tubing should not be used in connection with R-717 (ammonia refrigerant); steel tubing should be used,