NL/NLA Vertical Mud Pump – Single Stage Centrifugal Slurry Pump

NL/NLA Vertical Mud Pump – Single Stage Centrifugal Slurry Pump

NL/NLA Vertical Mud Pump | Sump-duty slurry transfer

  • Sump slurry duty: Abrasive solids handling.
  • Vertical cantilever: Priming-free operation.
  • Wear-resistant wet end: Replaceable wear parts.
  • Easy service: Pull-out maintenance.
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Product Overview

The NL Vertical Slurry Pump is a single-stage, single-suction vertical centrifugal pump, designed for handling slurry containing mud, sand, and suspended solids. The pump features a compact structure, small installation footprint, and can operate in both vertical and inclined positions. It is designed for stable operation and is highly adaptable to complex media.

Model DesignationNLNLA Vertical Mud Pump – Single Stage Centrifugal Slurry Pump type

Key Features

  • Powerful Solid Handling Capability: The semi-open three-blade single-arc impeller design offers excellent delivery capability and operational efficiency.

  • Abrasion-Resistant Material: Main cast iron components provide excellent corrosion resistance and machinability, ensuring long pump life.

  • Optimized Shaft System Design: Reduces shaft wear and extends service life, ensuring long-term stable operation.

  • Compact Vertical Structure: The pump occupies minimal space, making it suitable for various installation conditions.

Engineering Overview

The NL series pumps adopt a vertical layout and offer multiple overall length configurations. These can be flexibly chosen based on site conditions and application requirements. During operation, the pump casing must be immersed in the working medium for easy startup, with no priming required, and it is suitable for continuous operation.

Typical Applications

The NL vertical slurry pump is widely used in rural and urban applications, including:

  • River Dredging, Pond Sludge, and Manure Transport: For irrigation, drainage, drought control, and river cleaning.

  • Industrial Applications: Handling high-viscosity liquids, murky liquids, slurries, and slurry containing small stones.

  • Hydraulic Soil Flow Systems: When combined with high-pressure pumps and hydraulic injectors, it is used for land leveling, dredging, and hydraulic transport operations.

System Configuration

Pump Components

The NL vertical slurry pump primarily includes the discharge box, impeller, pump base, pump casing, support pipe, motor base, and motor. The discharge housing, pump base, motor base, and impeller nut are all made of cast iron, providing balanced structural strength and corrosion resistance. The impeller features a semi-open design made from castable iron.

Components and Supply

The NL series pumps offer flexible component configurations, including different impeller types and materials, such as cast iron or stainless steel, to meet various operational conditions and provide reliable performance.

Technical Service

NL series pumps provide comprehensive technical support, including installation, commissioning, regular maintenance, and troubleshooting, ensuring long-term stable operation of the equipment.

Operating Conditions

  • Applicable Media: Suitable for transporting slurries, quicksand, vacuum media, murky liquids, dense slurries, and liquids with suspended solids.

  • Typical Application Areas: Mining, papermaking, dyeing and printing, environmental protection, graphite and mica processing, chemical plants, farms, salt and iodine fields, fertilizer plants, mineral processing facilities, construction sites, and coal mine drainage involving slurry liquids.

Service Conditions

Regular inspection of the pump’s sealing system, impeller, and bearing assembly is recommended to ensure efficient and safe operation and extend the pump’s service life.

Protection Features

The NL vertical slurry pump is equipped with multiple protection features, including overcurrent protection, temperature monitoring, and liquid level protection systems, ensuring the pump stops operating in abnormal conditions to prevent equipment damage.

Selection Standards

When selecting the pump model, consider factors such as the temperature of the media, pH value, solid particle size, and the required flow and head of the pump to ensure the selection of the most suitable configuration.

Specifications & Installation

Outline Drawing

NL/NLA Vertical Slurry Pump Structure DiagramPerformance Data

No.
Part name / type
No.
Part name / type
No.
Part name / type
1
Strainer
9
Discharge elbow
17
Support tube
2
Impeller nut
10
Pump shaft
18
Bearing cover
3
Impeller
11
Bearing
19
Driven coupling
4
Pump casing
12
Driven coupling
20
Motor base
5
Pump seat
13
Driving coupling
21
Motor bracket C
6
O-ring
14
Connecting tube
22
Driving coupling
7
Oil seal
15
Bearing housing
23
Electric motor
8
Shaft sleeve
16
Coupling shaft
24
Elastic block

Performance Parameters

Model
Speed n
r/min
Flow Q
m³/h
Head H
m
Efficiency η
%
Motor power
kW
Overall pump length
mm
Unit weight
kg
NL50-8
NL50A-8
1450
20–30
8–9
42
1.5
1310
63
NL50-12
NL50A-12
1450
25–38
12–14
41
3
1310
80
NL50-24
NL50A-24
1450
25–38
20–24
41
5.5
1430
152
NL65-16
NL65A-16
1450
50–60
15–18
42
5.5
1430
152
NL65-25
NL65A-25
1450
50–60
20–25
42
11
1510
265
NL76-9
NL76A-9
1450
50–70
9–10
42
3
1350
90
NL76-16
NL76A-16
1450
50–70
14–16
42
5.5
1430
152
NL76-20
NL76A-20
1450
50–70
18–20
42
7.5
1430
155
NL80-8
NL80A-8
1450
60–70
7–9
56
4
1400
120
NL80-12
NL80A-12
1450
80–120
11–13
56
7.5
1430
145
NL80-25
NL80A-25
1450
80–100
25
56
11
1550
270
NL100-7
NL100A-7
1450
70–80
6–8
61
4
1430
130
NL100-10
NL100A-10
1450
100
10
61
7.5
1450
160
NL100-16
NL100A-16
1450
80–100
15–17
61
15
1510
270
NL100-25
NL100A-25
1450
80–100
20–25
61
18.5
1690
350
NL150-12
NL150A-12
1450
100–150
11–13
66
18.5
1690
350
NL150-16
NL150A-16
1450
120–180
15–20
68
22
1690
370

Operating Manual

Operating Notes

  1. Power Supply: The pump must use a three-phase, four-wire power system. If no ground wire is available, one must be added to prevent electric leakage. During operation, a circuit fuse and switch matching the motor must be installed nearby to prevent motor burnout in case the impeller is jammed by foreign materials.

