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The pressure head of a single-stage centrifugal pump is considerably adjusted by the impeller type and the circumferential speed. If the rotational speed must be constant due to operating conditions, a larger impeller diameter leads to very low specific speeds and uneconomical efficiencies. So, installing multiple stages in series can be an economical choice to increase the head. If the number of stages is changed at fixed dimensions and speeds, the flow rate of the multistage pump does not alter, but the power input and head increase proportionally to the number of the stages.​

In multi-stage pumps, the fluid flows through multiple impellers installed in series. The fluid enters the first chamber (or stage) under pressure in the suction line and drains at a certain elevated pressure. After leaving the first stage, the fluid enters the second stage, in which the pressure increases again.

Using multi-stage pumps is an economical way to reach higher pressure ranges in the pump series selection diagrams. However, one drawback in using too many stages is the increased sensitivity of the rotor to external or natural vibrations.

An example of a pump with multi-stage casings of the same type arranged in tandem is the ring-section pump. This pump type is usually applied in power stations, such as a boiler feedwater pump, and for industrial purposes that require high pressures.

The distinct stages of a multi-stage centrifugal pump do not necessarily have to be fitted in tandem.  The balancing of axial force can be improved by putting the stages back to back in pairs or groups. A common example is the pipeline pump.

The inlet housing with the axial or radial inlet nozzle is located before the first stage, regardless of the number of stages, and the last stage is positioned in the outlet housing, including the balancing tools and the shaft seal. Only the pump shaft, tie rods, and base plate should be arranged to accommodate the needed number of steps.

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The impeller is mounted inside the pump casing and is attached to the drive motor via gearbox and shaft. The frontal portion of the pump casing is sealed using a suction cover, called the volute that connects directly to the dredge’s suction pipe. As the motor powers the impeller, the impeller spins. Because of specially designed ridges on the impeller, it creates a vacuum suction that draws in the materials and solids. Next, these solids are pushed through the opening to the volute and out the discharge. The separation between the impeller and volute opening limits the size of the solids. Finally, the dredge pump’s discharge is positioned near the top of the dredge pump and is connected to a separate discharge line. This discharge opening identifies the size of the pump.

To generate the power for lifting heavy rocks, sand, and other solids requires a powerful motor and a well-designed pump. Thus, more powerful motors with higher horsepower or kilowatts rotate the impeller faster and force more material higher and farther through the pipelines, allowing for higher heads.  Likewise, this same principle occurs for larger-sized pumps designed to feed more material through at a time.

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Ball mill is the key equipment for crushing materials after they are crushed. It is widely used in cement, silicate products, new building materials, beneficiation of black and non-ferrous metals, glass ceramics and other production industries, and dry or wet grinding of various ores and other grindable materials. The function of the ball mill circulating pump is to make the large particle minerals that do not meet the process requirements into slurry according to a certain proportion, and then return to the feed inlet of the ball mill through the ball mill circulating pump to complete ball milling again until the process requirements are met.

Type selection characteristics of ball mill recirculation pump:

1. As the medium conveyed by the ball mill recirculation pump has large particles, large wear and strong impact, high wear-resistant and impact resistant materials shall be considered for the overflow parts of the pump during model selection;

2. The ball mill recirculation pump are located below the mill, and the maintenance space is limited. Considering the service life, maintenance cycle and spare parts replacement cycle of ball mill recirculation pump, the pump with lower speed shall be selected during model selection, so as to prolong the service life and maintenance cycle of pump overflow parts and reduce maintenance times.

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As the fluid flows through each stage, pressure becomes higher than it was in the previous stage. In multistage pumps, the impellers sometimes differ in design but should always be designed to have nearly identical flow characteristics. An example where the impellers will differ is to avoid significant cavitation in low net positive suction head (NPSH) systems. In this case, or others requiring a pressure boost prior to the subsequent stages, the first stage will be designed for low NPSH operation (such as double suction impeller) and effectively operate while increasing the pressure, prior to entering the subsequent stages.

Industrial applications of multistage centrifugal pumps

Multistage centrifugal pumps are used for a wide variety of industrial applications thanks to their increased efficiency and ability to pump fluids at higher pressures.

• boiler feed water Pumps feed water into a steam boiler.
• firefighting Used to pressurize water to help extinguish fires.
• high-pressure cleaning Creates a powerful stream of water used to clean an object.
• irrigation Used to pump water throughout an irrigation system.
• reverse osmosis Used to remove impurities from water.
• snowmaking Pressurizes water to make snow for use in sports and resorts.
• water circulation Adds pressure to the system to continuously circulate water.
• water supply boosting Increases pressure for water usage.

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1. Expeller drive seal: Use pressure seal produces by impeller and expeller in series, packing or lip sealing ring for shut down seal.

2. Packing seal: The routing sealing systems are suitable for various conditions and can be used in the corrosin or high temperature conditions such as polytetrafluoroethylene packing, graphite packing and etc. It also can be used in strong abrasive condition duty eith shaft ceramic sleeve of sprey weld.

