What type of testing is required for fire pump installations to verify piping integrity and absence of leaks at elevated pressure?

• A. Dynamic testing
• B. Hydrostatic testing
• C. Electrical testing
• D. Functional testing

Answer: (B)

Hydrostatic testing is used to verify piping integrity and detect leaks by filling the system with water and pressurizing it to a level above normal operating pressure. This test checks joints, welds, flanges, and fittings to ensure the piping network can withstand the elevated pressure without leaks. In NFPA 20, the test is performed to confirm the piping can handle the required pressure before the pump is put into service, typically at about 1.5 times the maximum working pressure (or as specified by the code). Dynamic testing, electrical testing, and functional testing serve other purposes (pump operation, electrical circuits, or overall pump function) and do not focus on ensuring the piping itself is leak-free under high pressure.