A dry pipe sprinkler system is one in which pipes are filled with pressurized air or nitrogen, rather than water. … Located in a heated space, the dry-pipe valve prevents water from entering the pipe until a fire causes one or more sprinklers to operate. Once this happens, the air escapes and the dry pipe valve releases.
What is the main reason for using a dry pipe sprinkler system instead of a wet pipe sprinkler system?
Dry pipe sprinkler systems are filled with pressurized air or nitrogen instead of water to prevent frozen and burst sprinkler pipes in areas with colder temperatures. The pressurized air in the sprinkler pipes prevents water from entering the pipes.
Can a dry sprinkler system freeze?
“Dry pipe” fire sprinklers are typically found in unheated attic spaces or warehouses in cold climates. … Now the pipe is “wet,” and in an unheated space, it can freeze and burst, potentially causing significant property damage and business interruption.
What do dry sprinkler system contain?
A dry pipe sprinkler system is one in which pipes are filled with pressurized air or nitrogen, rather than water. This air holds a remote valve, known as a dry pipe valve, in a closed position.
How do I know if OS&Y is open?
An OS&Y valve is open when the threaded stem extends from the valve. The valve is closed when the stem is not visible above the control wheel.
What causes a wet pipe sprinkler to activate?
Fire sprinkler heads are automatically triggered by a buildup of heat. A liquid-filled glass bulb bursts or a soldered metal link melts at a given temperature, allowing a plug to drop out, followed by water.
What causes a wet pipe sprinkler system to activate?
When the air around a sprinkler reaches a certain temperature, the liquid inside the bulb expands until the pressure causes the glass to break. In wet sprinkler systems, pressurized water in the pipes then forces out the plug and flows over a deflector plate that sprays it onto the fire in a carefully designed pattern.
Are ESFR sprinklers wet or dry?
ESFR Dry sprinklers can ONLY be installed in Wet systems! Not for installation in dry or preaction systems.
Is a preaction system a dry system?
Preaction systems may take the place of dry systems. Preaction systems utilize closed sprinklers, compressed nitrogen or air in the system piping, and water under pressure held below the clapper of the valve. Preaction systems require a detection and release system.
How does a dry valve work?
The dry pipe valve prevents water from entering the pipe until a fire causes one of the sprinklers to operate. If this occurs, then the valve releases the air, water flows into the pipe, and the sprinklers release the water onto the fire.