Hydrostatic Testing: Changes to NFPA 25 Over the Decades

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When is hydrostatic testing of standpipe systems and fire department connections required in accordance with NFPA 25: Standard for Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems?

Since the inception of NFPA 25 in , hydrostatic testing has been required on specific systems typically at five-year intervals. It is conducted to verify the integrity of a system. Typically, the requirement has been to test systems at 200 psi or 50 psi above the maximum pressure for two hours. For example, if a system has a maximum pressure of 175, then the system would require a hydrostatic test at 225 psi.

In the through editions of NFPA 25, hydrostatic testing is required on dry standpipe systems and dry portions of wet standpipe systems. The dry portion of the wet standpipe system is the fire department connection.

NFPA 25,

6.3.2.1 Hydrostatic tests at not less than 13.8-bar (200-psi) pressure for 2 hours, or at 3.4 bar (50 psi) in excess of the maximum pressure, where maximum pressure is in excess of 10.3 bar (150 psi), shall be conducted every 5 years on dry standpipe systems and dry portions of wet standpipe systems.

The language was changed again in the edition from automatic dry to semiautomatic dry standpipe systems. This change was made because automatic dry systems are typically monitored by air, and a semiautomatic dry standpipe is typically a deluge system and not normally monitored by air pressure. The edition also changed the wording from dry portions of the wet system to specifically cite testing of the fire department connection.

NFPA 25,

6.3.2.1 Hydrostatic tests of not less than 200 psi (13.8 bar) pressure for 2 hours, or at 50 psi (3.4 bar) in excess of the maximum pressure, where maximum pressure is in excess of 150 psi (10.3 bar), shall be conducted every 5 years on manual standpipe systems and semiautomatic dry standpipe systems, including piping in the fire department connection.

In the edition, a section was added in chapter 13 that requires hydrostatic testing at 150 psi from the fire department connection to the check valve. The language in chapter 6 did not change. This means that the fire department connection for manual dry standpipe and semiautomatic standpipe systems still need to be tested at 200 psi, and all other fire department connections are tested at 150 psi. The reason for this change was that 150 psi is the most frequently used operating procedure of fire departments when supporting fire protection systems.

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NFPA 25,

6.3.2.1* Hydrostatic tests of not less than 200 psi (13.8 bar) pressure for 2 hours, or at 50 psi (3.4 bar) in excess of the maximum pressure, where maximum pressure is in excess of 150 psi (10.3 bar), shall be conducted every 5 years on manual standpipe systems and semiautomatic dry standpipe systems, including piping in the fire department connection.

13.7.4 The piping from the fire department connection to the fire department check valve shall be hydrostatically tested at 150 psi (10 bar) for 2 hours at least once every 5 years.

NFPA 25 current requirements for hydrostatic testing

The and editions have not changed from the language.

Manual wet standpipes that are part of a combined sprinkler/standpipe system are not required to be hydrostatically tested in any edition. However, pipe from the fire department connection to the check valve is required to be tested at 150 psi in accordance with the edition and later.

The only other times that systems must be hydro tested is when repairs are made, and the component action tables found in NFPA 25 require appropriate testing. There are other areas within NFPA 25 that require hydrostatic testing, such as foam systems and water mist systems that were not addressed in this blog.

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