3. Mechanical Seal: World-advanced sealing technique without sealing leakage, integrating construction installation & replacement, various construction suit for all kinds of conditions. High hardness creamic and alloy are adopted for material of friction parts. Design & macting of mechanical seal & sealing box is suitable for fluid state. It possesses high abrasive resistance & shakeproof to guarantee that sealing seffect can be satisfied by customers in various conditions.

Specifications:

Material: High Chrome Alloy A05

Material Chemical Requirements, Weight%

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Technologically improved horizontal froth slurry pumps, which derive from the proven series of horizontal slurry pumps, are being recognised as a significant advancement in the efficient handling of air entrained froth slurries. This innovative new development enables flotation plants to achieve improved froth transfer efficiencies with reduced concentrate spillages, as well as greater froth handling operation windows. There are notable differences between conventional slurry pumps, which are still currently installed on many froth transfer applications, and the next generation horizontal forth pumps. For instance, the horizontal forth pumps features an open vane flow inducer froth pump impeller with a greatly enlarged cover plate pump inlet and matching throat bush liner. However, the volute, frame plate, gland assembly, bearing assembly and the pump base are interchangeable between both the  slurry pump and the horizontal froth slurry pump designs.

Operating Data Pump

Sizes: 2″ to 14″ Capacity: Up to 3000m3/hr Head: Up to 35 meters .

Applications

Froth & viscous slurries in mining, Sugar industry, oil sands, mineral sands, fine tailing, and mineral concentrate.The mining industry is a primary example where pumping operations can be plagued by froth and high viscosity problems. In the liberation of minerals from ore, the minerals are often floated through the use of strong flotation agents. Tough bubbles carry the copper, molybdenum or iron tails to be recovered and further processed. These tough bubbles create havoc with many slurry pumps, often leading to the selection of overly large and inefficient pumps. horizontal froth pumps are small and efficient. The inducer impeller and oversized inlet very effectively enable the froth or viscous slurries to get into the impeller allowing the pump to transport it to the next destination. Low power costs, reliable operation, minimal surging, and feed tank overflow make horizontal froth pumps user friendly.

 Horizontal Froth Pump Key Features:

√ Heavy duty construction with through-bolt design provides ease of maintenance and less down time
√ Ductile iron fully lined casing provides durability, strength and long service life
√ Large diameter, slow turning, high efficiency impellers maximize wear life and lower TOC
√ Large, open internal passages reduce internal velocities maximizing wear life resulting in lower operating costs
√ Unique impeller design for most difficult froth applications
√ Thick elastomer or metal bolt-in liners provide superior corrosion resistance plus offer ease of liner change-out and intermixability to reduce over all maintenance costs and maximize wear life
√ Minimal shaft/impeller overhang reduces shaft deflection and increases packing life
√ Cartridge-style bearing assembly allows for maintenance in a clean environment without removal of the pump, resulting in reliable operation and prolonged bearing life
√ Standard AH can be converted by replacing cover plate, throat bush and impeller
√ Full flush, low flow or dry running centrifugal seals minimize water usage and operating costs

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Multistage Water Pumps can transport water without solid particles or the liquids which the chemical and physical feature are similar with water and temperature ≤ 80℃, It is widely used for delivering water in urban water project,plant water supply, irrigation and mine etc.
Multistage Boiler Water Pumps can transport the clean water without solid particles or the liquids which the chemical and physical feature are similar with water, and the temperature is ≤250℃, It is suitable for delivering boiler feed water for hot water.
Mine Multistage Pumps can transport the neuter minerals water which solid particles percent ≤ 1.5%(Solid dia.≤0.5mm) and ohter similar sewage, the temperature of the liquids are≤80℃. It is suitable for mines, steel works, building industry etc.
Multistage Chemical Pumps can transport the corrosive liquids without solid particles, which temperature is from -20℃ to 150℃, It is suitable for chemical industry, Pharmaceutical industry etc
Multistage Oil Pumpscan transport the oil products without solid grain, viscosity≤120ct, temperature is from -20℃ to 150℃, Inlet pressure of pump is less than 0.6Mpa, It is suitable for petroleum and oil industry etc

Detailed Features:

• Horizontal,single-suction,multistage centrifugal pump design

• Stator- It consists of inlet, middle and outlet sections and the guide vane etc. with the take-up bolt tightly clamping all sections to form a working room. The inlet of it stands horizontally while the outlet vertically upward.

• Rotor – It consists of the shaft, impeller, balancing disk and shaft sleeve etc. The shaft passes the power to the impeller to have it work. The balancing disk balances the axial force, and replaceable shaft sleeve is mounted on both sides of the shaft to protect it.

• Bearings – There are rolling bearing and sliding bearing. The rolling bearing consists of bearing seat, bearing, bearing gland and using grease lubrication. The sliding bearing consists of bearing body, cover, liner, dust-proof disk, oil level, oil throwing ring etc. and using thin oil lubrication.

