Ask a question about the emergency pump of fire fighting machinery

When the fire pump cannot be started automatically or manually due to the fault of the signal line or the control line of the fire pump control box, the fire pump is started by directly and manually closing the main contactor of the fire pump through the mechanical emergency starting device on the door of the fire pump control box.

It is necessary to draw the following conclusions through the "Code for the Design of Automatic Fire Alarm System" and the interpretation of the provisions and practical experience

1. The action signal of the fire hydrant button, and the alarm signal of any fire detection signal or manual alarm button in the alarm area where the fire hydrant button is located, the two signals are sent to the fire alarm linkage controller (host), and then the pump control cabinet is sent to start the pump, which is linkage.

2. The fire hydrant pump is transmitted to the pump control cabinet by the low-pressure pressure switch or the high-level water tank flow switch at the main pipe of the pump, and the control cabinet sends a pump signal to the fire pump to start the pump directly, which is direct control, and the line does not pass through the fire control room, so the linkage controller of the fire control room does not matter if it is manual and automatic, but the fire control cabinet should be in an automatic state.

2. This is not redundant, the fire protection design is to adopt a redundant design, and adopt a variety of functions to start the pump. Just as there are many ways to start the pump: 1. Linkage mode (2 signals); 2. Flow switch (automatic), 3. Low pressure pressure switch (automatic).

4. Multi-line control panel (elimination control room). 5. Start the pump manually on site. 6. Mechanical emergency start.

So it is necessary to set the fire hydrant button alarm button.

3. The pressure switch you said will start the pump as soon as it moves, this statement is not correct, it is not the low-pressure pressure switch that acts first, it is the flow switch that acts first than the pressure switch, as long as there is water flow, the flow will send a signal to the pump control cabinet at the beginning. The low-pressure pressure switch will not start the pump until the water level of the high-level tank rises (the pressure drops), and this time is relatively long.

4. The fire pump should not be equipped with the control function of automatic pump stop, and the pump stop should be determined by the staff with management authority according to the fire fighting situation. This is a strong article, in the previous engineering practice found that the existing project often sets up automatic pump stop control requirements, which may cause the failure or setback of fire fighting, because the supply of fire water source at the fire site has many water replenishment measures, and there is no water after the water supply of the fire continuation time of 1h 6h is not designed, if the pump is suddenly automatically turned off, it will also cause certain danger to the firefighters who fight the fire at the scene, so the automatic fire pump stop is not allowed, Only the personnel with management authority determine the stop of the fire pump according to the fire fighting situation.

5. When the manual control button on the fire hydrant pump control cabinet is played manually, it cuts off all external signals, so the specification stipulates that the fire pump control cabinet should make the fire pump in the automatic pump state, which is also a strong strip. The manual buttons must be effective only in the field, and the operation of the multi-line control panel must also be carried out in the automatic state of the pump control cabinet.

Article 1, see the "Design Code for Automatic Fire Alarm System" and the explanation of the provisions, the signal of elimination can be used as the alarm signal of the fire position and the trigger signal of the linkage start of the fire pump, and the linkage start pump is realized through the linkage input and output module of the host. The detector plus the signal to determine the location of the fire is more accurate, and the way to start the pump with the linkage module is usually faster than the pressure switch or flow switch, because the fire hydrant system will have a high-level water tank, a pressure stabilizing pump, etc.

Article 2, the stop of the fire pump is realized by the stop button of the fire pump control cabinet, the remote control stop pump button of the control room or the linkage stop pump control module, etc., and the latter two ways generally require the fire pump control cabinet to be realized in an automatic state.

Summary. <> pro

Hello, I'm glad to answer for you. Generally speaking, a 90 kW fire pump needs to be driven by an electric motor, and mechanical emergency start can be difficult. However, if the needs of mechanical emergency start are taken into account in the design, some special design measures can be adopted, such as the use of diesel engines or hand-cranked starting devices, etc., to achieve mechanical emergency start.

The specific implementation needs to be designed and selected on a case-by-case basis.

Can a 90 kilowatt fire pump be mechanically activated in an emergency?

<> pro

Hello, I'm glad to answer for you. Generally speaking, a 90 kilowatt fire pump needs to be driven by an electric motor, and it may be difficult to start the emergency in the early morning with the state. However, if the needs of mechanical emergency start are taken into account in the design, some special design measures can be adopted, such as the use of diesel engines or hand-cranked starting devices, etc., to achieve mechanical emergency start.

The specific implementation needs to be designed and selected on a case-by-case basis.

Qinqin Prefecture contains Li <>

There is also some extended knowledge that can help you: In addition to mechanical emergency starts, there are other ways to deal with fire pump motor failures. 1.

Standby power supply: Set up a backup source in the fire pump room, such as a generator set or UPS book delay source, in case the motor fails. 2.

Manual starting device: Set up a manual starting device, such as a hand-cranked starting device or a manual switch, in the fire pump room in case of motor failure. 3.

