Massachusetts Plumbers Journeyman Practice Exam 2025 – All-in-One Guide to Master Your Licensing Test!

Question: 1 / 400

When compacting and backfilling around a pipe in a piping trench installation, how far should the backfill material be over the crown of the pipe?

Three inches

Four inches

Six inches

The correct choice is six inches. When compacting and backfilling around a pipe, it is essential to ensure that the backfill material extends at least six inches above the crown of the pipe. This practice helps to provide adequate support and protection for the pipe, reducing the risk of damage from soil settling or other external pressures. Having this minimum amount of backfill ensures that the pipe is securely encased, which contributes to the overall stability and integrity of the installation. This recommendation is based on industry standards that emphasize the importance of proper installation techniques to prevent future repair needs and maintain the performance of the piping system.

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Eight inches

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