holes in bed
fire bed level. | and admitting excess air.
|
6. Do not allow clinkers to form | Because they reduce the effective
on side or bridge walls. | area of the grate.
|
7. Keep the ash pit free from ashes | To prevent warping and burning out
and hot clinkers. | of the grates.
|
8. Do not stir the fire except when | Because stirring causes clinker
necessary. | and is likely to waste coal.
|
9. Use damper and not ash-pit doors | Because less excess air is
to control draft. | admitted by so doing.
|
10. See that steam pipes and valves | Because steam leaks waste heat
are tight. | and therefore coal.
|
11. Keep blow-off valves tight. | Because leaks of hot water waste
| coal.
|
12. Cover steam pipes and the tops | To prevent radiation and loss of
of boilers. | heat.

Make a boiler test under the conditions of operation as they now
exist in your plant. Then make all possible improvements as
suggested in this bulletin, make another test afterwards and note
the increase in the equivalent evaporation per pound of coal used.

Remember that the _firing line_ in the boiler room can be just as
patriotic and helpful as the _firing line_ at the front.

_Table of factors of evaporation._

============================================================================
Feed | Steam pressure in pounds per square inch, gauge.
temperature,|---------------------------------------------------------------
deg.F. | 30 | 50 | 70 | 80 | 90 | 100 | 110 | 120
------------+-------+-------+-------+-------+-------+-------+-------+-------
32 | 1.2073| 1.2144| 1.2195| 1.2216| 1.2234| 1.2251| 1.2266| 1.2279
35 | 1.2042| 1.2113| 1.2164| 1.2184| 1.2203| 1.2219| 1.2235| 1.2248
38 | 1.2011| 1.2082| 1.2133| 1.2153| 1.2172| 1.2188| 1.2204| 1.2217
41 | 1.1980| 1.2051| 1.2102| 1.2122| 1.2141| 1.2157| 1.2173| 1.2186
44 | 1.1949| 1.2020| 1.2071| 1.2091| 1.2110|