During hydrostatic testing, is it permissible to leave hose assemblies on cartridge-operated fire extinguishers?

During hydrostatic testing, it is critical to follow safety protocols to ensure the integrity and reliability of fire extinguishers. Leaving hose assemblies on cartridge-operated fire extinguishers during hydrostatic testing is not permissible because it can compromise the testing process. The pressure from the hydrostatic test could damage the hose assembly or create a failure point, potentially leading to unsafe conditions.

Removing the hose assembly allows for a thorough inspection of both the cylinder and the valve assembly, ensuring that each component can withstand the required pressure and that any possible vulnerabilities are addressed. This practice aligns with NFPA 10 standards, which prioritize safety and accurate assessments of fire extinguishers' functionality.

Context about other options: While some variations might exist for specific extinguisher models or under modified conditions, following the standard procedure of removing hose assemblies ensures uniform safety practices across all types of cartridge-operated fire extinguishers.