Massachusetts Plumbers Journeyman Practice Exam

Under what circumstances can a mechanical pressure absorbing device be installed?

1. Only on exposed pipes

2. Only inside walls

3. At the mid-point of long pipe runs

4. At the ends of long pipe runs or connected to piping serving batteries of fixtures

The correct answer is: At the ends of long pipe runs or connected to piping serving batteries of fixtures

The correct answer is that a mechanical pressure absorbing device can be installed at the ends of long pipe runs or connected to piping serving batteries of fixtures because: Mechanical pressure absorbing devices, also known as pressure regulators or surge suppressors, are typically applied in situations where pressure fluctuations are likely to occur. Installing them at the ends of long pipe runs helps to prevent issues such as water hammer, which can damage piping systems and fixtures. Furthermore, connecting them to systems that serve multiple fixtures, such as batteries of fixtures, allows for better pressure regulation across those multiple outlets, ensuring consistent water pressure and protecting the fixtures from potential pressure spikes or drops. In contrast, other installation points, such as only on exposed pipes or inside walls, may not effectively address the potential for pressure surges in the long runs of piping leading to those spaces. Placing them only at mid-points of long runs may not provide adequate protection for both ends of the system or fail to reduce pressure fluctuations affecting the entire system. The chosen correct answer emphasizes optimal locations where their presence significantly mitigates the potential adverse effects of pressure changes in plumbing systems.