Replacing the pump in the well: how to get the old and put a new pump

In a country house or cottage can not do without an autonomous water supply system. As a source of water for it often choose the well. This system is very efficient, reliable and durable.

With proper maintenance and operation it requires almost no human intervention, but sometimes require the replacement of the pump in the well. How to do it correctly?

We'll show you how to get out of the wellbore an old pump and put in his place a new unit. In the present article we describe in detail the methods and process of the subtleties. Given our tips all work will be done perfectly.

The reasons for the replacement of the pump

Mechanisms do not last forever and sooner or later they will fail. It is clear that you need to replace a broken pump, served in front of this more than a dozen years.

However, if a hardware failure occurs prematurely, you should definitely find a reason. Otherwise, a new device may repeat the fate of his predecessor, threatening the owner of undue cost.

It is possible to "write off" occurred at the factory marriage. This, of course, happens, but rarely. Most often, the reason for failure lies elsewhere, namely in the mistakes made in the process of completion of wells. Consider the most common.

Errors in the choice of the well model

If the parameters of the equipment does not correspond to the actual production rate, there will be problems. When exceeding pump capacity water level will often fall below the suction nozzle. In models with protection from "dry run" work equipment, the equipment is turned off. Other pumps continue to operate.

In operation without water, which is a device for lubricating and cooling liquid, quickly wear out the bearings, the impeller and the motor overheats.

The same problems arise in the case of dry-running sensor improper installation. The result - failure and replacement of equipment. Another common mistake - the wrong choice of the pressure pump.

The reason is simple: too powerful pump will be switched off too often, which will inevitably lead to premature wear of the stator windings, impellers and even the engine to overheat.

I must admit that this process will go not so fast, but the resource pump in any case be substantially reduced. That is why the selection of the pump is necessary to consider the relationship between water consumption and performance.

If the equipment will raise the water to greater than indicated in his passport, the height, the pump will operate substantially continuously. Excessive load quickly displays the node failure.

Some owners pick up the pump on the principle of "more is better". They are trying to choose a model with excess capacity. This, too, will lead to rapid damage to the equipment.

Typical errors during installation

The equipment will inevitably fail if not properly determining the height of his suspension. Omitting the device is too low, it will suck pebbles or sand. If, on the other hand, raised high, the air can "grab".

The absence of a check valve adversely affects the pump. In this case, after each run, it must first be filled with water riser pipe, and then subjected to liquid slugging off. Thus, the greater the height to which the water rises, the greater the impact and, consequently, damage causing the pump.

And it is undesirable to excessively small diameter water supply pipe. life of the device at the same time remains the same, but the performance is significantly reduced. The lack of electrical protection, especially in areas with unstable voltage might damage the equipment.

When connecting electrical appliances is recommended to install stabilizing device for a complex and expensive electrical equipment - special control and protection stations. The cross section of the supply cable must be sufficient, otherwise the life of the engine significantly reduced.

Improper installation of automation and instrumentation - is another problem, leading to the accident. The minimum set of devices to complete water supply system with a storage tank and the pump is as follows: Dry-running sensor if it is not included in the packaging arrangement of the pump, relays, manometer, automatic to disable / enable.

Correctness of installation of the pump also affects the battery life. A check valve should be mounted between the flow pipe and the pump.

In this case the pipe diameter must exactly match the dimensions of the thread on the equipment. During the descent of the pump electric cable and wire rope necessarily secured to a water pipe.

This should be done with the help of lay, rather than, for example, electrical tape. The only way to get a mobile connection that when a thermal deformation allows the cable to move.

Violation of rules of operation

In the operation of the equipment it is very important to follow the correct settings pressure switchSet for automatic system control. They must be correctly exposed even when mounting and continuously monitored, because in the course of the work, they can get off the equipment.

Can not be neglected and periodic maintenance of the system. Regularly check the value of the pressure in the accumulator Pneumoelements. It must exactly match those specified in the passport.

On average, pump up the pneumatic components have to once a month. If you do it less often or not at all, the pressure change and the pump will be deactivated / activated more often than necessary. The consequence of this would be premature wear member and pump failure.

How to get the pump out of the well?

Despite its apparent simplicity, it is complex and demanding procedure. And its complexity will largely depend on how deep and fixed equipment. Experts share the three difficulty levels of such works.

It should be understood that what matters is not so much the depth of the water wellAs the water level in the casing, that is, the dynamic and static level. For example, in the well with a 120 m depth static level can be at around 10 m. Then the pump is set at a depth of 20 m, which will greatly facilitate its lifting.

The most simple embodiment can be considered dismantling equipment located at a depth of 30 m. The design of the pump and tubes in this case has a relatively short length and weight, allowing to extract it to the surface forces 1-2 person.

