Rhode Island Journeyman Plumber Practice Exam

What is the maximum flow rate for a lavatory at 60 PSI?

1. 3.5 GPM

2. 5 GPM

3. 7.5 GPM

4. 10 GPM

The correct answer is: 7.5 GPM

To determine the maximum flow rate for a lavatory at 60 PSI, it is essential to refer to plumbing codes and standards that govern fixture flow rates. For lavatory faucets, the maximum flow rate is typically specified to ensure water efficiency and conservation. In many cases, the maximum flow rate for a lavatory faucet is limited to 2.2 gallons per minute (GPM) at 60 PSI. However, when considering flow rates in the context of different applications, some faucets designed for higher performance may allow up to 3.5 GPM. The choice of 7.5 GPM suggests a misunderstanding of the standard guidelines, as it far exceeds typical maximum flow rates established by code. Understanding these standards is crucial for plumbers as they ensure compliance with regulations and promote water conservation practices in plumbing installations. Thus, the answer highlighting 7.5 GPM as a maximum flow rate indicates a need for further clarification on the appropriate limits for lavatory faucets, which should be much lower—consistent with efficiency guidelines.