What is the accepted practice concerning the pressure when testing a safety valve by hand?

The accepted practice concerning the pressure when testing a safety valve by hand is to ensure it reaches at least 75% of the popping pressure. This testing method is crucial for safety valves to confirm that they will function correctly during operation. By applying pressure that is a significant percentage of the specified popping pressure, operators can verify that the valve will open at or near its designated setting under normal operating conditions. Testing at this threshold provides a reliable indicator that the safety valve is operational and capable of relieving pressure effectively should the need arise. Testing at lower pressures may not provide a sufficient guarantee of the valve's performance, while testing at pressures equal to or above the popping pressure can be unnecessarily risky and could potentially lead to operational failures or safety hazards.