Foam Water pendent Type Sprinkler GS257

OPERATION

The operating principle of the Foam Sprinkler D15 is based on creating a concentrated foam liquid mixture from three main components: water, concentrated foam from the inlet connection tube, and air drawn from vents on the sprinkler. When activated by the smoke/heat detection system upon detecting a fire, the central control system will issue an alert by activating the alarm. If the temperature in the fire area reaches approximately 60-80°C, the Foam Sprinkler D15 will break, allowing water to spray out with gradually decreasing pressure. The automatic pump will be activated to supply water to the compound tank. As water passes through the pipeline, a signal will be transmitted to the fire alarm cabinet, and the solenoid valve will open. A portion of the water will be directed into the Foam tank, creating pressure within the foam container inside the tank, and this pressure will push the foam out through the nozzle.

SYSTEM DESIGN

• Determine the application rate.
• Estimate the number of sprinklers required.
• Determine the total system discharge flow.
• Estimate the water requirement.
• Determine the discharge time.
• Determine the size and type of hazard.
• Estimate the required quantity of foam.
• Determine the size and best type of proportioning system to be used.

 APPLICATION

The deluge foam water spray system is designed to protect against two-dimensional fires caused by flammable liquids. It is suitable for use in areas such as aircraft hangars, oil pumping stations, chemical storage facilities, warehouses, and oil loading and unloading areas.

MAINTAINANCE

Periodic inspection need to be made by authorized technical personnel. The nozzle must be checked for possible damage, obstruction or deposits of foreign objects externally and internally. If found the nozzles should be cleaned or replaced. The system must be operated with optimum water flow at least twice a year or as per the recommendation made by NFPA or as per authority having jurisdiction.

TECHNICAL DATA

Model: GS257

Inlet Size: 1/2’’ inch (DN15)

Working Pressure: 30-100psi

Material: Brass, Chrome Finish

Spray Pattem: Pendent /Low expansion foam discharge in spray pattern

K-Factor: 2.8

Orifice Dia: 8.25mm

Maximum Flow Rate: 31GPM

Installation Height: 0.9-3.9 meter

Foam proportioning: AFFF 3%, AFFF 6%, AR-FFF 3/3 hoặc AR- FFF 3/6

Min. Foam Application Rate: 0.2gal/min/Ft2

Max. Foam Application Rate: 0.3gal/min/Ft2

Activation: Heat-sensitive glass bulb (activates around 60–80°C)

Recommended Applications

• Aircraft hangars
• Chemical storage facilities
• Oil pumping stations
• Loading/unloading zones with flammable liquids
• Warehouses storing flammable goods