Q. Which do you consider the most available?
A. The tubular boiler.
Q. Why?
A. It is more economical and is less liable to "collapse?"
Q. What do you mean by "collapse?"
A. It is a crushing in of a flue by external pressure.
Q. Is a tube of a large diameter more liable to collapse than
one of small diameter?
A. Yes.
Q. Why?
A. Because its power of resistance is much less than a tube
of small diameter.
Q. Is the pressure on the shell of a boiler the same as on the
tubes?
A. No.
Q. What is the difference?
A. The shell of boiler has a tearing or internal pressure
while the tubes have a crushing or external pressure.
Q. What causes an explosion?
A. An explosion occurs generally from low water, allowing
the iron to become overheated and thereby weakened and
unable to withstand the pressure.
Q. What is a "burst?"
A. It is that which occurs when through any defect the water
and steam are allowed to escape freely without further injury
to boiler.
Q. What is the best way to prevent an explosion or burst?
A. (I) Never go beyond a safe working pressure.
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