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| Hunan Province, P.R.C |
MDP Wear-resistant Self-balancing Multistage Pump for Mining
Classification:
Mining industry
Water conservancy industry
Electric power industry
BB4 Self-balancing Multistage Pump
MDP wear-resistant self-balancing multistage pump for mine
Multi-stage pump for mine
MDP wear-resistant self-balancing multistage pump for mine
Key words:
water pump
Head Range: 50~2000m
Medium Temperature: 0 ℃ ~ 80 ℃
Allowable Inlet Pressure: 0.6MPa
Shaft Seal: packing seal, mechanical seal
Available Materials: 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: MDP Wear-resistant Self-balancing Multistage Pump for Mining
Flow Range: 3.75~1400 m3/h<br>Head Range: 50~2000m<br>Medium Temperature: 0 ℃ ~ 80 ℃<br>Allowable Inlet Pressure: 0.6MPa<br>Shaft Seal: packing seal, mechanical seal<br>Available Materials: HT200, HT250, QT600, ZG, 304, 316, 316L, 317L, 904L, CD4-MCu, etc</br></br></br></br></br>
MDP type self-balancing horizontal multistage centrifugal pump is developed in compliance with API610 standards. It integrates advanced technologies of equivalent overseas products with our company’s decades of R&D experience and adopts high-efficiency hydraulic models recommended by national energy-saving policies to meet diversified market demands and boost technical advancement of high-pressure multistage pumps.Featuring a wide high-efficiency operating range, broad performance coverage and superior NPSH performance, the pump comes with fewer wearing parts and allows easy installation and maintenance. Its operational reliability is greatly enhanced, with trouble-free service life over three times that of conventional multistage pumps, cutting end-users’ maintenance and full-lifecycle costs significantly.
Breaking the structural design of traditional segmental multistage pumps, this high-pressure self-balancing pump eliminates the conventional axial thrust balancing assembly, serving as an ideal replacement for D/DG series pumps fitted with balancing disc or balancing drum structures. Without built-in balancing devices, energy losses from disc friction and balance return flow are eliminated, lifting overall pump efficiency by 5%~14% versus ordinary equivalent multistage pumps. It fundamentally avoids common failures such as balancing disc/seating abrasion and rotor seizure triggered by failed balancing assemblies, greatly extending pump service life. Field operation records over years verify its performance reaches the advanced level of international peer products.
Model Description:
Example: MD280J‑43×8(P)
MD(P) -- High-efficiency energy-saving self-balancing heavy abrasion-resistant multistage pump
280 -- Design flow rate: 280 m³/h
J -- Mechanical seal (no J marking stands for packing seal)
43 -- Single-stage design head: 43 m
8 -- Total impeller stage number: 8 stages
Working Principle:
Driven by an electric motor, the pump shaft rotates and imparts mechanical energy to conveyed fluid. Liquid is continuously drawn from the suction tank, sequentially passing through suction casing, forward impellers, forward diffusers, middle casings, horizontal outlet of discharge casing, transition pipes, secondary suction section, reverse impellers, reverse diffusers and vertical outlet of final discharge casing before being delivered out continuously.
Structural Features:
MDP self-balancing multistage pump is a horizontally split segmental multistage centrifugal pump with single or double suction inlet. Its suction port can be configured vertically upward or horizontally, while the discharge port is arranged vertically upward. Main components include suction casing, middle casings, discharge casing, secondary suction section, forward/reverse diffusers, forward/reverse impellers, pump shaft, throttling & pressure relief assembly, shaft sleeve, bearing housing and transition pipes.
Middle casings are clamped together with suction and discharge casings via high-tensile stay bolts. Metal-to-metal hard sealing coated with molybdenum disulfide grease is applied on all mating sealing surfaces among suction, middle and discharge casings. The rotor assembly consists of forward impellers, throttling pressure relief parts, reverse impellers and shaft sleeves mounted on the main shaft. Bearings adopt fixed-floating grease lubrication configuration: drive end fitted with cylindrical roller bearings and non-drive end with angular contact ball bearings. The pump hydraulic chamber is composed of suction casing, middle casings, discharge casing, secondary suction section, diffusers and transition pipes.
Wear rings and diffuser sleeves are installed between rotating rotor and stationary pump casing for sealing; these consumables shall be replaced promptly once excessive wear deteriorates pump hydraulic performance.
Two shaft sealing options are available: mechanical seal and packing seal. For packing-sealed configuration, packing rings must be correctly positioned with appropriately tightened packing; optimal tightness allows intermittent droplet leakage. All sealing elements are installed inside the seal chamber, which is fed with pressurized service water for water sealing, cooling and lubrication. Replaceable shaft sleeves are equipped at stuffing box to protect the main shaft. Bearing and seal replacement can be completed without detaching pump suction/discharge piping. The pump is directly coupled to prime mover via elastic pin coupling or diaphragm coupling; the pump rotates clockwise when viewed from the drive end of the motor.
Conveying Medium Range:
Applicable for clean water or chemically similar liquids with solid particle content ≤1.5%, maximum particle size ≤1.3 mm and medium temperature ≤105 ℃. By customizing pump material, sealing structure and adding auxiliary cooling system, the pump can also handle hot water up to 225 ℃, oil products, corrosive fluids or abrasive slurry. Available casing materials include HT200 cast iron, QT600 ductile iron, cast steel ZG, stainless steel 304,304L,316L,317L,904L and duplex stainless steel CD4 etc. for customer selection.
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Flow Range: 3.75~1400 m3/h
Head Range: 50~2000m
Medium Temperature: 0 ℃ ~ 80 ℃
Allowable Inlet Pressure: 0.6MPa
Shaft Seal: packing seal, mechanical seal
Available Materials: HT200, HT250, QT600, ZG, 304, 316, 316L, 317L, 904L, CD4-MCu, etc
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Outline Installation Drawing of MDP Wear-resistant Self-balancing Multistage Pump
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Pre-installation Preparation
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.
Installation Procedures
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.
Post-installation Inspection
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: | info@sanchangpump.net |
| Hotline: | +86 181 4266 2779 |
| +86 193 1300 1794 | |
| Mobile/Wechat/WhatsApp: | +86 181 4266 2779 |
| Address: | No.517,Xiangfu Road, Yuhua |
| District, Changsha City | |
| Hunan Province, P.R.C |
