How to start the fire pump and how to deal with the noise
The starting methods of the fire pump can be divided into several starting methods, and each starting method has certain significance. When starting, you can choose from the following options. The starting relationship between the control room and the fire hydrant action button and the starting form of the fire hydrant pump related.

There are generally two ways to start the fire pump. One way is the diffusion bus mode. The start of the fire hydrant action button can be sent to the console of the fire control room according to the start signal of the fire hydrant linkage interface module located nearby. Fire hydrant activation switch output.

Directly output the switch of the fire hydrant action button to the fire pump starter box. These two starting methods can be used in the actual design. There is one method before wiring, but the address code programming of the fire hydrant linkage module should be performed under the bus system , to achieve the purpose of monitoring a large number of fire hydrants.

The latter method is simple and reliable, but the action signal of the fire hydrant needs to be fed back to the fire room. In the specific design, the designer can be selected according to the actual size of the actual project. The project scale is large and the construction form is complicated, so it can be used for the start of the former type. , the small size can be used after the start of work.

Pump noise is the irregular, intermittent, continuous or random noise generated by the pump during operation. The noise produced by the water pump will directly affect the lives of the surrounding residents, so how to eliminate the noise has become a crucial issue. Today, Shanghai Zibo Zhengji Pump Industry Co., Ltd. will teach you how to solve the noise of the water pump.

1. Distance noise reduction

The farther away the noise source is, the lower the noise will be. In the design, the water pump room should be set as far as possible outside the building and independently, so that it can be far away from the noise source. However, in reality, the water pump room is mostly set in the basement of the building, which requires us to There must be other methods.

2. Vibration isolation and vibration reduction can reduce noise

Isolate the noise source to isolate the noise generated by the water pump, and minimize the chance of the noise source being transmitted to other structures. The water pump is required to do a good job of vibration isolation and vibration reduction to isolate the vibration source caused by the pump work. At present, rubber vibration isolation pads and strong spring shock absorbers are commonly used; vibration isolation measures should be taken on the inlet and outlet pipelines of fire pumps, and rubber shock absorbers should be installed. Throat to reduce the noise transmitted along the pipeline. At the same time, the water distribution pipeline in the pump room must be equipped with vibration-isolated elastic supports to minimize the possibility of noise transmission. Vibration isolation and vibration reduction measures are effective in design and technical measures For a detailed introduction, relevant national standard atlases can be selected during design.

3. Sound insulation, sound absorption and noise reduction

The pump room located in an important building that requires noise should be further treated with sound insulation and sound absorption. Materials with good sound insulation performance should be used as building materials for the pump room, and materials with good sound absorption materials should be used for the walls of the pump room. Surface and roof are treated with sound-absorbing treatment to minimize noise.

Eleven Tips for Fire Pump Troubleshooting and How to Repair and Maintain
Fire pump does not turn on when starting

Reason: The packing is too tight or the impeller and the pump body are blocked by debris; the pump shaft, bearing, and leakage ring are rusted; the pump shaft is seriously bent. Remedy: Loosen the packing, dredge the water diversion tank: disassemble the pump body to remove debris or rust; correct the bent shaft or replace the pump shaft with a new one.

After starting, the water pump does not produce water

Reasons: There is air in the pump or gas accumulation in the water inlet pipe; the bottom valve is not closed tightly and the water is not filled, the vacuum pump packing is seriously leaking; the gate valve or flap door is not closed tightly. Remedy: remove debris, replace the damaged rubber pad, change the direction of the valve plate; press or replace the new packing, close the gate valve or flap the door; increase the amount of water until there is no air bubbles at the vent plug; replace the Cracked pipe water; reduce the head and press the nozzle of the water pump into the water 0.5 meters.

Insufficient flow

Reasons: the actual head of the fire pump exceeds the allowable head; the speed is not matched or the belt is slipping, and the speed is low; the installation angle of the blade of the axial flow pump is too small; the suction is too high; the bottom valve, pipeline and impeller are partially blocked or the impeller is defective; the outlet pipe Leakage is serious. Remedy: reduce the head, restore the rated speed, remove the dirt on the belt and adjust the belt tightness; adjust the blade angle, lower the installation position of the water pump; tighten the gland, seal the leak of the water pump, compress the packing or replace the packing; remove the blockage, Replace the impeller; replace the leak ring to block the leak.

