The whole process of installation of submersible sewage pump auto-coupling equipment
The submersible sewage pump integrates a pump and an electric mechanism. Its machinery and equipment are similar to other types of centrifugal water pump machinery and equipment. The general approach is: first carry out the foundation construction of the centrifugal water pump, and wait until the foundation of the centrifugal water pump generator set reaches the standard. Carry out the installation of pump casings and water outlets, accessories and equipment.
The submersible sewage pump is generally set in the sump (pit), and the machinery and equipment are divided into mobile machinery and portable machinery and equipment. Portable machinery and equipment are very simple. They are commonly used in small water pump machinery and equipment. Plastic hoses are generally used for the water outlet. Mobile machinery and equipment are rather chaotic. This type of machinery and equipment is generally used for large-scale submersible sewage pumps containing fully automatic coupling machinery and equipment. The sequence of machinery and equipment is: pouring concrete foundation, guide rod and pump seat, pump casing, water outlet and accessories.
Installation of submersible sewage pump: Lift the pump casing, and place the coupling equipment (coupling equipment, submersible sewage pump and electric motor are generally made into a complete set of machinery and equipment) in the guide rod, so that the pump casing is slowly reduced along the guide rod until the coupling The combined machinery and equipment are connected with the outlet elbow on the pump base, and the outlet axis of the centrifugal water pump overlaps with the inlet axis of the outlet elbow.
Installation of water outlet and accessories: The outlet of the centrifugal water pump and the outlet elbow are connected by flanges, and other accessories on the water outlet, including stop valves, compensators and check valves, are connected by flanges.
When the pump casing is being overhauled, people do not need to enter the sump (pit). Manual services or mechanical equipment can be used to clearly raise the pump casing from the sump (pit) pipe with an iron chain connected to the pump casing. The lifting support frame can be used as a long-term support frame or a temporary support frame. The lifting support frame is provided with an electric type, hand chain hoist or movable pulley, which is connected with the lifting iron chain.
Screw Impeller Pump
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Different arrangements of stainless steel centrifugal pumps on different occasions
Stainless steel centrifugal pumps have many advantages such as wide range of performance, small size, simple structure, easy operation, and low operating cost. Generally, the flow and pressure of the selected centrifugal pump may be inconsistent with the requirements in the pipeline, or due to changes in production tasks and process requirements, the flow adjustment of the pump is required at this time, which essentially changes the operating point of the centrifugal pump.
The requirements and methods for the arrangement of stainless steel centrifugal pumps are very similar, but as a basis for the stability of stainless steel centrifugal pumps, the knowledge of the layout must be proficient.
First, talk about the arrangement of stainless steel centrifugal pumps, which can be arranged in the open air, semi-open air, or even directly indoors. When it is arranged in the open air, it is generally under or on the side of the pipe gallery, or it can be arranged near the suction equipment, mainly because these locations are well ventilated and easy to operate and maintain.
The reason why the stainless steel centrifugal pump is chosen to be arranged in a semi-open air way is mainly for rainy areas. The pump can be arranged below the pipe gallery and the ceiling can be arranged above the pipeline; or the pump can be arranged on the lower floor of the frame to frame The platform acts as a ceiling.
In some cold and sandy areas, where the process is known to have special requirements, indoor layout is a better choice for stainless steel centrifugal pumps, which can adequately protect the equipment and reduce the adverse effects caused by external environmental factors. influences.
For stainless steel centrifugal pumps arranged in the open air or semi-open air, the axis of the pump and the prime mover should be perpendicular to the axis of the pipe gallery; for indoor pumps, when the temperature of the liquid being transported is higher than the auto-ignition point or the liquid is a liquid hydrocarbon, The other pumps are placed in their own rooms and separated by a firewall.
Moreover, the net distance between the pump end or the pump side and the wall, and the net distance between the two rows of pumps cannot exceed the specified standards. Of course, how to arrange it depends on the specific type and specifications. In short, it is necessary to ensure that the stainless steel centrifugal pump can function normally. Operation, but also to facilitate future inspections and maintenance.
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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 advantages of a submersible sewage pump?
