Pendent Fire Sprinkler Head

Name: China Pendent Fire Sprinkler Head Manufacturers Suppliers Factory - Customized Service - CA-Fire Protection
Brand: CA-FIRE
SKU: 286576730

The pendent fire sprinkler head is a widely used automatic fire protection component, mounted under ceilings (suspended installation). It activates when its heat-sensitive element (e.g., 68℃ glass bulb) ruptures in a fire, discharging water to extinguish flames.
Featuring standardized flow coefficients (e.g., K5.6) and certifications like FM, it suits commercial/residential ceiling spaces, acting as a core part of automatic sprinkler systems for rapid fire suppression.

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Description

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How Is the K5.6 Flow Coefficient of FM K5.6-68 Pendent Sprinkler Determined?

Pendent fire sprinkler head

The K5.6 flow coefficient of the FMK5.6-68 pendent sprinkler stems from design and standardized testing. First, its internal flow path (outlet size, channel shape, etc.) is engineered for low-flow scenarios. Then, per FM/NFPA 13 standards, the sprinkler is tested at 0.1MPa (standard pressure): its actual output (≈17.7 L/min here) is measured.

Using the formula \(Q = K \times \sqrt{P}\) (Q=flow, P=pressure), the K value is derived as 5.6. Finally, FM certification validates this K5.6's consistency and compliance across production units.

Key Compatibility Parameters for Replacing Sprinklers with FMK5.6-68 Pendent Type

To replace existing sprinklers with the FMK5.6-68 pendent type, several system parameters must match:

Flow coefficient (K-value): K5.6 must align with the original sprinkler's K, as it dictates water flow (via \(Q = K \times \sqrt{P}\)), ensuring proper pressure balance.

Activation temperature: 68°C needs to match the original, preventing premature/late activation during fires.

Mounting type: Pendent installation must match the original setup to ensure correct water distribution.

System working pressure: The sprinkler must accommodate the system's pressure range.

Certification (e.g., FM): It must meet the system's regulatory compliance requirements.

Fire Temperature Rise Rate Ranges for 68℃ Pendent Sprinklers

Slow Temperature Rise Indoor Spaces

Slow temperature rise spaces feature gradual heat accumulation due to enclosed, low-airflow environments, with fire heat spreading at a rate of 1–2℃ per minute in the early stages. Examples include residential bedrooms, office private lounges, and storage rooms with low-pile fabrics. The 68℃ pendent sprinkler is ideal here: its heat-sensitive glass bulb can reliably detect the slow temperature climb without premature activation. Compliant with FM and NFPA 13 standards, it ensures timely water discharge before the fire escalates, protecting areas where occupants may have limited early-warning awareness of smoldering fires.

Moderate Temperature Rise Commercial Halls

Moderate temperature rise areas see heat spread at 2–4℃ per minute, driven by moderate airflow and mid-density combustibles, such as retail store sales floors, hotel lobbies, and restaurant dining areas. These spaces often have mixed materials (wooden fixtures, fabric decorations) that generate steady heat post-ignition. The 68℃ sprinkler's activation threshold balances responsiveness and stability: it avoids false triggers from HVAC system heat or crowd body heat, while activating quickly enough to suppress fires before they spread to adjacent merchandise or seating zones, aligning with commercial fire safety code requirements.

Standard-Rise Office & Public Corridors

Standard temperature rise corridors and open office areas have a heat escalation rate of 1–3℃ per minute, characterized by unobstructed air circulation and low-to-moderate combustible loads (paper documents, plastic office supplies). The 68℃ pendent sprinkler's design is tailored to this scenario: its downward-spray pattern covers corridor widths and office cubicle layouts effectively. Its activation temperature matches the typical ambient temperature ceiling of these spaces (20–25℃), ensuring it only triggers when fire-related heat accumulates, safeguarding high-traffic areas where rapid evacuation and fire containment are critical for occupant safety.

Low-Rise Light Industrial Auxiliary Zones

Light industrial auxiliary zones (e.g., tool storage rooms, packaging prep areas) have a heat rise rate of 1–2.5℃ per minute, with combustibles limited to small quantities of cardboard, plastic packaging, and metalworking lubricants. These spaces often have lower ceiling heights (2.5–3.5m) and intermittent equipment heat. The 68℃ pendent sprinkler's FM certification validates its performance in such environments: it resists false activation from occasional equipment overheating, while its K5.6 flow coefficient delivers sufficient water to extinguish small, slow-burning fires before they reach production areas, maintaining industrial operational continuity and safety compliance.

pendent Fire Sprinkler Head-Technical Parameter

Specification	pendent Fire Sprinkler Head Details
K Factor	K=5.6(K80)
Thread Size	R₂1/2"-1/2"NPT
Type	Upright/Pendent/Sidewall
Glass Bulb Diameter	5mm/3mm
Frame Finish	Chrome Plated,Brass
Deflector Finish	Chrome Plated,Copper; pendent is SS material
Certificate	FM
SIN	NF3151/NF3251/NF3351/NF3131/NF3231/NF3331