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| Email: | sales@sanchangpump.com |
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DGP Multistage Boiler Feed Water Pump Self-balancing
Classification:
BB4 Self-balancing Multistage Pump
DGP type self-balancing multistage boiler feed water pump
Electric power industry
Metallurgical industry
DGP type self-balancing multistage boiler feed water pump
Products
Key words:
water pump
Head range: 50~2000m
Conveying temperature: 0 ℃ ~ 80 ℃
Inlet pressure: allowable inlet pressure 0.6MPa
Sealing form: packing seal, mechanical seal
Water pump material: HT200, HT250, QT600, ZG, 304, 316, 316L, 317L, 904L, CD4-MCu, etc
Hotline:
- Product Description
- Performance Parameter
- Installation Drawings
- Installation And Use
- Faults And Solutions
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- Commodity name: DGP Multistage Boiler Feed Water Pump Self-balancing
Flow range: 3.75~1400 m3/h<br>Head range: 50~2000m<br>Conveying temperature: 0 ℃ ~ 80 ℃<br>Inlet pressure: allowable inlet pressure 0.6MPa<br>Sealing form: packing seal, mechanical seal<br>Water pump material: HT200, HT250, QT600, ZG, 304, 316, 316L, 317L, 904L, CD4-MCu, etc</br></br></br></br></br>
Product Description
DGP type self-balancing multi-stage boiler high-pressure feed water pump is mainly used for conveying water containing no solid particles, the temperature is -20 ℃ ~ 150 ℃ or the physical and chemical properties are similar to water liquid, suitable for medium, low pressure and high pressure water supply. DGP type self-balancing multi-stage boiler feed water pump materials are HT200, OT600, 304, 304L, 316L, 317L, 904L, CD4, etc.
Overview
DGP self-balancing multi-stage boiler feed pump is an advanced multi-stage centrifugal pump product with high efficiency, energy saving and long service life designed to meet the needs of users. It adopts foreign high-efficiency and energy-saving water conservancy model, which changes the design of traditional multi-stage pump with balance device and accelerates the technical development of high-pressure multi-stage pump. According to the API610 standard R & D and manufacturing, in the industry in the leading position of technology. It has the advantages of wide high efficiency area, wide performance range, good cavitation performance, safe and stable operation, low noise, few wearing parts, and convenient installation and maintenance.
Structure Description
DGP type self-balancing multi-stage boiler feed pump has reformed and innovated the traditional structural form, canceled the axial force balance mechanism of multi-stage centrifugal pump and canceled the balance plate device, which is the best replacement product of D and DG multi-stage centrifugal pump.
DGP type self-balancing multi-stage boiler feed pump has no balancing device, I .e. no disc friction loss of balancing disc and no backflow loss of balancing water, so the pump efficiency is 5 ~ 14% higher than that of multi-stage pumps of the same category, and the shaft power of the pump is reduced without friction of balancing disc, thus achieving an energy-saving effect, so the power consumption of the pump during operation is about 3% higher than that of multi-stage pumps of the same category. At the same time, it completely solves various faults such as the wear of the balance disc and the balance ring or the rotor seizure caused by the failure of the balance device. Its design extends the service life of the pump. The trouble-free running time is more than 3 times that of ordinary pumps, and the maintenance cost of users is greatly reduced, thereby reducing the life cycle cost of the pump. Years of operation has proved that the performance of the product has reached the advanced level of similar products in the world.
Use
It is mainly used for conveying clear water without solid particles and at a temperature of -20 ℃ ~ 150 ℃ or liquids with physical and chemical properties similar to clear water. It is suitable for medium, low pressure and high pressure water supply.. It can also be used to transport hot water, oil, corrosive or abrasive media at temperatures ≤ 185 ℃ by changing the material (and structure) of the pump, sealing form and increasing the cooling system. Materials are HT200, QT600, ZG, 304, 304L, 316L, 317L, 904L, CD4 and other materials for users to choose from.
