What is the recommended interval for hydrostatic testing of a fire extinguisher?

The recommended interval for hydrostatic testing of a fire extinguisher is typically 5 years. This testing is essential to ensure that the extinguisher can withstand the pressure it will encounter during use and to check for any deterioration or weakness in the cylinder. Over time, materials can degrade due to corrosion, wear, or other factors, which could compromise the extinguisher's effectiveness. Hydrostatic testing involves filling the extinguisher with water or another test fluid and pressurizing it to a specified level, allowing technicians to identify any faults or leaks.

Regular testing at this interval helps ensure safety and compliance with industry standards, such as those from the National Fire Protection Association (NFPA) and Underwriters Laboratories (UL). Fire extinguishers that have passed this testing are deemed reliable for use in emergency situations, providing confidence in their performance when needed.