What is an inline pump?

Centrifugal pumps are the most widely used pumps in the world. Although most centrifugal pumps are horizontal, we also use vertical inline pumps in some space-constrained applications (the space occupied by the vertical installation solution is 1/3 - 1/2 for horizontal installation). Vertical in-line centrifugal pumps, as the name suggests, are single-stage centrifugal pumps designed for vertical installations, its suction and discharge connections are in a straight line. Vertical centrifugal pumps are often used to transport clean water and other liquids that are physically and chemically similar to clean water.

inline pumps
inline pumps

Main components and materials of the in-line pump

Pump casingCast Iron; Ductile Iron; Cast Steel; SS304 316 316L; Bronze
ImpellerCast Iron; Ductile Iron; Cast Steel; SS304 316 316L; Bronze
ShaftCarbon Steel; Chrome Steel; Stainless Steel; Stainless Steel 316
SealMechanical seal
Flange standardANSI
PowerFor electric drive only

How to choose the right pump material for my application

  1. Mainly check the compatibility of the material of the pump flow parts (pump casing, impeller, O-ring and mechanical seal) with the pumped fluid.
  2. When a variety of materials are suitable, consider the material with the most comprehensive cost and the lowest cost

Why choose an inline centrifugal pump?

  1. Compact structure and small size, which minimizes space and piping requirements
  2. Easy to install. Since the inlet and outlet are the same size and are also on the same central line, the pump can be installed directly on any part of the pipeline, just like a valve.
  3. Easy to maintain. No need to dismantle piping for inspection and maintenance
  4. More suitable for higher temperature, higher pressure products due to its ability to handle thermal expansion


Vertical inline pumps are suitable for a wide range of industrial applications (plants, mining, fire fighting, water supply, water treatment, pressurization, building systems, air conditioning systems (HVAC)) and marine applications (ballast transfer, seawater general service, scrubber systems, ships), the most important of which are water circulation and water heating. Vertical inline pumps are best suited for the circulation of hot water, as they can withstand extreme temperatures.

Key Considerations When Selecting an Inline Pump

The number of stages: There are two common in-line centrifugal pumps, one is a single-stage in-line centrifugal pump and the other is a multi-stage in-line centrifugal pump. Multistage pumps are better for fluid pressurization, while single-stage pumps are ideal for low-pressure applications

multi-stage in-line centrifugal pump

Flow rate: Flow rate is the volume of liquid that passes through a pump in a given time period. This is one of the most important things to consider when choosing an inline pump

Head: The term head is used instead of pressure in the centrifugal pump business. The maximum height at which the fluid can be pressurized

Horsepower: A commonly used unit for measuring power. The pump must have sufficient power to achieve the required flow and head

Flange: The end flanges of the pump must fit and align perfectly with the piping for full pump operation

Overall costs: Designed to help you maximize efficiency and reduction in total operating costs

Need help selecting the right inline pumps for your application?
Contact us at anpump5@angroupcn.com or +86 15032857866;
Our technical sales engineers have extensive product knowledge and will be able to help you.

Related Products

Sea water pump overview

The sea water pump or seawater pump is a centrifugal pump for conveying or circulating cooling sea water or salt water, also called salt water pump, cooling pump, or circulating pump, made of sea water resistant material.

Seawater pump material

Seawater is corrosive, in order to resist the corrosion of seawater. Seawater pumps are mainly made of seawater-resistant materials, usually stainless steel, bronze (an alloy based on copper and tin), or other corrosion-resistant materials.
Under normal circumstances, the shell, pump cover, and impeller of the seawater pump are all bronze or stainless steel, and the pump shaft is made of stainless steel. Bronze is a cost-effective alternative, as seawater pumps made of stainless steel are generally more expensive. Sometimes, to save cost, the pump casing and cover can be made of cast iron.

How does the booster pump work?

The basic component of the seawater pump is the impeller. The seawater pump follows the working principle of the traditional centrifugal pump. The impeller is connected to the motor or diesel engine through the drive shaft and rotates at high speed. The seawater enters the impeller's eye, and the rotating motion of the impeller makes the seawater pressurize and accelerate through the impeller blades. Under the action of centrifugal force, it is discharged into the pump casing along its circumference. There are two styles of pump casings for directing pressurized water out of the pump: volute and diffuser. The diffuser design is more efficient, while the volute design is better for channeling seawater containing solids

Sea water pump application
A seawater pump is a device that transfers or circulates salt water and has a wide range of uses.

  1. Used in water cooling system to circulate sea water inside the machine, cooling equipment to maintain efficiency
  2. Desalination, which is the process of removing minerals and salts from seawater
  3. As a marine pump, bilge dewatering, high-pressure deck cleaning, fire fighting

Common seawater pumps made by An Pump Machinery

Bronze in-line seawater pump


Bronze split case sea water pump

Stainless steel multistage sea water pump

Need help selecting the right seawater pumps for your application?
Contact us at anpump5@angroupcn.com or +86 15032857866;
Our technical sales engineers have the extensive product knowledge and will be able to help you.

