Ensure that the sewage pump facility is insured, and the company has a sewage pump facility
In order to ensure the operation of the sewage pump facilities, the company has more standard treatment of sewage pump facilities, annual overhaul, monthly secondary maintenance, and once-daily first-level maintenance policy. These ISO9002 quality management are guaranteed sewage pumps. In order to ensure the reliability of safe operation, the high-quality training and improvement of the skills of the operators are required to be implemented. The implementation of these safe operation policies and policies is to ensure the operation of the sewage pump equipment. The guarantee of reliability. The water of the water source is pressed into the heat pipe through the ballistic net under the action of air pressure (or water pressure). After many years of practical work and theoretical simulations, apply the knowledge learned to practical work, rationally arrange the distribution and arrangement of water, and apply the characteristics of each pump to achieve the maximum water output of the pump with the least amount of power. Achieve the best operational statement. Because the abnormal condition of a water pump will affect the network of the entire mountain supply system, it has serious consequences. Long-term high-tech innovation, enter a small amount of money to transform the water purification equipment that was originally left behind.
How to ensure the excellent water supply of the sewage pump, the company has taken a series of measures: mobilizing the rational configuration of the sewage pump equipment, and implementing the best combination of man and machine. The lack of these measures illustrates the rationality of the rational allocation of sewage pump equipment and water purification equipment. Enter funds, retrofit old equipment, old ballistic nets, improve the hydraulic environment, install static mixers, etc. The overflow components of the sewage pump include: a suction chamber, an impeller, and an extrusion chamber. Before the pump is working, the pump body and the heat-dissipating tube must be filled with water to form a vacuum form. When the impeller rotates rapidly, the blade sends water quickly and smoothly, and the swirling water is flying away from the impeller under the action of centrifugal force. After the water is thrown, the center of the impeller integrally forms a vacuum region. Such as: the safest mode of operation, Shanghai’s urban cooling pipeline network is interoperable, there is a company center arrangement room to dominate the water supply pressure in the region, too high to form a burst tube, to the masses, the state to form property losses, water pressure is too low It affects the electricity consumption of the whole user and forms a good abstraction of the enterprise. When it comes to economics, the cost of water for enterprises, including electricity, antimony, chlorine, and ammonia, must dominate the economic activities of enterprises and improve the economy in the safest way of operation, the best arrangement, and the lowest water cost. Benefits, companies have accumulated some experience in this area. The reliability of the safe operation of the sewage pump sewage pump equipment. Install forty instruments and use modern monitoring systems to monitor and dominate the entire process of soil quality to ensure excellent water.
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What are the hydraulic losses of centrifugal pumps?
The hydraulic loss of the centrifugal pump has impact loss, vortex loss and friction loss along the path.
First, the impact loss
Each pump has its own design flow. When the consumption is under the design flow condition, the flow at the inlet enters the impeller along the blade, so no impact with the blade occurs, and the outlet flow does not occur. The impact of the pump casing is then more efficient. However, when the flow rate deviates from the design condition, the direction of the liquid flow deviates from the direction of the blade, causing an impact.
Second, the vortex loss
In the water pump, the flow cross section is a very complicated spatial section. When the liquid passes here, the flow rate is too small and the direction is constantly changed, so that vortex loss is inevitably generated. In addition, when the overcurrent surface has sharp corners, burrs, and dead water, the vortex loss is also increased.
Third, the friction loss along the way
Due to the roughness of the over-flow surface of the pump and the viscosity of the liquid, the frictional resistance loss occurs when the liquid swims. The size of the loss is expressed by the following formula;
Hm=AQ2 where A is the coefficient.
Painted on the coordinates, it is a parabola with the origin as its apex.
In the hydraulic loss of each part, the hydraulic loss in the impeller is the largest, accounting for about half of the total black and white loss; secondly, the hydraulic loss at the turn of the vane, accounting for about 1/4 of the total hydraulic loss, and the remaining 1/ 4 Hydraulic loss, loss in the impeller to the guide vane, the guide vane diffusion part, the anti-guide vane to the impeller inlet and other parts.
In order to reduce the hydraulic loss of the pump, the cross-section of the flow should be changed gently and the speed should be reasonable. And choose the appropriate impeller, vane type and entrance and exit placement angle. In addition, the surface finish of the overcurrent components should be increased.
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How to store and transport deep well submersible pumps?
Nanjing Forever Sewage Treatment Equipments Co., LTD. is a professional submersible pump manufacturer. In the selection of customer submersible pumps, our company’s pump manufacturers will provide pre-sales services such as submersible pump models and submersible pump prices for customers’ reference, and my pump manufacturers can provide customers with customized pump products. This product information is about how deep well submersible pumps are stored and transported:
1. Storage of deep well submersible pumps
1. The deep well submersible pump should be stored in a dedicated warehouse for dry work. It is strictly forbidden to be placed outdoors for a long time. Always protect the threads at both ends of the thread during transportation and storage to prevent foreign matter from entering the pump.
