Sprinkler Heads
Sprinkler Heads are the sensing end-elements of the sprinkler system, detecting heat and opening to discharge water on the fire. Types vary by spray direction (pendant, upright, sidewall), activation mechanism (glass bulb or metal fuse link), and response sensitivity. Common K-factors are K-5.6 and K-8.0 depending on required flow.
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A sprinkler head is both the eye and the mouth of the system: it detects the fire and discharges water. The design: a brass or stainless body carrying a sealed orifice with a glass bulb or metal fuse link, a metal deflector that defines the spray pattern when the orifice opens, and a threaded neck for pipe connection. Direction types: pendant (hanging below a flat ceiling, umbrella spray downward), upright (standing on exposed piping in factories, water deflects off the deflector into a hemispherical pattern downward), sidewall (on walls where ceiling piping is not possible, lateral spray), and recessed/flush (hidden in the ceiling, decorative in premium buildings). Activation types: glass bulb (holds a liquid that expands with heat to shatter the bulb; color-coded for temperature: orange 57°, red 68°, yellow 79°, green 93°) and fuse link (a metal link that melts). Sensitivity types: standard response and quick response (QR) per the listed classification and response time index (RTI); QR heads have a lower RTI and are preferred in residential and hospital use. Selection by application: K-5.6 for light hazards, K-8.0 for ordinary hazards, K-11.2 or K-16.8 for high hazards (large warehouses). A technical note: a head is replaced after any activation and never reused; periodic visual inspection (annually from floor level per NFPA 25) confirms no bulb damage or dust buildup. Specifications follow NFPA 13, UL 199, and EN 12259.
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A sprinkler head is both the eye and the mouth of the system: it detects the fire and discharges water. The design: a brass or stainless body carrying a sealed orifice with a glass bulb or metal fuse link, a metal deflector that defines the spray pattern when the orifice opens, and a threaded neck for pipe connection. Direction types: pendant (hanging below a flat ceiling, umbrella spray downward), upright (standing on exposed piping in factories, water deflects off the deflector into a hemispherical pattern downward), sidewall (on walls where ceiling piping is not possible, lateral spray), and recessed/flush (hidden in the ceiling, decorative in premium buildings). Activation types: glass bulb (holds a liquid that expands with heat to shatter the bulb; color-coded for temperature: orange 57°, red 68°, yellow 79°, green 93°) and fuse link (a metal link that melts). Sensitivity types: standard response and quick response (QR) per the listed classification and response time index (RTI); QR heads have a lower RTI and are preferred in residential and hospital use. Selection by application: K-5.6 for light hazards, K-8.0 for ordinary hazards, K-11.2 or K-16.8 for high hazards (large warehouses). A technical note: a head is replaced after any activation and never reused; periodic visual inspection (annually from floor level per NFPA 25) confirms no bulb damage or dust buildup. Specifications follow NFPA 13, UL 199, and EN 12259.
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