seal between the refractory surface and the tube sheet.
The insulating pulp seal is not needed or used on the front
head. Make sure the gaskets are in position when closing.
When you are closing the door, bolts should be
snug and tightened evenly to avoid cocking the door
and damaging the gasket. Start tightening at the top
center bolt and alternate between the top center bolt
and the bottom center bolt until both are drawn-up
tight. Do not overtighten. Continue the tightening
sequence along top and bottom, tightening the bolts
alternately until the door is secured and gas-tight. After
the boiler is back in operation, retighten the bolts to
compensate for any expansion.
When plastic firebrick is used, troweling the new
section of refactory will cause what condition to
occur during the baking-out process?
What temperatures are required to bake out
Leakage of combustion gases, loss of heat, and
loss of operating efficiency can be caused by
Learning Objective: Recognize different boiler
checks, start-up, securing procedures, and boiler
emergencies. Understand the purpose and types of data
in boiler operating logs.
Proper sealing of the doors is essential to
avoid leakage of combustion gases and
loss of heat and operating efficiency.
The operation of a boiler consists of seven major
phases: (1) prewatch assumption checks, (2)
preoperating checks, (3) lining up systems, (4)
operating procedures, (5) operating checks, (6)
securing procedures, and (7) boiler emergencies.
The prewatch assumption checks are often
neglected by boiler watch standers. Before you assume
the responsibility of a boiler watch stander, you must
complete specified checking procedures to ensure that
the equipment in service is in sound operating
condition and is functioning satisfactorily. When the
watch is relieved, the watch stander coming on duty
inspects the instrument readings and charts, visually
inspects all equipment, and exchanges information
with offgoing watch standers. Oncoming watch
standers should complete the following inspections
and tests before assuming duty:
Visually inspect the setting and casting.
Observe the furnace and firing conditions.
Inspect the charts, logs, controls, and so forth, on
equipment performance during previous watch.
Inspect the fans, dampers, damper drives, and
other driven auxiliaries.
Test the water columns and gauge glasses.
Obtain information from the watch standers on
duty on the boiler operating condition and any
unusual event or trouble that occurred during the
Immediately after accepting the operational
responsibility, you should make a complete inspection
of all auxiliary equipment as follows:
Inspect all electric motor drives for abnormal
temperature, condition of bearings, and so forth.
Inspect the fan and pump bearings for
overheating and adequacy of lubrication.
Visually inspect the boiler and all associated
equipment, listen for unusual sounds, friction,
vibration, and other abnormal conditions.
Inspect the burners, fuel supply, pilot systems,
and other fuel supply components.
Review the log sheets to obtain information on
past operating conditions and unusual events.
The preoperating checks should be completed
before lining up and lighting off a boiler. These checks
are performed to ensure that the plant and associated
equipment are in a safe and efficient operable
condition. The major preoperating procedures
applicable to boilers in general, as well as additional
procedures for gas-fired and oil-fired boilers are
shown in tables B, C, and D, appendix II.
LINING UP SYSTEMS
After you have completed the preoperating
checks, your next job is to line up the boiler systems.
The procedure used in lining up boiler systems (fuel,