Massachusetts Plumbers Journeyman Practice Exam

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How should a stand pipe receptor for an automatic clothes washing machine be installed according to the text?

Without a trap
At least 36 inches above its trap
Individually trapped and vented
Connected directly to the sewer line

The correct answer is: Individually trapped and vented

The correct installation for a standpipe receptor for an automatic clothes washing machine should indeed be individually trapped and vented. This design is crucial for maintaining proper drainage while preventing potential sewage gases from entering the living space. An individual trap ensures that the wastewater from the washing machine is contained and can flow freely without backflow or blockages. Additionally, venting is necessary to allow air to escape and to maintain the proper pressure within the drainage system, which prevents siphoning of the trap seal. This practice aligns with plumbing codes and standards that aim to ensure the safe and efficient operation of plumbing fixtures. The other options do not meet the required standards for plumbing installations. For instance, installing the standpipe without a trap could lead to issues with odor and backflow. Likewise, having it set at a height of at least 36 inches above its trap is insufficient without individual trapping and venting. Lastly, connecting the standpipe directly to the sewer line poses a risk of contamination and is not compliant with proper waste management practices. Thus, C is the most suitable and compliant option for ensuring both functionality and safety.