Massachusetts Plumbers Journeyman Practice Exam

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How many pipe diameters upstream and downstream of any soil or waste stack should the independent laundry main drain connect to the building drain?

  1. 10 pipe diameters

  2. 20 pipe diameters

  3. 40 pipe diameters

  4. 30 pipe diameters

The correct answer is: 40 pipe diameters

The independent laundry main drain should connect to the building drain with 40 pipe diameters upstream and downstream of any soil or waste stack. This distance helps ensure proper drainage and venting for the system. It allows for adequate space for the wastewater to flow smoothly without causing any blockages or disruptions in the system. Connecting the laundry main drain at this distance is essential for the overall functionality and efficiency of the plumbing system. Option A, B, and D are incorrect as they do not provide the recommended distance required for connecting the independent laundry main drain to the building drain, which is 40 pipe diameters.

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