New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

Which of the following is a special application tube?

1. Plastic-coated copper tube

2. Bundled metallic or plastic tube

3. PVC insulated tube

4. Single-walled aluminum tube

The correct answer is: Bundled metallic or plastic tube

A bundled metallic or plastic tube is considered a special application tube because it is designed to accommodate specific needs within piping systems, such as space efficiency and the simultaneous transportation of multiple types of fluids or gases. This type of tube is particularly advantageous in situations where installation space is limited or where there is a need to reduce the number of connections and potential points of failure. This option is distinguished by its capability to combine multiple tubes into a single bundle, which can enhance the efficiency of installation and maintenance. The bundling can also provide protection to the contained tubes from environmental factors, as well as from mechanical damage. Other types of tubes, while useful in certain applications, do not offer the same level of specialization for combined usage. For instance, a plastic-coated copper tube, while protective, primarily addresses corrosion concerns and does not provide the same multi-functionality as bundled tubes. Similarly, PVC insulated tubes are designed for specific electrical applications and do not serve the same purpose as a bundled system. Lastly, single-walled aluminum tubes are typically utilized for their lightweight properties but lack the additional benefits that come with bundling multiple tubes together for special applications.