The flow rate changes from large to small

Reason: The filter screen or bell mouth is gradually blocked by debris; the dynamic water level is lowered, and the submerged water depth of the water inlet pipe is not enough. Elimination method: remove sundries, increase the depth of the bottom valve into the water.

Overhaul and maintenance

1. After the fire pump is out of service, the remaining water in the pump and pipeline should be drained, and the internal soil should be cleaned to prevent the pump body and water pipe from bursting due to the freezing of accumulated water after freezing.

2. The iron castings such as the bottom valve and elbow of the fire pump should be cleaned with a wire brush, and then painted with anti-rust paint before painting, and then put them in a ventilated and dry place in the machine room or storage room after drying custody.

3. If it is driven by a belt, remove the belt, wash and dry it with warm water, and then hang it in a dry place without direct sunlight, and do not store it in a place with oil, corrosion and smoke. Under no circumstances should the belt be stained with oily substances such as engine oil, diesel or gasoline, and do not apply rosin and other sticky substances.

4. Check the ball bearings. If the inner and outer jackets are worn, moved, worn or spotted on the surface, they must be replaced. For those that do not need to be replaced, the bearings can be cleaned with gasoline or kerosene, coated with butter, and reinstalled.

5. Check whether the impeller of the water pump has cracks or small holes, and whether the fixing nut of the impeller is loose. If there is any damage, it should be repaired or replaced. If the impeller wears too much or has been damaged, it should generally be replaced with a new impeller. Partial damage can be repaired by welding, and the impeller can also be repaired with epoxy resin mortar. The repaired impeller should generally undergo a static balance test. Check the clearance at the impeller wear-reducing ring, if it exceeds the specified value, it should be repaired or replaced.

6. For pump shafts that are bent or severely worn, they should be repaired or replaced, otherwise it will cause imbalance of the rotor and wear of related parts.

7. Soak the removed screws in diesel oil, brush them with a steel wire brush, apply engine oil or butter, reassemble them or wrap them in plastic cloth and put them away (it can also be stored in diesel oil) to avoid rust or loss.

Fire pump fault elimination measures and how to set fire pump control

Usually in the maintenance process, the diagnosis of fire pump faults is a key link. Here are several common faults and elimination measures for everyone to diagnose fire pump faults in a targeted manner.

1. No liquid supply, insufficient liquid supply or insufficient pressure

1) The pump is not filled with water or not vented properly Elimination measures: Check whether the pump casing and inlet line are completely filled with liquid.

2) The speed is too low Elimination measures: Check whether the wiring of the motor is correct, whether the voltage is normal or whether the steam pressure of the turbine is normal.

3) The water head of the system is too high Elimination measures: Check the water head of the system (especially the friction loss).

4) Suction lift is too high Elimination measures: Check the existing net pressure head (too small or too long inlet pipeline will cause great friction loss).

5) The impeller or pipeline is blocked Elimination measures: Check for obstacles.

6) The direction of rotation is incorrect Elimination measures: Check the direction of rotation.

7) Air is generated or there is leakage in the inlet pipeline Elimination measures: Check the inlet pipeline for air pockets and/or air leakage.

8) The stuffing or seal in the stuffing box is worn, causing air to leak into the pump casing Elimination measures: Check the stuffing or seal and replace it if necessary, check whether the lubrication is normal.

9) Insufficient suction head when pumping hot or volatile liquid Elimination measures: Increase the suction head and consult the manufacturer.

10) The bottom valve is too small Elimination measures: Install a bottom valve of the correct size.

11) The immersion depth of the bottom valve or the inlet pipe is not enough Elimination measures: consult the manufacturer for the correct immersion depth. Use baffles to eliminate eddy currents.

