BOILER DESIGN FOR CONSTRUCTION OF BOILERS The rules of boiler design are controlled by practical considerations and theory, and are learned by the designer by practice only. The rules vary from place to place, and from time to time, due to progress in engineering.
The rules, methods and cautions taken up here are general, and with necessary modifications can be applied to all the more common types.
In designing a steam boiler there are several considerations that must be kept in mind. Among the most important are strength, durability, capacity to furnish the required amount of steam, convenience for cleaning, repairing and inspection, simplicity in detail, and economy both of running and first cost.
The kind, or type, to be used depends upon the work to be done, the dryness of the steam, the locality,. the available space and preference of the owner. The work to be done is determined by the number and kind of engines, the constancy with which they run and the pressure. In choosing a boiler for any locality, the purity of the water, the kind of fuel and the laws which govern inspection and allowable working stress must be considered. The available space greatly influences the type and sometimes prevents choice. For instance, locomotive and marine boilers must be put in a small space. For land boilers if the floor area is limited, but there is ample height, some type of vertical boiler must be chosen.