  2. Pump Installation: The pump can operate without a fixed foundation; it can simply lean securely against a firm support. If necessary, tie it with a rope to prevent accidents. After starting, check the motor rotation direction. Reverse rotation must not exceed one minute.

  3. Handling of Pumped Liquid: When the pumped liquid contains a large amount of weeds, iron wire, wooden strips, bricks, and other debris, these should be removed as much as possible in advance. A wire basket or similar device can be installed to prevent debris from entering the pump, which could cause impeller damage, seizing, or pipeline blockage.

  4. Cleaning After Mud Transport: After pumping mud or other turbid media, allow the pump to run briefly with clean water to flush the pump body and pipeline.

  5. Outdoor Operations: When operating outdoors, a protective cover should be installed on the motor to prevent rainwater ingress.

  6. Mobile Operation: When pumping sludge from riverbeds or pond bottoms, the pump can be suspended on a tripod or placed on a floating pontoon or boat for mobile operations. During earthwork operations, the soil blocks broken up by a high-pressure water gun must have a maximum diameter no greater than one-third of the suction inlet diameter.

  7. Pump Speed: The rated speed specified for the NL slurry pump is its maximum allowable speed and must not be arbitrarily increased. Although reducing the speed is not restricted, it will noticeably reduce efficiency.

  8. Handling Viscous Liquids: When the pump is used to handle thick mud, highly viscous liquids, or for high-head and long-distance slurry transport, the load conditions will change. However, the load must not be increased by altering the pump structure.

  9. Regular Maintenance: After about 1,250 hours of operation, the pump should undergo regular maintenance. Disassemble the pump seat to check the bearings and seals, clean and replace grease, and replace oil seals, shaft sleeves, and other parts if necessary. For pumps with mechanical seals, perform regular maintenance after approximately 3,500 hours of operation. For details on maintenance and parts replacement, refer to the installation instructions.

  10. Long-Term Shutdown: If the pump is to be out of service for a long period, remove the volute casing, wipe all parts dry, apply a thin layer of oil to all sliding and mating surfaces, and store the pump in a dry place for future use.

Disassembly &Installation

I. Disassembly

  1. Remove the motor or mounting plate and the discharge pipe.

  2. Remove the volute casing and impeller nut, gently pry behind the impeller and remove it together with the key.

  3. Remove the driven half-coupling, then remove the key. After that, remove the motor base and separate it from the support tube.

  4. Remove the bolts connecting the pump seat and support tube, and separate them.

  5. Remove the shaft sleeve and bearings from the shaft.

II. Installation

  1. Inspect all parts to ensure there is no damage. Apply a thin layer of grease to both sides of all paper gaskets, and fill the bearings with grease to about two-thirds of their volume.

  2. Fill the framework oil seals fully with grease before installing them into the pump seat, then install the bearings.

  3. After installing the O-ring into the shaft sleeve, coat it with grease.

  4. Install the bearings into the motor base, place the paper gasket and oil deflector ring, then assemble the shaft and support tube and fix them with screws.

  5. Install the paper gasket, then mount the bearing, shaft sleeve, key, pump seat, and impeller. Tighten the impeller nut, then turn the impeller by hand. It should rotate smoothly and freely.

  6. Install the paper gasket and mount the pump casing, fixing it with screws, then install the strainer. Turn the impeller by hand again; it should still rotate freely.

  7. Install the key and driven coupling on the pump shaft, and the key and driving coupling on the motor shaft. Then fasten the motor to the motor base with bolts. After installation, the axial clearance between the driving and driven couplings must be 1–1.5 mm.

OEM & Custom

Chaodun Pump provides OEM and ODM customization for global distributors. Options include material customization (cast iron, stainless steel), branding, and design modifications. We support international trade, sample orders, and full logistics assistance for export clients.

FAQs

  1. 1. What industries use NL/NLA mud pumps?
    They are widely applied in agriculture, mining, chemical, and municipal sewage systems.
  2. 2. Can this pump be installed vertically or inclined?
    Yes, the NL/NLA pump can operate both vertically and at an angle depending on installation needs.
  3. 3. What is the maximum particle size it can handle?
    It can handle small solids, mud, and sand typically found in industrial and agricultural environments.
  4. 4. Is it suitable for river dredging or pond cleaning?
    Yes, it can be mounted on floating platforms for dredging and sludge removal.
  5. 5. What materials are available for construction?
    Standard models are made of cast iron; stainless steel options are available for corrosive media.
  6. 6. What are the power range and efficiency?
    Power ranges from 1.5kW to 22kW with efficiencies up to 68%.
  7. 7. Does  Chaodun Pump offer OEM customization?
    Yes, full OEM branding and custom engineering support are available for export clients.