What is the maximum gallons per minute (GPM) that may discharge from a residential sink faucet at 60 PSI flow pressure?

The correct answer is 2 GPM, which is based on the plumbing standards that govern residential sink faucets. At a flow pressure of 60 PSI, a typical kitchen or bathroom sink faucet is designed to have a maximum flow rate capped at 2.2 GPM in order to meet efficiency and conservation requirements. This limit aligns with modern plumbing regulations aimed at reducing water waste while providing adequate flow for normal usage.

The choice of 2 GPM represents a balance between effective water flow for daily tasks, such as washing hands or dishes, and the need for sustainable water use. This design consideration is crucial for water conservation efforts, especially in residential settings where many faucets may be used simultaneously.

Understanding flow rates relative to pressure is also essential in plumbing, as higher pressures can lead to inefficient usage and greater wear on fixtures. Therefore, the specification of 2 GPM at 60 PSI is not just a random figure but rather a guideline rooted in plumbing efficiency and regulatory compliance.