What can be cooked from squid: quick and tasty

The variety of designs and conditions of use of pumps determines the variety possible malfunctions... The instruction manual for each pump contains a detailed list of common faults and remedies.

Here is short review typical malfunctions of pumping equipment.

The main signs of malfunctions that appear during operation: vibration of the unit, elevated level noise and a change in its tone, increased operating currents, pressure pulsations.

The reasons for pump failure can be divided into several groups.

1. Mechanical faults:

1.1. defects in manufacturing, assembly and installation of the pump unit;

1.2. caused by wear of the pump unit.

2. Malfunctions of the control system:

2.1. work in unacceptable modes (outside the working area);

2.2. malfunctions of the power supply system;

2.3. malfunction of the electric motor.

3. Faults in the hydraulic system:

3.1. incorrect selection of the pump;

3.2. changing network parameters.

4.1. Mechanical faults

Manufacturing or assembly defects are identified during pre-run and test run. Some of the factory defects appear only after some time of operation.

During operation, wear occurs on bearings, impellers or rotors, seals, rubber parts of couplings. In chemical pumps, in addition, corrosion of the flow path.

Bearing wear will result in increased vibration of the machine. Long-term operation on worn bearings may cause the rotor to skew. The consequences are an increase in power consumption, increased heating of bearings and a rack, grazing on the impeller housing, skewing and grazing on the stuffing box seal housing.

The wear of the impellers leads to a drop in the flow rate and the head at a practically unchanged power consumption. With severe wear of the wheel and wear seal at the inlet, the balance is disturbed: an unbalanced axial force occurs. The consequences are the load on the bearings and their wear, displacement of the impeller in the pump cavity, its friction against the casing (suction pipe) and wear of the impeller and casing.

The wear of mechanical seals is especially dangerous for submersible pumps (GNOM, NPK, CMK ...), since water enters the cavity of the electric motor and causes damage to the winding.

The main malfunctions and their causes are shown in the table:

4.2. Work in unacceptable modes

Dry operation (without filling the pump cavity with liquid) is unacceptable for all pumps.

This is especially dangerous for submersible pumps (ETsV, GNOM, NPK, etc.), because the cooling of the engine is disturbed and then the insulation is destroyed. Dry running results in overheating and seal failure. In the stuffing box packing, the packing is abraded and then the protective sleeve is damaged. The rings in the mechanical seal are destroyed. In a number of pumps (ETsV, UPS, KhTsM), sleeve bearings are destroyed, which under normal conditions are lubricated and cooled by the pumped liquid.

For protection against "dry" operation, it is necessary to install a dry-running sensor or an inlet pressure sensor, installation of overcurrent protection (against operation with a current lower than the rated one).

In some cases, with the likelihood of "dry" operation, it is possible to use centrifugal pumps with double seals (with a barrier liquid supply).

For dynamic pumps, an unacceptable mode is also going beyond the working area (flow is less than Q min or more than Q max), because. this increases the likelihood of cavitation. Working with a flow higher than the maximum one also leads to an overload of the electric motor.

4.3. Power supply system malfunctions

Two groups of faults are distinguished here: deviations of the network parameters from the nominal ones and faults associated with connecting wires.

With a reduced voltage in the network, the electric motor does not develop the rated power, and when the pump is started, a breakdown of the parameters is possible. Oscillations and surges in voltage, phase imbalance (voltage inequality in different phases) lead to fluctuations in rotation speed, increased vibrations of the electric motor and, in the worst case, to a breakdown of the winding insulation.

The main faults associated with the connecting wires are incorrect selection of the cable (increased resistance), phase failure, incorrect phase sequence (motor reverse).

With an increased resistance of the cable, a picture can be observed, as with a reduced supply voltage. As a rule, the cable becomes very hot during this process, which can lead to damage to the insulation and a short circuit.

In the event of a phase failure, the motor continues to work, but at the same time the currents of the electric motor windings increase sharply. If in this case the protection does not work, the result is overheating and destruction of the insulation of the windings.

The direction of rotation of a three-phase electric motor is determined by the phase sequence. With the opposite direction of rotation, a significant decrease in the parameters of centrifugal pumps and strong heating are observed. In vortex pumps (VKS, SVN), gear pumps, the direction of fluid flow changes - from the discharge pipe to the suction pipe.

