All wet-pipe sprinklers are held closed by either a fusible link or a glass bulb that contains a heat-sensitive liquid. A fusible link sprinkler head has a two-part metal element that is fused by a heat-sensitive alloy. The link holds the pip cap, or plug, in place.May 22, 2021
How does a fusible link sprinkler work?
Fusible link sprinklers A fusible link sprinkler has two levers held in place by a two-piece fusible link—solder that melts at a specified temperature. When the levers are in place, they hold a cap on the sprinkler orifice, preventing water flow.
Why is there a puddle around my sprinkler head?
Puddles of water around sprinkler heads are signs of leaky valves. To fix a leaky valve, you disassemble the valve, clean it, replace any bad parts and then reassemble it. Usually dirt, gravel or a rock is stuck in the valve causing it to stick open.Sep 3, 2015
How do you fix a sticky sprinkler head?
Lubricate the sprinkler head with spray lubricant if pushing it down with the water turned on had no effect. Spray the lubricant generously around the shaft and wait for it to soak for a minute. Then push and pull the head to loosen it. Turn on the water and check the sprinkler head operation.
Can you over tighten a sprinkler head?
Don't over tighten. You want to leave a little play left either way (unless you are capping it off, then you can tighten it down) in order to make adjustments in the next step. You could use pipe sealant tape if you are worried about a poor seal.May 21, 2018
At what temperature do sprinkler heads activate?
between 135 to 165 degrees Fahrenheit
How do glass bulb sprinklers work?
Glass bulb sprinkler heads have a small glass reservoir that holds a heat-sensitive liquid. This glass bulb holds the pip cap in place. When the room temperature of the liquid reaches a certain level, the liquid expands causing the glass bulb to break, which allows the pip cap to fall away releasing water.Feb 5, 2018
What causes a sprinkler head to activate?
Fire sprinklers work because high heat triggers the sprinkler system. When a blaze ignites, the air directly above it heats rapidly. This hot air rises and spreads along the ceiling. ... When the liquid expands, it shatters its glass confines and the sprinkler head activates.Feb 25, 2016
What is a fusible link in a sprinkler head?
All wet-pipe sprinklers are held closed by either a fusible link or a glass bulb that contains a heat-sensitive liquid. A fusible link sprinkler head has a two-part metal element that is fused by a heat-sensitive alloy. The link holds the pip cap, or plug, in place.May 22, 2021
How sensitive are fire sprinkler heads?
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.Jul 12, 2018
What thread is a sprinkler head?
What we call 1/2” and 3/4” fire sprinklers have either 1/2” or 3/4” thread connections. In the United States, most fire sprinklers are sold in one of two “sizes”: 1/2” (12.7 millimeters) and 3/4” (19.3 millimeters).Sep 9, 2019
What is the K factor of a 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. ... 0) permit much more water to flow through.Aug 8, 2018