How often should fire extinguishers with a steel shell and less than 150 lbs be tested?

For fire extinguishers with a steel shell that weigh less than 150 pounds, the correct interval for testing is 12 years. This is in accordance with the National Fire Protection Association (NFPA) guidelines, which stipulate that these types of extinguishers should receive a thorough inspection every twelve years. During this test, the extinguisher is subjected to a hydrostatic test to ensure it can withstand normal operational pressures and to check for any deterioration that might affect its reliability.

Regular testing is crucial for maintaining the operational integrity of fire extinguishers, as they can degrade over time or become ineffective due to factors like corrosion or leakage. The 12-year requirement ensures that extinguishers remain functional and safe to use in the event of a fire.

Choosing a different timeframe, such as yearly, every 5 years, or every 10 years, does not align with current standards and could lead to compliance issues or potentially put individuals at risk if a fire occurs and the extinguishers are not adequately tested or maintained.