For stationary pumps, the direction of rotation of the electric motor is determined during installation and can only be changed when working on the mains. The direction of rotation of portable pumps (GNOM, NPK. ANS….) Must be checked at each connection.

Any malfunction of the water supply system at home is the result of a mistake by an organization or a private person who was involved in its implementation. In this case, the landlord has good chance learn from your mistakes, repairing the electric pump with your own hands and, with a "successful" coincidence, strengthen your health by transferring water manually from the nearest water source for some time.

Rice. 1 Borehole pump assembled

This sequence of actions applies to all types of pumping equipment, regardless of the place and method of installation. It should be noted that the pump's power supply system, in addition to the wires switched by switches, does not have complex circuits, therefore, if the submersible water pump does not pump water, but starts up and hums, problems with the supply of the required supply voltage in the vast majority of cases can be excluded.

If the drainage pump or downhole model does not pump water, it may not start if the built-in or external condenser is faulty and repair with its replacement will be required.

First of all, the repair of electric pumps should begin with disconnecting the supply voltage, removing it from the water intake source and disconnecting the outlet hose.

When reconnecting, the reasons why the pump does not work can be broken down at the place of manifestation into several sections - we will consider them below.

Rice. 2 Water supply scheme of a private house

Usually, a properly assembled water supply system and quality pumps have devices that prevent them from idling.

In the event of a malfunction of such protective devices: a dry-running relay of a borehole and float switches for drainage, a well or fecal pump, the devices can work in the absence of water.

Sometimes the float switch of well or drainage pumps, due to improper installation, does not go down along with a drop in the water level (falls on a bump or clings to a protruding object) - this leads to the operation of the electric pump in idle mode and its further failure.

Rice. 3 The popular Jilex pump with a float switch

Vibration pumps, usually without external protective devices in the system, working for a long time without water after a drop in its level, may fail in the absence of built-in thermal protection.

Depressurization or breakage of the water main

The malfunction will help to identify the removal of the submersible pump from the water intake source and the connection to the supply voltage at the surface. If a pump lowered into the water for testing pumps water with the required pressure, then you should look for a leak at the point where the hose is connected to the outlet pipe or in pipes that are laid underground with regular water supply to the house (in a house, a leak can be easily noticed by the presence of water on the floor in a room with pumping equipment).

Inconsistency between the parameters of the pump and the source of water intake

In a dry season or with a sharp increase in water consumption, a situation may occur when the well or well does not have time to fill (the flow rate of the source is too low for the normal operation of pumping equipment). In this case, the electric pump will operate in dry running mode for some time in the absence of a similar relay or float switch in the system.

A very common reason for the lack of water when the pump is running. Such malfunctions can occur at the stage of installation of pumping equipment: dirt and foreign objects can penetrate into the pipes. During operation, meshes and replaceable filter cartridges become clogged.

Fig. 4 Disassembled clogged electric pump

The filters and impeller of the impeller of submersible devices need regular cleaning during operation - if this does not happen, over time they become clogged and the operating pump hums, but does not pump water or does it with a low pressure.

Often a situation occurs when the actuator of the pumps, when clogged, completely stops - the impeller does not rotate, the piston of the vibration pump does not move. A clogged borehole or drainage pump removed from the water intake tank does not pump water when turned on superficially - do-it-yourself repairs will require disassembly and further cleaning of the device mechanism.

The biggest nuisance that can happen to an electric pump is a burnout of the winding, while the device is usually not repaired (rewinding the winding with your own hands is difficult, and in a workshop, the cost of work and materials will not be comparable to the price of an electric pump).

With this malfunction, the electric pump will hum, but it will not be able to pump water.

Fig. 5 Vibration pumps under repair

Sometimes the impeller of borehole and well pumps can break down, the check valve system (they will not allow water to pass through) and the piston ring of vibration models fail.

Due to constant vibrations during operation, vibration pumps are susceptible to loosening and untwisting of the mounting mechanism of the composite body, fixing the check valve and piston nuts. These factors can lead to the loss of performance of a serviceable electric pump, which will hum, but not pump water.

Violation of the rules for the operation of submersible pumps, errors in the installation of the water supply system, a sharp increase in water intake and a decrease in the flow rate of a well or well can lead to the hum of a working electric pump, in which water will not flow to the consumer. In most cases, you can repair electric pumps with your own hands if you remove the device to the surface to accurately determine the problem area.

