Proper inspection & maintenance ensure reliable fire protection
An electrical malfunction in an office building causes a fire. The fire department rolls up to the building, sirens blaring. They rush to the fire hydrant, connect their hose—and no water comes out. Whoops.
Fire hydrant maintenance is—quite literally—a life-or-death proposition. The following information on fire hydrant operation and maintenance provides insight into this process. These tips apply to the dry-barrel hydrants commonly used on water distribution systems in the Midwest.
Fire hydrants must be operated properly, so adequate fire protection can consistently be provided. Always use a hydrant wrench when operating a hydrant. Repeated use of a pipe wrench on the five-sided operating nut will round off the nut so a hydrant wrench will no longer work.
After opening the highest port, slowly open the hydrant valve a few turns until water has reached the open port. Flush any debris that may be in the hydrant barrel. When the water is clear, slowly open the hydrant fully. It is important to displace trapped air from the hydrant barrel. Compressed air could cause problems. Remember that air is compressible, and water is not compressible.
Sometimes the internal hydrant valve may not function properly due to debris or mechanical problems. Whenever possible, attach an operating hand valve to the port from which water will flow. If flow from the hydrant cannot be completely shut down using the operating nut, use the hand valve to stop flow, and then close the control valve on the hydrant lead to completely shut down the hydrant so repairs and/or replacement work can be done.
Very old hydrants should not be operated by inexperienced personnel because hydrants may not seat well when closed and may be left running. Also, an inexperienced person may break the stem while forcing it in an attempt to get the hydrant to stop leaking. Therefore, the use of a pipe or “cheater” bar should be discouraged when operating an older hydrant.
Flow should be diverted by diffusers, hoses or other equipment. Proper traffic control should be provided as needed.
Fire hydrants must always be operable and capable of providing adequate fire protection, so systematic maintenance and inspection are vital. Repairs can be scheduled proactively instead of reactively, and problems can be dealt with before they become catastrophic.
Hydrants should be inspected on a regular basis at least once a year. Dry-barrel hydrants may require two inspections per year, in the spring and fall.
Every hydrant inspection should be documented, and problems with a hydrant should be reported immediately.
Below is an example of a proper hydrant maintenance inspection:
Note: In order for a municipality to get full credit from ISO, they must do hydrant maintenance every six months. Other ISO requirements include:
Additional questions to ask during a proper hydrant maintenance inspection include:
The Minneapolis suburb of Burnsville, Minn., stands out in its devotion to hydrant inspection and maintenance. Burnsville (population: 61,000) comprises more than 3,800 hydrants. Around two-thirds of these are public hydrants, which the city inspects. The other third are private hydrants, or those on “private” water mains—including hydrants for commercial properties, apartment buildings and townhome developments. Fire codes dictate each hydrant be inspected annually.
In 2013, the city of Burnsville began a private hydrant inspection program, hiring a company (M.E. Simpson Co. Inc.) to inspect those private hydrants that did not already have independent inspections. Burnsville then added the price of inspection (typically $55, divided into monthly payments) onto the property owner’s water bill.
Maintenance for the private and public hydrants includes, among other things, flushing, which helps to remove mineral deposits in water mains; checking on rubber gaskets and moving parts, wear and tear on which can create leaks; and ensuring that the hydrant has not been damaged (e.g., if a car or truck runs into a hydrant, knocking it off of its rod). Minnesota’s freezing weather also poses potential issues, as leaking water, when frozen, can damage the hydrant.
The private hydrant inspection program has been a resounding success, according to Linda Mullen, utilities superintendent for the city of Burnsville.
“The first year [of the private hydrant inspection program], we had 30 hydrants that, when we went to do the inspection, there was no water. Now, all of the hydrants are in compliance,” said Mullen.
Before the program, many times private hydrants “were installed and they may not have been inspected,” Mullen said. “We had hydrants sitting on those private properties, and if there had been a fire, there would have been no water coming out of them to fight the fire. That was one of the biggest reasons that we implemented this program five years ago.”