Unlock Benson Boiler 5 Parts, Construction, Working, Advantages, Disadvantages, Application [PDF]

In this article, we will study the Parts, Construction, Working, Advantages, Disadvantages, and Application of the Benson Boiler. We have also provided a PDF for the same. Benson Boiler is a water tube boiler. This is a drum-less and high-pressure boiler.

Benson Boiler Parts
Photo By Engineering Choice

Benson Boiler Construction or Parts

The Main Parts of Benson Boiler are as follows

  • Economizer
  • Radiant Evaporation
  • Convection Evaporation
  • Steam Outlet
  • Capacity

This boiler has a unique characteristic of an absence of steam separating the drum. The entire process of heating, steam generation, and superheating is done in a single continuous tube.


The feed water by means of the feed pump is circulated through the economizer tubes. Hot flue gases pass over the economizer tubes and the feed water is preheated.

Radiant evaporator

The feed water from the economizer flows into the radiant evaporator with radiant parallel tube sections. The radiant evaporator receives heat from the burning fuel through the radiation process and the majority of water is converted into steam in it.

Benson Boiler
Benson Boiler

Convection Evaporator

The remaining water is evaporated in the convection evaporator, absorbing the heat from the hot gases by convection. Thus the saturated high-pressure steam at a pressure of 210 kg/sq.cm is produced.

Convection Superheater

The saturated steam is now passed through the convection superheater where the saturated steam is superheated to 650’C. The radiant evaporator, the convection evaporator, and the convection superheater are all arranged in the path of the flue gases.

Steam outlet

The superheated steam is supplied to the steam turbine through the steam outlet.


The capacity of the Benson boiler is about 150 tonnes/hr. at a pressure of 210 (kg force per square centimeter). and at a temperature of 650ºC.

Benson Boiler Working

It works on the pressure of the water which is increased to the supercritical pressure (i.e. above the critical pressure of 225 bar). When the pressure of water is increased to the supercritical level, the latent heat of water becomes zero and due to this, it directly changes into steam without boiling. And this prevents the formation of bubbles at the tube surface.

Benson Boiler Working
Photo by IQ Mech

In Benson Boiler, the feed pump increases the pressure of the water to the supercritical pressure and then it enters into the economizer. From an economizer, the water passes to the radiant heater. Here the water receives the heat through radiation and partly gets
converted into steam.

The temperature raises almost to the supercritical temperature. After that mixture of steam and water enters into the convective evaporator where it is completely converted into steam and may superheat to some degree. Finally, it is passed through the superheater to obtain the desired superheated steam. This superheated steam is then used by turbines or engines to produce electricity.

Benson Boiler Advantages

  • It is lightweight and it has no drum. For this reason, it is lighter than other boilers.
  • It starting time is less than other boiler
  • It has up to 90 percent thermal efficiency.

Benson Boiler Disadvantages

  • Due to supercritical types of boilers, their controller needs to monitor every time for preventing an explosion.
  • Boiler control for the variable load is difficult.

Benson Boiler Application

  • This supercritical boiler is used in different industries to generate steam for the production of electricity or mechanical power.
  • The average operating pressure, temperature, and capacity of the Benson boiler is 650 degree Celsius, 250 bar, and 135 tonnes/h.

Benson Boiler Features

  • In the Benson boiler, there are no drums, so the total weight of the Benson boiler is 20% less than the other boilers. which reduces the cost of the boilers.
  • Because no drums are used in this boiler, the transfer of the Benson boiler parts is easy. chances of all the parts may be carried to the site, without pre-assembly.
  • It is a once-through boiler and the feedwater entering at one end is discharged as superheated steam at the other end.


What Is Benson Boiler?

It is a water tube boiler.

What Are The Different Types Of Water Tube Boiler?

The water tube boiler are as follows

What Are The Advantages Of This Boiler?

  • It is lightweight and it has no drum. For this reason, it is lighter than another boiler.
  • Its starting time is less than other boiler and
  • It has up to 90 percent thermal efficiency.


In conclusion, the Benson boiler is a type of high-pressure, water-tube boiler that is commonly used in power plants to generate steam. Its unique design allows for a high level of efficiency and reliability, making it a popular choice for large-scale industrial applications. However, it requires careful maintenance and operation to ensure safe and efficient operation. With proper care, the Benson boiler can provide many years of reliable service and play a critical role in meeting our energy needs.


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2 thoughts on “Unlock Benson Boiler 5 Parts, Construction, Working, Advantages, Disadvantages, Application [PDF]”

    • Thank you for your feedback. I’d like to understand more about what you find misleading in the “Benson boiler working” picture. Could you please provide specific details so we can address your concerns accurately?


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