Fire alarm equipment maintenance experience

Fire alarm equipment maintenance experience

1 Introduction

With the rapid development of the national economy, more and more modern high-rise buildings, people's awareness of fire safety is gradually increasing, attaching great importance to the installation of automatic fire alarm system, but often ignore the maintenance work after the system is put into operation. As the system is put into operation, the aging of equipment and lines will inevitably occur. If the system cannot be maintained in time, in the event of a fire, the fire system will not operate normally, which will cause immeasurable losses. The lessons in this regard are not uncommon. The Order No. 61 of the Ministry of Public Security requires the unit to inspect and maintain the fire protection facilities of the building. At present, the Regulations on the Administration of Building Fire Fighting Facilities (tentative name) is being formulated.

2. Change of source, cleaning and electrical parameters of the smoke detector In the early stage of the fire, the fire detector transmits the detected fire information to the fire alarm host in time, and the host emits an audible and visual alarm signal to connect the fire protection facilities in parallel, so the detector is guaranteed. The normal work is crucial.

Point-type smoke detectors are mainly divided into two types: ion-sensing smoke and photo-electricity smoke. Because there are radioactive sources in the ion-sensing smoke detector, if improperly handled, it will pollute the environment. Therefore, in recent years, manufacturers have basically produced photo-electricity smoke detectors. Mainly. However, ion smoke detectors in the detectors currently in use also account for a considerable proportion.

According to the regulations of the Ministry of Public Security of the People's Republic of China on the Construction and Acceptance of Fire Automatic Alarm System (GB 50166-92), after the detector has been put into operation for 2 years, it should be cleaned every 3 years. Taking the ion detector as an example, the floating dust in the air adheres to the surface of the radiation source and the ionization chamber, so that the ion current in the ionization chamber is weakened, the detector is easy to be falsely reported, and the moisture and floating dust in the air will slowly corrode the radiation source. If the source in the ionization chamber is corroded to a greater extent than the source in the reference chamber, the detector will be prone to false alarms. Instead, the alarm is delayed or not. In addition, the parameter drift of the electronic components in the detector can not be ignored, and the detector after cleaning must be adjusted for electrical parameters. The English word for detector cleaning is “Overhaul”, which translates to “complete overhaul”. After the detector is changed by source, cleaning and electrical parameters, its index reaches the indicator of the new detector when it leaves the factory. Therefore, in order to ensure the long-term normal operation of the detector, it is necessary to send the detector to a professional cleaning factory for thorough overhaul.

3, fire alarm controller cleaning, software backup and safe power supply

3.1 Fire alarm controller During the long-term use, a large amount of dust will be adsorbed on the circuit board of the fire alarm controller. Excessive dust will affect the heat dissipation of the circuit board. In the case of moisture, a short circuit may occur, so clean it regularly. The alarm control machine is very necessary.

3.2 The local decoration and renovation of large buildings are frequent, and the user software of the fire alarm control machine is also changed. Some manufacturers produce control machines that rely on lithium batteries to save user software. In the case of lithium battery failure and alarm control machine power failure ( There are other reasons, such as misuse, main card damage, etc., which will cause software loss. The work of restoring the control software is very cumbersome, so it is very important to back up the user software regularly.

3.3 When the main power fails, the backup battery can ensure that the control machine continues to work for a certain period of time. The backup battery generally adopts maintenance-free battery, and its life span is 3-5 years. The battery should be tested regularly with a special battery tester, and the failed battery should be replaced in time to ensure the safe power supply of the fire control machine.

4, detector smoke function test in large buildings, the number of detectors is large, the detector test generally uses the sampling method, sampling should pay attention to the following aspects:

4.1 Record the address of the tested detector to avoid repeating the test of the same point in the next test. Test all detectors after several tests in a year.

4.2 During the smoke test, the delay of the detector alarm should be recorded. Through the final summary, the working status of the detector in the whole building should be roughly understood, and the evidence for whether the detector is cleaned can be provided.

4.3 The address of the detector should be checked for accuracy in the test. A unit fire protection system has been running for 6 years, there is a room alarm, and the alarm control machine displays the address of the next room, which shows the importance of checking the alarm address.

5, anti-smoking, smoke exhaust system inspection and functional test anti-smoking, smoke exhaust system consists of positive pressure air supply valve, exhaust valve, air duct, fire fan, positive pressure air supply is to prevent smoke into the evacuation area, and smoke exhaust system It is an important guarantee for the evacuation of smoke from the building.

