【 Weak current College 】 sprinkler system settings for several common problems

With the socio-economic development and the improvement of the fire code requirements, fire sprinkler system for fire extinguishing success rate is high and in dance and entertainment industry, tall buildings, industrial production and other fields, but our daily fire inspection and engineering acceptance process discovered some impact on system reliability, even paralysis of the system.

First, the nozzle. Some units in the interior decoration and automatic sprinkler system installation, decoration and automatic sprinkler system installation team, the mismatch between disjointed, their own design drawings, results often automatic sprinkler systems of nozzle after installation is complete, the renovation team but because decorated modeling, lighting settings, and other local shelter impact sprinkler nozzles or even completely. As of June 2007 in the city a fire sprinkler system for restaurants, found that acceptance of suspended ceiling under section head close to the more prominent than the lamps or decorative molding installation splash plate, nozzle is blocked, to decoration and sprinkler systems in charge of the construction of the two parties, who eradicated, sprinkler system installer official said the ability to install prior to renovation team officials said their construction by decoration figure, neither willing to bear the rework losses. Coordinated by the party after the proper solution to rework. Nozzle protection, on the other hand is incorrectly; some units system nozzle after installation, the renovation team to replace the suspended ceiling scraping paint, because lack of nozzle component working conditions of the coatings, paints, etc. attached to the closed-head of liquid components, resulting in closed sprinkler temperature cannot be correct, extend the fire action time.

Second, eqnipment aspects. One is eqnipment not complying with the specifications set in the most negative point, but rather to take care of drainage set in and not at the end of the toilet. The second is the eqnipment settings in corridor, a room or toilet ceiling, test water very inconvenient. As of 2006 in a supermarket on the Shishou city automatic sprinkler systems acceptance process, we found that the system set in at the end of the test water container within the supermarket just above, once the test water may cause damage to the goods in the supermarket, don't test water we could not test the reliability of the system, so we ordered the construction of the reform party. Third, do not use the eqnipment, but instead with the ball valve, DN25 its path is better than a 25mm, nominal size as 15mm (the actual aperture for 11mm) nozzle to much of the water after its opening is greater than a standard nozzle of displacement, it is clear that such a test water device cannot represent a nozzle opening effect, eqnipment open water flow must be equivalent to the fire zone 1 only nozzle flow, its test results to meet the test.

3. roof problems. First, there is no roof; some units excuse the roof load factor minus roof water tank, water tank and pump room only, and no set-pressure water supply device, causing a fire sprinkler system. Second, the roof without alarm valve directly access system for water distribution; causing alarm valve of hydraulic pressure switch, the alarm does not sound the alarm, sprinkler pump does not start on time, even when the fire broke out on the roof tanks of water sprinkler system after without water available, directly affect the efficiency of fire suppression system.

IV. system pump aspects. One is the extremely humid underground station on the pump and in the same room of the pump control cabinet, etc cause great harm, such as the control cabinet devices voltage breakdown, component corrosion. So you want to do a water repellent treatment of underground pumping stations, or additional dehumidification drying equipment; second, the underground Cistern and the pump room is not set, when drainage pump pump house pump inlet water flooding accident that caused the accident.

5. the system pressure, pressure relief aspects. One is to not install safety relief valves and drop pipe, lead on the pump when the sprinkler pump to the closed state of wet sprinkler system piping pressure, pressure too large can easily lead to closed sprinkler leakage, explosion phenomena occur, the system cannot be debugged, safe and guaranteed. Second, it is not appropriate to use automatic sprinkler pump. Either choose pump power is too small to reach the work pressure, either choose power, head, flow too large pump, causing low floor nozzle for overpressure burst.

6. power supply connection problems. A sprinkler system does not use a dedicated power supply circuit, but with production, domestic electricity share or mixed laying occurs after the system was off the fire and unable to work. Second, the system power supply when the downlead did not wear a metal pipe protection, simply put the flame retardant casing to deceive the public, when fire-retardant casing when susceptible weights fall crush resulting system power supply is interrupted. The correct method should be the downlead line wear metal pipes for fire protection. The above problem would cause automatic sprinkler system design, construction, the use of units and the fire of supervisory bodies, so that high-tech products truly high extinguishing efficiency.