Final answer:
Piping NPS 2 and above should have welded pipe joints.
Step-by-step explanation:
When it comes to piping, it is important to use the right type of joints for different pipe sizes. As per industry standards, piping with a Nominal Pipe Size (NPS) 2 and below can have threaded or socket weld joints. However, for piping with NPS 2 and above, it is recommended to use welded pipe joints.