Rhode Island Journeyman Plumber Practice Exam

What is the minimum pitch required for 2 1/2" piping and smaller?

1. 1/8"

2. 1/4"

3. 1/2"

4. 1 1/2"

The correct answer is: 1/4"

The minimum pitch required for 2 1/2" piping and smaller is indeed 1/4". This standard is important because proper drainage relies on the correct slope to facilitate the flow of water and waste. A pitch of 1/4" per foot ensures that there is enough gradient to prevent stagnation and promote efficient drainage, which is critical in plumbing systems to avoid clogs and backups. While smaller pitches, such as 1/8", may be sufficient for some applications, they do not provide the same level of assurance for effective drainage in piping systems where larger diameter pipes are not involved. A steeper pitch, like 1/2", might lead to increased flow velocities that could cause issues such as water hammer or erosion within the pipes. Understanding these standards helps ensure compliance with plumbing codes and promotes the longevity and functionality of the plumbing system as a whole.