LaMont Boiler: Definition, Parts, working, Application, Advantages, Disadvantages

Want to know about LaMont Boiler?

Then, you landed in the right place, Here, you will get a complete knowledge of Lamont Boiler, From start to end.

So, come with me and feel comfortable while I start the engine of this knowledgeable journey with you.

Before I start, here is a gift for you, you can download this whole article as a Lamont boiler pdf and Lamont boiler ppt format at the end of this article.

So, shall I start?

If so, here I go…

LaMont Boiler Definition-

Lamont boiler is high pressure, forced circulation, water tube boiler with an internally fired furnace.

A forced circulation boiler was introduced by La-Mont in the year of 1925 which is used in Europe and America and this boiler was invented to use in ships.

Working Principle of LaMont Boiler-

This modern high-pressure LaMont boiler works on the principle of forced circulation system and the Lamont boiler is a water tube steam boiler working on forced circulation.

In which the boiler water is circulated through an external pump through long closely spaced tubes of small diameter.

The mechanical pump is employed in order to have adequate and positive circulation in steam and hot water boilers.

Here is the systematic and simple diagram of this boiler.

Lamont boiler diagram-lamont boiler diagram

Parts and Construction-

There are several parts used in this boiler. Here are its parts or Boiler’s Mounting and Accessories and construction of the Lamont boiler given below-

  • Feed Pump
  • Economizer
  • Air Pre-Heater
  • Steam Outlet
  • Steam Separating Drum
  • Circulating Pump
  • Radiant Evaporator
  • Convective Evaporator
  • Superheater

1. Feed Pump-

The feed pump is used to provide feed water to the boiler.

2. Economizer- 

An economizer is a device used to preheat the feed water using the hot gases leaving the boiler.

Before the gases are let off to the atmosphere, they are made to flow in a definite passage in the economizer so that some of the heat in the hot gases, which otherwise gets wasted, can be used to preheat the feed water.

The preheated water requires only a small amount of heat to be supplied in the boiler, resulting in some shaving of the fuel.

3. Air Pre-Heater-

Since the heat of the exit gases can not be fully extracted through the economizer, the air preheater is employed to recover some of the heat escaping from these gases.

These exit gases preheat the air from the blower in the air pre-heater.

The preheated air is supplied to the furnace for combustion.

4. Steam Outlet-

Superheated steam from the superheater passes out to the steam turbine through the steam outlet.

5. Steam Separating Drum-

The LaMont boiler consists of a steam separator drum which is placed wholly outside the boiler setting.

The drum receives a mixture of steam and water from the evaporator tubes and feeds water from the economizer.

The steam is separated from the water in the drum.

6. Circulating Pump-

The water from the drum is then drawn to the circulating pump, also known as the Centrifugal pump through the downcomer.

The pump circulates water(forced circulation) equal to 8 to 10 times the weight of steam evaporated.

This prevents the tubes from being overheated.

7. Radiant Evaporator-

A radiant evaporator is used to raise more temperature of the water.

8. Convective Evaporator-

A convective evaporator is usually used to transfer heat from steam to water to provide more heat to the water.

9. SuperHeater-

The presence of moisture in it will cause corrosion of turbine blades and to raise the temperature of the steam and thereby to increase the turbine efficiency, superHeater is used.

Are you there?

If so, Now let’s move to the Working of this boiler.

Working of LaMont Boiler-

Here is the step-by-step guide to Lamont boiler working

The feedwater passes through the economizer to the separation drum from which it is drawn by the circulating pump.

The function of the economizer is to increase the temperature of the feedwater by absorbing the heat from the flue gases before they are sent to the atmosphere.

The centrifugal pump delivers the feed water to the evaporating section or the radiant evaporator which in turn sends a mixture of the steam and water to the drum.

The steam generated by the radiant evaporator is the saturated steam. If it is directly used in the steam turbine, it can cause the blades to corrode.

So the saturated steam sends to the superheater where it can increase the temperature of the steam.

The working pressure, temperature and capacity of the Lamont boiler are 170bar, 773K and 50tones/h respectively.

Thus, this was the systematic construction and working of the Lamont boiler.

Are you enjoying it?

If so, Now I am heading you to the Lamont boiler advantages and disadvantages and its application.

So, here we go…

Advantages of Lamont Boiler-

Here are the main advantages of this boiler-

  • High steam generation boiler
  • Higher heat transfer rate boiler
  • Easily start
  • Reassemble in natural circulation
  • Flexible design


Here are the main disadvantages of this boiler-

  • The deposition of salt and sediments on the inner surface of the water tubes reduces the heat transfer rate.
  • There is also the formation of bubbling at the inner surface of the water tube and it leads to an increase in the heat flow resistance.


Here is the main application of this boiler-



This was a simple and clear explanation of the Lamont boiler, covering multiple topics like definition, principle, construction, working and other section of advantages and disadvantages along with its application.

I hope you liked spending time here and gain some valuable pieces of knowledge in return and it added some value to you in the further run. If so, consider sharing with your friends and colleagues or needy ones and help to spread good knowledge out there. Although Sharing is caring, you know!!

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 Want to read more? Here are some suggested topics you should consider-

Benson Boiler

Difference between Lamont Boiler and Benson Boiler

Velox Boiler

What’s the Difference between condenser and Evaporator?

Electron Beam Machining (EBM): Definition, Principle, Diagram, Advantages

Thank you for being with me. I hope to see you in the next session.


Here is your gift, which I promise to give at the end of the article. So, here it is-

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Before you go, Here are some FAQs regarding this boiler, you should consider looking at a glance.


Where LaMont boiler is used?

LaMont boiler is basically used in Thermal power plants.

Which boiler is the most successful boiler in the gas turbine industry?

Velox boiler

What is the pH value of water permissible for the boiler?

The permissible water pH value for boilers is 8.5pH.

What is the pH of steam?

The pH of steam ranges from 7 to 9.

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