SCBA cylinders of aluminum, steel, and carbon-fiber must be hydrostatically tested every _____ years.

SCBA (Self-Contained Breathing Apparatus) cylinders, regardless of their construction material—whether aluminum, steel, or carbon-fiber—must undergo hydrostatic testing every five years to ensure their continued safety and integrity. This testing is crucial because it helps to identify any potential defects or weaknesses in the cylinder walls that could lead to failures or hazards during use. Each type of cylinder may have different maintenance requirements, but the five-year interval for hydrostatic testing is a standard requirement established by safety regulations and guidelines, promoting the reliability of firefighting equipment. Regular hydrostatic testing is a vital practice in maintaining operational readiness and ensuring that firefighters can work safely in hazardous environments.