Good business executive suburban area or the owner of a private house at least one faced the problem of pumping water. Such a nuisance could occur as a result of the flooding of the basement after heavy rains or melting snow, the need to pump out water from a pool in a country house or a private house, a well or a sewage sump.

For these purposes, you will need a drain pump. Responsible owners of such equipment try to monitor the technical condition and repair the drain pump on time in order to avoid damage to the pump unit at the wrong time and so that it can turn on as it should.

1 Drain pump: purpose

Drainage means a pump that is designed to pump out (drain) any liquid or to ensure that the sewage system works in normal mode. A drainage pump is often confused with a fecal pump. This happens out of ignorance. Indeed, with the same principle of operation and purpose, they are similar, but the liquids they pump are different.

The use of a fecal pump is possible for pumping out liquids with impurities up to 8 mm in diameter. To prevent excess impurities from entering the inside of the working chamber, a grinder is installed. The ability to crush and remove 98% of debris allows for extremely rare unit repairs.

Drainage pump does not have a chopper in its layout. For protective purposes, it is equipped with a mesh filter, which collects larger particles of impurities up to 10 mm in size. The operation of the drainage pump is carried out by supplying liquid with the help of an impeller, as well as other elements of the system. After that, the liquid that was pumped by the pump from a container or water source enters the hose. The vacant space inside the housing is occupied by new fluid, which comes from the inlet hole.

1.1 Major breakdowns and malfunctions of drainage pumps

Consider the main problems associated with the repair of the drainage pump and which are most common:

• the pump hums, but at the same time it does not pump water;
• when the unit is turned on, knocks out circuit breaker networks or traffic jams fly out;
• severe vibration or overheating;
• low fluid pressure at the outlet;
• breakdown of a pressure switch or hydraulic accumulator;
• defrosting the unit.

1.2 The pump hums without creating fluid pressure

Often there is a problem when the drain pump does not pump, but it continues to hum. In this case, little or no fluid pressure may be created.

The most common reasons why the pump hums but does not pump water are:

• low level of the pumped-over liquid;
• turn-to-turn closure of the electric motor;
• mechanical breakdown;
• problems with the air valve.

The location of the drain pump in the aquatic environment is mandatory, as they are considered submersible pumping equipment. To prevent the use of the drainage unit without liquid (dry), additional protection in the form of a float switch is installed on it. Float switch is able to automatically turn off the unit if an insufficient level of the pumped liquid appears.

This shutdown is possible thanks to the ball, which is located inside the float. When the water level changes, it changes its location in the float and closes or opens contacts in the electrical circuit. Sometimes it happens that the engine is humming or running, but fluid is not being pumped. This is due to the cavitation mode. Cavitation occurs when the equipment has excessive power, and therefore water does not always have time to seep through the impeller blades. To solve this situation, the pump should be lowered deeper.

The lack of movement of the electric motor can be associated with an inter-turn circuit. This electrical breakdown can be detected if the engine is turned on and it starts to hum, while the power cable will warm up. Turn-to-turn closure mainly occurs in connection with the operation of equipment in a dry environment. After all, the engine is cooled by the pumped water. Without water, the engine idles and overheats, which causes a violation of the insulation of its winding.

A mechanical failure occurs when the engine is running. If it turns on, but does not spin and hums. This can happen if the impeller blades break. Broken parts can jam the rotating shaft. Or, if the shaft is seized, the bearing system may not function properly.

All this, with such a long-term work, will still lead to an inter-turn circuit, and then the drain pump will have to be repaired. In order to verify this breakdown, you will need to turn off the power and remove the equipment from the aquatic environment. After that, it is necessary to rotate the impeller on the shaft. If you cannot turn the impeller, then you will have to disassemble the device.

Some drainage pumps have special valves that release air. The ball in the valve often sticks. This happens when the device is operating in a difficult environment and water with impurities gets into the inside of the unit. The sticking of the ball interferes with the constant evacuation of the accumulated air and the engine starts to idle. To restore performance, it is sometimes enough to let the pump run in clean water. The valve opening is slightly cleaned of adhering dirt and plaque.

When the electric motor is turned on, the circuit breaker may turn off or the fuses on the plugs may blow and the cable supplying the pump may melt. This happens when the shaft is jammed in the bearings or when the electric motor burns out. If the electric motor burns out, a characteristic burning smell will be heard.

