What is the minimum discharge pipe size for a sewage pump receiving water closet discharge?

The minimum discharge pipe size for a sewage pump receiving water closet discharge is 2 inches. This size is important to ensure that the sewage is transported effectively and reduces the risk of clogs, which could occur if the pipe is too small. A 2-inch discharge pipe provides a good balance between managing the flow rate and avoiding blockages that can happen with smaller pipe sizes, especially when dealing with solid waste, such as that from a water closet.

Using a smaller diameter could lead to insufficient flow capacity or increased friction loss, hampering the pump's performance and possibly resulting in backup or overflow situations. Therefore, specifying a 2-inch discharge pipe aligns with plumbing codes and best practices to facilitate proper drainage and minimize maintenance issues in sewage systems.