What equipment is needed for hydrostatic testing of fire extinguishers?

The correct answer indicates that a protective cage and test pump are essential for hydrostatic testing of fire extinguishers. Hydrostatic testing is a critical procedure utilized to ensure the integrity and safety of fire extinguishers under pressure. The protective cage is used to contain the extinguisher during the test process, safeguarding personnel from potential hazards in the event of a failure or explosion. The test pump is employed to safely pressurize the extinguisher to the required levels for the test.

This testing process assesses the strength and reliability of the extinguisher's cylinder and helps confirm that it can withstand the pressures encountered during normal operations. Without the proper equipment, such as the protective cage and test pump, the testing procedure would be unsafe and could lead to serious accidents.

In contrast, the other options do not provide the appropriate equipment necessary for hydrostatic testing. A flow meter and pressure gauge primarily measure flow rates and pressures in systems, but they are not specifically designed for testing the structural integrity of fire extinguishers. A thermometer and voltage meter are unrelated to the hydrostatic testing process, as they measure temperature and electrical parameters, respectively. Similarly, a corrosive environment suit would be relevant in hazardous material handling but not directly applicable to the hydrostatic