2. To establish a deep well submersible pump file, record the service process, maintenance record, inspection certificate and tracking card of the deep well submersible pump.
3. For the well pump with the packing box, it should be placed on the flat concrete floor; for the deep well submersible pump without the packing box, it should be discharged on the pump frame with 3 fulcrums. The two ends are not more than 1m.
4. It is necessary to store the spare deep well submersible pump for a long time. It should be coated with No. 20 oil to prevent corrosion.
Second, the transportation of deep well submersible pumps
1. When transporting the deep well submersible pump, the deep well submersible pump should be used to fix the pump on the pump frame. When there is no special vehicle, the length of the slot should be no less than the pump length. Pulled by truck. It must be leveled with the support, and the length of the pump end should not exceed 1.5m. At the same time, the deep well submersible pump must be fixed to the tank to prevent bumps and foreign objects from colliding and damaging.
2. The wire must be worn at both ends during the transportation process. Prevent the plunger from escaping and foreign matter from entering the pump.
3. When handling short-distance manpower, it should be no less than 3 people and evenly distributed along the whole length.
4. Lifting should be carried out according to the lifting position designed on the package. When lifting a single pump, use a crossbar that is half the length of the pump.
Thank you very much for visiting and reading the above! This article is about how to store and transport deep well submersible pumps. If you want to know more about this issue, or want to buy this related product, please contact our customer service staff directly. Our company also produces self-priming pump, at any time. Welcome your inquiry.
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What are the application conditions of large flow submersible pumps?
Pumping medium: similar to clean water, liquid with a solid content of not more than 0.02%
Medium temperature: 40°C for ordinary pump and 120°C for hot water pump
Media PH value: 3 to 10
Power requirements: frequency is 50Hz, 60Hz (can be customized), rated voltage 380V [660V, 1140V, 3000V, 10KV] ± 5%
Technical parameters
Flow range: 5 to 650 cubic meters / hour
Lift range: 2 to 1500 meters
Power range: 3 to 410kW (secondary speed motor, customizable four or six motor)
Speed: 2900 rpm (secondary speed motor)
Optional material: HT200, 304, 316, 316L, tin bronze large flow submersible pump
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Supply and demand of pump market
Pumps are general-purpose mechanical products. China’s pump products have approximately 450 series and more than 5,000 specifications. They are widely used in agriculture and water conservancy, construction industry, petroleum industry, power industry, shipbuilding industry, mining, metallurgical industry and environmental protection industries. . In recent years, with the rapid growth of the domestic economy, the market’s demand for pump products has also grown rapidly. According to statistics from the Industrial Pump Research Institute of Zhejiang University of Technology, the sales revenue of the pump industry in China exceeded RMB 100 billion in 2009, and the industrial output value of the industry was around RMB 108 billion, with a balance between production and sales. The regional industrial output value of the industry is: 26 billion yuan in Wenling, Taizhou, 10 billion yuan in Wenzhou Yongjia, 5 billion in Hangzhou, 15 billion in Shanghai, 6 billion in Shandong, 8 billion in Shenyang, and Dalian 6 billion yuan, 5 billion yuan in Guangzhou, 3 billion yuan in Beijing Tianjin, 2.5 billion yuan in Shijiazhuang, and Changsha 25 In recent years, the pump industry has maintained a momentum of rapid growth. In 2007, the growth rate was 23.20%, but due to global finance Affected by the economic crisis, the growth rate of the industry in 2008 has dropped slightly, to 13.5%. With the rapid development of the pump industry and the fierce market competition, the growth rate of the pump industry will tend to be stable, and it is expected that the future.
The five-year industry development rate is between 13% and 17%. The industry’s development focus will shift from quantitative growth to quality improvement.
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How to improve the anti – cavitation performance of centrifugal pump
(1)Improve the centrifugal pump suction port to the impeller near the structural design. Increase the flow area; increase the radius of curvature of the inlet section of the impeller cover, reduce the rapid acceleration and decrease of the liquid flow; reduce the thickness of the inlet of the blade, and make the leaf inlet rounded so that it is close to the streamline, Reduce the speed of the blade around the blade and increase the surface of the impeller and the blade surface to reduce the loss of resistance;
(2)Use pre-induction wheel, so that the flow in the pre-induction wheel in advance to work to improve the flow pressure.
(3)Use double suction impeller, so that the flow from the impeller on both sides of the same time into the impeller, the import cross-section doubled, the import flow rate can be reduced by double.
(4)The design of the use of slightly larger positive angle to increase the blade inlet angle, reduce the blade at the entrance of the bend, reduce the blade blockage to increase the import area; improve the working conditions under high flow to reduce Flow loss. But the angle should not be too large, otherwise the impact of efficiency.
(5)Use anti-cavitation materials. Practice shows that the higher the strength, hardness and toughness of the material, the better the chemical stability and the stronger the resistance to cavitation.