1. The submersible sewage pump has compact structure, small volume, convenient movement and easy installation. It does not need to build a sewage pumping station, and it can work by diving into the water, greatly reducing the project cost.
2. The submersible sewage pump adopts double lower water absorption structure with low water absorption position. Because of the double suction type double flow channel single volute structure, the motor has no axial pulling force, which reduces and balances the light direction force and greatly improves the service life of the sewage pump. Times, the use efficiency is increased by 15%.
3.The use of large flow channel anti-blocking parts design, greatly improve the ability of dirt to pass, can effectively pass shorter fiber material and smaller diameter solid particles.
4. The sewage pump equipped with the external circulating water device can work continuously for a long time in the low water level. The large-flow submersible sewage pump with self-stirring impeller has an automatic mixing function, which can stir the water in the pool to make the sewage and dirt mix and discharge with the sewage pump.
5. The submersible sewage pump float switch can automatically control the stoppage of the sewage pump according to the required water level change, without special care.
6. The submersible sewage pump can be equipped with automatic safety protection control cabinet according to the user’s needs to monitor the leakage, leakage, overload and over-temperature of the large-flow submersible sewage pump to ensure reliable and safe operation of the sewage pump.
7. The double-rail automatic coupling safety system brings great convenience to the installation and maintenance of the large-flow submersible sewage pump. People do not have to enter and exit the sump for this purpose.
8. The characteristic is that there is a water leakage probe in the oil chamber. When the mechanical seal on the sewage pump side is damaged, the water enters the oil chamber, and the probe sends a signal to protect the sewage pump.
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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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Stainless steel self-priming pump routine maintenance knowledge
The stainless steel self-priming pump is a common pump valve with simple and reliable structure and durability. However, quality products and equipment also require regular maintenance. This not only avoids some accidents, but also greatly increases the service life of pump and valve products. Under normal conditions of the pump, it is generally not necessary to open the maintenance frequently. General maintenance of the pump should pay attention to several main parts:
1. Rolling bearing: When the bearing wears to a certain extent after long-term operation, it must be replaced.
2. Front seal ring and rear seal ring: When the seal ring wears to a certain extent, it must be replaced.
3, mechanical seal: mechanical seal in the case of no leakage, generally should not be opened for inspection. If a serious leak occurs at the lower end of the bearing body, the mechanical seal should be disassembled. When assembling and disassembling the mechanical seal, it must be taken lightly, pay attention to the cleaning of the mating surface, protect the mirror surface of the static ring and the moving ring, and it is strictly forbidden to strike. The reason for the leakage due to the mechanical seal is mainly due to the friction of the mirror surface. The repair method: the end surface of the friction pair can be ground to restore the mirror surface. Another cause of mechanical seal leakage is the improper installation of the O-ring or the aging of the O-ring. At this point, the O-ring needs to be replaced for reassembly.
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Working principle of submersible sewage pump
The submersible sewage pump does not need to build a pump house, and it can work without directly diving into the water. The working principle of the submersible sewage pump and the submersible sewage pump are similar to those of the pump. The submersible sewage pump is mainly composed of an impeller, a pump body and a submersible motor. The water pump and the motor are on the same shaft. The water pump is located at the lowermost end of the submersible sewage pump, which can maximize the suction of the surface sewage. Because the submersible sewage pump has compact structure, small floor space, convenient installation and maintenance, long running time, no cavitation damage and irrigation water, the submersible sewage pump is widely used in cement plants, power plants, coal processing industries, Steel mills, petroleum, chemical and municipal wastewater treatment.
The submersible sewage pump adopts a unique single-blade impeller structure or a double-bladed impeller structure, which greatly improves the dirt passing ability. Some submersible sewage pumps also have a function of mixing or shredding, which can pass the pump diameter of 5 times the fiber material and the diameter of the pump. A solid particle of about 50% caliber. The submersible sewage pump is mechanically sealed with a new type of hard and corrosion-resistant tungsten carbide material, which can be placed in the oil chamber for a long time. The submersible sewage pump has two different installation methods, a fixed automatic coupling installation system and a mobile free installation system.
