What fixture unit value is assigned to a service sink?

A service sink is generally assigned a fixture unit value based on its usage and flow characteristics. In plumbing codes, fixture units are a method used to quantify the probable demand for water from a particular plumbing fixture.

The reason a service sink is assigned a value of 3 fixture units is due to its typical use, which includes washing and cleaning tasks that may involve significant water flow. This higher value reflects the expected water usage compared to less active fixtures. It takes into account the frequency of use, the capacity of the sink, and its role in the overall plumbing system of a building.

Fixtures with lower values, such as lavatories or kitchen sinks, would not typically experience the same higher demand rate as a service sink. Hence, 3 fixture units for a service sink accurately captures the anticipated water demand, ensuring that the plumbing system can adequately handle the potential flow without encountering pressure drops or inefficiencies.