FAQ: Fire Protection Solution   

1)       Do we have any compliances and guideline for fire protection system in Bangladesh?

Yes, we have standard guideline and compliance from Bangladesh National Building Code (BNBC), which was primarily designed from National Fire Protection Association (NFPA).


2)      What is an automatic fire sprinkler system?

The automatic fire sprinkler system is the most widely used fire protection system today. The whole philosophy of sprinklers is based upon the premise of applying the right amount of water (as little as possible) in the right place (the seat of the fire) at the right time (as quickly as possible).


3)      Why are sprinklers important for life safety?

Sprinklers do not rely upon human factors such as familiarity with escape routes or emergency assistance. They go to work immediately to reduce the danger. Sprinklers prevent the fast developing fires of intense heat which are capable of trapping and killing dozens of building occupants.


4)      How does the fire sprinkler system effectively work?

Fire sprinklers are heat activated devices. Only those closest to a fire will ever open. More than 90% of all fires are controlled by four sprinklers or less, with each sprinkler flowing about 25 gallons per minute. Contrast that with the hundreds and even thousands of gallons per minute which fire fighters would use once they arrive.


5)      How much water damage can be occurred from fire sprinkler system?

Water damage from a fire sprinkler system will be much less severe than the damage caused by water from fire-fighting hose lines or smoke and fire damage if the fire goes unabated.


6)      Can a sprinkler go off accidently?

It is possible, but it rarely happens. Unless sprinklers are subjected to freezing, overheating, or mechanical injury, loss records show that only once in every 16 million years of service will a sprinkler accidentally open.


7)      Can we choose any fire detectors such as heat/smoke/flame/rate of rise detector in any places?

No single detector is able to meet the need of all types of fires and all types of occupancies.  For example, smoke detectors are not naturally suitable in places where the production process produces smoke.


8)      Will it be sufficient to install a single electric pump to supply water to firefighting equipment?

No, a secondary fire pump shall be installed which can be operated by dedicated generator or by alternative power supply.


9)      Do the fire protection equipments need maintenance after installation?

Yes, the system shall be maintained for safe operating conditions and tested at least once a year. Also minimum stock of six spare sprinkler heads shall be kept as per BNBC guideline.



FAQ: Cooling Tower


1)      What is a cooling tower?

A cooling tower is a heat rejection device, which extracts waste heat to the atmosphere though the cooling of a water stream to a lower temperature.


2)      How does it work?

There are two primary mechanisms by which water is cooled inside a cooling tower. Sensible heat transfer takes place when the incoming air temperature is lower than the temperature of the incoming water, thus heat from the water is absorbed by the colder air. If that were the only cooling that took place inside a cooling tower, the cold-water temperature would be limited by the ambient temperature. However, the bulk of the cooling that takes place inside the cooling tower (>95%) is driven by evaporation of the water itself. Evaporation requires energy (heat), so when water is evaporated within the fill media in a cooling tower, heat is removed with the water vapor and leaves in the exiting air stream from the top of the tower. The result is that the remaining water is cooled significantly, even to temperatures below the actual ambient temperature.


3)     What are the general applications of cooling tower?

Cooling Towers are generally used for Air Compressors, Autoclaves, Chillers, Condensers, Cooling Rolls, Degreasers, Die Casting, Dynamo-meters, Heat Exchanger, Hydraulic Oil Coolers, Induction Furnaces, Ink Coolers, Kettle Reactors, Oil Coolers, Quench Cooling, Reactors, Spot Welders, Vacuum Pumps.


4)     What kind of maintenance is required for the good performance of a cooling tower?

a) Inspection for clogging – Make sure water is flowing in tower.

b) Fan motor condition – Check the condition of the fan motor through temperature or vibration analysis and compare to baseline values.

c) Check motor supports and fan blades – Check for excessive wear and secure fastening.

d) Motor alignment –  Align the motor coupling to allow for efficient torque transfer.

f) Clean tower – Remove all dust, scale, and algae from tower basin, fill, and spray nozzles.


FAQ: Axial Fan


1)      What are axial fans?

Axial fans are one kind of heavy duty exhaust which are mostly used for spot cooling and ventilation in areas.


2)     What are the fan blades are made of?

Fan blades are normally made of aluminium sheets, but nowadays another element called GF66 is used which is more robust and much more flexible than aluminium.


3)     What is flow rate?

Flow rate is the amount of air that passes through the Fan in a certain time (1 min). In other words, it is the amount of wind that the Fan produces.

Unit:  Cubic meter per hour or CMH




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