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.

Causes of Fire Pump Vibration and How to Maintain Multistage Pumps
There are many reasons for the vibration of the unit and the building of the pump room, and some factors are related and interacted with each other. In summary, there are mainly the following four reasons.

1. Electrical aspects The motor is the main equipment of the unit. The unbalanced magnetic force inside the motor and the imbalance of other electrical systems often cause vibration and noise. For example, during the operation of an asynchronous motor, the radial alternating magnetic pull between the stator and rotor is generated by the interaction of the harmonic flux of the stator and rotor teeth, or during the operation of a large synchronous motor, the magnetic center of the stator and rotor is inconsistent or the air gap in each direction is different Exceeding the allowable deviation value, etc., may cause periodic vibration and noise of the motor.

2. In terms of machinery, the quality of the rotating parts of the motor and water pump is unbalanced, shoddy, poor installation quality, the axis of the unit is asymmetrical, the swing exceeds the allowable value, the mechanical strength and rigidity of the parts are poor, the bearings and sealing parts are worn and damaged, and the water pump is critical. The resonance caused by the rotating speed and the natural frequency of the unit will produce strong vibration and noise.

3. In terms of hydraulics, the flow rate and pressure distribution of the pump inlet is not uniform, the pressure pulsation of the working liquid at the pump inlet and outlet, liquid circumvention, bias flow and shedding, non-rated working conditions and pump cavitation caused by various reasons are common. Causes of pump unit vibration. Rapid changes in pressure in the water pipeline and water hammer caused by dynamic transition processes such as pump start and stop, valve opening and closing, working condition changes, and accident emergency shutdown often cause vibrations in the pump room and unit.

4. In terms of hydraulics and other aspects, unreasonable design of the water inlet channel of the unit or not matching the unit, improper submersion depth of the water pump, and unreasonable start-up and shutdown sequence of the unit, etc., will deteriorate the water inlet condition, generate vortex, induce cavitation or aggravate Vibration of unit and pump room. When the unit using destructive siphon vacuum cut-off is started, if it is difficult to entrain the air in the hump section, the siphon time will be too long; the flap door design of the unit with flap valve cut-off is unreasonable, and it opens and closes constantly, constantly hitting the flap seat; support The uneven subsidence of the foundation of the water pump and the motor or the poor rigidity of the foundation will also cause the unit to vibrate

The daily maintenance of the fire pump is very important. It is necessary to take care of it frequently. It will shorten the service life of the pump. So, if you are interested, you can take a look at

10 aspects that need to be paid attention to in water pump maintenance:

1. Regularly check whether there is no shortage of oil at the refueling point of the motor and the pump body, and whether the sound of the bearing running during the operation of the pump is normal

2. Is the concentricity of the electricity coupler and the pump coupler consistent?

3. Whether there is water leakage or air leakage in the suction pipe of the water pump

4. Whether the balance pipe is blocked. 5. Whether the outlet pressure of the water pump is normal

6. Whether the water pump vibrates too much during operation

7. Is the bearing seat of the water pump overheated?

8. Is the manual cranking flexible?

9. Is the installation foundation of the water pump firm?

10. The water pump uses packing seals, which need to be fastened or replaced frequently

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.

Fire pump diversion time and how to polish the fire pump
As an important tool for fire fighting and disaster relief and saving lives and properties, fire pumps have a fast response speed, especially the water diversion time must be very short, so as to reduce losses. How is the water diversion time estimated?
1. The estimation formula affecting the water diversion time of the fire pump is derived according to the standard atmospheric pressure. When the test air pressure is not a standard atmospheric pressure, the estimation formula should be corrected.
2. Since the height is relatively small, and the fire pump also has the exhaust function at this time, the time for this process is very short and has little effect on the overall calculation results. The results of the water diversion time test of the fire pump show that the calculated results using the estimation formula are basically consistent with the measured data, and the error is small.
The fire pump is a prop used for disaster relief and fire extinguishing. The water diversion time is short. After the calculation, the next step will be to pay attention to the calculation to reduce losses and will be more used in various industries.
3. Many factories will be equipped with some fire-fighting tools such as fire pumps. In case of accidental fire, it becomes a tool needed for fire fighting, so many manufacturers will choose it, and its appearance affects the user's choice of it, so after production , you can choose the following polishing methods:
4. Flame polishing: use flame to soften and bake the surface of the fire pump, and fire impact can remove some diagonal lines and wrinkled skin on the surface. Many mouths will be flame polished after cutting the mouth, but this treatment method will reduce the surface of the pump. flatness.
5. Polishing with polishing powder: This method is to rub the surface of the fire pump at high speed to remove scratches. Before polishing, the polishing part must be polished with an abrasive belt. This method uses many materials, and the best effect is cerium oxide, but this The process speed is relatively slow.
6. Acid treatment and polishing: Use acid to corrode the surface of the fire pump for surface treatment. Before polishing, it is also necessary to use abrasive belts to polish, because acid polishing will reduce the thickness of the equipment itself a lot, and it may not be able to completely remove the surface texture.
Polishing is a way to renew the appearance of the fire pump. In order to make the product have a bright appearance and attract customers to buy, many manufacturers will polish the product according to the characteristics of the product to remove the traces of the appearance.

How can the use of diesel engine fire pumps be more energy efficient?

Here are several methods for your reference:

1. Optimize the pipeline structure of the pump body: reduce elbows, shorten the pipeline, and the pipeline with the same diameter is 1 meter shorter, which can save about 0.5 catties of diesel oil in ten hours; expand the diameter of the outlet pipe, if the 4-meter-long 10cm outlet pipe is replaced by 15 Centimeter tube, ten hours can save 1 catties of diesel.

2. Keep the diesel oil in the equipment clean: After the fuel tank has been used for a long time, there will be some impurities and sediments at the bottom of the tank, which will affect the normal work of the plunger and the fuel injector. It should be cleaned or purified regularly. Otherwise, it is easy to cause inaccurate fuel supply timing, uneven fuel supply, poor atomization of fuel, etc., resulting in increased fuel consumption and reduced power.

3. Remove carbon deposits in time: Diesel fuel will generate high temperature during combustion, making ash carbon polymers adhere to valves, valve seats, fuel injectors, piston tops, etc. If not cleaned in time, it will increase fuel consumption and seriously affect the normal operation of the engine. Work.

4. Maintain an appropriate cooling water temperature: the cooling water temperature of the diesel pump engine should be kept at 45-65°C. If the water temperature is too low, it will cause incomplete combustion of diesel oil and increase the load of the machine itself. Note that it is best to use "soft water" without minerals (such as distilled water and rainwater) for cooling water, and sewage and muddy water should not be abused.

5. Don't overload the operation: The overload operation of the diesel engine water pump in the form of a small horse-drawn cart will turn a considerable part of the diesel into black smoke, which will not play its due role, increase fuel consumption, and shorten the service life of related parts.

"Nurture is more important than treatment, prevention is more important than repair", diesel engine fire pumps should pay attention to maintenance and maintenance, regularly check and adjust the diesel engine water pump valve clearance, fuel injection pressure, fuel supply time, etc., and timely eliminate scale and dirt on the cooling water jacket. Vulnerable valves, fuel injectors and other components are repaired and replaced in a timely manner. Important parts are always in good condition, with high operating efficiency and the most fuel-efficient.