New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

Which type of tube bundle is most suitable for frequent bends or turns?

1. Straight lay bundle

2. Spiral lay bundle

3. Coiled lay bundle

4. Segmented lay bundle

The correct answer is: Spiral lay bundle

The spiral lay bundle is most suitable for frequent bends or turns due to its design, where the tubes are arranged in a helical or spiral pattern around a central axis. This construction allows for greater flexibility when navigating bends and turns, making it ideal for applications where space constraints require the tubing to bend without causing kinks or excessive stress. In contrast, a straight lay bundle consists of tubes that run parallel to each other, which limits its ability to accommodate bends. The coiled lay bundle, while also flexible, tends to be used in applications where a continuous loop is beneficial, rather than sharp or frequent bends. The segmented lay bundle is composed of tubes arranged in distinct segments, making it less adaptable to tight curves. Hence, the spiral configuration of the spiral lay bundle optimally addresses the need for flexibility and maneuverability in tubing applications.