How do you do hydro test of heat exchanger manually?

To manually perform a hydrostatic test on a heat exchanger, first, ensure that the unit is isolated and drained of all fluids. Connect a pressure gauge and fill the heat exchanger with water, eliminating any air pockets. Gradually increase the pressure to the specified test pressure, typically 1.5 times the operating pressure, and maintain it for a set duration, usually 30 minutes to an hour. Finally, inspect for leaks and monitor the pressure to ensure it remains stable throughout the test.