Rhode Island Journeyman Plumber Practice Exam

What is the required minimum pressure rating for hot water distribution piping?

1. 30 psi

2. 50 psi

3. 50 parts per million of chlorine for 24 hours

4. 100 psi

The correct answer is: 50 parts per million of chlorine for 24 hours

The required minimum pressure rating for hot water distribution piping pertains primarily to the mechanical integrity and safety of plumbing systems. In this context, the correct response identifies a pressure rating instead of addressing a sanitation standard, as water treatment measures like chlorine concentration are not applicable to the pressure requirements for piping. Hot water distribution systems must withstand certain pressures to ensure efficient operation and to prevent failures that could lead to leaks or system outages. The ratings typically discussed are given in psi (pounds per square inch), with standards often set by plumbing codes and regulations. A common regulatory requirement for many plumbing systems states that a minimum pressure rating of either 50 psi or 100 psi is necessary to handle typical operating pressures, as well as unexpected surges that might occur in a plumbing system. The correct focus should be on the mechanical pressure ratings, which directly impact the structural integrity of the pipes used in hot water distribution. Therefore, it’s crucial to recognize that specifying parts per million of chlorine, as listed in one of the choices, is not relevant to the question about pressure ratings for hot water piping systems.