What is Monoblock Pump : Working and Types

Well, we all know that pumps are the instruments to create a movement in the fluids through some sort of mechanical activity. And depending on the mechanical action, pumps have many classifications like velocity, gravity, steam, and valveless pumps. So, today we are going to have our discussion on one of the specific kinds of the pump and it is  “Monoblock Pump”. This kind of pump also holds various benefits to be implemented in irrigation, construction and agricultural industries. Let’s have a clear look in which category of pumps does this monoblock pump comes under and its working principle.

What is Monoblock Pump?

Definition: A monoblock pump is defined as the device which is a single segment, horizontal and end suction pump equipped either with a partially open or closed impeller. Here, all the revolving parts of the device are fitted on a single shaft. The unique feature which makes this device to be employed is its elimination of losses. It means that there exist three percent and seven percent losses in coupling and belt-driven sets and monoblock pumps hold the capacity to eliminate these losses. Monoblock pump design can be shown as

The components that are in this pump are:

• Gate Valve
• Expander
• Reducer
• Spool piece
• Supporting pipe
• Pipe hangers

Monoblock Pump Pre-Conditioning

In before to the operation of the pump, it has to undergo few preinitiation conditions and those are

• Checking the exact direction of revolution, wiring of starter, and motor edges.
• Proper company guidelines have to be followed
• The device has to be primed either with some liquid or water and an output valve has to be closed

Monoblock Pump Working Principle

Pumps those are with gland packing, the glad nuts have to be tightly fitted. There should be no leakage of liquid or water from the sides of the stuffing box having a flow rate of either 30 or 60 drops per each minute. When there is no leakage, the shaft gets cooled and thus it decreases friction. There has to be replacement of gland packing when this part gets worsened. The required volume of the fluid can be maintained by the correct regulation of the output valve.

The levels of speed, voltage, and current are adjusted based on the pressure gauge value, and also oil level in the bearings has to be examined where it should not be above than that of 60⁰ Celsius. When the oil color becomes so dark, it has to be substituted with fresh oil so that the bearing will function properly. The drive end bearing shield is supplied with six bolts entirely in the pumps beyond 250 mm impeller length. One can observe that three bolts are completely tightened whereas the other three are left loosened. All the six bolts are included in the device just for the adjustment of the impeller’s action.

Furthermore, the pump should be rotated in the same direction as that of an arrow which means in the clockwise direction. At the time of pump rotation, it has to be filled up with any liquid so that it won’t get dried. Dry running might cause the failure of the device.

Types

There are various monoblock pump types based on various parameters such as type of construction, a fluid used and many others. Few of the others to be discussed are as follows:

Centrifugal Monoblock Pumps

These pumps are mostly employed for fresh fluids and water which does not impose any damage to pump equipment. This kind of pump is fuelled up by a complete fenced induction motor that allows a long period to stay. Generally, pumps have many losses, but the monoblock pump has fewer losses because steel coverings protect the motor, and also there will be minimal noise and quivering free functionality. In addition to these benefits, windings that are infused with copper wirings provide increased resistance.

Few of the features in this type are:

• Provides increased discharge value utilizing only less power
• It consists of a running motor and a capacitor initiator
• Chrome coated steel shaft prevents the pump components from rusting
• An impeller is covered to maintain accurate and long-life performance
• Strong motor section
• The device has a strong handle which makes lifting so streamlined
• Voltage instabilities are correctly handled

Uses

This device is mainly implemented in agricultural and gardening purposes and for the industries which work with fresh water. Used for domestic applications in houses, pools, and in extended communities. Also used in automobile service stations, power manufacturing factories, and hospitals.

Jet Monoblock Pump

These pumps are constructed to draw out water from the extensive depths such as from wells and deeper lakes. For effective maintenance, pump components are designed with rustproof steel, gunmetal equipment which is also called cast-iron impellers, a gun metallic assemblage that provides continuous water flow, shielded thermal loads for faultless, accurate and steady output.

Again these are classified as single-stage and double stage jet pumps. In single-stage jet pumps, the discharge head varies in the range of 12, 18, and 27, whereas in double stage jet pumps, the discharge head varies in the range of 15, 22, and 24.

The applications of jet monoblock pumps are domestic purposes, huge buildings, upstairs tanks, hotels, and apartments.

Self-Priming Monoblock Pumps

The versatile features of this kind of pumps are:

• Increased output for 40% of extra flow
• Included with a thermal overload shield where it automatically manages the temperature ranges are ahead of the allowed levels.
• Pumping equipment like impellers, casting parts, and shafts are constructed with increased precision those make sure of enhanced accuracy.
• This monoblock pump holds a strong capacity to endure voltage fluctuations which are in the range of 180 – 250V.

The other types of self-priming types are:

• Mini monoblock
• Slow speed monoblock
• High flow
• Shallow well

Booster Pumps

This kind of device enhances the liquid force and used for additional water discharge. These pumps are implemented with gases if not liquids, though, the construction will be different depending on the type of liquid that is used. The gas type booster pump comprises of a gas compressor that is used for the amplification of gas which is prevailingly more than ambient pressure.

Monoblock Pump Advantages/Disadvantages

The advantages and disadvantages are

• Easy installation and maintenance
• Minimal noise and fewer vibrations
• Easy replacement of pump devices
• Efficient functioning delivers enhanced performance
• Cost-effective

Applications

The few monoblock pump applications are:

• Used for domestic purposes
• Dewatering of coal fields and platforms
• Lifting and dripping applications

FAQs

1). What is the difference between a monoblock pump and the centrifugal pump?

Monoblock equipment is with pump and motor assemblage and is minimal n size whereas centrifugal pump equipment is huge.

2). What is the meaning of monoblock?

Mono corresponds to single and the name defines that the pump is strongly connected to a prime motor.

3). Which pumps are self-priming?

Pumps those have side-channel or water jet are termed as self-priming pumps

4). What is a self-priming monoblock pump?

It means the centrifugal pump that utilizes air-water composition to achieve a complete primed pumping range.

So, this is the article that has discussed the concepts of monoblock pump types, working principle, its applications, and advantages. As there are multiple types of these pumps, people can choose the specified one depending on their requirement and budget. With the above-discussed data, monoblocks are considered as the most crucial type. Know more on the concept of what are the other types of monoblock pumps and how they are operated?