Q. To what class does the farm or traction engine belong?
A. To the internally fired.
Q. How would you find the H.P. of such a boiler?
A. Multiply in inches the circumference or square of
furnace, by its length, then multiply, the circumference of one
tube by its total length, and this product by the number of
tubes also taking into account the surface in tube sheet, add
these products together and divide by I44, this will give you
the number of square feet of heating surface in boiler. Divide
this by 14 or 15 which will give the H.P. of boiler.
Q. Why do you say 14 or 15?
A. Because some claim that it requires 14 feet of heating
surface to the H.P. and others 15.
To give you my personal opinion I believe that any of the
standard engines today with good coal and properly handled,
will and are producing 1 H.P. for as low as every 10 feet of
surface. But to be on the safe side it is well to divide by 15 to
get the H.P. of your boiler, when good and bad fuel is
considered.
Q. How would you find the approximate weight of a boiler
by measurement?
A.
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