The first interface control method: the fire module outputs DC24V active signal control (that is, the fire module logic starts the pump, according to the principle drawing of the control cabinet provided by the manufacturer, this control method can realize the mutual switching function of the main and standby pumps, that is It is reasonable to use a module to control the automatic start-up pump. We believe that this control method can meet the relevant fire protection regulations).

The second interface control method: emergency control (from the fire control center to the pump control cabinet): is this emergency control method controlled by the water pump control cabinet (each pump control cabinet only uses a set of hard pull wires for control), or According to the water pump control (leave one interface for each pump and use three sets of hard pull lines to control the start and stop of the three pumps respectively)? To make this control method clearer, I would like to ask: Does the "fire emergency control (hard pull line control)" need to be controlled by the mutual switching circuit in the pump control cabinet or directly through the respective pump buttons of the fire control center to forcibly start the pump? If the fire control center button is used to forcibly start the pump, can it pass the fire department's acceptance? If it fails, where is the relevant specification to prove this problem?

The third interface control method: through the pressure switch on the alarm valve to start the pump, this control method is not considered for the time being, and it is just a control description here.

The fire pump starts usually in the following ways:

1. The fire pump control cabinet in the pump room starts the pump directly.

2. The multi-line module of the fire alarm host is activated. There is a multi-line control panel on the panel of the alarm host, and the corresponding start and stop buttons are on it, which is the first situation you mentioned.

3. Control the start and stop of the pump by relying on the change of the pipe network pressure, including: electric contact pressure gauge, pressure switch, etc. This is the case. This is the third case you mentioned.

Fire pump power saving measures and how to make the fire pump run smoothly
1. Adopt high-efficiency and energy-saving water pumps and high-efficiency and low-loss motors, and improve the efficiency of transmission devices.

2. Correctly select the power of the pump motor. Prevent "big horses and small carts". Replace the overcapacity water pump motor. When the power of the motor is much greater than the actual need, the method of replacing the motor can be used to save electricity.

3. Choose a reasonable lift. When the head of the pump leaves too much margin. It will waste electric energy, so the head of the pump's operating point should be reasonably determined. 4. Reduce pipeline resistance. Eliminate redundant pipe fittings, unnecessary turns and sharp angles on the pipeline to reduce pipeline resistance and reduce unit power consumption for water delivery.

The methods to reduce pipeline resistance include:

①. Pipeline design should be reasonable.

②. Increase the pipe diameter or use double pipe drainage to reduce the flow rate.

③. Shorten the length of the pipeline as much as possible, reduce joints, elbows and valves, and especially avoid the appearance of sharp angles.

④. Improve the smoothness of the inner wall of the pipeline or add a coating.

⑤. Remove the dirt on the inner wall of the pipeline in time.

5. Water pump speed regulation saves electricity. The power consumption of the water pump is proportional to the cube of the speed of the unit, so the speed of the unit should be changed according to the actual load conditions. Can greatly save electric energy. Adopting pump speed regulation measures, the initial investment is relatively large, but the power saving effect is remarkable, especially suitable for large-capacity water pumps. It should be noted that the larger the head, the flatter the resistance curve, even if the speed changes slightly, the flow rate will change greatly, and the power saving effect is poor.

6. Transform the pump impeller. When the flow rate of the pump in use is larger than the actual flow rate required, and the speed control cannot be used or the price of the speed control device is uneconomical, the impeller of the original pump can be turned or replaced to reduce the flow rate and Head, in order to reduce the running power consumption of the pump.

If the feedwater pump is designed using the same conversion method, after obtaining the speed n of the required operating conditions, the individual arcs of the corresponding operating conditions can be converted according to the formula: or the rotating speed and multi-stage The characteristic curve of the fire pump's initial and final operating conditions is the first step in the design and calculation of the feed water pump. In order to make the feed water pump run quietly and reliably under all operating conditions, the extremely serious condition is to ensure that no cavitation occurs under each operating condition, and the guarantee condition for no cavitation should be given by the front Booster pump supply for the water pump. Design and calculation of pre-boosted fire pump The pre-boosted pump is referred to as the booster pump for short, it is placed before the suction of the boiler feed water pump, and provides the feed water pump with sufficient suction pressure to avoid cavitation under operating conditions . Before designing and calculating the booster pump, it is necessary to first confirm the design calculation flow and head value of the single-stage fire pump. It is precisely because of the connection between the booster pump and the feedwater pump that the exact design and calculation parameters of the booster pump are all related to the corresponding working condition parameters of the feedwater pump.

