How often must refillable refrigerant cylinders be retested?

Refillable refrigerant cylinders must be retested every 5 years to ensure they are safe for use and compliant with safety standards. This retesting process typically involves inspecting the cylinder for any signs of wear, damage, or corrosion, and verifying that the cylinder meets the specifications set forth by regulatory bodies such as the Department of Transportation (DOT) in the United States.

This 5-year interval is crucial because it helps to prevent potential accidents that could arise from using a cylinder that may not be structurally sound. Regular retesting ensures that the cylinder can withstand the pressures associated with storing refrigerants, as well as any environmental factors that could affect its integrity over time.

With other intervals listed, while being longer periods, they do not provide adequate safety assurances required for handling pressurized materials, thus highlighting the importance of the 5-year requirement in maintaining safety and compliance within the refrigeration industry.