What is the minimum waste pipe size for a floor sink?

The minimum waste pipe size for a floor sink is 2 inches. This size is specified in the plumbing code to ensure that the drainage system can adequately handle the flow of wastewater generated by floor sinks, which are commonly used in areas where water and waste are expected to be drained quickly and efficiently, such as in commercial kitchens or laundries.

A 2-inch pipe provides sufficient capacity for normal flow rates encountered in typical usage scenarios. It also allows for proper venting and avoids issues such as clogs and backups, which could disrupt operations in facilities where these sinks are installed. Proper sizing is crucial as it contributes to the overall efficiency and reliability of the plumbing system, ensuring that it meets health and safety standards necessary for sanitation.

Choosing a larger size is not necessary for many applications, while smaller sizes could lead to insufficient drainage capabilities, thereby not adhering to the plumbing codes meant to protect public health. Therefore, 2 inches is both the adequate and code-compliant minimum for this specific application.