Q. If that is the case why not increase the pressure beyond
this and save more fuel?
A. Because we would soon pass the point of safety in a
boiler, and the result would be the loss of life and property.
Q. What do you consider a safe working pressure on a
boiler?
A. That depends entirely on its diameter. While a boiler of
30 inches in diameter 3/8 inch iron would carry I40 pounds, a
boiler of the same thickness 80 inches in diameter would have
a safe working pressure of only 50 pounds, which shows that
the safe working pressure decreases very rapidly as we increase
the diameter of boiler. This is the safe working pressure for
single riveted boilers of this diameter. To find the safe
working pressure of a double riveted boiler of same diameter
multiply the safe pressure of the single riveted by 70, and
divide by 56, will give a safe pressure of a double riveted
boiler.
Q. Why is a steel boiler superior to an iron boiler?
A. Because it is much lighter and stronger.
Q. Does boiler plate become stronger or weaker as it
becomes heated?
A.
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