What is the maximum allowable length of a trap arm in Georgia plumbing code?

In the context of plumbing codes, the maximum allowable length of a trap arm is critical to preventing potential issues such as siphoning, odors, and drainage problems. According to Georgia plumbing code, a trap arm can be a maximum of 30 inches. This length ensures that there is sufficient slope for drainage while minimizing the risk of trapping gases or allowing for clog formation.

A trap arm should be installed to maintain an appropriate slope toward the drainage system, typically around a quarter-inch per foot of horizontal run. If the trap arm exceeds the maximum allowable length, it can cause water not to drain properly and lead to a less effective plumbing system.

The other lengths listed are either too short or too long, which may not align with code requirements. For instance, a trap arm length of 24 inches may be acceptable for different fittings or setups, but is less than the maximum allowed. Similarly, lengths of 36 inches and 48 inches exceed what is permitted, making them unsuitable in this context. Thus, 30 inches is the correct choice, embodying the code's intent to ensure effective wastewater management and system functionality.