This method should not be used on a boiler with
a superheater or reheater.
b. By measuring the maximum amount of
fuel that can be burned and computing the
corresponding evaporative capacity (steam-
generating capacity) upon the basis of the heating
value of this fuel. These computations should be
made as outlined in the code.
c. By determining the maximum evapora-
tive capacity by measuring the feedwater.
When either of the methods outlined in
(b) or (c) above is employed, the sum of the safety
valve capacity should be equal to, or greater than,
the maximum evaporative capacity (maximum
steam-generating capacity) of the boiler.
If you discover that the relieving
capacity is inadequate because of deficiencies in
the valve, the valve should be repaired or replaced.
If the relieving capacity of the valve is found to
be satisfactory within the proper relieving range
of the valve but inefficient for the steam-
generating capacity of the boiler, additional safety
valve capacity should be provided.
4. PRESSURE-RELIEF VALVECAPAC-
ITY TEST. When the relieving capacity of any
pressure-relief valve for hot-water boilers is
questioned, the capacity can be tested by turning
the adjustment screw until the pressure-relief valve
is adjusted to the fully open position. The pressure
should not rise excessively. When the test is
completed, reset the pressure-relief valve to the
required setting. This test is made with all water
discharge openings closed except the pressure-
relief valve being tested. When the discharge is
led through a pipe, determine at the time the valve
is operating if the drain opening in the discharge
pipe is not properly free, or if there is evidence
of obstruction elsewhere inside the pipe. If deemed
necessary to determine the freedom of discharge
from the valve, the discharge connection should
be removed. After completing tests and adjust-
ments, the inspector should seal the safety adjust-
ment to prevent tampering.
should be discouraged. The maximum use of
steam-driven auxiliaries short of atmospheric
exhaust should be encouraged. Steam leaks,
wastage to atmosphere, and so forth, should be
called to the attention of operating personnel.
Particular attention should be given to deaerator
venting practice. Venting should be held to the
minimum required to preclude oxygen entrain-
ment in the feedwater.
When intermittently operating condensate
pumps are used, look for any tendency toward
creation of a vacuum when a pump starts. If this
happens, recommend installation of a small,
continuously operating, float-throttled, conden-
sate pump (in parallel with intermittently
operating pumps) to assure a condensate flow at
all times. If there are a number of intermittently
operating condensate pumps, it may be possible
to convert one of them (if of small enough
capacity) to continuous throttled operation.
To operate boilers or be a plant supervisor,
you need to know all the mechanical details of
the boiler you are operating and its associated
auxiliaries. However, just knowing this informa-
tion is not enough. To be a professional boiler
operator or plant supervisor, you must develop
a keen eye for trouble, a finely tuned ear, and an
overall sense of awareness concerning boiler plant
operation at all times.
As an operator and/or supervisor of a boiler
plant, you must learn to tell the difference
between normal and abnormal operating condi-
tions. By training yourself to notice and analyze
strange noises, unusual vibrations, abnormal
temperatures and pressures, and other indications
of trouble, you will be better able to prevent any
impending trouble or casualty to the plant.
While the boiler is operating under normal
conditions, observe the operation of all boiler
auxiliaries for any defects that may prevent
proper functioning of the boiler or indicate a lack
of proper maintenance of auxiliary equipment.
The unnecessary use of multiple auxiliaries or the
use of a large auxiliary during a light-load period
(when a smaller auxiliary could be substituted)
Boiler plant operators must maintain accurate
records. Logs provide a means of recording con-
tinuous data on boiler plant performance and
analysis of operation. Logs are arranged for use
over a 24-hour period, consisting of three 8-hour
shifts. Log entries should be carefully made in