The impeller is eccentrically installed in the pump body. When the impeller rotates according to the correct direction, the water entering the fire pump body is thrown to the limit by the impeller. Due to the influence of centrifugal force, the water forms a uniform thickness similar to the pump cavity. closed water ring. The upper inner surface of the water ring happens to be tangent to the impeller hub, and the lower inner surface of the water ring just meets the top of the blades (actually, the blades have a certain insertion depth in the water ring). At this time, a crescent-shaped space is formed between the hub of the impeller and the water ring, and this space is divided into several small cavities equal to the number of blades by the impeller. If starting from the upper part of the impeller at 0°, then when the impeller of the fire pump rotates 180° before the rotation, the volume of the small chamber gradually increases from small to large, the pressure decreases continuously, and it communicates with the suction port on the suction and exhaust pan , when the pressure in the small chamber space is lower than the pressure in the pumped container, according to the principle of gas pressure balance, the pumped gas is continuously drawn into the small chamber, and it is in the process of inhalation.

When the inhalation is completed, it is isolated from the inhalation port, the volume of the small cavity is gradually decreasing, and the pressure is continuously increasing. exhaust. And the volume of the small cavity communicated with the exhaust port further reduces the pressure to further promote. When the pressure of the gas is stronger than the exhaust pressure, the compressed gas is discharged from the exhaust port. During the continuous operation of the pump, Continuously carry out the process of suction, compression and exhaust, so as to achieve the purpose of continuous pumping.

In the water ring pump, the auxiliary exhaust valve is a special structure, generally using a rubber ball valve, its function is to submerge the phenomenon of over-compression and under-compression generated during the operation of the pump. Both phenomena will cause excessive power consumption. In order to solve this problem, a rubber ball valve is generally installed under the exhaust port, so that when the fire pump chamber reaches the exhaust pressure prematurely, the ball valve will automatically open and the gas will be discharged, eliminating the over-compression phenomenon. Generally, when designing a water ring pump, the minimum suction pressure is used to determine the compression ratio, so as to determine the starting position of the exhaust port, so as to solve the phenomenon of insufficient compression.

Maintenance and maintenance and troubleshooting methods between fire pump and fire hydrant pump system

1. The fire water supply and fire hydrant system should have operating procedures for management, inspection and testing, and maintenance; and the system should be guaranteed to be in a quasi-working state. Maintenance management should be carried out according to the requirements in the table.

2. Maintenance and management personnel should master and be familiar with the principle, performance and operating procedures of the fire water supply system.

3. The maintenance and management of water sources shall comply with the following regulations:

(1) The pressure and water supply capacity of the municipal water supply network should be monitored every quarter;

(2) The normal water level, low water level, flood level, and low water level flow or water storage capacity of natural rivers and lakes and other surface water fire-fighting water sources should be tested once a year;

(3) The normal water level, minimum water level, maximum water level and water output of groundwater fire-fighting water sources such as wells should be measured once a year;

(4) The water level of fire-fighting water source facilities such as fire-fighting pools, high-level fire-fighting pools, and high-level fire-fighting water tanks should be tested once a month; the angle valves at both ends of the glass water level gauge of the fire-fighting pool (box) should be closed when the water level is not observed;

(5) In winter, the indoor temperature and water temperature of the fire-fighting water storage facilities should be tested every day. When freezing or the indoor temperature is lower than 5°C, measures should be taken to ensure that there is no freezing and the room temperature is not lower than 5°C.

