Massachusetts Plumbers Journeyman Practice Exam

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Study for the Massachusetts Plumbers Journeyman Exam. Prepare with multiple choice questions, hints, and detailed explanations. Ace your licensing exam with confidence!

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What should the standpipe extend to a minimum height above the base of a clothes washing machine?

20 inches
25 inches
30 inches
35 inches

The correct answer is: 30 inches

The correct height for a standpipe serving a clothes washing machine is 30 inches above the base of the machine. This height requirement is established to ensure that the standpipe effectively prevents siphoning, which can lead to improper drainage or backflow of wastewater into the washing machine. A standpipe that is too short may allow water to flow back into the appliance, creating potential health hazards, creating messes, or causing damage to the machine itself. The standard height of 30 inches also helps accommodate the washing machine's discharge hose, ensuring proper drainage without the risk of overflowing. The design of the plumbing system should always adhere to these standards to maintain efficient and safe operation. While there are other height measurements provided, none serve the dual purpose of preventing siphoning and ensuring proper function of the washing machine as effectively as the 30-inch requirement.