Model Description
Example: DG280J-43X8P
DGP-energy efficient self-balancing multistage boiler feed water pump
280-Flow at design point (m3/h)
J-Mechanical seal (not marked as packing seal)
43-Single stage head of pump at design point (m)
8-The number of stages of the pump is 8
Performance characteristics
1) High efficiency and energy saving: adopt advanced hydraulic model and independently develop high efficiency and energy saving products; As the pump rotor has no wear and axial pulsation of the balance disc, the alignment between the impeller and the guide vane is always in the best state, and the efficiency of the common multi-stage pump structure will not decrease obviously with the wear of the balance disc and the forward movement of the rotor components. In addition, there is no leakage of balance water, which reduces volume loss and improves the overall operation efficiency of the pump, the shaft power is reduced, and the average efficiency is 2%-3% higher than that of ordinary multi-stage pumps;
2) New structure: with symmetrical arrangement of impeller rotor components, the axial force generated by symmetrical impellers at all levels cancel each other out, and the automatic balance of huge axial thrust in the pump cavity can be realized without using the balance disc structure, breaking through the traditional structure of multi-stage pumps;
3) New technology: unique throttling and decompression devices, odd-level balancing devices, and can also play an auxiliary supporting role;
4) High reliability: The symmetrical arrangement of the impeller makes the axial thrust generated during operation basically self-balanced, so that there is no need for a balance disc device with small gaps, high pressure drop, easy erosion, easy wear, and easy failure. The adverse effects of axial force load on pump wear and system interference are minimized. The residual axial force is borne by the thrust bearing, so that the pump shaft is always in a state of tension, the force state of the shaft is uniform, and the stress peak is greatly reduced compared with the prototype structure, thereby improving the rigidity and critical speed of the pump rotor, so that the pump rotor operation The stability and reliability are significantly improved;
5) Good cavitation performance and long service life: optimized hydraulic and structural design, precision casting, reliable wear-resistant materials, some models of pump first-stage impeller adopts double-suction structure, so that the pump has good anti-cavitation performance, and the whole machine runs Smooth, low noise, long service life;
6) machine seal strong reliability: pump start, stop when the rotor parts no axial movement, no axial pulsation, work has been plagued by multi-stage pumps to overcome the poor reliability of the machine seal has been the problem;
7) Widely used: cancel the small gap balance disc, than the traditional multi-stage pump structure to adapt to the nature of the medium is more harsh occasions;
8) Low maintenance cost: The use of precision casting reduces the number of wearing parts and maintenance disassembly and assembly, prolongs the life of the product, avoids a series of problems caused by excessive disassembly and assembly to the greatest extent, and reduces maintenance costs;
9) Convenient maintenance: the whole product adopts three-dimensional design and numerical control processing of rotor parts, which strictly ensures the processing size and processing accuracy of each part; Accurate positioning, ordinary technicians can complete it as long as they follow the assembly sequence and requirements of the assembly drawing; It is completely avoided that the old multi-stage pump must be adjusted by professionals to locate the axial movement size, which brings great convenience to users.
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Flow range: 3.75~1400 m3/h
Head range: 50~2000m
Conveying temperature: 0 ℃ ~ 80 ℃
Inlet pressure: allowable inlet pressure 0.6MPa
Sealing form: packing seal, mechanical seal
Water pump material: HT200, HT250, QT600, ZG, 304, 316, 316L, 317L, 904L, CD4-MCu, etc
Note: The listed performance parameters are in the normal temperature and clean water state.
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Preparation before 1. installation
1. Determine the installation location of the multi-stage pump: the location where the installation is stable and easy to operate, repair and overhaul should be selected.
2. Confirm the location of the water injection port: the water injection port should be set at the inlet pressure pipe and about 20cm away from the pump to avoid backflow and change the impeller speed of the multi-stage pump.
3. Deal with the inlet pressure pipeline: prepare the pipeline and flange connection part to ensure that the connection part is free of foreign matter or rust.
4. Prepare the power supply and cables: select the appropriate cable according to the power requirements of the multi-stage pump, and ensure that the cable quality is good.
2. installation steps
1. Assemble the components: Assemble the components according to the requirements of the instructions or drawings, and determine the positions of the drain, vent, and lubrication parts.
2. Install the multi-stage pump: place the multi-stage pump in the installation position, pay attention to the smooth contact between the base of the multi-stage pump and the ground, and the seat surface of the base is perpendicular to the ground.
