Alabama Contractors License Practice Exam

A 2 inch diameter waste and vent pipe can serve how many fixture units?

1. 3

2. 4

3. 6

4. 12

The correct answer is: 6

A 2-inch diameter waste and vent pipe is typically designed to handle a specific number of fixture units based on plumbing codes and standards. Fixture units are a measure used to determine the load that will be placed on the plumbing system from various fixtures, taking into account factors like usage frequency and likelihood of simultaneous use. In this case, a 2-inch pipe can generally serve a maximum of 6 fixture units. This is based on accepted plumbing codes, which specify that a pipe of this diameter can effectively manage this level of demand without causing issues such as overloading or slow drainage. The design and sizing of pipes ensure that they can adequately accommodate the anticipated flow rates and prevent problems like blockages or inadequate venting. Understanding these specifications is crucial for contractors and plumbers when designing and installing plumbing systems. Proper sizing of pipes according to fixture units prevents potential plumbing failures and promotes efficient drainage and venting systems.