High Pressure Boiler : Powertherm Model

High pressure boilers (Powertherm) are mostly water tube boilers in which water is on the tube side while flue gases flow across the tubes thereby transferring heat from flue gases to water using cross flow heat transfer.

Capacity: 8 TPM to 30TPM

Pressure: Upto 45 kg/cm2

Fuel: Solid

Design: Water Tube (Single Drum / Bi-Drum)

High Pressure Boiler : Powertherm Model

Before converting to steam, water circulates multiple times from shell (water drum) to water tubes and then back to shell. During the circulation, the temperature of water increases as it comes in indirect contact with flue gases that transfer heat through tubes.

Water circulation continues until it’s vapor pressure exceeds the vapor pressure of steam at the top of the drum. At this pressure, water gets converted to saturated steam.

Overall, Circulation Ratio is an important factor in designing of water tube boilers. Based on circulation there are 2 basic designs of water tube boilers: Natural Circulation Boilers and Forced Circulation Boilers

Natural Circulation Boilers are the type of boilers where water circulates naturally that is due to the density difference. The difference in density is created with the difference in temperature of cold and hot water. Circulation ratio is an important factor in designing of natural circulation boilers so as to prevent the overheating or bursting of tubes.


  • The heat of combustion is used to lots of efficiently by the use of small diameter tubes in big numbers.

  • To avoid big resistance to the flow of water, Powertherm boilers have a parallel set of an arrangement of tubes.

  • The Steam boiler parts are usually organized horizontally, giving larger accessibility and operational convenience.

  • All the elements are uniformly heated, so the danger of warming is reduced. besides thermal stress drawback is avoided.

  • The tendency of scale formation is eliminated thanks to the high speed of water through the boiler tubes.

High Pressure Boiler : Powertherm capacity

High Pressure Boilers (Powertherm) are available in capacities from 10 TPH to 25 TPH.

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