Which statement best describes the minimum water supply pressure to a mobile home according to most codes?

Which statement best describes the minimum water supply pressure to a mobile home according to most codes?

• A. 25 psi
• B. 15 psi
• C. 30 psi
• D. 20 psi

Answer: (D)

The basic point being tested is what minimum water pressure codes require to reliably supply a mobile home. Codes set a practical floor so that all fixtures—faucets, toilets, showers—have enough force to operate properly even with the shorter, often more compact plumbing runs found in mobile homes. Twenty pounds per square inch is the typical minimum that most codes allow, because it provides enough pressure for normal operation while keeping the system from being so high that it creates unnecessary stress or water hammer. If the pressure drops to about fifteen psi, some fixtures may run slowly or not fill completely, which is why that level isn’t regarded as sufficient. Pressures like twenty-five or thirty psi are higher than the minimum and are acceptable, but they aren’t the minimum requirement—the key point is that twenty psi is the threshold most codes recognize as the minimum for a functional supply to a mobile home.

The basic point being tested is what minimum water pressure codes require to reliably supply a mobile home. Codes set a practical floor so that all fixtures—faucets, toilets, showers—have enough force to operate properly even with the shorter, often more compact plumbing runs found in mobile homes. Twenty pounds per square inch is the typical minimum that most codes allow, because it provides enough pressure for normal operation while keeping the system from being so high that it creates unnecessary stress or water hammer.

If the pressure drops to about fifteen psi, some fixtures may run slowly or not fill completely, which is why that level isn’t regarded as sufficient. Pressures like twenty-five or thirty psi are higher than the minimum and are acceptable, but they aren’t the minimum requirement—the key point is that twenty psi is the threshold most codes recognize as the minimum for a functional supply to a mobile home.