Exactly where to place the hammer arrestor will depend on the actual piping arrangement. The best places are either close to the pump, isolation or check valve that is originating the hammer, or at more distant points where the pipe changes direction, for example at the top of a pump riser.
Properly sized water hammer arresters should be installed on the hot and cold water supply piping to that fixture, equipment or apparatus wherein shock can be produced. A pressure reducing valve installed on the discharge side of the water meter can be most helpful in protecting the residential piping system.
When long runs of piping are employed to serve a remote item of equipment, the water hammer arrester should be located as close as possible to the point of quick closure. At this location, the water hammer arrester will control the developed energy and prevent the shock wave from surging through the piping system.
The “end” of the header can be defined as “between the last two fixtures,” or “within 6 feet of the last fixture.” In cases of headers longer than 20 feet, place the properly sized arrester for each 20 foot section at the end of that 20 foot section.
The general rule is that water hammer arrestors are required on all quick closing valves.
Yes. Oatey hammer arrestors are gas filled chambers which absorb shock no matter what angle they are installed.
A: Although arresters are typically tested to 10,000 cycles, Sioux Chief arresters have been independently lab tested to withstand 500,000 cycles without failure. All Sioux Chief arresters are guaranteed to control water hammer for the lifetime of the plumbing system.
A water hammer arrestor uses a spring or a special valve to absorb the pressure of the water built up in the system as a result of the change in water flow. It also has a muffler to reduce the noise levels by slowing down the flow of water in the pipe.
Hand screw the water arrestor to the water stop valve; use a tee fitting to aid the connection when necessary. The Hammer Arrestor can be installed in any directional position (horizontal, vertical, etc.) as needed.
Yes. A water hammer can cause a pipe rupture which results from a break in the pipe system. This effect occurs if the pipe is not equipped to handle the pressure and instead ruptures or bursts. This can also happen when the pipe joints weaken from the pressure of the hydraulic shock.
A common cause of water hammer is high water pressure. If your pressure is running near 100 psi, then it's likely the cause of your issue. Normal pressure should be approximately 30 to 55 psi. To solve this problem, consider installing a water pressure regulator.
Water hammer is found usually with washing machines, dishwashers, toilet valves, and faucets and can happen because of faucet washers that are worn or damaged.
Although water hammer arrestors will reduce the noise caused by water hammer and using PEX materials will help eliminate damages, PEX piping that is free to expand and contract may occasionally hit something as it moves once the water flow has been stopped, causing some noise.
If an arrester doesn't eliminate the water hammer, reduce peak flow by partially closing the water-supply valves. The washer will fill more slowly but it will still fill to the right water level. If that doesn't work, consider a larger arrester or pressure reducing valves.
Water arrestors by their design are an addition to the pipe. A little air chamber that extends perpendicular off each that is sealed off from water. When the water moves suddenly in the pipe that air chamber absorbs the shock. As they get used though, over time they wear out making them ineffective.
This can be fixed by draining your plumbing system, which requires turning off the main water valve and opening the highest faucet in your home. Then drain water from the lowest faucet.
Water hammer can cause serious damage to pipelines, pipe joins gaskets, and all other components of the system like flow meters and pressure gauges. On contact, these pressure spikes can easily exceed five to ten times the working pressure of the system, placing a tremendous amount of stress on the system.
There are two major types of water hammer arrestors, those fitted with pistons and those not fitted with pistons. Among the various means to dampen the pressure spike of water hammer, those varieties fitted with a piston are the most effective.
Surge (Water Hammer)
Without question, the primary cause of water hammer in process applications is the quick closing valve, whether manual or automatic. A valve closing in 1.5 sec. or less depending upon valve size and system conditions, causes an abrupt stoppage of flow.
When a valve closes quickly and stops the flow, that momentum shakes and pounds pipes. A water hammer arrestor cures this condition with a cushion of air that absorbs the momentum.
Ideally, the line pressure in a branch should not exceed 55 PSIG. To maintain proper branch pressure, a water pressure reducing valve, such as the FNW 1201, should be installed. If, however, branch pressures exceed 65 PSIG, the next larger size water hammer arrestor is recommended.
Yes. All of the water hammer arrestors shown above are approved for sealed wall installations with no access panel required. Water conservation is something we all should practice.
Water hammer arrestors are used to absorb the shock when water flowing in a piping system suddenly stops due to fast closing shutoff valves, dishwashers, and clothes washers. This action protects against annoying and potentially damaging effects of water hammer.
The most important way to prevent water hammer is to remove the water from the steam lines before passing the steam again through them. Water is removed from the steam lines using drain connections. All the water should be drained out to make the lines clear.