New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

Is Schedule 80 plastic pipe recommended for threading?

1. True

2. False

3. Only for certain applications

4. Depends on local codes

The correct answer is: True

Schedule 80 plastic pipe is not designed or recommended for threading. Typically, plastic pipes, including Schedule 80, are made from materials like PVC or CPVC, which are typically joined using methods such as solvent welding, fusion, or mechanical fittings, rather than threading. The structure of plastic pipes does not accommodate the threading process, which is generally reserved for metal pipes. The ability to thread a pipe requires a level of structural integrity that plastic does not possess, and attempting to thread it can result in cracks or failures. Therefore, while Schedule 80 may be suitable for high-pressure applications due to its thicker walls, it is important to adhere to best practices and manufacturer specifications by avoiding the use of threading procedures with such pipes. Instead, joints and connections should be made using appropriate plastic piping techniques to ensure durability and compliance with industry standards.