NL/NLA Vertical Slurry Sewage Pump, Single-Stage

Model Code Explanation

Product Introduction

NL vertical slurry sewage pump is a single-stage, single-suction vertical centrifugal pump. Its main components include volute casing, impeller, pump base, pump casing, support tube, motor seat and motor.
The volute, pump base, motor seat and impeller nut are made of cast iron with good corrosion resistance and easy processing.
The impeller adopts a three-blade curved design and uses a semi-open structure made of malleable cast iron, providing high strength, good corrosion resistance, easy machining, excellent passing ability and high efficiency.
To reduce weight and machining volume, the pump shaft is made of high-quality cold-drawn carbon steel round bar. Four oil seals and a shaft sleeve are installed inside the pump base to prevent shaft wear and extend service life.
The NL slurry pump can be installed vertically or at an incline. It occupies a small floor area. The volute must be submerged in the working medium during operation, allowing easy startup without the need for priming. The pump rotates clockwise when viewed from the motor tail end.
Multiple overall lengths are available so users can select the appropriate specification based on application needs.

Product Applications

1. In rural areas, the NL vertical slurry pump is mainly used for pumping river silt, manure, river water, slurry feed, irrigation, flood drainage and drought resistance. It can replace manual transport, assist in silt removal, fertilizer preparation, act as a simple mobile fire pump, or be used in fish farming for pond cleaning and oxygenation.
2. The slurry pump produced by our factory can be used in municipal, chemical, dyeing, pharmaceutical, shipbuilding, casting, food and other industries for pumping viscous liquids, dirty liquids, slurry, quicksand and flowing sludge in urban waterways. It can also be used in coal mines for transferring fluids containing silt and small gravel.
3. When used together with a high-pressure pump and water jet, it can form a hydraulic mechanized earthwork unit for land leveling, river and pond dredging, trenching, and other small-scale civil and water conservancy projects.

Operating Conditions

1. The NL vertical slurry pump is a single-stage, single-suction centrifugal pump suitable for industries such as mining, papermaking, dyeing, environmental protection, graphite, mica, gold, ceramics, oil refining, petroleum, chemical, farms, salt mines, iodine plants, dyeing, brewing, food, fertilizer, coking plants, construction, marble plants, gold mines, sludge, quicksand, slurry ponds, sewage ponds and other fields for transferring thick slurry, viscous liquids, materials with suspended solids, and sewage. It can also be used in coal mines for pumping fluids containing lumps of mud.
2. When combined with a high-pressure pump and water gun, it can form a hydraulic mechanized earthwork system used for land leveling, dredging of rivers and ponds, excavation of small civil-defense or underground projects, and similar tasks.
3. It can be used in fish farming for pond cleaning, oxygenation, and similar applications.

Usage Precautions

1. The pump must use a three-phase four-wire power supply. If no grounding wire is available, one must be added to prevent electric leakage. A fuse and switch matching the motor rating must be installed nearby to prevent motor damage if the impeller is jammed by debris.
2. The pump can operate without any foundation; it only needs to be placed securely at an angle. If necessary, tie it with a rope to prevent accidents. After starting, check the motor rotation direction—it must not run in reverse for more than one minute.
3. If the pumped liquid contains weeds, wires, wood pieces, bricks or similar debris, they must be removed beforehand. A wire mesh basket may be used to prevent debris from entering the pump, which could cause impeller damage, jamming or pipeline blockage.
4. After pumping mud or dirty liquid, the pump should run briefly with clean water to rinse the casing and pipelines.
5. When operating outdoors, the motor should be covered to prevent rainwater from entering.
6. When pumping mud from riverbeds or ponds, the pump should be hung on a tripod, or placed on a floating platform or boat for mobile operation. When used with a high-pressure water gun during earthwork, the diameter of broken soil blocks must not exceed one-third of the pump inlet diameter.
7. The rated speed of the NL slurry pump must not be arbitrarily increased; reduced speed use is allowed but efficiency will decrease accordingly.
8. When pumping thick slurry, viscous liquids, or when operating at high head or long-distance transport, the load will decrease. Do not attempt to increase load by modifying the pump structure.
9. After approximately 1250 hours of operation, routine maintenance must be performed: disassemble the pump base, inspect bearings and seals, clean and replace grease, and replace oil seals, shaft sleeves and other parts if necessary. (For pumps using mechanical seals, maintenance should be carried out after approximately 3500 hours.)
10. When the pump is not used for an extended period, the volute should be removed, all parts cleaned and dried, and the mating surfaces coated with light oil. Store the pump in a dry location for future use.

Structure Diagram

Performance Parameters