An indirect waste smaller than what size should be increased by 1 pipe size?

In Massachusetts plumbing code, indirect waste lines are designed to safely convey waste and potentially hazardous materials without risking contamination of the potable water supply. The requirement to increase the pipe size for indirect waste lines that are smaller than a specific diameter is necessary for ensuring adequate flow and preventing clogs or backflow.

When an indirect waste line is smaller than 1 1/4 inches in diameter, increasing the pipe size by one size ensures that the waste can flow through the pipe more efficiently. This size is particularly significant as it balances the need for a larger diameter to handle the expected volume of waste while maintaining the structural integrity and functionality of the plumbing system.

Pipes that are too small can lead to several issues, including increased pressure within the system, potential blockages, and ultimately a failure to properly dispose of waste. Therefore, adhering to this guideline is vital for maintaining sanitation and functionality within the plumbing system, particularly in settings where indirect waste is involved.