The working practices during the period summed up a few points about the installation of submersible pumps.
Construction and installation of tube wells generally includes drilling of wells, installation of wells, closure of wells, well washing, pumping tests, construction of wells, and installation of well pumps. It can be seen that installing the well pump is the final completion of the well completion.
Well pumps are pumps designed for pumping deep wells from tens of meters up to 100 meters or even up to 1000 meters. Due to the limitations of the diameter of the wells being controlled, they are usually single-suction, multi-stage vertical pumps.
Well pump according to its structure is divided into two categories of long-axis deep well pump and submersible pump, long-axis deep well pump is mostly D-type, which is characterized by easy to eliminate motor failure. However, it has a long drive shaft, consumes more steel, is troublesome to install and repair, and has low transmission efficiency. This is its shortcoming.
From the perspective of all the water wells currently under construction in our country, the majority of Q50 and Q80 submersible pumps for wells are used in both domestic water supply wells and injection wells.
This type of pump is submerged under water by a Q-type submersible pump and a YQS-type submerged motor. It has the advantages of simple structure, small size, light weight, convenient installation and maintenance, safe and reliable operation, high efficiency and energy saving. The disadvantage is that its motor part has a special structure and maintenance is difficult.
1.1 Model Significance (see) 1.2 Conditions of Use Solids content in water (by mass) is not more than 0.01%. 1.3 Configuration of submersible electric pump Q-type submersible electric pump is mainly composed of Q-type submersible pump and YQS submersible motor.
The pump body of the Q submersible pump is located at the upper end of the motor. The impeller is of centrifugal type. The bearing lubricates the rubber bearing with water, and the pump is rigidly coupled with the shaft coupling of the motor shaft. A check valve body is provided at the upper end of the pump to prevent reverse rotation of the submersible pump due to water backflow when the pump stops.
YQS-type submersible motor stator windings use polyethylene insulated nylon sheathed magnet wire.
The motor chamber is filled with clean fresh water to cool the motor and lubricate the bearing. The rubber internal pressure regulating membrane in the motor can adjust the differential pressure of the clear water in the body caused by the temperature increase of the motor. The sand ring and two anti-sanding devices installed in reverse to prevent the mud sand from entering the body.
1.4 Inspection of well diameter before installation. Before loading the pump, check that the diameter of the borehole meets the requirements of the frame number. Well wall tube should be straight, so that the electric pump can move up and down freely in the well.
Wells for washing. The new wells must be washed well in time, and the Q-submersible pump must be installed after removing the mud sand.
Water quality inspection. According to the requirements of the conditions of use, the water quality of the well is inspected. This is performed by the water quality testing unit and a water quality test report is issued. If the water quality exceeds the specified range, the over-flow part of the pump will cause excessive wear and corrosion of the shaft, affecting the electric pump. Life expectancy.
Wells (seat) inspection. The inspection well (seat) can pump to bear the weight of the entire unit.
1.5 Preparation before Installation Since the electric pump bearing is made of water-lubricated material, it must not be dehydrated. Even during the short period of starting the motor, absolutely avoid dry running so as not to damage the pump bearings.
Inspection of the motor section: Before the motor goes down, check whether the assembly quality is good, whether the fasteners are loose, whether the cable is damaged, and whether the power supply and electrical device are reliable. Is the voltage and frequency of the power supply consistent with the nameplate? Check that the rotation of the motor shaft is flexible.
Check the water pump part: check whether the assembly quality of the water pump is good, whether there is looseness of the fasteners and whether there is any damage during transportation, whether the rotation of the pump shaft is flexible, whether the axial narrow amount meets the requirements, and whether the check valve is operated.
Before the water pump is placed in the well, the motor must be filled with clean water (not including sand). (Finance-content is particularly large Ele Gal also PublishingHou (s4 after the motor water, s Lin investigation of the touch and leakage phenomenon at the genus, Geological Engineering, Guangzhou Outer Ring Road, soft soil engineering geological characteristics and soft ground treatment measures discussed Cao Lianhai, Jiang Jinghong 2, ZHAO Mingxian 3, ZHANG Hao, YANG Guili 4(1. Department of Geotechnical Engineering, North China Institute of Water Conservancy and Electric Power, Zhengzhou 450008, Henan, China; 2. China 13th Engineering Bureau of Water Conservancy and Hydropower, Dezhou, Shandong 253015, China; 3. Henan Provincial First Hydraulic Engineering Bureau, Zhengzhou 450001, China ;4. Geotechnical Laboratory, Guangdong University of Technology, Guangzhou 510640, China) Construction of similar projects.
