upright type fire fighting sprinkler

upright type fire fighting sprinkler    DEACRIPTION                                                                             Each closed-head sprinkler is held closed by either a heat-sensitive glass bulb (see below) or a two-part metal link held together withfusible alloy such as Wood's metal and other alloys with similar compositions.The glass bulb or link applies pressure to a pipe cap which acts as a plug which prevents water from flowing until the ambient temperature around the sprinkler reaches the design activation temperature of the individual sprinkler. Because each sprinkler activates independently when the predetermined heat level is reached, the number of sprinklers that operate is limited to only those near the fire, thereby maximizing the available water pressure over the point of fire origin.   The bulb breaks as a result of the thermal expansion of the liquid inside the bulb. The time it takes before a bulb breaks is dependent on the temperature. Below the design temperature, it does not break, and above the design temperature, it takes less time for higher temperatures. The response time is expressed as a response time index (RTI), which typically has values between 35 and 250 m½s½, where a low value indicates a fast response. Under standard testing procedures (135 °C air at a velocity of 2.5 m/s), a 68 °C sprinkler bulb will break within 7 to 33 seconds, depending on the RTI.[13] The RTI can also be specified in imperial units, where 1 ft½s½ is equivalent to 0.55 m½s½. The sensitivity of a sprinkler can be negatively affected if the thermal element has been painted.
TECHNICAL DATA                                                              ZST model Glass bulb Fire Sprinkler

Type	Upright		Pendent		Sidewall		Common		Concealed		ESFR
Model	ZSTZ		ZSTX		ZSTBS		ZSTP		ZSTDY		ZSTY
Nominal Diameter (mm)	DN15	DN20	DN15	DN20	DN15	DN20	DN15	DN20	DN15	DN20	DN20
Connecting Threaded (Inch)	1/2	3/4	1/2	3/4	1/2	3/4	1/2	3/4	1/2	3/4	3/4
Flux Coefficient	80	115	80	115	80	115	80	115	80	115	115
Bulb Diameter	5mm glass bulb for standard response 3mm glass bulb for quick response
Response Time	15seconds in general for 5mm glass bulb 8seconds in general for 3mm glass bulb
Response Time Index RTI (m·s)0.5	87 for 5mm glass bulb   22—25 for 3mm glass bulb

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