This could happen when the wrong connection of the device was made, the wrong power network was chosen - 380 V instead of 220 V. It is better not to disassemble the pump in this case, since it will still have to be taken to the drain pump for repair in a service workshop for further rewinding armature windings. To convince yourself of a fault in the windings, you can measure their insulation resistance.

The minimum insulation resistance for starting up the unit must be 0.2 MΩ.

As mentioned above, some models of drainers are equipped with thermal relays that turn off the device when it overheats. In its absence, you have to carefully monitor that the pump is not for a long time outside the pumped liquid in working order. With prolonged operation in a dry case, the device will overheat, which will entail the displacement of the magnet fixed with epoxy glue, which, in turn, the transfer piston can jam.

After detachment of the magnet, internal vibration may begin and a chain reaction about the pump will go, which ultimately disables all mechanics and electronics. As a result, the entire apparatus becomes a heap of scrap metal. Experts believe that in most cases, after such breakdowns, repair for the drainage pump will not be economically viable.

In case of timely detection of this defect, you should contact service center... There they will carry out the appropriate diagnostics of the equipment, replace the damaged parts and install the magnet itself in place. Self repair can lead to a series of incorrect actions that affect performance.

First, the device is completely disassembled and the magnet is taken out neatly. After that, apply longitudinal notches to the housing and magnet for better adhesion. Then a glass sealant or new epoxy adhesive is applied, the worn parts are replaced and the pump is reassembled in the reverse order.

Drainers, both surface and submersible, have a breakdown in the form of weak outlet pressure. There are several reasons for such a breakdown:

The filter is most often clogged. The pressure of the pumped liquid through the hose (hose) can drop sharply or stop altogether. The main symptoms of this are overheating of the motor or overloaded operation of the device and its loud noise. At surface stations, when worn out, the sleeve is damaged or the clamp is loosened, which tightens the fastening to the sleeve.

This contributes to the suction of unnecessary air into the pumping system and the ability to lift water from the source is lost. The solution to this problem is simple.- you will need to inspect all connections on pipes and clamping clamps.

It happens that everything seems to be in order. In this case, the vibrator may have a small stroke. To eliminate this malfunction, the device is disassembled and an additional vibrating rod washer is adjusted. Lining one washer doesn't always help. Several more of the same may be required, which is determined by the selection method. Seals and diaphragms must be kept intact and undamaged.

1.3 Repair of the drain pump (video)

2 Repair of drainage pumps

The above malfunctions for the drain pump cannot always be rectified by yourself. You can independently fix a weakened shock absorber, release or replace the float, eliminate mechanical damage that caused the impeller to jam, replace the supply cable.

The simplest of all this will be to secure the shock absorber. To do this, you need to disassemble the device body and tighten the loose nuts on the mounting bolts. It is imperative to lock the top nut so that there is no further loosening. It will take some time to replace the power cord. Replacement of the condenser is possible in some models of drains.

The rest of the faults are practically impossible to eliminate without the involvement of service workshops. For example, if the stock is torn, it is easier and sometimes cheaper to purchase new equipment than to disassemble and try to repair it. Replacing a valve is a difficult and unprofitable undertaking for independent decision Problems. Replacement of a burnt-out winding must be carried out in specialized workshops.

2.1 Most common causes of breakdowns

When it becomes necessary to repair pumping equipment, it is necessary to find out the probable cause of its breakdown, which are often:

1. Failure to comply with the terms of periodic inspection and repair of equipment.
2. The equipment was not operated correctly. During operation of the device, its operating parameters were exceeded.
3. The pumped liquid contains solid impurities larger than required.
4. Prolonged use of the pump in dry mode.
5. The equipment was installed incorrectly or poorly.
6. The hydraulic accumulator, relay is out of order, there is no filter.

When the first hints of a breakdown appear, you should immediately check the following components of the device:
The ideal distance between the solenoid coils and the piston should be set from 0.4 to 0.5 cm. If these distances are not observed, the coils will beat if the gap is too large and the motor will overheat if it is too small.

The piston must be free of mechanical damage and defects, its condition must be elastic. The valve covering the inlet openings must have a clearance between the body of 0.7 to 0.8 mm. The air must flow freely when blown in on the intake side. It often happens that poor operation of the pump is not associated with its breakdown. There may be power drops in the network.

