From Steam Plant Operation, Eighth Edition

A boiler, which includes drums, tubes, flues, ducts, auxiliary equipment, and their associated supports, is subject to continual stress resulting from expansion and contraction and from elevated temperatures when it is in service. Boilers must be made adequately strong and with suitable materials to withstand these forces and temperatures. Boiler design requires a detailed study of the forces that are exerted on the various parts and of the temperatures to which they will be exposed. In addition, because of the corrosive properties of substances contained in fossil fuels and in water, attention must be given to the selection of the proper materials to ensure a high availability of the boiler system.

Pressure-vessel construction codes adopted by federal, state, and local jurisdictional authorities play an important part in determining safety requirements and thus the construction features of pressure vessels. The most widely used of these is the ASME Boiler and Pressure Vessel Code, published by the American Society of Mechanical Engineers. This code gives excellent guidance and basic requirements to the boiler designer.

This code sets rules of safety for the design, fabrication, and inspection of boilers, pressure vessels, and nuclear power plant components. The purpose of these rules is to assure that life, equipment, and property are safely protected during normal and abnormal service conditions. This requires a margin for safety for these service conditions, as well as the expected deterioration over the life of the plant.

3.1 Materials Used in Boiler Construction

When two forces of equal intensity...

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Products & Services
Boiler and Pressure Vessel (BPV) Services
Boiler services include repair, rebuilding, maintenance and installation of boilers. They may also provide cleaning, calibration, condition assessment, field inspection, failure analysis, and part replacement services.
Boilers (Industrial)
Industrial boilers are closed vessels that use a fuel source or electricity to heat water or generate steam for industrial heating and humidification applications.
Pressure Vessels
Pressure vessels are boilers and storage tanks that contain liquids or gases and are designed to operate at pressures above 15 psig.
Economizers
Economizers are mechanical devices that are designed to reduce energy consumption, or to perform other useful, energy-related functions (such as preheating fluids).
Rupture Discs and Burst Discs
Rupture discs and burst discs are designed to open and relieve overpressure, high temperature, or vacuum conditions at a predetermined differential pressure or specific temperature. They may be thermally or mechanically actuated.

Topics of Interest

Combustion is the rapid chemical combination of oxygen with the combustible elements of a fuel, resulting in the production of heat. Combustion is accomplished by mixing fuel and air at elevated...

History of the ASME Code On March 20, 1905, a disastrous boiler explosion occurred in a shoe factory in Brockton, Massachusetts, killing 58 persons, injuring 117 others, and causing a quarter of a...

The ASME Boiler and Pressure Vessel Code Section I, Power Boilers, includes rules and general requirements for all methods of construction of power, electric, and miniature boilers and...

11.1 DEFINITION Aboiler is a vessel in which water is continuously vaporized into steam by the application of heat. The steam that the boiler produces can be used for power generating, water heating...

Out of concern for public safety, most legal jurisdictions now require unfired pressure vessel construction to comply with the ASME Boiler and Pressure Vessek Code. Because the present two divisions...