New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

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What sizes are Type K, L, and M tubes based on?

The actual ID measurement
The actual OD measurement
Wall thickness
Length of tube

The correct answer is: The actual OD measurement

Type K, L, and M copper tubing designations are based on the actual outside diameter (OD) measurement of the tube. This standardization is crucial for ensuring compatibility with fittings and other components in plumbing and heating systems. The sizes are specified in terms of OD, making it easier for professionals to select the appropriate tubing for their applications without the need to account for variations in wall thickness. Option A refers to inside diameter (ID) measurements, which are not used as the basis for these tubing types. While wall thickness is a factor in determining the strength and application of the tubing, it does not define the size category itself, which relies on the OD. The length of the tube, while important for installation, is unrelated to the classification of the tubing sizes.