Therefore, before starting the disassembly of the device, make sure that the mains voltage is correct, which should be 220-240 V. It should be noted that for long-term and reliable operation of the pumping equipment, it is necessary to carry out technical inspection and maintenance of the device in a timely manner and follow the rules of technical operation.

The drain pump is a unit that is used by residents country houses and summer cottages for pumping out waste and groundwater that flood basements, inspection pits in garages, trenches and living quarters. The compact drainage pump allows you to quickly dispose of large volumes of water from various artificial and natural reservoirs. Below we will consider the device of the unit, the features of its selection and self-repair.

Drainage pump device - device design

One of the main advantages of a sump pump is its simplicity in design. The unit for pumping water from a well consists of a body, an electric motor and a pumping unit. The last element is responsible for the uninterrupted supply and pumping of fluid. Blades or impeller are installed on the pump shaft. The shaft is fixed in the bearing assemblies of the device.

The motor device includes a rotor and a stator, and the design of the pumping unit includes a suction pipe and a discharge pipe. The automatic control unit consists of an overheating protection relay, a thermostat and a circuit breaker.

The blades of the device are made of a durable technical polymer that is resistant to corrosion and mechanical damage. Some modern models for dirty water equipped with steel blades, which are more reliable than polymer parts.

All pump parts are housed in a robust metal case. The body of the submersible drainage unit is made of of stainless steel, and the body of the surface unit is made of cast iron or composite alloys.

The principle of the drain pump

The drain pump works very simple principle... Immediately after connecting the unit to the mains, the engine starts, which drives the shaft with blades. Water under high pressure gets inside the device through the suction pipe, after which the blades act on it. The latter push the liquid through the pumping unit into the discharge pipe. From there, the water is pushed into the outlet pipe.

For more effective work pump, the water must contain a minimum of solid particles. It is possible to use the unit for sewerage in a private house only if the diameter of the fractions in the composition of the water does not exceed 1.2 cm.

The immersion depth of the drainage device is also of great importance. In practice, the shallower the depth, the better, because in extreme cases it will be easier to pull the equipment out and fix the problem in a timely manner.

Drainage and fecal units are quite similar to each other, both in design and in principle of operation. However, there are a number of differences between the two.

The main difference between a drainage pump and a fecal pump is the size of particles that can get inside the device. Most drainage devices are designed for clean water with fractions that should not exceed 1.2 cm in size.

The faecal aggregates can be used for contaminated water containing solids larger than 10 cm in diameter. A more powerful industrial faecal pump is capable of absorbing particles larger than 12 cm in diameter.

The second difference lies in the sources for which both types of equipment can be used. Drainage units are intended for the basement, for the barrel and other tanks in which more or less pure water accumulates. Often, such units are used for a swimming pool located on the street. Fecal devices are used only for cleaning cesspools with a large amount of sand, lime and debris.

Drainage pump - how to choose the right unit?

When choosing a drainage pump for a summer cottage or a private house, you should adhere to certain criteria. Among the most important factors, it is necessary to highlight:

• Operating conditions of the device - when buying, you need to remember that the efficiency and duration of the drainage pump depends on the degree of water pollution. Dirt, lime and sand can quickly disable even the most powerful household appliances;
• Pressure, device generated- when calculating, you need to remember that one meter vertically is equal to 10 meters horizontally. If the depth of the basement or inspection pit is more than 5 meters, then the pump head according to the passport should be approximately 45-50 m;
• Dimensions and noise level during operation - a small pump will be best for pumping water from a small basement. The mini unit works quietly, is reliable, easy to connect and durable;
• Availability of protection against dry running - experts advise buying equipment with a built-in float. With the necessary automation, it is better to choose units equipped with a water flow switch and with a vertical switch;
• Pump drive - when buying a manual device, you should remember that pumping water with it will take a lot of time and effort. The best and easier to operate will be units with electric motors. With high performance, they consume a minimum of electricity, are easy to install, operate and maintain.

The listed factors will help determine suitable option for household and household use, and do not overpay for it.

The drainage pump hums, but does not pump water - identify and fix the malfunction

One of the most common sump pump problems is that the unit does not pump water, but continues to hum. Among the most common causes of this malfunction, it should be noted:

• Too much low level water in the source;
• Closing the motor in the area between the turns;
• Mechanical breakdown;
• Air valve breakage.

Each drainage pump is installed only under water - this required condition to operate this type of equipment. To protect the device from dry running, it is equipped with a built-in float that automatically turns off the device in the absence of the required amount of liquid.