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Basic application and structure of submersible axial flow pump and mixed flow pump
ZQB series submersible axial-flow pump and HQB series submersible mixed flow pump are widely used in Agriculture, Industry and Civil engineering for drainage and water-supply, etc.. These pumps are features for low cost, easy installation, high reliability and can be automatically controlled.
Operation conditions:
1. Maximum medium temperature 50℃
2. PH 5~9
3. For pumping clear water or liquid physical character similar to water or liquid with little solids.
4. The pump can be stared 6-times each hour at the most with equal interval time.
5. Maximum submerged depth is 10 meters.
DESCRIPTION OF CONSTRUCTION
The main feature of pumps are that two kids of seals are used that are effective and reliable moving & static seals. Static seals is suitable foe use in all mating faces of static parts. The mating faces of static parts is equipped with “O” oil-proof rubber sealing ring. The auxiliary sealing material is non-dried sealing glue. Cable is separately, water pressure-tight encapsulated connection with strain relief, anti-kink protection and single lead sealing. Three mechanical seals are used in series between shaft and casing. Two of them are placed in oil chamber, one is used for protecting the motor from liquid leakage, the other for protecting the oil chamber from water. The oil chamber acts as buffer for leakage between the motor and pump, meanwhile mechanical seals and roller bearing are lubricated in it.
The pump insulation is class “F”=155℃
Rotor is aluminum cased squirrel-cage and shaft is stainless steel and has been dynamically balanced
.
At the top of the pump, there is a screw hole which is used for air leakage test before ex-work that each pump has been carried foe a gas leakage test with air pressure 0.15MPa for 5 min..
The rotating part is borne by four bearing. Upper bearing is an centripetal ball bearing, middle bearing is a short cylindrical bearing with a separable internal ring, these bearings with stand radial load. A rubber bearing act as auxiliary role for withstanding radial load. A big size centripetal thrusting roller bearing are used in the pump in order to bear weight of all rotating parts which bearing has low temperature and middle bearings are lubricated by No.3 lithium lubricating grease. All bearing are SKF brand.
Rotating direction of the motors shall be anti-clock wise rotation from the view of shaft according to the requirement of pump.
All pumps are equipped with thermal sensors for monitoring temp. rise of the winding. By lower thrusting bearing, a special sensor is located in oil chamber to monitor temp. rise of thrusting bearing, a device with double electrodes is set at the bottom of inside chamber of motor, if water is leaking into chamber, and reaches a certain high level from the bottom of chamber, the value of the resistance will be varied which will be changed into a switching signal by a water lever relay built in a control device. A electrode stretched out of the lower cover is used to check leakage in oil chamber of pump, and signal is transmitted by a water-level relay in the control device.
The pump has two main power cables and one control cable. Two main cable should be connected in parallel according to the same mark.(U,V,W,) Some pump (power below 90kW without any special requirements) only has one main power cable. See sketch of connection of power cable.
Pump impeller is semi-adjustable. Impeller blades can be adjusted according to the requirement of work by means of unscrewing nuts on the blades, pulling up fixing pin, moving the blades and adjusted the basic line of blade to a required angle line on the hub, then inserting the fixing pin fastening the nuts. Because inner surface of shell of impeller is cylinder, diameter of impeller must be machined after angle of blade is changed (small than that specified in contract). All vanes of delivered pump have been adjusted to the required angle specified in a contract. Users can adjust the vane by themselves, but it shall be paid a green attention to whether over power or over current.
Oil chamber is filled with No.20 machine oil. The volume of stored oil is determined by seeing oil overflowed through hole. For oil chamber, there are two hole separately located by two sides, one is injecting oil, the other is air vent hole. When injecting oil into the chamber, two holes shall be opened. After injecting oil, two holes shall be screwed up with two spigots. It shall be paid great attention to check whether the square seals have been broken.
A rubber bearing is equipped just up the hub of the impeller and is lubricated by water. It offers the impeller more stability and acts as a role of auxiliary bearing.
PREPARATION FOR OPERATING
The structure must be handed over ready for installation and must be dry and clean. In particular the inlet chamber must be empty and dry.
“As built” drawings of the civil work must be available by the client/consulting engineers in good time before starting installation.
