New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

How is pipe classified in terms of welding?

1. Seam welded or joint welded

2. Seam welded or seamless

3. Seam welded or composite

4. Welded or non-welded

The correct answer is: Seam welded or seamless

Pipe is classified in terms of welding primarily as seamless or seam welded. Seam welded pipe is manufactured by rolling plates and welding the edge together, which creates a longitudinal seam along the length of the pipe. This type of pipe is often subjected to additional testing to ensure the integrity of the seam. On the other hand, seamless pipe is made from solid round steel and is heated and pushed or pulled over a form until it is shaped into a hollow tube. The absence of a seam means that seamless pipes can offer higher strength and durability under pressure compared to their seam welded counterparts. This classification is particularly significant in various applications where the performance and integrity of the pipe under different conditions, such as high pressure or temperature, are critical. Understanding the distinction between seamless and seam welded pipe is important for professionals in the industry, as it affects the selection of materials for specific projects based on structural requirements and potential stressors.