Cylinders made of composite materials, such as Kevlar or fiberglass, must be hydrostatically tested every how many years?

Cylinders made of composite materials, such as Kevlar or fiberglass, are designed with specific safety considerations in mind due to the unique properties of these materials. The requirement for hydrostatic testing every 3 years is established to ensure the integrity and safety of the cylinder under pressure. This testing process involves filling the cylinder with water, pressurizing it, and checking for leaks or structural weaknesses.

Composite cylinders are more susceptible to environmental degradation and wear over time compared to traditional steel cylinders. By conducting these tests every 3 years, it ensures that any potential issues that could compromise the safety of the cylinder are identified and addressed promptly. This frequency strikes a balance between adequate safety assurance and practical maintenance intervals, aligning with industry standards and regulations that prioritize the well-being of both the users and the environment.

Regular testing at this interval helps to maintain the reliability of the equipment used in firefighting and hazardous materials response, where the safe handling of pressurized gas is crucial.