What must a shop have for hydrostatic testing?

The requirement for a protective cage during hydrostatic testing is crucial for safety. In the context of hydrostatic testing, which involves pressurizing a cylinder with water to check for structural integrity and leaks, the protective cage serves as a barrier to contain any potential hazards. If the cylinder were to fail or rupture during the test, the protective cage helps to prevent injuries by containing the debris and force of the explosion.

Other options may be important in various settings, but they do not specifically address the immediate safety concerns associated with the high-pressure testing of fire extinguishers or similar equipment. A clean room or ventilation system may be beneficial for ensuring cleanliness or air quality, while a fire alarm system is important for overall safety in the shop environment. However, the protective cage directly addresses the specific risks involved in hydrostatic testing, making it an essential requirement in this context.