Parallel operation: Multiple fire pumps are set up in the fire pump room and run in parallel in case a single fire pump motor fails. 4.

Regular maintenance: Regularly maintain the fire pump motor, find and solve the fault in time, so as to reduce the possibility of failure. 5.

Spare motor: A spare motor is available in the fire pump room for replacement in case the motor fails. It should be noted that the above methods need to be considered and planned in the design of fire pumps to ensure that they can effectively cope with motor failures in actual use.

At the same time, it needs to be selected and implemented on a case-by-case basis.

The 90 kW fire pump can be mechanically emergency started. This kind of emergency starting mechanical device is usually directly started by an automatic engine of a certain size to start the fire pump, so that in the case of power failure or other fire pump shutdown in the site, it can provide the pump set with strong and necessary power to support its opening when necessary, so as to ensure the normal start of the pump set. The design of this type of emergency mechanical starting device should meet the requirements of the following aspects:

Able to meet the above requirements for emergency start-up; Equipped with sufficient engine power; The weight of the engine is light enough to move; It can realize the automatic opening and stopping of the fire pump through the automatic start monitoring system; Meet the reliability requirements, so that the fire pump can respond to the emergency situation in time.

Hello dear, fire pump is a kind of equipment that plays a key role in the fire, therefore, its emergency start function is very important. For a fire pump with 90 thousand pins of coarse tile, it should be able to meet the requirements of mechanical emergency starting. According to the national standard "Code for Fire Protection Design of Buildings" (GB 50016-2014), the fire pump should have a mechanical emergency start function, and it is recommended to set up a manual emergency start device.

In an emergency, the fire pump may need to operate in a power outage, so the mechanical emergency start function is very important. For a 90 kW fire pump, its emergency start function can usually be achieved by a mechanical starting device. According to the requirements of the standard, the mechanical emergency start loss device should be set at the location of the fire pump and be able to start manually.

It should be noted that the operating status of the fire pump should be checked to ensure that it can operate normally before the mechanical emergency start. In addition, the mechanical starter needs to be regularly inspected and maintained to ensure that it can reliably start the fire pump in an emergency.

The fire pump control cabinet should be equipped with a mechanical emergency start pump function, and should ensure that the fire pump is started in an emergency by the personnel with management authority when the control circuit in the control cabinet fails. When the mechanical emergency starts, it should be ensured that the fire pump works normally within 5min after the alarm.

The above provisions are mandatory and must be strictly enforced. Weak current signals such as pressure switches, flow switches and hard wires are automatically started by relays, if the weak current signal cannot automatically or manually start the fire pump due to faults or relay failures, the fire pump should be started by relying on the mechanical emergency start device set up in the fire pump room.

When the control circuit in the fire pump control cabinet fails and can not make the fire pump start automatically, if the repair of the line fault is immediately carried out will be limited by the quality of personnel and time, so it is impossible to carry out the emergency situation in the fire fighting, so the above provisions make the fire pump as long as the power supply is normal, regardless of how the control line can be forced to start, so as to ensure the timeliness of fire fighting.

The mechanical emergency start device must be carried out by authorized personnel during operation, and the time from the alarm to the normal operation of the fire pump should not be greater than 5min, which can include the time of the management personnel from the control room to the fire pump room, and the time from the start to the normal operation of the pump.

Figure 4-35 Fire pump and control cabinet

Figure 4-36 Mechanical emergency pump start-up device.

Answer]: C fire pump starting device and power device: 1

The starting device of the fire pump: 5) the fire pump control cabinet should be set up with a mechanical emergency start pump function, and should ensure that the control line in the control cabinet is disturbed by the personnel with management authority to start the fire pump in an emergency. When the mechanical emergency starts, it should be ensured that the fire pump works normally after the alarm.

Answer]: a, c

The mechanical emergency starting device of the fire pump is mainly composed of a contactor unit and a mechanical motion unit.

Dear, hello, how to remove the nuclear from the difficulty of starting the fire-fighting hand-lifted motor pump; Reasons why it is difficult or unable to start the pump: the pump is not filled with pre-moistened water before starting; There is sedimentation in the pump body and bearings. Exclusion Method:

Shut down and use after the voltage is stable; Any two of the three live wires should be transferred, and the beginning and end should be found and rewired; Check the leads, replace the leads; replace or move transformers closer to each other; New bearings should be replaced; adjust the mating clearance; Correction of pump shafts; Eliminate clutter; Add plenty of pre-moisturized water; Flush the water pump to remove debris. The voltage is on the low side; The steering of the electric motor is wrong, .Poor contact of motor terminal joints or wrong connection of the head and tail and intermittent turns; The wire diameter of the motor lead wire is too small or there are too many joints, and the resistance increases; The transformer capacity is not enough or it is too far away from the well pump; Damage to the ball bearings of the motor; The rubber pure cover bearing is too tight, and the clearance is too small; bending of the pump shaft; There are debris stuck in the impeller in the pump body