What must hydrostatic testing of fire extinguishers comply with?

Hydrostatic testing of fire extinguishers must comply with the specifications of the United States Department of Transportation (DOT) because the DOT sets the safety standards and regulations that govern the manufacture and maintenance of pressure vessels, including fire extinguishers. This includes requirements for testing procedures, testing frequency, and conditions under which extinguishers must be retested to ensure safety and reliability during use.

While the National Fire Protection Association (NFPA) sets standards for fire safety, including guidelines for the maintenance and servicing of fire extinguishers, the legal compliance for hydrostatic testing specifically aligns with the DOT’s regulations. Local fire departments may follow these guidelines as part of their operational procedures, and industry best practices can vary; however, it is the DOT specifications that provide the regulatory framework for hydrostatic testing compliance.