Before installation, checking the record of main parts dimensions according to drawing to ensure that they can be connected smoothly. Inspecting and cleaning flange connecting surfaces.
For no load running on the ground, running time must be less than 15 seconds.
Checking the insulation resistance of the stator’s winding with a ohm meter of 500MΩ class, and never allow lower than 0.5 MΩ. The protective devices also need to be checked with a universal meter in 1K Ω position according to the requirement.
A trash screen shall be put in front of inlet channel.
Checking the frequency and voltage of power, whether it is meeting with the value specified in nameplate, the deviation of frequency is 1%, voltage deviation is±5%.
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Failure analysis and maintenance of submersible pumps
| Analysis of cause | Method of treatment |
| 1) reverse rotation of pump | 1) cut off over all power supply of control case, change over any two phase conductors of power cable |
| 2) pumping head is to high | 2) check a. the type of pump is correct or not b. the size of riser pipe is correct or not |
| 3) the pumped medium passes by pass | 3) check that valves are shut or not, then test the pump at full load. |
| 4) leak of discharge pipe | 4) find leak point and repair it |
| 5) discharge pipe may be clogged with oxide deposits | 5) check pipeling, clean and replace it |
| 6) pump is locally clogged | 6) raise up and clean it, if it is put in straining net, checking cleaning will be required as well |
| 7) impeller bottom plate wear out | 7) raise up it, adjust or renew the bottom plate. |
1.No flow rate after operation
| Analysis of cause | Method of treatment |
| 1) air clogging | 1) a. open and shut valves continually several times b. start/stop the pump some times, interval of starts is 2~3 minutes. |
| 2) checking this charge valve | 2) according to different installations |
| 3) reverse rotation of pump | 3) refer to 1.1 |
2.Frequency of start and stop of the pump is too high
| Analysis of cause | Method of treatment |
| 1) preset time of float switch is too short | 1) adjust the float switch, prolong operating time. |
| 2) non-return valve is fault liquid reversely flows into sewage sump | 2) check and maintain it |
3.Stopping is fault
| Analysis of cause | Method of treatment |
| 1) stop function. Of float switch is fault | 1) check and replace it if required |
| 2)float ball is caught at “operating” position | 2) loose off it and change its position if necessary |
4.Pump can not be started, fuse melts or circuit breaker trips
| Analysis of cause | Method of treatment |
| 1) relay in fault | 1) send to service department for repairing |
| 2) float is fault | 2) check that the by pass float switch can start the pump or not, if it can, float switch must be checked |
| 3) winding, connector or cable breaks off | 3) check with ohmmeter, if break off is turn, check winding, connector and cable |
| 4) pump is clogged | 4) cut off power supply, remove the pump out of sewage pump, clean clogging materials, test before resetting |
| 5) interlock of water leak or electric leakage | 5) red neon shows electric leakage interlock, yellow neon shows water leak interlock, maintain them before putting into operation. |
5.Circuit breaker/overload protector trips after pump starting
| Analysis of cause | Method of treatment |
| 1) voltage is low | 1) a. check the voltage of control case, if the voltage, is too low, the pump can not be used temporarily b. if cable is too long, cause excessive voltage drop, shorten the cable as possible and select properly large size cable |
| 2) voltage is too high | 2) add a transformer, adjust the voltage into the rated area |
| 3) the connection of pump is wrong | 3) check the cable colored No. and the connectors’ label in control case, check the connection. |
| 4) short circuit | 4) if red neon lights for a long time, do repair before operation |
| 5) control box or capacitor is fault | 5) a. check the control box carefully, don’t replace the circuit breaker with new element whose data is larger than recommended value. |
| 6) sludge or other deposits is piled at the area of shell’s bottom plate | 6) clean the pump and sewage sump, referring to related parts in “Notes for transportation” |
6.Pump can not started, but fuse does not melt and overload protector does not trip
| Analysis of cause | Method of treatment |
| 1) no electricity | 1) a. check that the control box is electrified or not b. check carefully that the control box is fault or not |
| 2) break – off of winding, cable connecting terminals or control box | 2) check cable and motor’s connecting terminals and winding |
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