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QUESTION:There are at least two different types of fuel-fired boiler used in
industry:
In the first, the flame is confined inside tubes, and the liquid
being boiled circulates around the tubes inside the boiler shell.
Q: I believe that the first one is called a "fire-tube" design.
Please confirm.
In the other, the flame is outside the tubes, and the liquid being
boiled is contained inside the tubes.
Q: I can't remember the name of the second type, in English. Can
somebody help?
In a Spanish->English translation I'm working on, one of these is
referred to as "ignetubular" which I believe is the "fire-tube"
type, while the second is called "piritubular"
ANSWER: Correct -- (sometimes the word is not hyphenated -- "firetube")
These are small boilers for industrial plants where saturated steam
demand is less than about 50,000 lb/h and pressure requirements are less
than 250 psig. They're called watertube (or water-tube) boilers. These are large,
high-pressure, high-capacity boilers used by generating stations. Their
capacities are as high as 9,000,000 lb/h and operating pressures can be
higher than 3,800 psig.
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