A 2" Sch 80 weld certification qualifies you for what pipe size?

A 2" Schedule 80 weld certification qualifies you for piping applications that have a maximum nominal pipe size up to 4" as long as the wall thickness does not exceed double that of the Schedule 80 pipe. Schedule 80 pipe has specific wall thickness dimensions, and the certification allows for a variance in pipe size based on that thickness.

When the certification references the "wall thickness doubles," it indicates that while the nominal size of pipe you’re qualified to weld may increase up to 4", the wall thickness must remain within the doubling limit compared to what you are certified for at 2". This principle helps ensure the integrity and safety of welded joints, especially in high-pressure applications.

Clarifying why the other options do not apply, being qualified for up to 10" is beyond the constraints of the certification and disregards the importance of wall thickness, which is a critical factor in high-pressure piping. Similarly, claiming "unlimited" does not consider the necessary adherence to wall thickness specifications, which is vital for safe and effective welding practices.