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| Email: | info@sanchangpump.net |
| Hotline： | +86 181 4266 2779 |
| +86 193 1300 1794 | |
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+86 181 4266 2779 |
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+86 181 4266 2779 |
| Address： | No.517,Xiangfu Road |
| Yuhua District, | |
| Changsha City | |
| Hunan Province, P.R.C |
HW Type Horizontal Mixed-flow Pump
Classification:
Other Pump
Petrochemical
Urban Water Supply
Key words:
Mixed-flow Pump
Horizontal Centrifugal Pump
Emergency Pump
Hotline:
- Product Description
- Performance Parameters
- Installation Drawings
- Installation and Operation
- Faults and Solutions
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- Commodity name: HW Type Horizontal Mixed-flow Pump
Flow Range: 90-3665 m3/h</br> Head Range: 3.5-22 m</br> Matched power: 3-250 kw</br></br></br></br></br></br></br></br>
Product Description
HW type mixed flow pump is horizontal mixed flow pump. It is suitable for transporting clean water and river water, with the liquid temperature not exceeding 50℃. It is widely used for farmland irrigation and drainage, as well as industrial and municipal water supply and drainage.
Overview
In terms of flow rate and head, Model HW mixed flow pump performs between centrifugal pumps and axial flow pumps. It boasts compact size, light weight, simple structure, easy operation and convenient maintenance. Designed for conveying clean water or water-like media, it is well applied to farmland irrigation & drainage and industrial water supply & drainage.
Structure Description
1. Features: Simple structure, easy installation and dismantling, high efficiency, small overall dimension and light weight.
2. Transmission Types: Direct drive and variable speed drive. Electric motors and diesel engines are the common prime movers. When placing orders, please indicate the model, rated power and rotating speed of the prime mover to confirm the specifications of couplings and pulleys.
3. Rotation Direction: Viewed from the pump inlet, the impeller normally rotates counterclockwise.
Application
It is applicable to conveying clean water and other liquids with physical and chemical properties similar to water, covering farmland irrigation and drainage, industrial and municipal water supply and drainage and other scenarios.
Model Description
Example: 300HW-7S
300 -- Pump inlet and outlet diameter (mm)
HW -- Volute mixed flow pump
7 -- Head (m)
S -- Structural type: split casing with front and rear access covers
The standard HW-S series pumps are designed, manufactured and inspected in compliance with GB/T13008 and JB/T6667.
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Flow Range: 90-3665 m3/h
Head Range: 3.5-22 m
Matched power: 3-250 kw
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Commissioning
After installation, the mixed flow pump shall be put into trial operation to verify the rotation direction and rectify installation faults.
Start-up Procedure
1. Close the outlet gate valve and check valve.
2. Pump priming: Add water through the threaded hole on the top of pump casing. Alternatively, open the check valve to allow backflow from the discharge tank for priming, or adopt a vacuum pump for air suction priming. Once air is exhausted and water flows out, start the pump and shut down the vacuum pump.
3. After the prime mover runs at rated speed, fully open the gate valve and adjust the tightness of packing. Continuous operation is allowed if the pump runs steadily, bearing temperature is normal and vibration is slight. If a check valve is equipped, lift the valve disc after water discharge to reduce flow resistance.
Operation and Maintenance
1. For oil-lubricated bearings, keep the oil level between the two marks on the oil level gauge at all times. For grease-lubricated bearings, replenish grease regularly. For Model 100\350 HW pumps, remove the front and rear covers for refilling; for Model 400\650 HW pumps, add grease via the grease cup.
2. Check bearing temperature rise regularly. The temperature rise shall not exceed 40℃ above ambient temperature, and the maximum operating temperature shall not exceed 80℃.
3. Listen for friction or knocking noise during operation. If friction occurs between the pump cover and impeller, fit paper gaskets between them. The operating clearance shall be maintained at 0.3 ~ 0.7 mm.
4. Adjust the packing to proper tightness. Liquid shall drip intermittently from the packing gland. Over-tight packing will cause shaft overheating and higher power consumption; over-loose packing will lead to excessive leakage and lower operating efficiency.
5. For direct-coupled motor and pump units, ensure precise shaft alignment.
6. Inspect the suction pipeline for air leakage regularly.
7. Monitor for abrupt fluctuation of power and sharp drop of flow rate. Stop the pump immediately for troubleshooting if any abnormality occurs.
8. Check all bolts periodically to prevent loosening caused by vibration.
9. In winter, drain all residual water inside the pump and pipelines after shutdown.
10. Replace lubricating oil or grease after the initial 200 operating hours or six months of service. Afterwards, replace lubricants every 1000 operating hours or every 12 months.
11. Dismantle, inspect and maintain the pump after 3000 operating hours or three years of service.
12. For long-term idle pumps, disassemble the rotating parts, apply anti-rust treatment and store them properly.
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Overheating of Drive Shaft and Motor Bearings
This fault is mainly caused by insufficient lubricant or damaged bearings. It can be resolved by refilling lubricant or replacing the bearings.
No Water Discharge
Three main causes: the pump casing and suction pipe are not fully primed; the dynamic water level is below the strainer pipe; the suction pipe is cracked.
Solutions: Rectify faults of the foot valve and complete priming; lower the pump to submerge the strainer pipe, or resume pumping after the water level rises above the strainer; repair or replace the defective suction pipe.
Excessive Power Consumption, Severe Vibration and Abnormal Noise
Causes of excessive power consumption: excessive pump speed, bent pump shaft, misaligned or non-parallel shafts between pump and motor, improperly selected pump head, sediment or foreign blockages inside the pump, and damaged motor ball bearings.
Causes of severe vibration and abnormal noise: unstable installation or excessively high mounting position of the pump, damaged motor ball bearings, bent pump shaft, as well as misaligned or non-parallel shafts of pump and motor.
Solutions: Fix the pump firmly or reduce its mounting height; replace faulty motor ball bearings; straighten the bent pump shaft or realign the pump and motor shafts.
Insufficient Flow Rate
Main causes: Air leakage from the suction pipe or foot valve; blocked pump inlet; insufficient submergence depth of the foot valve; low pump speed; severe wear of wear rings or impeller; suction lift exceeding the allowable limit.
Solutions: Inspect the suction pipe and foot valve to eliminate air leakage; clear sludge and blockages at the pump inlet; ensure the submergence depth of the foot valve is no less than 1.5 times the diameter of the suction pipe and increase the depth if necessary; check power supply voltage to raise pump speed, and replace worn wear rings or impeller; lower the pump installation position or replace it with a mixed flow pump of higher head.
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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 |
