What is the minimum distance between a sprinkler head and any obstruction?
1 foot
In short the “beam rule” states that there must be at least 1 foot (0.3048 m)of separation between the sprinkler and the obstruction if the deflector is any distance above the bottom of the obstruction.
What is K factor sprinkler head?
The k-factor for a fire sprinkler is the discharge coefficient, or in normal human terms just relates to the amount of water that is permitted through the sprinkler. The k-factor is dependent upon the orifice diameter of the sprinkler – a low k-factor (such as K2.
What is the most common temperature rating of sprinkler heads?
175-225OF
Typically, ordinary or intermediate which has a temperature rating of 175-225OF (79-107OC) sprinklers are required to be installed unless a certain situation calls for a higher temperature classification.
What temperature is a green sprinkler head?
200° F
Green – 200° F. Blue – 286° F. Purple – 360° F. Black – 440° F.
How close can a sprinkler head be?
18 inches
In a nutshell, NFPA 25: Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems says that objects that can block a sprinkler’s spray must be at least 18 inches away from the deflector.
How much clearance should be under sprinkler heads?
The minimum vertical clearance between sprinklers and material below shall be 18 inches (45.7cm).
How do you calculate K-factor for sprinklers?
K-factors can be determined by using the following equation: K = Q/P1/2, where K is represented by gallons per minute, or gpm/psi1/2, Q is flow rate in gpm and P is pressure in psi, or pounds of force.
How do I choose sprinkler K-factor?
K-factors may be chosen based on water supply characteristics. For a supply with higher available water volume at a lower pressure, higher K-factor sprinklers can be used. For water supplies with lower water volume available at a higher pressure, smaller K-factor sprinklers can be used.
At what temperature do sprinkler heads go off?
between 155 to 165 degrees Fahrenheit
What DOES Set Off Fire Sprinklers? Fire sprinkler systems are actually quite sophisticated, and are designed to be heat sensitive so that sprinklers only activate when the temperatures rise to fire-induced temps, usually somewhere between 155 to 165 degrees Fahrenheit.
What is sprinkler RTI?
Quick Response Sprinklers RTI is a measure of how thermally responsive the heat-responsive element of the sprinkler is, measured as the time needed to raise the temperature of the sprinkler bulb to 63% of the temperature of the hot air stream times the square root of the velocity of the air stream.
