The fixture supply pipe for women's restroom lavatories rated at 2 cwsfu each is what size?

To determine the appropriate size for the fixture supply pipe for women's restroom lavatories rated at 2 cwsfu (consideration of water supply fixture units), it is essential to understand the typical demand for lavatory installations.

Each lavatory is rated at 2 cwsfu, and when sizing the supply piping, plumbing codes typically provide guidelines based on the number of fixture units and the corresponding demand for water. For a lavatory setup, a supply pipe of 1/2 inch is commonly used because it is capable of handling the flow requirements efficiently while minimizing pressure loss. This size allows sufficient water flow for simultaneous use of multiple fixtures without causing significant drops in pressure, thus ensuring adequate performance.

Furthermore, smaller sizes like 1/4 inch would not provide enough volume to meet the demand of the fixtures, especially if multiple sinks are utilized at the same time. Also, larger sizes such as 3/4 inch or 1 inch are generally unnecessary for lavatories, as they could lead to excessive flow and potentially waste water, while also being more costly and cumbersome to install.

By selecting the 1/2 inch size, it strikes a balance between adequate supply capacity and practical installation considerations, making it the most appropriate choice for this application