Pumps installed at a depth of between 30 and 100 m, raise the top is much harder. The length of the structure pipe and the pump is much greater its weight also increases. Moreover, the lower pump is lowered, so it is more powerful and correspondingly heavier.

We can not forget about the mass of water filling the pipe. Thus, the weight of the system obtained significant. Alone raise the pump will not work. We need the help of several people and special devices: a winch or crane.

Equipment immersed into the well for more than 100 meters, often falls on galvanized or stainless steel pipes. The variant with pipes and IPA with a pressure of 16 atm.

For such designs using enhanced headroom and safety cable with a larger cross-section. Thus, their weight is very large. For dismantling necessarily used crane or a special winch.

pump lift procedure is quite simple. Starting with a power failure, is fed to the equipment. Thereafter unscrew the junction water pipe. Now you can begin to rise.

Slowly and carefully pull the pump to the surface, protecting it with this rope. To avoid problems, pull gently but continuously.

What if the pump stuck?

The biggest trouble of all that can happen at the pump rise, is it getting stuck or falling into the well. In severe cases, this can result in the need to drill a new well as use the old because of a jammed pump in it will not be possible.

However, the pump always have to try to remove it. Let's talk about how to do it right.

Often, when the pump is formed sag lifting cable forming a loop. It can perehlestnutsya around the unit and jammed between it and the wall of the borehole. In this case, it is unlikely that will help. The situation can only be prevented.

To do this, follow closely the rising construction and do not allow the emergence of slack in the cable. Furthermore, it must be fastened to the pipe.

It is important that the cable and pipe and cable exits to the surface at the same time, without any appreciable slack. If it is still there and pump a little prizaklinilo, take the tube and are pushing slightly down equipment. Then select the slack and slowly continue to rise. If the pump does not go down, you should leave it in the position in which it is stuck, and call specialists.

It may happen: Pump out quickly and without any problems. Suddenly he stopped moving upwards, though ran into an obstacle. Rather, equipment stumbled on ledge inside the casing. This may be the remains of welding or butt-print.

In this case, hitting the edge of the ledge will clearly be felt down the pump will go down easily. There's also a dent in the wall. Here, the impact will not be felt, and the device will descend with difficulty.

To remove the pump can advise such a method. Gently rotate the device for the hose around its axis, slowly pull it up. If you are lucky, the device will slide around obstacles will round it up and pass the problem areas.

As well it might accidentally fall over an object, such as a screwdriver or wrench. The gap between the pump and the borehole wall is so small that a foreign body which has got into it, immediately stuck equipment.

In this case, the pump will be easy to fall down and not be able to move up. It is necessary to pick up the slack rope, pull it slightly and securely fix the jammed pump.

Further work should be carried out only with special equipment. The wellbore is rarely used on sand may occur silting pipe above the pump. To manually remove it, you should use the buildup method.

To do this uniformly weaken, and then stretch the wire on which the device is fixed. We need at least a little to tear the pump from the bottom, in this case, the resulting backlash hit the water. It will thin the mud when lowering / lift equipment and it is likely to be able to remove the surface. It is important to do everything carefully, without any extra effort can break the wire.

If all else fails and the pump remains in the hole, you need to call the professionals. They must have devices for Video diagnostics to help identify the cause of the seizure, and special tools.

The same should be done in the fall and the pump in the well. Remove it only by means of special equipment. In the most hopeless case, you can try to destroy the device stuck drilling machine. However, it is expensive and quite risky.

Proven methods extracting from the wellbore pump in the case of jamming it in the trunk listed in the following article, we encourage you to read.

What to choose: repair or replace?

You have to understand that is not always the cause of problems with the filling of the accumulator or storage tank is in the pump. It is possible that lost control of automation or she is out of order.

A leak could appear in the water supply pipe or a silted well. Therefore, raising the pump only after we eliminate damage accumulator and automation.

After removing the equipment from the well worth checking out his performance dipped in a container with water. Thus be able to see if and how the motor is supplied with water running.

It is clear that adequate diagnosis can spend only experts, but will be able to understand whether it is needed at all. In addition, the low hanging vibration pumps are often clogged with sand.

To return the unit to life is enough to disassemble the cabinet and shake out from it under the clogged valve rubber pebbles. In the case of wear and may have to replace the valve itself, but it is very simple and cheap.

After pump diagnosis can make a decision on its reconstruction or replacement. It is clear that if the mechanism had served 10 years or 15, wear of parts is large, and it only needs to be changed.

When choosing a new mechanism should take into account all the nuances. To prevent the error described above, which lead to a rapid breakdown devices need adequate pick up the pump. Its specifications must exactly match the capabilities of the source and residential building needs.

Installation of a new pump

Before the descent of the new pump into the well should insure themselves against possible problems related to its future recovery. First of all, you need to know that the larger the size of the gap between the pump and the wall of the casing, the lower the probability of jamming equipment in the well.

