Massachusetts Plumbers Journeyman Practice Exam 2025 - Free Plumber Journeyman Practice Questions and Study Guide

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How should horizontal drainage piping that is larger than three inches in diameter be installed in terms of pitch?

1/16 inch per foot

1/8 inch per foot

The correct pitch for horizontal drainage piping larger than three inches in diameter is typically 1/8 inch per foot. This pitch ensures that solids can effectively move through the pipes without causing blockages while allowing liquids to drain efficiently. Piping with this slope provides a balance that helps maintain flow velocity, minimizing the risk of waste accumulation.

A pitch that is too steep can lead to issues such as the transportation of solids without sufficient liquid, while a pitch that is too shallow may not promote adequate drainage. Therefore, the 1/8 inch per foot pitch is a standard practice in plumbing for larger horizontal drainage pipes to ensure both proper function and efficiency.

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1/4 inch per foot

1/2 inch per foot

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