![]() These are coordinated into ranges that allow the user to select a model accommodating the maximum anticipated ceiling temperature in the space. Fast response sprinklers can consist of quick response spray, extended coverage, early suppression fast response and residential sprinklers.Įach sprinkler has a temperature rating for operation. Standard response sprinklers can include standard spray, extended coverage, control mode density area and control mode specific application sprinklers. Those less than 50 (meter-seconds)½ are considered fast response. RTI values above 80 (meter-seconds)½ are classified as standard response. However, there are many models in standard response and fast response. Very few sprinklers are listed with a special response category. The RTI value allows the sprinkler to fall into one of three groups: standard response, special response or fast response. The bulb clears out of the way and the water can flow through the sprinkler.įire sprinklers are divided into categories based on their response time index (RTI), a laboratory-measured value that determines how long a fire sprinkler will take to operate under known conditions of hot air moving by the device. ![]() A small air bubble expands when heated and bursts the glass bulb at the desired temperature rating. Here, a glass bulb is filled with a liquid. ![]() In this style, the solder is made to melt at a specified temperature, the components clear from the orifice and then water can flow through the sprinkler. There are two styles for closed sprinklers. The water flow would be triggered by another device, such as heat detectors. ![]() This means there is no operating device and when water flows, it will come through all the open sprinklers. Now there are so many options that selecting the best one for a project is not always straightforward.įirst, there are three types of configurations for operating sprinklers. Much refinement has occurred since the very first models arrived on the market. Fire sprinklers have been around since the 1800s, with Henry Parmalee often credited with developing the first modern sprinkler to protect his piano factory in Connecticut. ![]()
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