New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What is the primary purpose of still tubing?

1. To allow for easy adjustments during installation

2. To withstand higher temperatures externally than the internal fluids

3. To provide flexibility in routing systems

4. To minimize material costs in piping systems

The correct answer is: To withstand higher temperatures externally than the internal fluids

The primary purpose of still tubing is to provide a structure that is capable of withstanding higher temperatures externally than those of the internal fluids being transported. This characteristic is essential because certain applications may involve heat exposure from external sources, such as high-temperature environments or applications where the system could be subjected to direct sunlight or high ambient temperatures. This ability to withstand higher external temperatures helps maintain the integrity of the tubing and ensures it does not degrade, which could lead to potential leaks or failures in the system. In piping systems, particularly those dealing with high-temperature applications, selecting materials designed for these conditions is crucial in ensuring safety and reliability. The other options, while potentially relevant in various contexts, do not address the fundamental role of still tubing with regard to temperature management. For instance, although still tubing may offer some level of flexibility or cost-effectiveness in specific designs, these attributes are not its primary function. The design and material composition are primarily focused on temperature resilience, making this the correct and most relevant choice.