If the maximum system pressure exceeds 150 psi, the hydrostatic test pressure must be at least how many psi above the maximum?

If the maximum system pressure exceeds 150 psi, the hydrostatic test pressure must be at least how many psi above the maximum?

• A. 50 psi above maximum
• B. 200 psi
• C. 75 psi
• D. 100 psi

Answer: (A)

Hydrostatic testing uses a pressure higher than normal operating pressure to reveal leaks and weaknesses in the piping. When the system’s maximum pressure exceeds 150 psi, the rule requires the test pressure to be at least 50 psi higher than that maximum. This creates a safety margin to ensure the system can withstand a pressure rise without failing, without applying excessive stress. For example, if the maximum operating pressure is 180 psi, the hydrostatic test pressure must be at least 230 psi. The 50 psi margin is the minimum required, so any test pressure must be at least 50 psi above the maximum.

Hydrostatic testing uses a pressure higher than normal operating pressure to reveal leaks and weaknesses in the piping. When the system’s maximum pressure exceeds 150 psi, the rule requires the test pressure to be at least 50 psi higher than that maximum. This creates a safety margin to ensure the system can withstand a pressure rise without failing, without applying excessive stress.

For example, if the maximum operating pressure is 180 psi, the hydrostatic test pressure must be at least 230 psi. The 50 psi margin is the minimum required, so any test pressure must be at least 50 psi above the maximum.