At what minimum gauge pressure should each pump be hydrostatically tested according to standards?

The minimum gauge pressure for hydrostatically testing pumps, according to industry standards, is set at 500 psi. This requirement is based on ensuring that pumps can withstand the operational pressures they will encounter during normal use, plus a safety margin. A hydrostatic test at this pressure helps to verify the integrity of the pump's components, confirming that they are structurally sound and leak-free.

Testing at 500 psi is an established standard that serves to ensure reliability and safety for water supply systems. It takes into account the high pressures that pumps might need to achieve in practical applications, allowing for adequate assessment of the pump's performance under stress. Factors like material strength, operational limits, and safety of personnel and equipment during operation are considered, making 500 psi a critical threshold in pump testing protocols.

The other options suggest higher pressures that are typically not required for standard hydrostatic testing, as 500 psi is sufficient for evaluating pump integrity while ensuring safety standards are met.