Most commercial property owners and facility managers in Hampton Roads know they need to inspect their fire sprinklers to ensure they will put out a fire. Fewer realize they have an equally critical obligation to ensure their fire system doesn’t poison the public drinking water.
Your building’s fire sprinkler or standpipe system is connected directly to the municipal potable water supply managed by local utilities like Hampton Roads Sanitation District (HRSD), Newport News Waterworks, or the Cities of Norfolk and Virginia Beach. While this connection ensures a reliable, high-volume source of water for fighting fires, it creates a potential cross-connection hazard: the risk of stagnant, non-potable water from your sprinkler pipes flowing backward into the city mains.
To prevent this, codes mandate the installation of a backflow prevention assembly on the fire service line. Furthermore, these mechanical devices must undergo rigorous backflow preventer testing for fire systems annually to ensure they are working correctly. At Sefirepro, our certified technicians provide this essential service, keeping you compliant with both water authority regulations and fire codes.
The Hazard: Why Fire Sprinkler Water is “Bad”
The water inside a fire sprinkler system is not the same as the water coming out of your tap.
- Stagnation: The water sitting in sprinkler pipes may stay there for years or decades without moving. It becomes foul, stagnant, and is a breeding ground for bacteria.
- Corrosion and Sludge: Most fire pipes are made of black steel. Over time, the interior corrodes, creating a black, smelly sludge of rust and mineral deposits.
- Chemical Additives: In some systems (especially in unheated areas), antifreeze solutions or corrosion inhibitors may be added to the water, which are toxic if ingested.
If this water were to backflow into the public mains, it could contaminate the drinking water for the surrounding neighborhood, causing a public health crisis.
How Backflow Occurs
Under normal conditions, water flows in one direction: from the high-pressure city main into your building. A backflow event can occur due to two primary conditions:
1. Backpressure
This occurs when the pressure inside your building’s fire system becomes higher than the pressure in the city main, forcing water backward. This can happen if your building has a fire pump that boosts pressure, or due to thermal expansion in the pipes on a hot day.
2. Backsiphonage
This occurs when pressure in the city main drops suddenly, creating a vacuum that sucks water from your building back into the street. This frequently happens during a water main break nearby, or when fire department pumpers draw massive amounts of water from hydrants to fight a major fire down the street.
The Solution: The Double Check Valve Assembly
For most fire systems, the required protection is a Double Check Valve Assembly (DCVA). This device consists of two independent, spring-loaded check valves in series. They are designed to open to allow water to flow into the fire system but slam shut immediately if water tries to flow backward. Two valves provide redundancy; if one fails due to debris, the other should still hold.
The Annual Testing Mandate
Because these assemblies are mechanical devices with moving parts, springs, and rubber seals, they can and do fail over time due to wear, corrosion, or debris getting stuck in the valve seats.
Therefore, annual testing is mandatory under two distinct regulatory bodies:
- The Local Water Purveyor: Your water utility requires an annual test report to ensure their system is protected. Failure to test can lead to them shutting off your building’s water service.
- NFPA 25 (The Fire Code): The standard for maintaining fire protection systems also mandates annual testing to ensure the device doesn’t impede water flow to the sprinklers during a fire.
The Sefirepro Testing Process
A backflow test is a precise procedure performed by a state-certified technician.
- Notification: We notify you in advance, as the test requires briefly shutting off the water supply to the fire system, which may trigger a supervisory signal on your fire alarm panel.
- Differential Pressure Test: We connect specialized, calibrated gauges to test ports on the assembly. We simulate pressure differentials across each of the two check valves to verify they hold tightly against backpressure and that the internal springs are functioning correctly.
- Reporting: If the device passes, we complete the specific test report form required by your local water municipality and submit it on your behalf.
- Repair (If Needed): If a device fails, it must be repaired immediately. Sefirepro technicians are equipped to open the assembly, clean internal components, and replace worn rubber parts or springs to restore functionality.
Conclusion: A Critical Dual Responsibility
Annual backflow preventer testing for fire systems is a critical responsibility for property owners in Hampton Roads. It ensures your fire system has water when needed, and it protects your community’s drinking water from contamination.
Stay compliant with both your water utility and the Fire Marshal. Contact Sefirepro today to schedule your certified backflow preventer test.