How often must a water fire extinguisher undergo hydrostatic testing?

Water fire extinguishers must undergo hydrostatic testing every five years. This requirement is based on ensuring that the extinguisher maintains its integrity and functionality over time. Hydrostatic testing involves filling the extinguisher with water and subjecting it to high pressure to check for leaks, weaknesses, or structural integrity issues. This testing helps ensure that when needed, the extinguisher will perform effectively.

The five-year interval allows sufficient time for any potential wear and tear to be assessed while still ensuring the safety of the users in case of a fire emergency. Additionally, this periodic testing aligns with National Fire Protection Association (NFPA) standards, which are widely recognized and followed in the industry.