deep well pump 120

When you see the request “deep pump for well 120”, the first thing that comes to mind is that a person is looking for a unit for a specific depth. But here’s the catch: this same ?120? - this is not only the static level or depth to the water surface. This is a set of parameters: dynamic level, well flow rate, casing diameter, required pressure for a home or irrigation. A common mistake is to select a pump based only on its immersion depth, and then wonder why there is not enough pressure in the system or why it is working at its limit. In fact, for 120 meters you need to look at pumps marked, say, 150-200 meters - you always need a reserve. And here the question of type arises: regular submersible or multi-stage centrifugal? For such depths, as a rule, you need exactlymultistage centrifugal pump— it provides the necessary pressure due to several impellers.

Why ?well 120? is a challenge for the equipment

Worked with dozens of such objects. The main difficulty is pressure. At 120 meters, the water column creates a pressure of about 12 bar even before the pump starts pumping. The unit must overcome this, plus raise the water to a height to the point of analysis, plus provide operating pressure in the system. Therefore, the nameplate pressure of the pump should be, conditionally, 150-180 meters. Less - it will work for wear, more - irrational overpayment. The material is also important. For drinking water - stainless steel, for technical water, perhaps cast iron, but in salty or aggressive environments - special alloys. At our production site inZhejiang Yangzijiang Pumping Industry Co.,LtdFor such tasks there is a series of multi-stage submersible pumps made of stainless steel - they are designed for a range of 100-200 meters.

Another nuance that is often overlooked is the diameter. The standard casing pipe for this depth is 110-130 mm. This means that the outer diameter of the pump should be no more than 100-105 mm, otherwise it simply cannot be lowered. I had to deal with situations when they ordered a powerful unit, but it did not fit into the well. Now we always clarify this parameter first. By the way, on our websiteyangtzeriverpump.ruIn the technical characteristics of each model, this parameter is indicated separately - so that such incidents do not arise.

And of course, automation. For a depth of 120 meters, a simple float switch will not work. We need a full-fledged control system with a frequency converter and dry-running protection that monitors not only the level, but also the motor current. Without this, the pump, if the well flow rate is small, can pump out water and run “dry,” which is fatal for a deep-well pump. We always take this into account in our kits.

Experience and mistakes: what happens when you save on the wrong things

There was an incident at one of the facilities near Moscow. The well is just 120 meters long, the flow rate is good. The customer, having decided to save money, purchased a non-specialized pump at a cheaper price, although with characteristics that matched the numbers. He worked for two seasons. Then the interruptions began, and then it completely failed. Disassembly showed erosion of the impellers and shaft. The material could not withstand constant high pressure and possible small abrasive particles. I had to change it to normal. In terms of money, it turned out to be one and a half times more expensive than if the correct device had been installed right away. This example shows well that for deep wellsdeep well pump- this is not something you should skimp on. Reliability and the right materials come first here.

On the other hand, there is also reinsurance. They install a pump with a huge headroom, say, 250 meters. It pumps, of course, but it also consumes much more energy and is expensive. For a standard house with a height of the disassembly point of 10-15 meters above the ground, this is unnecessary. A competent calculation is needed. In our practice, before selecting, we always request a well passport or, if it does not exist, we help measure key parameters. Based on this, we are already looking at the line. For example, our QS series model may be optimal for such conditions - they have a wide range of pressures, and you can select them as close as possible to the required parameters, without unnecessary “power”.

Another point is installation. At this depth, quality suspension is critical. The cable must be made of stainless steel, the cable must be submersible, with a water seal. You often see the pump hanging on the same electrical cable - this is a grave mistake. The cable is for commutation, not load. And the descent/ascent must be performed smoothly, without hitting the walls of the well. One scratch on the body and corrosion in the future is guaranteed.

A production look from the inside: how we do it

Our enterpriseZhejiang Yangzijiang Pumping Industry Co.,Ltd, is precisely designed for serial, but at the same time technologically advanced production of such units. Eight complete lines are not just assembly shops. It is a closed cycle: from R&D and casting to final load testing. For 120-meter pumps, the key stage is testing on hydraulic stands, where operation at great depths with variable pressure is simulated. Without this, the product cannot be released.

Specifically for deep wells, we have two priority lines: standardsubmersible pumpsand multi-stage centrifugal. The latter are our strong point. Their design allows the required pressure to be achieved through a cascade of stages, with each unit undergoing separate testing. The material of the steps - wear-resistant polymer or stainless steel - is selected based on the intended application. It is important that we can vary the number of steps within one series in order to more accurately meet the customer’s parameters, those same “120 meters?” with the required flow rate.

Service is a separate issue. A deep-well pump lowered to 120 meters is not a unit that can be quickly pulled out and repaired. Therefore, at the production stage, the maximum resource is laid down. Bearings with increased service life, mechanical seals made of ceramic-graphite, careful balancing of the rotor - all this reduces the risk of sudden failure. We also post information on maintenance and typical faults onyangtzeriverpump.ru, so that installers and users have a hint at hand.

Practical advice on selection and operation

So, to summarize for someone who is looking for a pump for 120 meters. First, forget about one number “120”. You need a well passport: static/dynamic level, flow rate. If you don’t have a passport, call a specialist to take measurements. Second, consider not only the depth, but also the horizontal distribution throughout the house and the required pressure in the tap. Add a reserve of 20-30 meters of pressure to the calculated one. Third, look at the diameter of the pump body and your casing. The gap should be at least 5-10 mm.

When choosing a model, pay attention not to loud statements, but to specific characteristics: material of the flow path, type of motor (preferably with thermal protection), cable insulation class. A good sign is when a manufacturer, like us, specifies not only the maximum, but also the performance characteristics at different points on the pressure curve. This gives an understanding of how the pump will behave when the flow rate changes.

And lastly, do not neglect complete automation and high-quality installation. You can buy the best pump, but ruin it with improper installation. Make sure installers use stainless steel cable, crimp cable sleeves correctly, and install a check valve. After startup, for the first 24 hours it is worth observing the operation of the system: is there any frequent on-off switching, is the pressure stable. These observations can prevent future problems.

Instead of a conclusion: a thought afterward

Working with deep-well pumps, especially for such serious depths as 120 meters, is always a story about a compromise between cost, reliability and efficiency. There is no ideal solution for all cases. But there is an understanding that the key to long-term operation lies in precise selection for specific conditions and high-quality execution of the unit itself. This is what we are focused on inZhejiang Yangzijiang Pumping Industry Co.,Ltd, producing equipment that should last for years without hassle. After all, a well is a strategic object, and its heart should beat smoothly.