NFPA 25 (1998 edition), section 4-3.1 has a requirement listed to test the Private Fire Service Mains once every 5 years. The standard says the test must be performed on exposed fire service mains and underground fire service mains. The handbook that accompanies the NFPA 25 standard explains this water-flow test on the private fire service mains applies to only private exposed and underground fire service mains that are outside the facility, such as piping to a private fire hydrant. The piping inside the facility is covered under a different section of the NFPA 25 standard.
The Annex section A-4-3.1 of NFPA 25 says this flow test can be performed through yard fire hydrants; a fire department connection (once the check-valve is removed); and other connections. Typically, the test is conducted at a fire hydrant that is connected to the private fire service mains due to it accessibility. The test must be able to measure flow in gallons per minute (GPM), and the results are measured against the original acceptance data. The key thing to understand at your facility is whether or not you own the fire hydrants that are close to your building, or if they are owned by the city or municipality. Surprisingly, many facility managers simply do not know. If they are privately owned, then you need to conduct the 5-year private fire service main flow test.
Nat all surveyors are asking to see this documentation during a survey, but it is becoming a more frequent request. Remember: The 2000 Life Safety Code, section 9.7.5 requires compliance with the entire NFPA 25, so everything in the standard must be followed as long as you have the equipment.
Not all accreditation organizations are consistent in reviewing this documentation, but as time progresses, you will see more and more surveyors ask to review this test report. This 5-year private fire service main water-flow test should not be confused with the annual water-flow of the private fire hydrants and the 5-year internal inspection of sprinkler piping.