1 Overview of Engineering and Physical Geography The Guangzhou University City Planning District is located on Xiaoguwei Island in Panyu District in southeastern Guangzhou. Except natural villages, the island is mainly composed of paddy fish ponds, and there are wharfs, oil depots and small factories around the island. The islands have developed well-developed vegetation on the residual hills, and Xiaoguwei Island has poor external traffic conditions. Except that there is a concrete bridge and Cheung Chau Island on the northeast, the rest communicates with the islands by ferries. The outer ring road of the university city is the outermost side of Xiaoguwei Island. Circular roads with a road width of 60m are the main roads in the city, and the outside of the outer loop is a wetland reserve.
Xiaoguwei Island is surrounded by water on all sides. The low-flat area around the island is a floodplain landform with a high topography in the central and northern parts of the island. The overall landform is a eroded residual hilly landform. The floodplain is flat with a natural surface elevation of 5.00~7.00m, which is part of the flood period. Submerged, erosional hilly terrain is higher in the middle and lower in the east and west.
2 Distribution of soft soil on the outer ring road and its engineering geological characteristics Through engineering geological survey, it was found that the soft soil in this section is mostly black-gray, flowing plastic, plastic, saturated, containing fine sand and a large amount of organic matter, mainly silt, part The main physico-mechanical properties of clay soft soil with soft plastic or hard plastic distribution are shown in Table 1).
Table 1 Main physical and mechanical properties of soft soils Index Soft soils Classification Natural water content Natural porosity ratio Natural bulk density Compression coefficient Consolidation coefficient Mechanical index Cv (XI (T6 (fast shear) silt silt soil silty clay soil average 0.57 per silt The distribution thickness of the soil layer can divide the silt into the section of >3m. For the section with the distribution thickness of >3m, the elevation of the roof is 0.5~2m. If there is water seepage, measures should be taken to deal with it.
According to the process method of the cable joint technology (refer to the instruction manual), connect the motor outgoing cable with the supporting external rubber cable. Inspect the winding (including the outgoing cable) to the insulation resistance of the base is not less than 200M from the well section to check whether the rotation of the pump is flexible, if there is stuck phenomenon, should identify the reasons for exclusion.
Connect the pump and motor together and fasten them with screws.
1.6 Required equipment and tools for installation Reliable lifting equipment (such as small cranes) Suitable wrenches, hand hammers, screwdrivers, electric tools, Megohmmeters, clamp ammeters, etc.
1.7 Installation of the electric pump Connect a short water pipe to the check valve body of the electric pump and clamp the clamp plate at the proper position of the pipe. Lift the electric pump and slowly put it into the well, wait until the clamp is reliably placed on the well platform, release the hook, and reliably connect the second section of pipe to the first section of pipe, tighten the screw, and then remove the first Pay the splint, continue to drop the pump according to the above method, install all the pipes (plumbing) and finally clamp the splint in the proper position of the pipe, firmly fix it on the well platform, and connect the water pipe (head) to the pump. Diving below the dynamic level, the bottom is not less than 3m from the bottom of the well, but the immersed depth must not exceed 70m. The motor part can not be installed to contact the sediment. Otherwise, the motor will overheat due to poor heat dissipation.
When the cable is installed in the downhole, it should not be distorted and excessively tensioned. Use wire to bind the cable to the upper and lower ends of each section of the water delivery pipe (plumbing pipe).
During the installation process, the insulation resistance is measured at any time. Check the insulation resistance of the motor after going downhole shall not be less than 5MQ. Connect the supporting electrical equipment before starting.
2 Conclusions Continuous practice and exploration can improve the installation quality of wellhead submersible pumps and ensure the installation is standardized and durable. In addition, the continuous downtime of the installed submersible pump shall not exceed 14d. Otherwise, the impurities in the water will precipitate in the gap between the bearing and the impeller, and even the shaft of the pump will be blocked. If the working environment requires the shutdown time exceeds 14d, the system shall be operated at least once every 14d for 5min to ensure that the unit is ready for use at any time.
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