Well-known manufacturers offer special models of the minimum thickness. It is clear that the cost of their higher. However, the price difference is not comparable to the cost of repair work, with the possible jamming or even drilling a new well.

Also, do not try to save on the cable, which will suspend the pump. Strongly not be used in that capacity of simple steel wires, galvanized or plastic shell. Not suitable as a chain or rope.

It is necessary to buy the right amount of high-quality stainless steel cable and a set of bindings for it. This will eliminate unnecessary repair costs in the future. Experts insist that the use of the well spliced ​​cables and hoses - a big risk.

There is no guarantee that the subsequent rise of the pump they did not disperse, the scrap is not screwed on to the side of the well and do not jam the equipment. Thus, the smaller joints, and ideally they are not present at all, the better.

And one more thing. installation tip on the well is required, otherwise it will inevitably fall into the small and large debris, which is extremely undesirable.

After the necessary materials and equipment purchased, you can start working. Necessary actions should be taken in this sequence.

Examination of the status of the casing

Before launching the pump is required to check to see if there were on the walls of the casing bends, irregularities or narrowing. Such defects can seriously hamper the installation of equipment and affect the service life. With a small gap lower the pump into the well will be difficult, with the operation of the same problems occur.

A large gap is also undesirable. In this case, the pump will not be able to provide the desired speed of movement of water, cooling its engine. Therefore, we must be adhered to the minimum permissible value, which indicates the manufacturer of the equipment documentation.

Prepare the pump for descent

We take the equipment and fasten it to the wire. If there are concerns that the cable of the pump can break attachment to the body, using a suspension of a strong nylon cord.

Choose the one that is able to withstand a tensile load of at least five times its weight. If the depth of the well is large, it is possible to duplicate a safety suspension element.

Knot tying at the overhead cable so as to be at least 10 cm away from the pump inlet. Otherwise, it will suck the equipment. The tips of the cord cut and necessarily melted.

In the apparatus which will be omitted to a depth less than 10 m, it is necessary additionally to fix a spring suspension, which will damp the vibration. For these purposes the tape of a flexible rubber or usual medical tourniquet.

Electric cable, plastic tube and a suspension fixed to each other twist. Step between fixings must not be less than 80-130 cm. In this case, the first bunch of doing at a distance of 20-30 cm from the pump nozzle.

connection submersible pump to correctly perform well without the use of a threaded joint, which is subjected to corrosion and degradation reduces the strength of pipes. Will perform optimally flanged connections. They are more reliable and are longer.

When the bolt is required to insert the top and bottom of the nut. This is done in order to subsequently screw under no circumstances did not fall into the well. Because it can cause a serious accident.

Reassembling the pump set into the barrel

Finishing preparations. The upper part of the injection duct to attach the base plate. If the pump is not equipped with a check valve, install it here. Then put the valve, pressure gauge and the knee, and then connect the equipment to the system.

Then gathered from cord tube and cable suspension lift and fixed to a predetermined bar. Getting pump descent. Operations are conducted very carefully. The equipment must not touch the casing wall.

If it is clear that this can not be avoided, it is better to err protect the body by a rubber ring. Omit the pump to the desired depth. It should be well below the dynamic level approximately two meters. It should be remembered that the bottom should stay at least a meter.

Minimum mark, which can lower the pump - 0.3 m below the dynamic level. Such depth will be enough to drive instrument cooled properly. For optimum operation of the pump is considered depth of 2-3 meters from the dynamic level.

For measuring the water level in the well bore to set the bearing plate column gas pipes. Omit its lower dynamic level.

After we dropped the pump to the desired depth, firmly anchoring the suspension. Then take a Megger and conduct measurements to determine the insulation resistance in the motor winding when the cable is lowered. And connect the management station to the pump, check again, he omitted to whether sufficient depth. Next, do a trial run of the new pump.

Assess the operation of the device, we pay special attention to how properly functioning motor under load. If found some shortcomings, immediately eliminate them and once again check the operation of the equipment. Set wellhead tip top cover and tighten the screws, securely closing the device. Now, the construction will not be able to get any debris or surface water.

For information on how service can generate water intake, detail written here. Since the rules of operation should be read to avoid situations requiring extraction pump and too frequent cleaning of the barrel.

Conclusions and useful videos on the topic

Video # 1. How to prepare the pump for lowering into the well:

Video # 2. Replacing a pump in the well:

Video # 3. How to install the pump in a deep hole:

Replacing a downhole pump - a rather difficult and critical operation. It is important to get out of the barrel of end of life equipment so that it does not get stuck or do not fall down. Otherwise it will be impossible to exploit the well.

The new pump should be lowered and installed in strict accordance with the manufacturer's recommendations. Only then the equipment will be a long and trouble-free.

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