Illinois Plumbing Code Practice Exam 2025 - Free Plumbing Code Practice Questions and Study Guide

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What is the minimum slope required for a horizontal drain pipe according to the Illinois Plumbing Code?

1/8 inch per foot

1/4 inch per foot for pipes four inches in diameter or less

The minimum slope required for a horizontal drain pipe according to the Illinois Plumbing Code is indeed 1/4 inch per foot for pipes four inches in diameter or less. This standard is established to ensure proper drainage and to facilitate the movement of wastewater through the piping system.

A slope of 1/4 inch per foot allows for sufficient flow velocity, which helps to prevent sedimentation and the accumulation of debris within the pipe. This gradient is critical for maintaining the integrity of the plumbing system, reducing the risk of blockages and ensuring efficient wastewater transport.

For pipes larger than four inches in diameter, the Illinois Plumbing Code may allow for variations in slope, but for the specified size, the 1/4 inch per foot slope effectively balances the need for adequate drainage without risking undue strain on the pipe's structure.

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1/2 inch per foot

3/8 inch per foot for all sizes of pipes

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