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Fast and easy assembly of multi-stage centrifugal pump
Multistage centrifugal pumps should be placed as far as possible in a well ventilated place to facilitate rapid cooling and reduce motor temperature. Otherwise, run for a long time, easy to burn the motor.
If the use of multi-stage centrifugal pump, because did not remove the plastic film covered in the motor, causing the motor overheating, burn the coil. In addition, before starting, be sure to check the water inside the pump, otherwise, not only affect the self-priming performance, and easy to burn the shaft seal parts. Under normal circumstances, multi-stage centrifugal pump starts after 3 to 5 minutes that should be out of water, or should immediately stop inspection.
When the multi-stage centrifugal pump once a failure, avoid their own hands. Because of their own demolition, I do not know where the fault caused by blindly split a pass; Second, no special tools and often damage the original good parts. The best way is to have experienced, large-scale maintenance point repair, and timely replacement of “overage” parts and some wearing parts. Under normal circumstances, multi-stage centrifugal pump should be repaired once every six months, put an end to “sick” work.
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The main purpose of low temperature submersible pumps
The use of low-temperature submersible pumps is mainly used in oil and chemical plants to transport liquid hydrocarbons, liquefied natural gas and liquid nitrogen and liquid liquefied gas in refrigeration systems. Therefore, it is also called cryogenic pump.
The installation of the cryogenic pump and the operation of the cryogenic pump are:
1) cryogenic pump assembly parts are strictly prohibited with water and grease, parts must be washed with a solvent clean, dry and then assembled.
2) not only the cryogenic pump itself to be cold, low temperature pump suction line must also have cold measures to prevent the heat in the operation from the outside, so that the liquid vaporization, affecting the performance of the pump.
3) If there is oil, moisture and air in the cryogenic pump and piping, it will freeze when it enters the cryogenic liquid, so it needs to be cleaned before the cryogenic pump is put into operation and then scavenged with dry nitrogen. Pump the water and air, and pre-cooling.
4) The suction port and the suction pipe of the cryogenic pump should have the exhaust device so that the pump can remove the gradually accumulated gas before and during the operation to ensure the reliable operation of the cryogenic pump.
5) In the case of explosive gas, the motor should use vertical explosion-proof motor.
6) low temperature transmission can also use low temperature shielding pump or stainless steel magnetic pump.
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Miniature submersible sewage pump seal leakage caused by grinding axis phenomenon
(1) Small pump seal failure below 715kW often produce grinding shaft, grinding shaft position mainly in the following: dynamic ring auxiliary seal, static ring position, a few springs have grinding axis phenomenon.
(2) The main reasons of grinding: ① BIA-type double-ended mechanical seal, back pressure state is a bad working condition, the media particles, impurities are easy to enter the sealing surface, so that the seal failure. ② The main part of the grinding shaft is rubber bellows, and because the upper sealing surface is in bad lubrication state, the friction torque between the static and dynamic ring is larger than the transmission torque between the rubber bellows and the shaft, and the relative rotation occurs. ③ Dynamic and static ring auxiliary seal due to the sewage in the weak acid, weak alkali corrosion, rubber pieces have been inelastic. Some have rotten, lost the proper function, resulting in the phenomenon of grinding shaft.
(3) To solve the above problems, now take the following measures: ① to ensure that the lower end of the cover, the cleanliness of the oil chamber, not clean the oil prohibited assembly. ② machine oil chamber oil tank line should be higher than the static and dynamic ring sealing surface. ③ according to the use of different media use different structure of the machine seal. For high-lift pump should be re-designed mechanical seal structure, the corrosive media rubber should be selected weak acid, weak alkali of fluorine rubber. Seal ring should be added to the ring.
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The status of pump maintenance in recent years
Pumps are widely used in power, chemical, metallurgy, petroleum, agriculture and other sectors of the national economy, is the energy onsumption of large, annual power consumption of the pump accounts for about 1/5 of the total power generation. Therefore, it is very important to improve the safety and economy of the pumps in various production systems. Rapid diagnosis of pump failure, reasonable maintenance of equipment, and constantly improve the operation of the pump in the system effect is engaged in pump equipment design, installation and maintenance of engineering and technical personnel common goal.
In recent years, there are some weak links in the field of pump maintenance, the quality of work and work efficiency are inadequate, the main reason is that a large number of mechanical engineering graduates in the years after graduation, the work is done and maintenance, And engineering students in the school almost no maintenance of equipment in the field of formal training; industrial production in the actual repair business, more by the experienced but no academic engineers or workers to deal with these people also lack the basic training of various basic training , So can not carry out a high level of maintenance work; pump maintenance project managers have received high engineering education, generally only from the instructions to engage in repair, and equipment designers generally lack the use of experience, but also from the user feedback is less, So the development of the pump maintenance instructions are not necessarily reasonable.
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