4. The maintenance and management of water supply facilities such as fire pumps and pressure stabilizing pumps shall comply with the following regulations:

(1) The fire pump should be started manually once a month, and the power supply should be checked;

(2) The fire pump should be automatically started once a week to simulate the automatic control conditions of the fire pump, and the automatic inspection situation should be automatically recorded, and the inspection record should be recorded every month;

(3) Check and record the operation status of the pressure stabilizing pump on a daily basis, such as the pump stop and start pressure and the number of pump starts;

(4) The electric quantity of the starting battery of the diesel engine fire pump should be tested every day, the oil storage capacity of the oil storage tank should be checked every week, and the diesel engine fire pump should be manually started to run once a month;

Fire pump maintenance

1. Maintenance requirements

Check the pump room, heat dissipation and ventilation facilities, and shutters to ensure that the pump room has good heat dissipation conditions.

Check the fire pump system to ensure that all components of the pump are normal.

Check the opening status of each valve to ensure that all valves are in normal working condition.

Make sure that the water inlet and outlet pipes can work normally. Make sure that the power part is firmly connected to the water pump.

Make sure that all components of the controller can work normally.

Make sure the diesel engine system and components can work normally.

2. Maintenance content

Check the pump room, heat dissipation and ventilation facilities, and shutters every week to ensure that the pump room has good heat dissipation conditions. The common electric pump room is not lower than 4°C, and the diesel fire pump room is not lower than 2l°C.

Check the fire pump system every week to ensure that the pump set is in good condition.

Check the electrical control part every day, and require the control part to be in good condition.

Check the sealing condition of the pump group every day, and the horizontally installed fire pump will not drip more than one drop of water per second before it is put into operation.

When running the water pump every week, check whether the sealing ring of the water pump is firm and whether the water pump body is overheated.

When running the water pump every week, observe whether the flow rate of the water pump flow meter is 150% of the rated flow rate.

Do you know the reason why the water supply of diesel engine fire pump is reduced?
The diesel engine fire pump has good performance in fire water supply and long-distance water delivery. The water pump is driven by a diesel engine and driven by an elastic coupling. and flow options are wide.

However, during the use of diesel engine fire pumps, there may also be problems such as reduced water supply. In order to facilitate everyone to deal with the problem of reduced water volume, the following Xizhiquan relies on 18 years of experience in the production and sales of fire pump valves. The reasons for the decrease in pump water supply have been sorted out.

1. After long-term use, the inner wall of the fire pump pipe and the water surface of the impeller of the fire pump will become rougher and uneven after continuous washing with running water, which will increase the frictional resistance coefficient of the flow channel in the pump body. , coupled with the high flow velocity of water in the pump, the head loss will increase, and the hydraulic efficiency will be greatly reduced.

2. Due to factors such as the quality of the water body, there may be serious scaling or corrosion in the pump body. Serious fouling in the pump body of a diesel engine fire pump may increase the wall thickness of the pump body, reduce the capacity of the pump body, and reduce the water pumping capacity. In addition, the rough flow path increases the loss of water head, and the working efficiency and hydraulic efficiency of the fire pump are greatly improved. reduce.

3. There is also the unavoidable cavitation on the surface of the pump impeller. Because the pump has been used for a long time, the blades of the diesel engine water pump form a high and low pressure zone when they operate against the water surface, forming vaporized water bubbles that burst and impact the equipment, resulting in capacity loss and mechanical equipment loss. The wear and tear of mechanical equipment causes leakage and resistance to increase, which greatly reduces the capacity work efficiency and mechanical efficiency.

4. In the end, casting defects, abrasion, corrosion and chemical corrosion caused by the pump processing technology may cause cavities or cracks to form in the pump passage, and vortices are formed when the water flows, resulting in energy loss and greatly reducing the hydraulic efficiency.
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The above are the reasons for the reduction of the water supply of the diesel engine water pump. We can only deal with it better if we know the cause of the water drop. In fact, the performance and quality of diesel engine fire pumps are very stable equipment. Long-term use requires regular maintenance to ensure continuous performance. Zjbetter after-sales service is in place to help customers solve various operation and operation problems and solve customers' worries.