Like most other machines, slurry pumps require regular maintenance to function properly. Without proper maintenance, centrifugal slurry pumps are likely to fail, leading to unplanned repairs and ultimately higher total operating costs. Is your mining slurry pump in good condition? I often go to the customer site and see various situations. I have some experience in pump maintenance. I will share it with you today, hoping to help you.

mining slurry pump

01 Keep the centrifugal slurry pump clean, dry, and free of oil and leaks.

02 Check the oil, but only if the pump is not running

Many pumps require oil to lubricate them you need to check to make sure there is no water in the oil. Water can cause motor or bearing failure. Sometimes the seal will leak, so a small amount of water is fine. However, if the oil is milky, it means there is too much water. Regular oil changes will extend the life of the pump if your seals work properly

03 Check the belt

If your slurry pump is belt driven, check the tension at least quarterly. A belt that is too tight can cause damage to the motor bearing temperature, and a belt that is too loose can cause performance degradation and slippage, which can cause damage to the pulleys

04 Check bearings for sudden spikes or drops in temperature.

Our horizontal and cantilever pumps require weekly bearing temperature checks while the pump is running. Use a thermometer to check the temperature of the housing closest to the bearing. Bearing temperature can be a sign of excessive lubrication or the beginning of bearing failure

05 Check impeller clearance

Check the impeller clearance for optimum performance, and watch out for excessive wear on the impeller and other wetted parts. Wear on wetted parts can lead to increased clearances, resulting in reduced performance.

06 Check the stuffing box and adjust as needed.

07 Check that the pressure and flow of the shaft seal water and cooling water are appropriate

08 Check whether there is abnormal sound, vibration or leakage during pump operation, and deal with the problem in time

09 Check that the pump and motor are aligned

Need help with Technical Support about mining slurry pump
Contact us at anpump5@angroupcn.com or +86 15032857866;
Our technical sales engineers have the extensive product knowledge and will be able to help you.

Also see

Safety Precautions for Using Slurry Pumps

What is a booster pump?

A booster pump is a centrifugal pump that increases low water pressure and flow. It is mainly used to increase the pressure of water or other fluid flow systems to maintain water pressure in areas with low or fluctuating water pressure. The booster pump is also called a pressure pump. Usually, the booster pump is used in the water delivery system, and the water can easily reach the required height by installing the booster pump. The most common application is the water delivery of high-rise buildings.

How does the booster pump work?

The booster pump follows the traditional centrifugal pump working principle, the impeller is connected to the motor or diesel engine through the drive shaft and rotates at high speed. The fluid enters the impeller eye, and the rotational motion of the impeller accelerates the fluid through the impeller blades and is discharged into the pump casing by centrifugal force along its circumference. The action of the impeller increases the velocity and pressure of the fluid and leads it to the pump outlet.

Main components of the booster pump

Volute casing
The main goal of the volute is to convert the velocity of the fluid into pressure, thereby increasing its pressure

The impeller is the core part of the booster pump, it has high speed and high output, the impeller on the blade and plays a major role, the impeller should pass the static balance test before assembly. The inner and outer surfaces on the impeller are required to be smooth to reduce the friction loss of water flow. With the help of centrifugal force, this impeller rotates the water axially and radially.

Inlet and Outlet Valves
Water is drawn into the pump through the intake valve. On the other hand, the outlet valve is used to release the water under pressure.

Common booster pump classification

Depending on the application, many types of pumps can be used as booster pumps. Fluid is drawn into the pump and the fluid pressure builds up through the impeller and diffuser housing to deliver the fluid to the desired height

Horizontal Multistage Centrifugal Pump
Used to increase the pressure of liquids that are already flowing

Horizontal Multistage Centrifugal Pump

Vertical Multistage Centrifugal Pump
Centrifugal pumps with multiple impellers, which can be used in series for lower volume flow at high pressures

Vertical Multistage Centrifugal Pump

End suction centrifugal pump
Highly configurable pumps that can be used in parallel

End suction centrifugal pump

In-line centrifugal pump or Pipeline centrifugal pump
Simple structure and smaller installation space for in-line boosting

In-line centrifugal pump


Steel industry
Reverse osmosis
High-pressure spray cleaning system
Municipal Pressure Maintenance
Boiler feed water
Home utility water supply
Fire fighting

How to improve the efficiency of the water booster pump?

Save energy and improve efficiency by connecting a booster pump to a variable frequency drive (VFD) for speed control
VFD can also be used to start a water booster pump and avoid inrush currents, which are typically 5 to 8 times the rated current. Such surges can create unexpected voltage drops that, without a soft-start mechanism, can damage sensitive electronics
When the VFD is connected to the booster pump, you can modify operation in real-time based on building and water supply conditions to maximize energy efficiency. Electronically commutated motors provide optimum energy savings while also providing integrated speed control for low-power applications.

Need help selecting the right booster pumps for your application?
Contact us at anpump5@angroupcn.com or +86 15032857866;
Our technical sales engineers have the extensive product knowledge and will be able to help you.

The main difference between a mixed flow pump and an axial flow pump is that the liquid flows in different directions after passing through the impeller.
The mixed-flow pump is a combination of both axial and radial directions that forms an included angle with the center of rotation of the impeller.
Axial flow pumps keep axial flow parallel to the center of rotation of the impeller


A mixed flow pump is a centrifugal pump with a mixed flow impeller.

heavy duty pump

An axial flow pump is a large diesel or electric motor-driven impeller pump with a propeller. The pressure in the axial flow pump is created by the flow of liquid over the impeller blades, capable of moving large amounts of water at a relatively low head.


The performance characteristics of the axial flow pump are different from that of the mixed flow pump. The zero flow head of the axial flow pump can be three times the head of the pump at the optimum efficiency point. The power increases as the flow decreases, and the power consumption is the largest when it is turned off. This is in contrast to mixed-flow pumps, which require more power as flow increases
The axial flow pump can adjust the flow and head by changing the pitch of the impeller blades

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