This function is made possible by a ball located inside the float switch. As soon as there is less water, the ball changes position, opening the contacts in the electrical circuit of the device. Sometimes the pump does not work, but continues to hum due to the change in the cavitation mode. The latter is formed if the unit has a surplus of power, because of which the liquid does not always have time to seep through the blades on the impeller. In this case, the device must be lowered a couple of meters deeper.

Another reason for the breakdown is the turn-to-turn closure. This is easy to find out by starting the motor - if it starts to hum, and the pump cable warms up, then the reason lies precisely in the short circuit. This problem arises in connection with the operation of the unit on "dry running", since the motor is cooled precisely due to contact with the pumped-out water. If the motor overheats, then this causes a violation of the integrity of the insulation of its internal winding.

Mechanical damage can occur while the motor is running. For example, damage to the impeller blades causes the unit to hum but not to pump out water. To check the pump, you need to disconnect it from the power supply and remove it from the water source. Next, you need to try to scroll the impeller - if it does not rotate, then you will need to disassemble the unit.

Some drainage pumps are equipped with additional air release valves. A ball placed in the valve sometimes sticks if the pumping water is too dirty. Sticking this ball makes it difficult for air to escape, causing the engine to idle. To eliminate the malfunction, you need to lower the unit in clean water and let it work in such an environment for about half an hour.

Often, when the pump is started, the circuit breaker may turn off, which leads to the melting of the cable supplying the unit. This situation occurs due to a jammed shaft between the bearings or when the motor overheats. In this case, a pungent smell of burnt wiring will be felt.

Another reason for the breakdown lies in the clogged filter. As a result, the pressure of the fluid that enters the hose drops sharply. It is quite simple to identify this problem - in this case, the pump will hum and warm up a lot. To solve the problem with your own hands, you need to dismantle the filter, clean or replace it. You will also need to check all connections for leaks. If necessary, the joints will need to be treated with a special sealant and FUM tape.

As the sad statistics show, in 98% of cases the drainage pump fails due to the fault of the user. Factory defect, of course, also sometimes occurs, but extremely rarely. The fault of many is that the operating instructions are read, mainly when the pump is no longer working.

All kinds of complaints when contacting service companies and workshops can be roughly divided into 4 groups:

• all pumps are bad;
• we used it correctly, but it burned out;
• there was a circuit breaker (UPS, RCD, etc.), but it burned out;
• thermal protection is indicated in the document, but it burned out.

1. Oddly enough it sounds, but in the overwhelming majority of cases, the reason for the failure of the unit is work without water or liquid. Even if you have a high-quality Aquarius pump (it ranks first among domestic products), but the work is idle, the engine eventually overheats ,. Even with thermal protection of the motor against overheating, the winding burns out during repeated dry operation.

2. When buying a three-phase pump, you need to understand how to check the voltage of each phase and control the risk of breakage. If at least one phase is cut off, the motor winding burns out within a few seconds. The same can be said about incorrect connection, when initially some phase does not work. Moreover, there is practically no possibility to prevent combustion, the count really goes on in seconds.

3. The faecal pump often fails when large insoluble objects enter the sewage system. When disassembling the pump, you can find rags, laces, tights on the impellers, sometimes you even come across belts and things. Drainage pumps are designed to work with garbage of different fractions, but protection is simply not provided against such objects.

If missing check valve, this is also a guaranteed breakage of the working shaft. The fact is that when the water is drained, the wheel accelerates and turns in one direction, and when pumping out, in the other. If at the same time the unit releases water and receives a command to pump out, the shaft simply breaks out.

4. Violation of the working range often leads to breakdowns. The equipment must not be overloaded, but it is also forbidden to make it work half-heartedly. This is especially true for circulation pumps in the heating system.

5. Frequent switching on / off also significantly reduces the resources of the unit. In the absence of a frequency converter, the operation of such a pump will not exceed 12 months. Such problems are typical for private houses where a small accumulator is installed. To replenish the pump, you have to constantly turn on, work with an increased current, which leads to rapid wear. It is enough to put a hydroaccumulator 2-3 times larger for this problem to be solved.

And finally, let's note the main problem - pulling submersible pump for the power cable (some even manage to pull the float). In this case, the tightness of the cable connection is broken, which leads to a breakdown. For the convenience of pulling the unit to the surface, you must initially tie a rope to it.