3. Interface connection: connect the inlet pressure pipe and the outlet pressure pipe. The connecting flange shall be parallel and horizontal without distortion and deformation.
4. cable wiring: according to the multi-stage pump electrical connection diagram wiring, pay attention to the standardization of wiring and reasonable wiring.
5. Water injection and drainage: open the stop valve of the inlet pressure pipe of the multi-stage pump, and introduce clean water (or including the added pump irrigation and drainage liquid) into the pump to avoid abnormal noise caused by pump vibration.
6. Adjust the pump: adjust the frequency converter or on-demand reducer to ensure that the motor of the multi-stage pump works normally and the water flow speed is moderate.
Inspection after 3. installation
1. Check the overall installation of the pump: to ensure that the base of the multi-stage pump is stable and vertical.
2. Check the connection of each pipeline: confirm whether each interface is tightly connected and whether there are abnormal conditions such as abnormal noise.
3. Pump movement test: turn on the power, check whether the motor rotation is stable, whether the sound is normal, whether the pump is leaking, etc.
4. System pressure test: In the experiment, the intelligent instrument records data such as the opening and closing state of the control valve and the water flow. During the test, pay attention to whether there are abnormal conditions such as noise, vibration or high temperature around the system, and deal with any abnormalities in time.
5. Check the wires: Confirm whether the wires are correctly wired and free of damage and other relevant details meet the installation specifications.
The above is a detailed explanation of the installation steps of the multi-stage pump. I hope readers can install the multi-stage pump correctly according to the above steps to ensure that the installed multi-stage pump can operate normally and provide better protection for production and life.
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Fault one: multi-stage pump does not absorb water pressure gauge and vacuum gauge pointer beating violently
Cause: 1. Insufficient water injection and diversion 2. Air leakage at the connection between pipeline and instrument 3. Excessive suction
Solution: 1. Check whether the bottom valve leaks. 3. Lower the suction height
Fault two: multi-stage pump does not absorb water vacuum table indicates a high degree of vacuum
Reason: 1. The bottom valve is not opened or blocked 2. The resistance of the suction pipeline is too large 3. The filter is blocked
Solution: 1. Check the bottom valve 2. Replace the water absorption 3. Clean the filter
Fault three: pressure gauge pressure but still not out of water
Reason: 1. The resistance of the outlet pipe is too large 2. The rotation direction is wrong 3. The outlet pipe valve is not open 4. The impeller is blocked
Solution: 1. Check or short water pipe 2. Check the motor. Two-phase intermodulation 3. Open the outlet valve 4. Remove the dirt in the impeller
Fault four: can not reach the design flow
Reason: 1. air inhalation 2. due to the lowering of the water level. The submerged depth is not enough. 3. The impeller is blocked by foreign matter. 4. The rotor is severely worn.
Solution: 1. Check the air leakage site and exclude 2. Extend the suction pipe. Deepen the flooding depth 3. Remove and remove foreign objects 4. Replace the sealing ring
Fault five: multi-stage pump power consumption is too large
Reason: 1. Packing is too tight. And heat 2. The flow is too large 3. The rotating body and the shell rub 4. The pump bearing is worn 5. The pump shaft is bent.
Solution: 1. Relax the packing pressure appropriately 2. Close the gate valve opening 3. Trim the position of the rotary body and the shell 4. Replace the bearing 5. Replace or correct
Fault six: multi-stage pump vibration increased
Reason: 1. The impeller is partially blocked 2. The impeller is damaged 3. The flow rate is too small 4. The pump shaft is not concentric with the motor 5. The bearing is damaged 6. Air is mixed. Cavitation occurs
Solution: 1. Disassemble and remove foreign matter 2. Replace the impeller 3. Slightly open the outlet valve 4. Point aligning 5. Change the suction position. Improved water absorption
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Hunan Sanchang Pump Co., Ltd.
| Email: | sales@sanchangpump.com |
| Hotline: | +86 133 0748 1676 |
| +86 193 1300 1794 | |
| Mobile/wechat: | +86 133 0748 1676 |
| +86 193 1300 1794 | |
| Address: | No.517,Xiangfu Road, Yuhua |
| District, Changsha City | |
| Hunan Province, P.R.C |