5.1 Firstly, it is observed whether the valve body is closed tightly, and a large number of valve bodies are not tightly closed, which will affect the effect of exhausting smoke or blowing air. After the detector alarm is linked, the valve body should be open when it is opened. Otherwise, it should be repaired in time to avoid the valve opening angle is not enough or can not be opened at the time of the fire. The above problems are common, and the reason is generally that the quality of the valve is not good, or Improper installation and attention should be paid during the maintenance process.

5.2 After the valve is actuated, check the return signal of the fire control room, and at the same time, it should be able to start the fire fan. Since one fan is used for multiple valves, the condition of the interlocking fan after each valve body action should be checked. This is often overlooked. A unit's fire protection system has been in operation for many years, and it is still found that there is a smoke exhaust valve after the test. The phenomenon that the fan does not start, after checking that the valve linkage fan is not programmed. In the large-scale fire-fighting system, due to the large amount of user software, the above-mentioned phenomenon is negligible by the commissioning personnel. Therefore, careful work should be done during the maintenance and repair process to achieve the purpose of perfecting the system.

5.3 Testing of fire-fighting fans In addition to the automatic functions, the remote direct-start function of the fire-fighting center and the on-site start-up function of the fan's electric control cabinet should be tested, and the return signal should be checked.

6. Functional testing of fire shutter doors and fire doors Fire shutter doors and fire doors are fire separation devices that prevent the spread of smoke and fire.

6.1 The fire shutter on the evacuation passage shall have a half-drop and full-drop function. The fire curtain used as the fire separation shall be in one step after the detector alarm. The test shall meet the above requirements and check the return signal address. After the fire shutter door is operated, it should be noted whether the descending process is stable, whether there is any obstruction, and whether it is strict after the bottom is lowered.

6.2 After the fire door is started, it should be noted that the two doors are closed in order.

7. Functional test of fire alarm bells and fire accident broadcasts There are usually multiple alarm bells or speakers on each floor of the building. In the test, the sound should not be heard, but ensure that each bell or speaker works properly.

8. Functional test of fire water system

8.1 Test the water flow indicator through the end water discharge, and the fire hydrant start pump button should also be tested, and it is better to test all the times every year.

8.2 The fire pump has three starting modes, namely, the pump control cabinet is started on site, automatically started, and the fire control room is remotely started. All of the above three methods should be tested and the address of the return signal checked.

9 Enhance fire protection awareness and improve maintenance quality With the gradual enhancement of people's fire protection awareness, the maintenance and repair work of fire protection systems has received more and more attention. Many units have contracted the maintenance and repair work of fire protection systems to qualified fire protection companies. The quality of the repair service is related to the fire safety of the entire building. The author would like to say a few points.

9.1 The intelligent automatic alarm equipment and the software technology content are getting higher and higher. The maintenance company should first contact the manufacturer to obtain technical support for the equipment that is not familiar with it, and at the same time ensure the supply of spare parts.

9.2 Before the start of maintenance work, the fire protection facilities in the entire building should be fully understood, and the linkage mode of various fire fighting equipment should be mastered to avoid adverse consequences. If a hotel's fire-fighting fan starts, it must stop at the fan room, and the maintenance personnel do not grasp this situation. After the fan is linked, it cannot be stopped in time, so that a lot of dust is blown into the stairwell.

9.3 Maintenance work can not be "repaired" light "dimensional", only satisfied that the faulty equipment is repaired properly. In fact, the role of maintenance is equally important, it can eliminate potential hidden dangers. For maintenance, the high-voltage control cabinets such as fans and pumps should be inspected to repair or replace the aging devices in time. In the test, it is often encountered that the device does not work properly due to device aging.

9.4 The longer the system is running, the more problems with aging and poor contact. Pay attention to the maintenance of alarm and control lines, especially the terminal box should be inspected to eliminate hidden dangers. A unit maintenance personnel inspected the total terminal box and found that more than 40 of the more than 1,000 pairs of lines were loose. When testing the water pump, it was found that the starting voltage of the 24V DC relay in the electric control cabinet was only 16V, and the relay could not operate. After investigation, the terminal box in the underground two-layer tube well is rusted due to a large number of wet terminals, and the voltage at the joint increases, causing voltage attenuation, which shows the importance of maintenance of the line.

10, the conclusion

At present, there is no uniform regulation for the maintenance and repair of fire-fighting facilities. The maintenance procedures and priorities of various fire protection companies or units are also different. I hope that everyone can communicate with each other, learn from each other's strengths, and do a better job in fire maintenance.

SS Multiple Tubes UV Sterilizer

Multiple Tubes Uv Sterilizer ,Uv Sterilizer For Swimming Pool,Uv Sterilizer For Drinking Water,Uvc Sterilizer For Fish Pond

Foshan Kingrate Optoelectronic Technology Co., Ltd. , https://www.kingrateuv.com