When sizing indirect wastes, what exception should be taken into account?

When sizing indirect wastes, it's essential to consider that stoppages can be more prevalent in these systems. This is primarily due to the nature of indirect waste systems, which may include trap primers, grease interceptors, and other components that can accumulate debris over time. These systems typically convey liquid waste that can carry solids or can be impacted by factors such as sedimentation.

The increased chance of stoppages must be taken into account during the design and sizing process to ensure that the waste can flow freely without obstructions. This can influence the diameter of the pipes and the slope of the drainage system. By assessing the potential for stoppages and designing with adequate size and slope, you can help mitigate issues that may arise from debris accumulation or insufficient flow.

In comparison, higher flow velocities and the need for larger diameter pipes might also influence design, but they do not directly address the specific challenge of stoppages. Connecting to multiple fixtures primarily deals with the distribution of waste and does not directly relate to the issues of stoppages within indirect waste systems. Therefore, understanding the prevalence of stoppages is critical for ensuring effective and reliable plumbing design for indirect waste systems.