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The brittleness of cast boilre makes it impractical for high-pressure steam boilers. Superheated steam boilers evaporate the water and then further heat the steam in a superheatercausing the discharged steam temperature to be substantially above the boiling temperature at the boiler’s operating pressure. Association of Water Technologies: All these factors make proper draught hard to attain and therefore make mechanical draught equipment much more reliable and economical.

One consideration is the introduction of feedwater to the boiler.

The AQC boiler with settling chamber

The pressure vessel of a boiler is usually made of steel boilwr alloy steelor historically of wrought iron. Views Read Edit View history.

At best, this increases energy costs and can lead to poor quality steam, reduced efficiency, shorter plant life and unreliable operation. High pressure, superheated steam can be extremely dangerous if it unintentionally escapes.

ISGEC | Waste Heat Recovery Boiler Manufacturers | PH boilers | AQC boilers

Electric steam boilers use resistance- or immersion-type heating elements. Balanced draught is obtained through use of both induced and forced draught. Thin and brittle metal shells can rupture, while poorly welded or riveted seams could open up, leading to a violent eruption of the pressurized steam.


To define and secure boilers safely, some professional specialized organizations such as the American Society of Mechanical Engineers ASME develop standards and regulation codes. The fluid does not necessarily boil. The induced draught fan works in conjunction with the forced draught fan allowing the furnace pressure to be maintained slightly below atmospheric. Boilers Chemical equipment Plumbing Heating, ventilating, and air conditioning.

The first is through use of a steam jet.

Forced draught furnaces usually have a positive pressure. Frost and Darryl R. Collapsed or dislodged boiler tubes can aq spray scalding-hot steam and smoke out of the air intake and firing chute, injuring the firemen who load the coal into the fire chamber.

AQC and PH Boiler

Historically, copper was often used for fireboxes particularly for steam locomotivesbecause of its better formability and higher thermal conductivity; however, in more recent times, the high price of copper often makes this an uneconomic choice and cheaper substitutes such as steel are used instead. A fuel -heated boiler must provide air to oxidize its fuel.

That makes the longevity of bouler wrought-iron boilers far superior to that of welded steel boilers. Mechanical forced draught is provided by means of a fan forcing air into the combustion chamber.


Almost all induced draught furnaces operate with a slightly negative pressure. Wikimedia Commons has media related to Boilers. The fluid at that point may be a mix of steam and liquid droplets as it passes into the condenser. The pump used to charge the boiler must be able to overcome the boiler’s operating pressure, else water will not flow.

Also, higher steam pressure will be possible than with saturated steam, enabling the steam to carry more energy.

Early boilers provided this stream of air, or draughtthrough the natural action of convection in a chimney connected to the exhaust of the combustion chamber. In all cases the combustion product waste gases are separate from the working fluid of the steam cycle, making these systems examples of External combustion engines. Low Pressure Boilers 4th ed.

Most modern boilers depend on mechanical draught rather than natural draught. When water is boiled the result is saturated steamalso referred to as “wet steam. As the resulting ” dry steam ” is much hotter than needed to stay in the vaporous state it will not contain any significant unevaporated water.

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