• Shaft seal – The shaft is sealed with packing and the shaft seal consists of the sealing contents, packing, baffle. the liquid in the sealing work-room fuctions water-sealing, water cooling and water lubricating and the water for water sealing comes from the pressure water inside of the pump, The mechanical seal also can be used as requested.

• Direction – The pump is directly driven by motor through the elastic pin coupling, and viewing from the motor, The pump is clockwise rotation.

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Design Features:

√ Ductile iron fully lined casing provides durability, strength and long service life.

√ Multi-stage high pressure operation to 750 psi.

√ Heavy duty construction with through-bolt design provides ease of maintenance and minimal downtime.

√ Large diameter, slow turning, high efficiency impellers designed to achieve maximum wear life and low operating costs.

√ Large, open internal passages designed to maximize wear life and lower operating costs.

√ Thick elastomer and alloy liners provide superior corrosion resistance and maximum wear life.

√ Full flush gland, low flow, and dry running centrifugal seals reduce flush water usage minimizing pump operating costs.

^Amostech® 8/6S-HH High Head Slurry Pumps Performance Parameters:

^Amostech® 8/6 S HH High Head Slurry Pumps Applications:

HH high head slurry pumps widely used for wet crushers, SAG mill discharge, ball mill discharge, rod mill discharge, Ni acid slurry, coarse sand, coarse tailings, phosphate matrix, minerals concentrate, heavy media, dredging, bottom/fly ash, lime grinding, oil sands, mineral sands, fine tailings, phosphoric acid, coal, flotation, sugar beets, process chemical, pulp and paper, FGD, waste water etc

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Slurry Pump Design Features:

√ Bearing assembly – a large diameter shaft with short overhang minimizes deflection and contributes to long bearing life. Only four through bolts are required to hold the cartridge type housing in the frame.
√ Volute Liners – easily replaceable liners are bolted, not glued, to the casing for positive attachment and east of maintenance. Hard metal liners are completely interchangeable with pressure moulded elastomer.
√ Elastomer seal rings back all liner joints.
√ Pump casing – Casing halves of cast or ductile iron with external reinforcing ribs provide high operating pressure capabilities and an extra measure of safety.
√ Impeller–front and rear shrouds have pump out vanes that reduce recirculation and seal contamination. Hard metal and moulded elastomer impellers are completely interchangeable.
√ Cast in impeller threads require no inserts or nuts. High efficiency and high head designs are also available.
√ Throatbush – wear is reduced and maintenance simplified by the use of tapered mating faces to allow positive accurate alignment during assembly and simple removal.
√ One-piece frame – a very robust one-piece frame cradles the cartridge type bearing and shaft assembly.
√ An external impeller adjustment mechanism is provided below the bearing housing for easy adjustment of impeller clearance.

^Amostech®  Slurry Pumps Applications:

slurry pumps can be used in various of applications, like Minerals processing, Pipeline transport, High velocity hydraulic transport, Coal prep, Cyclone feeds, Aggregate processing, Fine primary mill grinding, Chemical slurry service, Tailings, secondary grinding, Industrial processing, Pulp and paper, Food processing, Cracking operations, Ash handling etc.

According to different working conditions,  slurry pumps can be use as minerals process pump, Booster sand pump, Gypsum slurry pump, Classifying Cyclone Feed Pump, De-watering Screen Pump, Thickener Area Sump Pump, Tailings Pump, Metboom Pump, Feedprep Pump, Scavenger Feed Pump, DMC Feed Pump, Thickener U/F Pump, Re-Cleaner Pump, Ball mill discharge Pump, Ruffer Feed Pump, Fines Area Sump Pump, Transfer to feed prep Pump, Metboom Return Pump, Slime Pond Sump Pump, Thickener Underflow Pump, Thickener Tailings Pump, Thickener Underflow Pump, Magnetite Sump Slurry Pump, Rinse Pump, Dilute Pump, Re-Cleaner Pump, Rougher Feed Pump, Tailings booster Pump, Dilute Medium Slurry Pump, Mill slurry Pump, Mill feed water Pump, Disc filter basin flushing Pump, Correct Medium Slurry Pump, Mixing tank slurry Pump, Centrifuge Effl. Transfer Slurry Pump, Fines Refuse Effl. Transfer Pump, Gas cleaning slurry Pump, Windbox slurry Pump, Pellet hand scrubber slurry pump, Process recycle Pump, Scrubber slurry Pump, Prop pellets undersize Pump, Screen feeder Pump, Furn disch scrubber slurry Pump, BPF Filtrate Effl. Pump, Cosmetic recycle water Pump, Backwash Pump, Venturi scrubber slurry pump, Clarifier underflow pump, Pipeline transfer pump etc.

^Amostech®  Slurry Pumps Performance Parameters:

^Amostech®  Slurry Pumps Outline Dimensions:

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