Rhode Island Journeyman Plumber Practice Exam

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What is the minimum working pressure of a domestic water service when buried?

60 psi @180 degrees
80 psi @180 degrees
100 psi @180 degrees
120 psi @180 degrees

The correct answer is: 100 psi @180 degrees

The minimum working pressure of a domestic water service when buried is established to ensure that the water supply can reliably deliver water without unnecessary risk of failure or leakage under normal operating conditions. A minimum working pressure of 100 psi is set to accommodate various factors such as changes in elevation, potential pressure losses due to friction within the piping, and the need to maintain adequate pressure at the point of use, especially when multiple fixtures may be in operation simultaneously. This pressure threshold ensures that water can effectively reach various levels of plumbing fixtures and appliances within a household, providing reliable access to water even when the system undergoes fluctuating demands. Additionally, a higher working pressure can provide a buffer against potential drops in pressure that might occur due to high demand or other system factors. Understanding these specifications is crucial for proper installation and maintenance of plumbing systems, as it affects not only the function of the system but also its safety and longevity.